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Electronic Design V18 N25 19701206

FOR ENGINEERS AND ENGINEERING MANAGERS

DEC. 6, 1970

Extract signals from noise with a simple, inexpensive voltage correlator. Costing as little as $100, the circuit rejects noise, har~onics and qpadrature com-

pone ts on input signals. With additional circuitry, the correlator measures phase-shift or becomes a complete spectrum analyzer. For the full details, see p. 66.

%customer ction rate!

Less than 1% customer rejection for all causes. That's the record established by Dale T-Pots. Consider the savings this can bring you in time, paper work. Then consider the added efficiency of consolidating more of your buys at this versatile source. Almost 50% more models added in two years. Military (RT-10, 11, 12, 22, 24), Industrial, Commercial ... wirewound and film elements. All are very competitively priced. Check today and find out. We can deliver them quickly-and you won't have to send them back.
MILITARY GRADE T-POTS
600 Serles: Mil. Equiv. RT-10 ; 10n to 1OOKn, ::!:5%; 1 watt at 70°C, derated to 0 at 175°C; .18 H x .32 W x 1.00 L.
1200 Serles: Mil. Equiv. RT-11 ; 1on to 1OOKn, ::!:5%; 1 watt at 70°C. derated to Oat 175°C; .28 H x .31Wx1 .25 L.
1600 Series: Mil. Equiv. RT-12 ; 10n to 1OOKn. ::!:5%; 1 watt at 7rtC. derated
w too at 1is0 c; .19 H x .32 x 1.25 L.
5000 Serles: Mil. Equiv. RT-22 ; 1on to 50Kn. ::!:5%; 1 watt at 70°C, derated to Oat 175°C; .19 or .22 H x .50 W x .50 L.
5800 Serles: Mil. Equiv. RT-24; 1on to SOKn. ::!:5%; 1 watt at 70°C, derated to O at 175°C; .145 or .150 H x .375 W x .375 L.

COMMERCIAL GRADE ECONO-TRIM T-POTS

WIREWOUND ELEMENT

2300 Series: Sealed/Unsealed; 1On to 50Kn. ::!:10%; 0.5 watt at

25°C, derated to 0 at 105°C;· .36 H x .28 W x 1.00 L.

,,.~ ~

2400 Serles: Sealed/Unsealed; 10n to 50Kn, ::!:10%; 1 watt at 4rtC. derated to 0 at 125°C; .31 H x .16 W x .75 L.
FILM ELEMENT
8300 Series: Sealed/Unsealed; 10n to 2 Meg .· ::!:10% 1oon thru SOOK, ::!:20% all other values; .75 watt at 25°C, derated to O

w at 1os0 c; .36 H x .28 x 1.00 L.

1'L'

8400 Serles: Sealed/Unsealed ; 1on to 2 Meg.. ::!:1 0% 1OOn thru SOOK, ::!:20% all other values ; .75 watt at 25°C, derated to O at 125°C; .31 H x .16 W x .75 L.

INDUSTRIAL GRADE T-POTS

WIREWOUND ELEMENT
100, 200, 300 Serles:10n to 100Kn. 100 Series: ::!:5%; 0.8 watt at 7rtC. derated to Oat 135°C. 200 Series: ::!:10%; 0.5 watt at 700C , derated to O at 105°C. 300 Series . ::!:15%; .25 watt at 70°C, derated to O at 85°C. Dimensions: .22 H x .31Wx1.25 L (also 1.32 L for 100, 200).
1100 Serles:10n to 100Kn. ::!:10%; 1 watt at 70°C, derated to 0 at 175°C; 28 H x .31Wx1 .25 L.

Call 402-564-3131 for complete information or write for Catalog B

DALE ELECTRONICS, INC., 1328 28th Ave., Columbus, Nebraska 68601
In Canada, Dale Electronics Canada . Ltd . · A subs1d1ary of The Lio nel Corporation INFORMATION RETRIEVAL NUMBER 181

seeo111 rlflf,1 m
VSMF
llllV· LS I A ll ( M M IC · o·nM··l l

These are the solid-state displays you'll be hearing about.
Starting now!

HP's new solid-state monolithic numeric indicators are ready for you right now. They give solid-state reliability and long operating life to your information display. Their small size (5 digits in 0.750 inch width), low power requirements (200 fL at 5mA per segment) and low cost ($7.05 / digit in 1 K quantities) open up many new applications in the display of numeric data.

All characters are brilliant, easy-to-use, 7-segment figures, available in a standard DIP or flat-pack package. And lead connections are truly minimal - only 13 connections for 5 characters.
For more information on these 5082-7200 series of displays as well as our other numerics, alphanumerics and LED's, call your local HP field engineer. Or write: Hewlett-Packard, Palo Alto, California 94304; Europe: 1217 Meyrin-Geneva, Switzerland.

HEWLETT~ PACKARD
COMPONENTS

this latest addition to the Allen-Bradley line of cermet trimmers ... the type Z ... affords high performance in an especially compact package

The cermet material - an exclusive formulation developed by Allen-Bradley - provides superior load life, operating life, and electrical performance.
For example, the full load operation (Yi watt) for 1000 hours at 70°C
produces less than 3% total resistance change. And the temperature coefficient
+ is less than +250 PPM/°C for all resistance values and throughout the
complete temperature range (- 55°C to 125°C).
The Type Z is ruggedly constructed to withstand shock and vibration. The unique rotor design ensures smooth adjustment and complete stability under severe environments. The leads are permanently anchored and bonded. The connection exceeds the lead strength - opens cannot occur. Leads are weldable.
The enclosure is SEALED. It is both dust-tight as well as watertight and can be potted. Mounting pads prevent moisture migration and also postsolder washout. You can get immediate delivery at factory prices from your authorized A-B industrial electronics distributor. Or write: Marketing Dept., Electronics Div., Allen-Bradley Co., 1201 S. Second St., Milwaukee, Wis. 53204. Export Office: 1293 Broad St., Bloomfield, N. ]., U. S. A. 07003. In Canada: Allen-Bradley Canada Limited.

t-1/400- j
llE
SPECIFICATIONS SUMMARY Adjustment: Horizontal or vertical. Temperature Range: -55°C to +125°C. Resistances: 50 ohms through 1 megohm.
Lower resistances available. Tplerances: ±20% standard, ±10% available. Resolution: Essentially infinite. Rotational Life: Less than 2% total resistance
change after 200 cycles. Rotation: 300° single turn. End Resistance: Less than 3 ohms.

Electronic Design i5

NEWS
7 Letters 21 News Scope 25 Surface-wave devices offer cheap signal processing 30 Phase locked loops plus ICs-and, presto, better circuitr}'.! 36 Electronics to play by-tricky circuitry for toys 42 Technology Abroad 45 Washington Report

TECHNOLOGY
66 Separate the signals from the noise with this simple voltage correlator circuit. It costs only $100 in parts-yet analyzes complex signals.
70 Compute lead-lag network response. This BASIC program gives precise results for a general feedback integrator-differentiator.
74 Use this tan-lock demodulator to get wide-range linear performance
with no threshold or sideband problems.
.78 Solve interference problems painlessly. Many noise sources can be eliminated with these design hints and nomographs.
.86 Puzzled by management responsibilities? This refresher outlines your duties and guides you in techniques to lessen tensions.
92 Ideas for Design
104 Product Source Directory: Digital Panel Meters

PRODUCTS

117 ICs & 'Semiconductors: Hybrid op amp needs only 0.01 pA of bias current.

132 Components: Six-position switch comes in a dual-in-line package.

148 Instrumentation: Inexpensive 15-MHz counter kit costs just $200.

122 Microwaves & Lasers

153 Packaging & Materials

138 Modules & Subassemblies

154 Tools & Engineering Aids

152 Data Processing

172 Product Index

Departments

65 Editorial: Air-pollution market? Caution required!

13 Designer's Calendar

160 New Literature

156 Evaluation Samples

167 Bulletin Board

158 Design Aids

170 Advertisers' Index

159 Application Notes

Information Retrieval Service Card inside back cover

Cover: Designed by Art Director Cliff Gardiner. Photo, courtesy of Dubner Computer Systems, Inc., New York City.

ELECTRONIC DESIGN is published biweekly by Hayden Publlshin11 Company, Inc., 850 Third Avenue, New York,
1 N.Y. 10022. James S. Mulholland, Jr. President. Printed at Brown Prlnt1n1 Co:.i Inc., Waseca, Minn. Controlled
circulation postage paid at Waseca, M nn., and N- York, N.Y. Copyrillht C 1910, Hayden Publlshln11 Company, Inc. 82,501 copies this Issue.

... INFORMATION RETRIEVAL NUMBER 3

Now there's
abetterwa~
Our new DOS brings batch processing costs down to $765 a month.
If you've been hanging on to old-fashioned ways because you thought a computer was too expensive, think again. Our new Disc Operating System brings the cost of computation and general purpose processing right down to where your budget lives. With our new DOS, you'll easily create, check out and run your own programs. Use it for scientific calculations, business-accounting functions, information retrieval, inventory control, school administration - in fact, problemsolving of all kinds. Anyone who can poke a typewriter key or pencil-mark a card can use our DOS. Because the assembly (or compilation), loading and execution of your programs are under the control of a teleprinter keyboard or batch input device. On the other hand, if you're already batch processing with another system, give this a thought. Our DOS can probably do everything you're doing now for about half the cost. Because both the software and the hardware are fully modular, our DOS accommodates the needs of many different applications. Lets you vary the number of input/ output devices. Add more core memory. Use a card. reader as well as teleprinter. Add a line printer, paper tape punch, photo reader and magnetic tape. Other advantages include software protection and program segmentation. Plus automatic program retention so your programs can be easily reused . Our basic DOS includes an 8K computer with direct memory access, 2. 4 million-charatter disc, one teleprinter and one high-speed paper tape reader. Price is just $35,600. Or $765 per month on a five- year lease. And it's upward expandable for your future needs. Get the full story by calling your local HP computer specialist. Or write Hewlett-Packard, Palo Alto, California 94304; Europe: 121 7 Meyrin-Geneva, Switzerland.
HEWLETT. PACKARD
DIGITAL COMPUTERS
INFORMATION RETRIEVAL NUMBER 4

Publisher
Hugh R. Roome

Editors
New York Office 850 Third Ave. New York, N.Y., 10022 (212) 751·5530

225 CURRENT SOURCE
·FINE

Editor: Frank Egan Managing Editor: Ralph Dobriner Managing Editor: Raymond D. Speer Microelectronics, Steven A. Erenburg Computers, Milton J. Lowenstein Microwaves, Michael J. Riezenman Management, Richard L. Turmail News, John N. Kessler Military-Aerospace, John F. Mason New Products, Roger Allan New Products, Lucinda Mattera Copy, Marion Allen

VOLTAGE

OUTPUT

~ COMPLtANCEl !SELECTOR

·LIMrT
ON

STANDBY

· · .. ..

11·

I
FILTER
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OUT
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KEf'T'HLl:!:V INS'T"RUMENTS

Field Editors
Massachusetts Jim McDermott P.O. Box 272 Easthampton, Mass. 01027 (413) 527-3632
San Francisco Elizabeth de Atley Suite 6, 95 Main St. Los Altos, Calif. 94022 (415) 941-3087

NE\N \NAY TO GET A HANDLE ON CONSTANT CURRENT
0.1 AMPERE TO 1 NANOAMPERE

Now you can keep tight rein on low level currents for materials research, semiconductor testing and for other areas in science and industry where a reliable current source is needed. The Keithley 225 delivers from 0.1 A to 100 nA full scale with 0.02 % resolution on most ranges. It keeps them on target with 0.02% stability and low 0.01 % rms noise. Variably selectable compliance voltages from 10 to 100 volts and 0.005 % load regulation wrap-up this neat source for really constant currents.
Consider convenience features

like bipolar output, the ability to float 500 volts off ground, an output filter to deal with inductive loads. And, protection from overloads with automatic recovery. Now-can you afford to pass up such capability when it's yours for only $595?
For technical literature and demonstration, contact your Keithley Sales Engineer. Or, Keithley Instruments, Inc., 28775 Aurora Road, Cleveland, Ohio 44139. Telephone: (216) 248-0400. In Europe : 14 Ave. Villardin, 1009 Pully, Suisse. Prices slightly higher outside the U.S.A.

Los Angeles David Kaye 2930 Imperial Highway Inglewood, Calif. 90303 (213) 757-0183
Washington Don Byrne 1425 N St. NW Washington , D.C. 20005 (202) 667-6568
Editorial Production
Dollie S. Viebig Richard D. Grissom
Art
Art Director, Clifford M. Gardiner Assistant, William Kelly Rita Jendrzejewski
Production
Manager, Thomas V. Sedita Helen De Polo Kathleen Mcconkey Leslie Stein
Circulation
Manager, Nancy L. Merritt

KEIT:r1LE-Y
INFORMATION RETRIEVAL NUMBER 5
6

Information Retrieval
Peggy Long
ELECTRONIC DESIGN 25, December 6. 1970

letters
We are playing a global ball game
Regarding the article, "How Do We Compete with 'Japan, Inc.'?" in the Sept. 13, 1970 issue (E D 19, p. 100) the basic difference between Japan and the U . S. A. seems to be that the former has found a way to unite government, industry and labor in a common goal, for the common good. This is unique in a world that operates as though these aims were incompatible under a free enterprise system. But in many respects, "free enterprise" in the U. S. is not as free as its mentors would have us believe.
Consider what would happen to any group of companies that united under the EIA banner-or any other banner-to discuss common economic problems or to compare R&D e~orts . The moment a dollar sign appeared, U. S. antitrust forces would declare it a no-nodefinitely out of bounds, and generally a substitute for price fixing. And wouldn't the company patent attorneys have a field day on the subject of what any engineeer might disclose! After many years' service on both EIA and IEEE committees, I assure you t his is no figm ent of my imagination.
What this country needs is to r ecognize that we are playin g a global ball game. Federal policy must be changed to reflect this fact. We cannot have one set of rules for the Japanese, largely favorable to them, whi le we play under ru les that are absurd, outdated, and severely restrictive. While Japanese companies have adopted a paternalistic approach to laborincluding engineers-CT. S. companies cons ider labor expendable and engineers an expensive commodity! Meanwhile, U. S. labor con-

Select

BULOVA/ATP

oscillators siders its work-output of little im-
portance, quality irrr!('vant. and 1.._,·a lt _,. nil. But in .Japan , labor

to meet your seeks a secure lifetime job, takes
pride in its work and stays with the employer. The quality of prod-

frequency/ ucts coming out of Japan today
clearly reflects these differences. What we certainly don't need in

this country is more electronic
timing needs businesses-unless one is ready to
admit that the vast military-space

complex cannot be successfull y con-

verted to peacetime, nonspace use. With thousands of companies retrenching, we need to use the existing plant more effectively. But

D Computer Clocks D Term inals D Facsimile

if this cannot be done, then death D Timing Systems

and re-birth under new names do D Data Transmission

not really constitute "new" busi- . ness. And whi le this is going on-

Peripherals 1/0

what a tremendous latent advan- D SecurityI Alarm Systems

tage we are handing to the modern, fully geared plants of Japan that can move ahead without pause !
In short, while Japan has unified t he .objectives of government, in-

D Process Control
ATP capability can provide oscillators to meet all your frequency needs - with many frequencies available from stock.

du stry and labor, we seem to be

moving toward aimless self-inter-

est. We must reverse this trend if

we are to avoid trouble at home,

let alone face a powerful market-

ing adversary.

Such tangential ideas as develop-

ing "new" companies, or introduc-

ing "Picturephones" by "1980" are

irrelevant. Moreover, they fail to

recogn ize the growth problem

which is taxing the telephone com-

panies' ability to handle the new

computer peripheral devices while

maintaining adequate vo ice tele-

phone service. A difficult domestic

problem is not likely to provide the

solution to an urgent international

p r o b lem .

Charles A. Cady

Consulting Engineer 42 Shaw Drive Wayland, Mass.

Electronic Design welcomes the opinions of its readers on the issues raised in the magazine's editorial columns. Address letters to Managing Editor, .Electronic Design, 850 Third Ave., New York, N. Y. 10022. Try to keep letters under 200 words. Letters must be signed. Names will be withheld on request.
ELFCTRON IC DESIGN 25, December 6, 1970

AMERICAN ____...,;;,...._.TIME PRODUCTS
Electronics Div ision of Bulova Watch Co ., Inc . 61-20 Woodsid e Ave., Woodside, N. Y. 11377 (212) 335-6000
INFORMATION RETRIEVAL NUMBER 6
7

Enroll now in the Magnetics Technology Center .·

Magnetics introduces a post-grad center that keeps you up to date on the state of the art in magnetic materials. No campus; no fee; texts free. You learn on your own time.

We don't pretend to be scholars behind ivy-covered walls. We are a group of inquisitive specialists with interests in electronics, electrical engineering, physics, metallurgy and related fields. We work with low and high permeability magnetics, ferrites and photo-chemically machined metals. Some of us have spent over 20 years here at
Magnetics developing theories and
putting them to practical use. Now we'd like to share with you
what we've learned-through a curriculum that no undergraduate school to our knowledge now offers. (Sure, we have another purpose. We believe that as people learn what our products can do, the more these products will be used in future commercial applications. If today we give you the kind of information that will help you do a better job, it seems reasonable to assume you may give us an order someday.)
So we invite you to enroll now in our newly created Magnetics Technology Center. It exists as a repository of what is known about magnetic materials. It intends to spread this knowledge freely-and broadly. It seeks engineers interested in learning more about this field. It welcomes both recent graduates and those who have been involved in design and application for some time. We intend to gear

our programs to your needs. As an enrollee in the Magnetics
Technology Center you will receive without obligation a continuing flow of printed material. You may have received some of this in previous years, but the bulk will be new material developed especially for our Center. Among the items :
l) Magnetics Technology Center Study Courses on such subjects as:
· Ferrites versus magnetic materials
· Photo-chemically machined parts
· Reducing magnetic circuit size and response time
· Ferrites in transformer design
· Proper selection of cores for saturating transformers
2) Magnetics Technology Center Data Bank Files for designers of chokes, coils, inductors, filters, magnetic amplifiers, converter-inverter transformers and electronic transformers
3) Magnetics Technology Center news, at regular intervals, on advances in magnetic materials, applications, etc.
4) Magnetics Technology Center Annual Bibliography of important papers and articles on magnetic science technology
Enroll now. No tuition. No tests.

No campus. Merely fill out and mail the coupon.
MAGNETICS, Magnetics Technology Center, Dept. ED-106, Box 391, Butler, Pennsylvania 16001
How do we qualify to institute this Center?
· We developed the 550 Mu Flake Core, an industry first, that allows miniaturization without excessive circuit losses
· We tightened up industry inductance tolerances for powder cores. Twelve years ago the accepted tolerance was as high as ±22%. We went to ±8% and others followed
· We established ourselves as the only approved source of bobbin cores for the Apollo program
· We patented a one-piece powder core die to increase production and help make a more uniform product
· We developed linear inductancetemperature characteristics in powder cores
· We stabilized miniature cores for inductance changes with temperature
· We developed a guaranteed voltage breakdown finish for tape and bobbin cores, eliminating the need for taping
· We developed our own powder metallurgy techniques and producing facilities to gain stricter control of magnetic core properties
· We tightened limits or standards on tape wound cores and set limits on other cores where no industrial standards were in place

Tro-e-n-ro-ll,-c-lip-t-hi-s-a-nd--m-ai-l t-od-a-y.------------------------------------,

MAGNETICS, Magnetics Technology Center, Dept. ED-106, Box 391, Butler, Pennsylvania 16001

Please enroll me in the Magnetics Technology Center and forward all curriculum materials, free of charge, to:
Name --------------------~
Title or Function_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ __

Degree_ _ ______School_ _ _ _ _ _Year_ __ Firm Name_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ __

Field of Interest and / or Product Now Working On_ __ _ City_ _ _______State_ _ _ _ _Zip_ _ _ __

Your associates may wish to enroll also. Have them furnish

Specific Subjects You Would Like Us to Include in the Cur- the above information on their company letterhead and send it to us. We need this data to assist us in selecting your I

riculum_ _ _ _ _ __ _ _ _ _ _ _ _ _ _ _ _ _ __ curriculum.

------------------------------------------------------JI
__·.···.-- mRIJRETICS

A DIVISION OF SPANG INDUSTRIES INC.

INFORMATION RETRIEVAL NUMBER 7

E LECTRON IC D ES IGN 25, Decembe r 6, 1970

IC receptacles difference in panels

Adifferent kind ofIC receptacle.

The AMP receptacle handles

any known IC configuration

(

or package.

Wide contact lead-in permits easy insertion.
Solder version Spring-fit design keeps receptacle
rigid in panel during soldering.

Accepts round or flat leads interchangeably up to
.025 dia. pins or rectangular leads up to .025 x .025.
Unique anti-overstress feature maintains good contact regardless of lead size and configuration.

Stabilizing legs keep receptacle 90° to pan el for consistent center spacing.
Post types-accept up to three TERM I-POINT* clip or conventional wrap-type
terminations.

are where the

·
We don't stop there.

We've designed greater reliability into the critical receptacle portion of your panel designs, but that's only part of the difference in AMP's complete packaging panel capabilities. No other company offers the flexibility that AMP does in panels. We offer a tried and tested panel building technique and AMP's one-house responsibility to back it up.
Tell us what you want.
1. You build the panel.
If your requirements dictate that you build the panels, we don't ju~t supply you with loose receptacles and let you tackle your production problems alone. The AMP IC receptacles are supplied with a carrier strip and special insertion tooling for high speed assembly to the board or panel. We've lived with panel production problems and we'll share the resulting know-how with you.

2. We build the panel.
Obviously, the same time tested know-how can be put to work in our plant to build standard or custom panels for you. The placing of the IC receptacles can be as random or uniform as you need. Remember, our receptacle can handle any IC configuration or package. Pictured below are several of the panels produced for our customers.

3. Either of us wire the panel.
For point-to-point wiring, AMP offers two basic types of panels. One for use with the versatile termi-point wiring technique and another for use with the conventional wrap-type techniques, for use in your plant or ours.

And the price is right.
Forget the usual claim that something better always costs more. The advantages of the AMP IC receptacle are available at a competitive, low per-unit cost, plus there are additional savings in our assembly technique. For more information on the difference in AMP IC receptacles or our panel capability in general, write:
AMP Incorporated, Industrial Division, Harrisburg, Pa. 17105.

*Trademark of AMP Incorporated

INFORMATION RETRIEVAL NUMBER 8

AMP INCORPORATED

I
II Cut the Size of Your
.Power Supply in Half with Fast, High-Voltage
I Transistors from RCA.
I
I
I I

Conventional 5 V, 25 A Supply

New 5 V, 50 A Supply

I· For details and application note, write: RCA, Commercial Engineering, Section

'
ROii
57l-6/ UT14, Harrison, N .J. 07029

INFORMATION RETRIEVAL NUMBER 9

ELl:CTRON JC D 1:s1G 25, D ece m ber 6, 1970

Designer's Calendar

ASmart Way to Beat Your Power Supply Size Problem

JANUARY 1971

1--

s M T wT F s

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31

1
Jan. 12-14 Symposium on Reliability (Washington, D. C.) Sponsors: IEEE et al. J. W. Thomas, Vitro Labs., 14000 Georgia Ave., Silver Spring, Md. 20910.
CIRCLE NO. 401

Jan. 25-26 Optics in Microelectronics Conference (Las Vegas, Nev.) Sponsor : Optical Society of America, Microelectronics Meeting, 2100 Pennsylvania Ave., N. W., Washington, D. C. 20037.
CIRCLE NO. 402

FEBRUARY 1971

I-

sMT wT Fs

1 2 3 4 5 6

abbolt

7 8 9 10 11 12 13
14 15 16 17 18 19 20
21 22 23 24 25 26 27
28
1
Feb. 9-11 Aerospace & Electronic Systems Winter Convention (WINCON) , (Los Angeles) . Sponsors: IEEE et a l. William H. Herrman, Wincon '71, IEEE Los Angeles Council, 3600 Wilshire Blvd., Los Angeles, Calif. 90005.
CIRCLE NO . 403
Feb. 17-19 International Solid State Circuits Conference (Philadelphia, Pa.) Sponsors: IEEE et al. Lewis Winner, 152 W. 42nd St., New York, N. Y. 10036.
CIRCLE NO. 404

I !6" thin . 2.Jl.i " short, yet this converter produces I000 volts DC, regulated, from a battery input of 28 VDC! It weighs less than 15 ounces. This is only one of our wide variety of many small light weight converters, inverters and power supplies there are over 3000 models listed in our newest catalog, including size, weight, and prices. If you have a size problem , why not send for an Abbott catalog?
MIL SPEC ENVIRONMENT - All of the power modules listed in our new catalog have been designed to meet the severe environmental conditions required by modern aerospace systems, including MIL-E5272C and MIL-E-5400. They are hermetically sealed and encapsulated in heavy steel containers. New all silicon units will operate at I 00 °C.

Please write for your FREE copy of this new catolog or see EEM (1969-70 ELECTRONIC ENGINEERS MASTER Directory ), Pages 1834-1851.
,.,.#.811 t r a n s i st or

L ABORA T O R I ES . 1 NCORP0RA T E Q

5200 W. Jefferson Blvd./ Los Angeles 90016

(213) WEbster 6-8185

Cable ABTLA85

RELIABLE - Highest quality compo ne nt s are used in Abbott power modules to yield the high MTBF (mean time between failure) as calculated in the MIL-HDBK-217 handbook. Typical power modules have over 100,000 hours MTBF - proving that the quality was built in from the beginning. WIDE RANGE OF OUTPUTS - Any voltage from 5 volts DC to I 0,000 VDC is avai lable by selecting the correct model you need from our catalog with any of a variety of inputs including :
60~ to DC, Regulated 400~ to DC, Regulated 28 VDC to DC, Regulated
28 voe to 400~. 1¢ or 3¢
60~ to 400~. 1¢ or 3 ¢
TO : Abbott Transistor labs., Inc., Dept. 57 5200 West Jefferson Blvd . Los Angeles , California 90016
Sir: Please send me your latest catalog on power supply modules :
NAME - - - - - - - - DEPT. - -
COMPANY - - - - - - -- - -
ADDRESS - - - - - - - - --
CITY & STATE - - - - - - - --

ELECTRO IC DESIGN 25, December 6, 1970

INFORMATION RETRIEVAL NUMBER l 0
13

Reliability is six things we do that nobody else does.

We're fanatics.
We build our relays stronger than we have to. That way, they last lots
longer than they ever have to. Our Class E
relay (shown on the opposite page ) is a good example of our way of thinking.
The industry's strongest heelpiece.
We make the strongest heelpiece in the industry. A gigantic machine bangs them out extra fat and extra flat.
Extra fat to carry a maximum of flux. To handle big loads. Extra flat so that once an AE relay is adjusted, it stays adjusted.
Since our backstop is· part of the heelpiece, it's just as thick and flat. But, tough as it is, the slightest wear here would throw the entire contact assembly out of whack. So, to be safe, we weld two tiny, non-magnetic pads where the armature arms meet the backstop. You might say we created the no-stop backstop.
Three parts that'll wear like crazy.
When you build a relay like a small tank, you have to think of everything. We try. Right down to the tiniest part. For example, we make our armature arms and bearing yoke extra thick.

Butlers with lots of muscle.
We make our buffers of a special tough phenolic material that lasts. And lasts. And lasts. All without wear or distortion. Another reason why our relays stay in whack.
To make sure our buffers stay in place, we weld the buffer cups to the armature arms. We weld, instead of using rivets, because our lab found that rivets have a habit of falling out.
For the very same reason, we weld buffer cups to the contact springs. And also use the same special tough phenolic buffers.
No, we didn't forget the contact springs.
We have some strong feelings as to what makes a contact spring reliable. Our sentiment is that two contacts are better than one. So, we bifurcate all the springs, not just the make and break. This slotting and the addition of another contact to each spring means you get a completed circuit every time.
We make each set of contact points self-cleaning. The bad stuff doesn't have a chance to build up.
Now, what's different about our bobbin?
Our bobbin is one piecemolded of glass-filled nylon. This provides the maximum in insulation resistance.
Because our bobbin is nylon, we don't have to impregnate with.varnish. Moisture and humidity have no effect on the stubborn nylon material. No effect means no malfunctions for you to worry about.

Thicker than years of testing and use say they have to be. Then, to make sure they don't cause wear problems, we insert a hardened shim between the hinge pin and the frame. The pin rides on the shim, instead of wearing into the heelpiece. (You can forget the bearing, it's permanently lubricated.)

What all this means to you.
What this all adds up to is reliability. The kind of toughness no one else can give you. It means an AE relay works when it's supposed to, longer than it has to.
Isn't this the kind of reliability you really need? Automatic Electric Company, Northlake, Ill. 60164.

AUTOMATIC ELECTRIC
SUBSIDIARY OF GENERAL TELEPHONE & ELECTRONICS
INFORMATION RETRIEVAL NUMBER 11

Nobody-but nobody is a source for more T2Ltypes than Motorola

ELECTRON IC DESIGN 25, December 6, 1970

MSl/Complex-function:
COUNTERS: Divide by 10 Divide by 12 Divide by 16 Programmable Modulo·N Presettable

Series 5400/7400

Series 4300/ 4000

Series 9300/ 8300

Series 8200/ 7200

TOTAL 11

2·

... including these most-used, Complex-function/MSI types:

Motorola made a commitment ...

DATA SELECTORS:

one year ago ... to become "one

Dual 4-i nput 8-input

of the World's leading suppliers

of series 54/74 T 2L integrated

DECODERS/DATA DISTRIBUTORS: BCD to Decimal

circuits in 1970." The above

Excess-3 to Decimal

lineup of complex-function/MS!

Excess-3 Gray to Dec imal BCD to 7-segment

1 4

circuits indicates that we've done

Binary to l·of-16

1··

that. .. and, then some! Here's the rest of the story :

Binary to 2-of-8 Binary to 1-of-8 Binary to 1-of-8

In all, Motorola offers you the in-

Invert/ non-invert Dual Binary to l·of-4 line

dustry's most complete, inter-

BCD to Decima l/Driver

changeable selection of T 2L, for

Dual l·of-4 line Dual l ·of-2 line

all of your design requirements.

ENCODERS:

Seven (7) families, plus ... Check

Binary to BCD

the lineup:

BCD to Binary

· MTTL I - MC500/400
. series (SUHL I ) MTTL II - MC2100/2000
. series (SUHL II) MTTL III - MC3100/3000
. series (SN54H/74H) MC4300/4000 series complex
. functions M C5400/7400 series (SN54/74 )

ARITHMETIC FUNCTIONS: Adders Dual Adders 4-bit Adders Look-ahead-carry-lock
SHIFT REGISTERS: 4·bit Universal 8-bit Serial Dual 8-bit Serial
LATCHES and FLIP FLOPS: 4-bit Latch Dual 4-bit Latch

·. MC8200/7200 series complex

Quad D Flip Flop

. functions MC9300/8300 series complex

MEMORIES: 16-bit RAM

functions

64-b it RAM 128-bit ROM

1 ·

.Plus, these additional capabilities: MTTL Beam Lead ICs and . Chips. MDTL&MTTL Dielectrically-Isolated Circuits.
· The World's broadest line of

256-bit ROM
MULTIVIBRATORS: One -shot Retriggerable 1-shot Voltage-control led
PARITY TREES: 8-bit Dual 4-bit

system-compatible MDTL

Single-error Hamming-Code

circuits.

Detector and Generator

12
7 2*
6 4
3 3

For complete data,including high-

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1 *

light specifications and selection

FREQUENCY PHASE DETECTOR

guides, write: P.O. Box 20912, Phoenix, Arizona 85036.

*To be introduced within 30-days.

The Logical T 2L Choice is yours.

··F unctionally-replaceable by 9300 series type.

MOTOROLA TTL
- total capability . .. of course I

INFORMATION RETRIEVAL NUMBER 12

ELECTRON IC D ESIGN 25, D ecember 6, 1970

NEW!

QUAD

POWER DRIVERS

REDUCE

PACKAGE COUNT
,.

FIFTEEN NEW
DRIVERS INCORPORATE MONOLITHIC LOGIC GATES DRIVING HIGH-CURRENT SWITCHING TRANSISTORS
Extremely versatile power devices designed for lamp driver, relay driver, level shifter, and a wide variety of similar applications. Operating at a standard Vcc
voltage of 5 volts, each driver output transistor is
capable of sustaining 40 volts in the OFF state while sinking 150 mA in the ON state . Special selection can guarantee even higher breakdown voltages and sink currents. Other features include inputs

Cat. No.
UHC -400 UHC -402 UHC-420 UHC -451 UHC -459
UHD -400 UHD-402 UHD -420 UHD-451 UHD -459
UHP -400 UHP -402 UHP-420 UHP-451 UHP -4 59

Description
Quad 2-input AND Quad 2-input OR Dual 4-input AND 2-wide, 2-input AND-OR 2-wide, 2-3-input AND -OR
Quad 2-input AND Quad 2-input OR Dual 4-input AND 2-wide, 2-input AND -OR 2-wide, 2-3-input AND-OR
Quad 2-input AND Quad 2-input OR Dual 4-input AND 2-wide, 2-input AND-OR 2-wide, 2-3-input AND-OR

Package

Temp. Range

14-lead flat pack

- 55 c to
+125 c

14-lead ceramic
dual in -line

- 55 c

to +125

14-lead plastic
dual in-line

to +70

that are compatible with DTL/TTL logic devices, and pinning compatible with Series 54/74 networks.

For the name of your nearest stocking distributor, call or write to Bill Campbell or Bill O'Connor, Functional Electronic Circuits Operations, Sprague Electric Co., 115 Northeast Cutoff, Worcester, Mass. 01606. Telephone 617-853-5000, Ext. 314, 270, or 313.
For Engineering Bulletin 29300, write to Technical Literature Service, Sprague Electric Co., 347 Marshall St., North Adams, Mass. 01247.
THE BROAD-LINE PRODUCER OF ELECTRONIC PARTS

SPRllGUE -
THf MARK OF REllABILITY

INFORMATION RETRIEVAL NUMBER 13

ELECTRON IC D ESIGN 25, D ecember 6. 1970

highligbjjQQ

Correlation techniques offer a powerful means of extracting lowlevel signals from noise and for analyzing the frequency spectrum of complex ac signals. But too often correlation methods require expensive, sophisticated test equipment or general-purpose analog computers.
Not anymore! With today's lowcost amps and multipliers, many of these instrument and computer techniques are practical for use in system design.
A basic correlator circuit can be designed with a component cost of around $100. The simple circuit described uses only two multipliers and two op amps. Page 66

Electronics on a more intricate scale is invading the toy industry. Circuits that respond to a variety of input stimuli are turning up in playthings: They include sound, light, heat, touch and moisture (baby-doll wetting). The outputs activate small motors, solenoids, light bulbs or some combination of these elements. And between the inputs and outputs, circuits may be interposed to perform many kinds of logic or timing functions.
Present electronics are limited to small printed-circuit-board technology. But, as yet,. no toy manufacturer is using integrated circuits.
Why not? The answer is costperipheral resistors and capacitors are needed. But predictions are that in the next year or two the costs of ICs will be low enough for general use by the toy industry. Page 36

monolithic and discrete components in a T0-5 can, a new low-cost hybrid operational amplifier features input bias currents of less than 0.01 pA.
These very low input currents are achieved by an isolation technique that allows the case to follow the applied input voltage. This prevents any leakage from the case to the input pin, which would result if the case were at ground or collector-supply voltage levels.
The new op amp is frequency compensated internally, has a 5-mV input offset voltage, an adjustable offset voltage range of ± 25 mV and common-mode rejection of 60 :1. Page 117

ELECTRONIC DESIGN 25, December 6, 1970

TRY TO MATCH THIS
for size

you can't!
For their size, Type BB resistors pack a tremendous power dissipating ability. Rated 1/8 watt at 70 ° C in a 0.0004375 cu. in. volume.
And miniaturization has not reduced reliability. Tests prove it. They satisfy the highest level-the S level-of the latest MIL-R-39008 Established Reliability Specifications in all resistance values.
The key is hot molding-the Allen-Bradley way. A-B developed and built the machines. Only A-B uses them. They're fully automatic. Built-in precision control. A high degree of uniformity. Predictable performance from resistor to resistor-year after year.
For immediate delivery at factory prices call your authorized A-B industrial electronics distributor. Or write Marketing Dept., Electronics Division, Allen-Bradley Co., 1201 South Second St. , Milwaukee, Wis . 53204. Export Office: 1293 Broad St., Bloomfield, N.J., U.S.A. 07003. In Canada : Allen-Bradley Canada Limited.
@Allen-Bradley Company 1969

Exclusive
Only A-B Type BB RCROS meets MIL-R-39008 ER (established reliability) for 1/8-watt resistors at the S level. Shown actual size.

ALLEN-BRADLEY
QUALITY ELECTRONIC COMPONENTS
EC69·80

news scope
DECEMBER 6, 1970

:where to go in MOS debatedin 'Silicon Valley'

SUNNYVALE, CALIF.-Which of .the proliferating MOS technologies will win out in the 70s? A panel of manufacturers including IBM, National Semiconductor, Intel, General I n st r u in en t, M o st e k and American Microsystems debated this question last month in front of 500 of their competitors at a local chapter meeting of the IEEE in the heart of semiconductor land.
The technologies they considered were N-channel, high voltage P-channel, and four low-voltage P-channel types. The low-voltage types inc.Jude silicon gate; metalnitrous-oxide semiconductor ; ion iinplantatiori; and crystal-orientation-100 aluminum-gate. Eventually every manufacturer will use his favorite combination of the newer technologies. Meanwhile, high-voltage P-channel, the first of the MOS technologies, will be around for awhile if only because it is well understood.
IBM's L. V. Gregor claimed considerable success making Nchannel devices in the laboratory, but he declined to say when IBM will be using this technology. Nchannel is considerable faster than P-channel, but also far trickier to make.
All the technologies, including high-voltage P-channel, can be passivated by placing a glass layer over the top, making it possible to package products in low-cost plastic.
The panel agreed that silicon gate can save area in random logic chips that contain a high ratio of interconnects to active devices. However, Floyd Kvamme of National Semiconductor argued that this is not an advantage in very regular structures such as ROMs, where the area eaten up by contacts between the two layers of interconnects is large.
L. J. Sevin, president of Mos-

tek, pointed out that the ion-implant technique (wherein the gate region is bombarded by boron ions to lower the threshold voltage) can also produce depletion-mode transistors. Their turn-off time is faster, and they consume less area.
Engineers make it easier for computers to talk
New techniques of analyzing speech sounds by engineers at Bell Telephone Laboratories have made it considerably easier for computers to talk. Previously, information based on samples of speech waveforms was stored in a computer and later synthesized to form speech.
The new method, in which vocal tract resonances are converted to numbers, t a k e s between onefiftieth and one-hundredth the amount of information normally required to produce computer speech. This makes it practical for the first time to store large vocabularies of synthetic speech in talking computers, according to
Words are turned t o numbers and stored· in one-hundredth the space previously required to make a computer talk..

Bell Labs. The Murray Hill, N. J., r esearch
and development organization points to a range of telephone communication services that may be provided once computers can talk as easi ly as they print out information:
· A computer "librarian" could provide publication information in response to a telephone request.
· Computer "weather reporters" in aircraft or space vehicles could give verbal reports.

Super LSI predicted, along with 4-chip TV

·-wm Metal nitrous oxide semiconduc-

tor (MNOS) technology

give

rise to· 100,000 gate-per-chip de-

vices, C. Lester Hogan, president

of Fairchild Camera and Instru-

ment Corp., told the 1970 Hybrid

Microelectronics Symposium in Los

Angeles.

In commenting on other progress

in microelectronics, he noted t hat

by the middle of 1971 Fairchild

would be delivering to a Japanese

company, on a single chip, the elec-

tronics for an entire desk-top cal-

culator.

And speaking of linear circu.its,

Dr. Hogan predicted that by the

middle of next year ·the circuitry

for a complete black-and-white TV

would be put on three or four

chips. Color TV? That will require

six chips, Dr. Hogan said.

Memory battle height~ns at computer show
The long-heralded battle of the ferrite core vs semiconductor memories was finally joined at the 1970 Fall Joint Computer Conference as t h r e e manufacturers showed operating mainframes that use fast semicondu ctor storage. All these mainframes had · previously been announced, but they were receiving their first public exposure at the Nov. 17-19 meeting in Houston, Tex.
The three computers were all minis, and two of the companiesFour-Phase Systems, Cupertino, Calif., and Data General Southboro, Mass.-were attracting a large share of the 20,000 registrants. The third minicomputer

~ INFORMATION RETRIEVAL NUMBER 14

with semiconductor storage-IBM's System/7-drew fewer visitors, possibly because it is being sold directly to end users, as opposed to OEMs, and few end users were in sight at the show.
Attendance was a sore point at this year's Fall Joint Computer Conference, being roughly ,50 % below last year's nearly 40,000 registrants. About 25% of the total paid the registration fee. The remainder were exhibitors or guests. Some booths were so poorly attended that their staffs kept themselves busy discussing the national economic downturn or visiting competitors' exhibits.
As for the semiconductor memories, proponents stressed their higher speed and better performance, while their detractors point.ed to the higher costs with respect to core memories and the problem of volatility-loss of memory content in case of power failure. At least one major manufacturerDigital Equipment Corp. of Maynard, Mass.-indicated that it was looking to their early application. Nick Mazzerese, - vice president ·of Digital Equipment, said the company would introduce a computer with a semiconductor memory "as soon as it is cost-effective." The indication was that this goal might be reached by late 1971.
Educator sees growth in industrial R&D
Industry-suported research and development will grow at least as fast as the Gross National Product during the 70s, Dr. Frederick E. Terman, former dean of the Stanford School of Engineering, recently told a group of IEEE engineering managers in Palo Alto·. .Calif.
New EEs with graduate degrees will look to industry for jobs, now .that universities are fully staffed and Government-supported R & D programs have dried up, Dr. Terman said. But, he warned, industry will not be able to absorb these men as rapidly as the schools are turning them out. Furthermore, he said, industry will look for more "flexible" men with broader training than the typical Ph.D. candidate offers today.
"This means we will have to

start training the students for where the market is," Dr. Terman said. "Ph.D. candidates should do research to find out how research is done, not to become experts in one speciality."
There will have to be less sharp specialization, the former engineering dean said, and more opportunities to pick up related trainingsuch as computer programming.
Lasers ray of hope as electronics slumps
Sales of gas and solid-state lasers, equipment and systems are showing a continuing upward growth despite the current dec1ine in other areas of the electronics field, according to a spokesman for RCA Components Operations, Harrison, N. J. Industry sales, RCA claims, have increased 40 % in the first half of 1970 as compared to the first half of 1969. And the company believes this growth rate will continue to 1971.
"The unit volume of small gas lasers is up," says C. Harry Knowles, president of Metrologic Instruments, Bellmawr, N. J., which specializes in the · production of small He-Ne gas lasers. "But the dollar volume is holding steady because of price deteriorations in this area during the last few months. We do anticipate a 30 % to 40 % increase in 1971.
A survey recently released by the Electronic Industries Association showed total sales· of lasers for the first half of 1969 reaching $43.6-million, up 40.6 % over second haif 1968 sales. Gas lasers recorded the greatest gain, with 78 % of the sales, while solid-state lasers were up 16 % over 1968.
Laser sales for R&D in the first six months of 1969 were placed at $18.7-million, with the Government the largest buyer.
Atomic battery built, with 10-to-20-year life
A nuclear battery reported capable of supplying continuous power for 10 or 20 years has been developed at Resalab Scientific Div., Menlo Park, Calif. The battery consists of a small fuel cell

containing plutonium 238, which gives off heat that is converted to electric energy by an array of semiconductors.
Valvo Raag, director of the company's Energy Conversion Dept., says that the device is potentially cheap enough to compete with chemical batteries in such commercial applications as heart pacemakers and even flashlights.
NASA has developed similar devices that consume hundreds of watts for space work, Raag reports, but they require large fuel cells. Low-power devices-in the milliwatt or microwatt regionthat use small cells have been in development for two or three years, primarily for pacemakers, he says. But these devices have very low output voltage-a few lOths of a volt typically-and therefore require a de/ de converter to step them up to the 4.5 V necessary to power a pacemaker. Since there is a power loss across the de/ de converter itself, a larger fuel cell must be used to compensate for this, and thus the cost of the device goes up. Resalab says its device can put out the required voltage without using a de/ de converter.
At present it is against the law to sell radioactive devices for commercial use, but Raag says the matter is under Government review.
Labor Dept. to bring job and engineer together
A national registry, comprising a central file of engineering job applications and job opportunities, has been set up by the U. S. Dept. of Labor, and went to work the first of November.
The registry, organized with the cooperation of the National Society of Professional Engineers and the California Dept. of Human Resources, is located at 800 Capitol Mall, Sacramento, Calif. 95814. Although located in California, the organization will provide specialized assistance to engineers throughout the country.
Applicants may secure forms from either the local office of their state employment service, or through the facilities of professional engineering societies.

INFORMATION RETRIEVAL NUMBER 15 ·

MAKE YOUR CONNECTIONS: FAST. With Molex standard and miniature connectors. They're easier to work with. Simplify wiring. Speed production. Save assembly steps. Make installation and servicing extra easy, too. This is why circuitry idea men everywhere are making connections with Molex. From one circuit to 104 or more. Production keyed and available in a variety of colors to meet design requirements. Molex has the

connector. Plus the design and engineering

capability to solve the most complex wiring

problems ··· fast. For a colorful free sample

of the Molex connector write: Molex Incor-

porated, Downers Grove, Illinois 60515. Or

you can make connections by

calling (312) 969-4550.
··· creating components that simplify circuitry

~
111olex
'-...../

CELANESE NYLON. THE HEAD START MATERIAL.

Give your products a head

Maybe that's why retainer

start on top product design,

rings in GE hair dryers are

performance and economics.

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With Celanese Nylon.

Nylon. And why GE uses

General Electric does. In

Celanese Nylon for gears and

GE hair dryers, for example,

bushings and bobbins in their

the resilience of Celanese Ny-

broad line of oscillating fans

lon gives coil bobbins the kind

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head start by writing for a

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PLASTICS

news

Surface-wave devices offer cheap signal processing

You press the "A" key on your terminal and send a pulse traveling down a fine metallic grating the size of an IC. At the other end of this grating, the pulse emerges as a unique analog or digital waveform that is broadcast to the mirror image of that grating thousands of miles away. There it is reconverted to a pulse that taps out the letter "A."
Cheap signal processing of all kinds-that's the promise of new surface-wave devices that can be massp r o du c e d by the s am e p h o t o 1i t h og rap hi c techniques that are used to make ICs. Probably the hottest new technology since MOS, surface waves can be used to make i-f delay lines, inexpensive TV filters that never need tuning, expanders and compressors, and encoders and decoders. They also show promise for making amplifiers, as well as nonlinear devices such as frequency multipliers, mixers and correlators.
The nonlinear characteristics of surface waves, however, are still being explored in the laboratory, whereas linear devices are actually being delivered to customers.
At the moment, surface-wave devices are used only for military applications, where the high cost of the materials is a negligible part of the total system cost. (For example, the favorite materiallithium niobate-costs $50 or more per cubic centimeter, even in very
Elizabeth de Atley West Coast Editor

large quantities.) However, researchers are confident that lithium niobate will get cheaper as manufacturers learn to make it more efficiently, or that less ex-
pensive materials will be found that serve the purpose.
Already Zenith Radio Corp. has built experimental i-f filters for color TV out of very low-cost lead zirconate titanate ( PZT ) , a ceramic, and has tried them out in a TV set. According to Adrian DeVries, leader of the ultrasonic research group at Zenith's Radio Microcircuit Facility, Elk Grove, Ill., the picture was of good quality and contained no noticeable ghosts due to reflections or crosstalk.
A typical color TV i-f strip contains about 10 LC-tuned circuits that must be precisely tuned

together to pass a particu lar frequency band. DeVries says that all these filters have been replaced in the experimental TV set by three surface-wave devices. Their bandpass is fixed permanently by the spacing and overlapping of fine
metal lines deposited on a piezoelectric substrate by photolit:hographic techniques. Thus, once the master is designed, filters of the desired bandpass can be mass-produced. Despite these inherent advantages, it's a question whether surface waves can undercut in price an established technology such as LC-tuned filters for a mass market right now. But the day will soon come, DeVries believes, when they can.
What are surface waves?
What are these waves that can be filtered and shaped · by fine metal lines? They are acoustic waves that travel along the surface of a material, twisting and bending it like waves in water. They can be generated in any solid by hitting it, and they can be generated in a piezoelectric material by applying a voltage to its surface.
The advantage of converting electromagnetic waves into acoustic waves is the great reduction in speed and the consequent feasibility of making long delay lines in a small space. In single-crystal lithium niobate, for example, acoustic waves travel along the surface at about 3.4 by 105 cm per second- some five orders of magnitude slower than electromagnetic waves. Thus 1 µ,s of time

.... IN FO RMATION RETRIEVAL NUMBER 16

delay can be achieved in 1/ 3 cm of lithium niobate, whereas it would take about 1000 feet of coaxial cable to delay an electromagnetic wave by the same amount.

Surface waves can be controlled
Acoustic waves can be made to travel through the interior of a material, as well as on the surface, and bulk-wave devices have been in development for several years. The reason for the excitement about surface waves is that, because they travel on the surface, they can be easily controlled. For example, the frequency bandpass and the shape of a surface-wave signal are determined by the geometry of the transducer, which normally consists of thin strips of metal interleaved like the fingers

This filter can be used to encode or decode a digital signal. It was developed at MIT Lincoln Laboratory, Lexington, Mass.

"hands" of a transducer (see Fig. 1) . This induces an electric field between adjacent fingers, which generates acoustic waves. These waves travel along the surface of the material at right angles to the fingers in both directions away from the transducer. Thus there is a 3-dB loss at the transmitting

adjacent fingers cancel. Thus for maximum power, the distance between finger centers must equal half the wavelength, As, of the surface wave. The fingers themselves are A../2 in width, and the distance between finger edges is A8 / 4. Since lithium niobate has an acoustic velocity of 3.4 by 105 , at

HIGHLY POUStED __,.__ _PIEZOELECTRIC
SURFA«

1. Surface waves are generated in piezoelectric material by impressing a voltage on a flat metal transducer shaped like a pair of hands with interleaved fingers.

REFLECTION LESS ....._-----SURFACE WAVE
TERMINATION
They travel along the surface of the material, much like waves in water, and are coupled back out to an electrical output circuit through a similar transducer.

of two hands. Surface-wave devices are new
compared to bulk-wave devices because the state of the photolithographic art until recently did not allow the required precision of spacing between the transducer fingers. The higher the frequency, the smaller this spacing must be. Since surface waves travel at a velocity that is independent of frequency, the required spacing becomes infinitesimal at high frequencies. For example, at 1 GHz in lithium niobate, the finger separation must ·be about 0.8 micron. However, recent advances in IC technology make this degree of control possible.
Surface waves are induced by impressing a voltage across the
26

transducer because half the power travels in the wrong direction. There is a similar 3-dB loss at the receiving transducer, because a fourth of the power is reflected back to the input while a fourth travels through the transducer to the other side.
The frequency bandpass of a transducer with evenly spaced fingers is maximum at the frequency where half of the acoustic wavelength is equal to the distance from the center of one finger to that of its neighbor. At this frequency the wavelengths generated by each pair of adjacent fingers add to each other. The bandpass is zero at the frequency where that spacing equals a full wavelength, because here the wavelengths from

1 GHz the acoustic wavelength As =v.ff = 3.4 microns.
The fingers, therefore, must be about 1.7 microns from center to center and 0.8 microns apart for maximum power.
As the number of fingers in the transducer increases, the power at the center frequency increase& also, since more and more waves that add in phase are being generated. At the same time, however, the bandwidth decreases because smaller and smaller changes away from the center frequency cause a phase mismatch somewhere along the row of fingers as the number increases. Thus for maximum bandwidth, a single pair of lines would be ideal- but the price would be high conversion loss due

ELECTRONIC DESIGN 25 , Decemb~r 6, 1970

Signetics makes interface IC's to meet the toughest standards.

COMPUTER PERIPHERALS EQUIPMENT
8Tl3 Dual Line Driver and 8Tl4 Triple Line Receiver. Interface with the IBM system 1/0 interface channel-to-control-unit.

.........-
IBM
360 1/0 INTERFACE
CHANNEL

8TI3
.......... 8TI4

PERIPHERAL
EQPT.

COMMUMCATIONS EQUIPMENT
The 8T15 Dual Line Driver and 8T16 Dual Line Receiver. For data transmission and reception between Data Communication and Terminal Equipment.

8T15

MINlCOMPUTER

8T16 .........-

.....
--.....-

8T16

8T15

~
PH ONE MODEM LI NES
~

The 8Tl3 Driver/8Tl4 Receiver features: 1. Party-Line Multiplexing Operation. 2. Short Circuit Protection. 3. 8Tl3 High-Power Drive Capability:
- 75 mA at 2.8V ("I" level). 4. 8Tl4 Receiver Input Hysteresis of 0.5
Volt (typ) provides High Noise Immunity.

The 8Tl5 Driver/8Tl6 Receiver features:
1. Meet EIA Standard RS-232C and MILSTD-188B and CCITT V24.
2. ± 25 Volt Output Short Circuit Protection.
3. 8T16 Dual Receiver accepts single (EIA) or double-ended (MIL) inputs and provides output strobing control.
4. 8Tl6 Dual Receiver Hysteresis: EIA Hysteresis - 4V MIL Hysteresis - 1.2V

Detailed data sheets, comprehensive application notes available.
Sample parts too -we've got the devices on the shelves ready to go. Contact your Signetics salesman, local distributor or Signetics Corporation, 811 E. Arques Avenue, Sunnyvale, California 94086. (408) 739-7700. A subsidiary of Corning Glass Works.
Signetics l:SI

INFORMATION RETRIEVAL NUMBER 17

ELECTRONIC DESIGN 25, December 6, 1970

to electrical mismatch.
The input transducer is an impedance in the electrical input circuit that must be matched for maximum power transfer. The fewer fingers the transducer contains, the smaller its capacitance, and therefore the lower the bandwidth of the electrical input circuit. The same is true of the output circuit. For a given material there is an optimum number of fingers at which the bandwidth of the electrical circuit and that of the transducer are both as large as possible.
Dr. Donald Armstrong, senior scientist, Litton Industries, Electron Tube Div., San Carlos, Calif., points out that for lithium niobate, the optimum number of fingers is between eight and nine. With that number, he says, the bandwidth

as to encode and decode them. An analog expander/compressor
(see Fig. 2 ) works this way: If a pulse containing many frequencies is applied to the input transducer, the frequencies sort themselves out in the pattern of the grating. The higher frequencies are coupled to the narrower spacings and the lower frequencies to the larger spacings. (Of course, the number of fingers spaced to pass a particular frequency must be fairly large so that the bandpass at that frequency will be small. )
The high frequencies reach the output transducer first and are coupled out as the leading edge of an expanded pulse. The same delay line can be used to compress a signal that is the mirror image of this output- in other words, a sig-

nal whose leading edge contains the low frequencies and whose trailing edge contains the high frequencies.
The low frequencies arrive at the input transducer first and are coupled into the delay line. By the time they arrive at the similarly spaced gratings at the right end of the output transducer, the high frequencies of the trailing edge have also arrived at the output transducer, and the result is a single sharp pulse.
An analog encoder or decoder can be made by varying the spacings according to the desired code.
A pulse can be similarly expanded, compressed or coded digitally by tapping a grating at various points and reversing the phase selectively to produce the desired pattern of ones and zeros (see

OUT

CASE 2

A
PULSE OUT

2. Surface-wave· delay line with input and output transducers having graduated gratings that are mirror images of each other can be used as analog pulse expanders

and compressors. One such device produced by Hughes Aircraft Co., Culver City, Calif., can expand or compress a pulse by a ratio of 500: 1.

percentage is about 20 to 25 % using the simplest electrical matching circuit-an inductor to tune out transducer capacitance.
The very small finger spacings at high frequencies limit the upper frequency of surface-wave devices that can be made by photolitho graph ic techniques to 1 GHz or less. Above this limit costly techniques such as the scanning electron microscope are required to obtain the fine finger spacings.
Output is frequency-modulated
By varying the finger spacings along the transducer, it is possible to frequency-modulate the output. This principle can be used to expand and compress pulses as well
28

A nonlinear device
A nonlinear surface-wave device developed at Stanford University by Prof. C. F. Quate, can correlate electronic signals with a bandwidth of 15 MHz at an input frequency of about 250 MHz and a maximum delay time of 6 µs. Other researchers say that much larger bandwidths and delays of hundreds of microseconds are possible. Unlike linear surface-wave devices, which are frequencylimited to about 1 GHz, this device can be used over a range well up into the microwave region. Such a device could do real-time processing of very complex signals at GHz rates.

photo on page 26 ). One difficulty with surface-
wave devices is the attenuation of the waves as they travel through the · substrate. This loss, added to the 6-dB insertion loss at the transducers, is appreciable.
In most applications, the insertion losses can be overcome by using an external transistor amplifier. But there are problems. If the amplifier is placed after the insertion loss, the noise figure will be bad because the signal will be reduced by the loss. On the other hand, if it is placed before the insertion loss, there is an upper limit to the amount of power that can be applied without driving the delay line into a nonlinear mode and finally into breakdown. · ·

ELECTRONIC DESIGN 25 , December 6, 1970

I ·

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From the start we've concentrated on precision. Exclusive methods hold tail alignment within .010-in. radius of true position (.015-in. for .200 centers). The result: fast, accurate wrapping with no delays and no mistakes.
Our precision manufacturing assures good alignment for mating connectors too. We hold your tolerances on plates large or small, configurations standard or ~pe cial. In-line or offset on .100, .125, .150, or .200 inch centers.

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CONNECTOR~

We 've already solved them. It's our business.
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NATIONAL CONNECTOR DIVISION

INFORMATION RETRIEVAL NUMBER 18

ELECTRON IC D ESIGN 25, December 6, 1970

news

Phase locked loops plus ICsand, presto, better circuitry!

By dusting off an electronic concept known since the 1930s-the phase locked loop-and combining it with recently developed integrated circuits, designers are finding that they can substantially simplify circuitry, improve performance and reduce both size and cost in a variety of applications.
NASA was the first to take a crack at using phase locked loops. It developed the concept in the late 1950s for satellite and space communications, tracking and telemetering-situations requiring the extraction of signals deep in noise. But NASA was strapped with discrete components, and these made the phase locked loop (PLL) costly and complex. For years, PLL found only limited use in civilian design.
What a difference with phaselocked-loop I Cs! In many cases they are changing historical approaches to ·circuit design .
The picture is changing
The conventional PLL is essentially a noninductive, tunable active filter with an adjustable bandwidth from one cycle to tens of megacycles. Most of the conventional applications have so far been in the communications field.
But the picture may be changing. The PLL is turning up now in applications such as these:
· Biomedical instrumentation for the analysis of multichannel data and brain waves.
· Precise control of studio motion-picture camera speeds.
· Low-cost computer terminal modems, as a frequency-shift keyed tone demodulator and modulator.
· Automatic direction finders, to improve bearing-pointing accuracy
Jim McDermott Ea st Coast Editor
30

and extend rece1vmg range. Donald Bloodworth, research as-
sociate at the Laboratory of Experimental Psychopathology in Atlanta, points to two examples to show how the use of ICs in PLLs has reduced complexity, cost, size and power requirements: a 100channel monitor/receiver and a brain-wave monitoring system.
For the 100 channel system, the

channels lay between 300 and 500 kHz and were simultaneously transmitted on a coaxial cable. The channel sampling rate was 120 Hz. Bloodworth chose the PLLs to function as a channel-hunting selector and a narrow-band filter.
The filter specifications were tight enough so that if conventional circuitry had been used they would ·have ·required the use of 100

Phase locked loops and how they work

The phase locked loop, according to Garth Nash, section manager of systems analysis and development at Motorola Semiconductor Products, Phoenix, is
essentially a closed-loop electronic frequency-controlled servo, whnse output locks onto and tracks an input reference signal. A coherent phase lock is obtained by comparing the phase of the output signal with that of the
reference, and any phase difference is converted to an error correction voltage that changes
the output signal phase to make it track the input.
The servo has three basic parts : a phase detect.or, a loop filter and a voltage controlled oscillator (lower left figure). When the phase difference between the VCO and the reference signal is constant, the phase loop iR l1wkc·d. Tf <'ith<'r th<' r<'f-

erence or the VCO output
cha!igea in phase, the phase de-
tect.or and filter produee a de error voltage that i proportional in magnitude and polarity to the original phase change. This
altetintJ!: error voltage changes ihe VCO
oscillator phase by
frequeney, so that it' ataitl ont.o the refe:rence iil'IUIL
The basic phase lock looP
serves 88 an FM demodulator.
without tuned circuits, since the audio component can be extracted at output of the loop filter.
If a programmable frequency
divider is inserted in the feedback path of the phase locked
loop {lower right figure), the output can be made to be some multiple of the reference fre-
quency, supplied by a eryatalcontrolled oscillator. This fa used
for multiple frequency generation. RR with Rynthl'Ri7'.eTR.

ERROR SIGNAL

DEMODULATED FM OUTPUT

LOOP FILTER

VOLTAGE
CONTROLLED
OICILLA'IOR

1-L-OOP--. VOLTAGE

..._____. t DETl<m)lt

FILTER

CONTROL.LED OSCILLATOR

FM SIGNAL

CONTROL VOLTAGE FEEDBACK SIGNAL

RU. f
FRIEO. '
CRYSl'AL CONTROU.IED OSCILLATOR

OUTPUT
f'R!Q·
··

INFORMATION RETRIEVAL NUMB ER 19 ....

t's nice to know its there.

UnitJode offers yot.J hermetically sealed SCRs in metal packages at plastic prices. The bonus in reliability you'll get is performance ~rotection in all types of environmental conditions, wherever your
nd products may be used. Electrically, these SCRs are equivalent the most widely used plastic devices, but none in this price range
offer the high reliability and parameter stability made possible by Unitrode's unique combination of oxide passivated junctions in hermetic packages. Unitrode SCRs range from low-voltage, lowcurrent sensing models to high-voltage, medium current control types. All offer the versatility of lead-mounted design for easy interchangeability in hundreds of applications. The low-price, high reliability of ¢-line SCRs make them ideal for lamp or relay driving and as sensors, for use in pulse generators, timing circuits, motor controls and process controllers. (Sensing types are as low as 24¢ ea. in 100K lots.) They're in stock now, ready for immediate delivery. Can you afford not to use them? For fast action, call Sales Engineering collect at (617) 926-0404 Unitrode Corporation, 580 Pleasant Street, Watertown, Mass. 02172
Send for your free samples and complete specs today.

UNITRODE quality takes the worry out of paying less.

Anode current rating Voltage ratings
Max. gate trigger current Peak On-voltage Package

ID 100 Serles 500mA @ 100° c Case to 200V 200µa 1.7V max . @ 1 Amp . T0-18 can . 0.5" leads

ID 200 Serles

ID 300 Sefies

1.6A @ 70 ° C Case 1.6A@ 70 ° C Case

to 200V

to 400V

200µa

2.2V max . @ 4 Amps . 2.5V max . @ 4 Amps.

T0-5 can . 0.5" leads T0-5 can . 1.5" leads

separate crystal filters. But Bloodworth pointed out, he used only one crystal for the basic reference signal, with digital programming of a single IC-PLL for channel scanning and selection.
In an application requiring the analysis of conventional electroencephalogram data-brain-wave recordings-Bloodworth utilized a PLL with an effective bandwidth of 2 cycles. The electroencephalogram, recorded between 4 to 25 Hz, is scanned by the PLL for signals of interest within 2 Hz bandpass.
While active filters utilizing operational amplifiers might have been used, Bloodworth noted that it would have been necessary to employ a large number and to switch the filters in discrete steps. With the PLL, the scan over the entire band was digitally controlled. And equally important, the signal search was successfully made at almost de levels in the region of noise.
Camera speed good to 0.0001 %
The improvement in speed regulation over conventional velocity

servos used to drive motion-picture cameras has been dramatic with the help of PLLs. Accuracy has jumped
from 0.5 % to 0.0001 % in a new
drive system designed by TechniCraft Co., Pasadena, Calif.
The requirement was to synchronize several cameras taking the same scene in a studio, without connecting wires. Richard Mylius, president of TechniCraft, says he used Motorola's MC 4404 phase and frequency detector, with feedback from the motor shaft derived from a digital electromagnetic pi°ckup and a precisely machined gear. In this case, the motor itself acted as the VCO. The stable reference frequency for the motor drive was supplied by a crystal.
Data transmission improved
To combat the generally poor quality of data transmission over telephone networks, a Signetics 560 PLL is being used in a modem that converts frequency-shift-keyed tone signals with mark and space frequencies to and from digital data. The modem, a part of an automatic dialer and data terminal built by

GONIOMETER

SENSE ANTENNA

BAL
MOO

RF AMP.

MIXER

IF STAGES

DET

llOHz

llOHz
osc .
go·
PHASE SHIFT

""0---:_l BEARING

LOCAL
osc.

r----

r_J1

L_l

I I I IF
SIG
I

COHERENT llOHz

DET

PHASE

LOCK
I MODIFICATION
I . . . . - - 9.0...·. - - - .

PHASE

SHIFT

REF

I 1 PHASE

,__X_T.._AL- _A_M_P- --1

LOCK DET

VCO

I Fl LTER

IL ___ _______ _JI

AMP.

llOHz FILTER

INDICATOR SERVO MOTOR "=

Modified ADF receiver uses a balanced ring modulator for the coherent detector. The PLL detector has a memory feature to hold the pointer steady during signal loss. The PLL modification output drives the bearing servo.

Credex Corp. of Huntsville, Ala., is compatible with the Bell 301A Dataphone.
"We found," says Barry Duggan, vice president of Credex, "that the best way to combat cross-talk and distortion and to improve over-all noise rejection was to match the · time constant of the PLL with the low-speed data characteristics."
The PLL replaced an earlier approach that used tuned circuits and an FM type of discriminator. While use of the PLL improved system performance, Duggan reports, it also eliminated the tuned circuits, thereby reducing the over-all cost and size of modems, and in addition eliminated magnetic interference picked up by inductors from the power supply.
Aircraft ADF made accurate
A fivefold increase in reliable bearing range and an improvement of 25 dB in the signal-tonoise threshold are only part of the success story that resulted from use of the PLL in a new aircraft automatic direction finder (ADF) receiver design, according to Joseph J. Battistelli, research engineer in the Ohio University .Avionics Research Group at Athens, Ohio. The new circuitry also permits the receiver to home in reliably on ADF beacon stations only a few hertz apart in frequency. This contrasts with convention- , . al receiver separations of up to 2 or 3 kHz. And where the bearing pointer usually swings toward lightning discharges in a thunderstorm area, the improved design eliminates this.
The new system, developed under contract to the Army Electronics Command at Fort Monmouth, N. J., improves performance by correlation of the signals from both the sense and loop antennas.
To accomplish this, a conventional ADF receiver was modified by adding a PLL (see figure) to phase -1 o ck a vo ltage-controll ed crystal oscillator (VXCO) signal to the i-f carrier frequency.
The reference signal is applied to the PLL phase detector and to a coherent detector in which phase coherence of both the VXCO output and the i-f carrier is maintained. The coherent detector output drives the ADF bearing-indicator. ··

INFORMATION RETRIEVAL NUMBER 20 ...

lliJJ

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For whatever Darlington application you have, Unitrode ¢-Line

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For fast action, call sales engineering collect at (617) 926-0404

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Free samples on request.

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I'd like to compare the DEC and SYSTEMS lines of small real-time computers. Please send me more information.
Title _ __ _ _ _ __ _ _ Tel. _ _ __ Company_ __ _ __ __ _ _ _ _~ Address,_ __ _ __ _ __ _ _ __ _ City_ _ __ _State _ _ _ _Zip._ _ _

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ELECTRONICS TO PLAY BY

Jim McDermott East Coast Editor

Not too long ago the kid with the greatest collection of Xmas toys wound them by hand to make them run. Then came toys· that eliminated the wind-up; the youngsters flicked a switch, and the toys ran on batteries. This Xmas, junior chauffeurs will be playing with a school bus that closes its door and is off and running when somebody blows a whistle-no wind-up, no manual operation of a switch, just a whistle. Other young drivers will also be operating cars remotely, making them run ahead or turn left or right, by aiming a light at the tops of the cars.
The trend is unmistakable: Elec-
tronics on a more intricate scale is invading the toy industry. Circuits that respond to a variety of input stimuli are turning up in playthings : The stimuli include sound, light, heat, touch and moisture (baby doll wetting ) . The circuit outputs activate small motors, solenoids, light bulbs or some combination of these elements.
And between the inputs and outputs, other circuits may be interposed to produce time delays, to advance from one operating state to another, to repeat a desired sequence of events, or to perform many kinds of logic or timing functions.
Present electronics are limited to small printed-circuit board technology (see photos). An exception is the Light Beam Car, built by Kenner Products, Inc., Cincinnati, which has a ceramic substrate and thick-film resistors (Fig. 1). But, as yet, no toy manufacturer is using integrated circuits.
36

6800

+ IV..::..

R3 0.75

R6 075

t Photocells control motors on the rear wheels of Kenner Products'
bi# Beam Car. Illuminating a photocell turns the first transistor off
and the second on, energizing the opposite motor. Resistors Rl and
R4 serve to equalize the motor drives so that when both cells are illumi·
natect the car goes straight ahead.

ELECTRONIC DESIGN 25, December 6, 1970

PHONO
PICK-IJP
2. The Swingster phono, by Kenner Products, uses the Darlington circuit and PC board shown. Amplifier response is 70 Hz to 50 kHz.

r-------------, r--;;;F---,

R3 IOk
CRYSTAL RZ MICROPHONE 22k

47k

C2 0 .1
+ ..=. 3V

SCR

CAM SWITCH

3. At the blast of a whistle, Remco's Tricky Busy School Bus closes its door and starts up. The PC board and circuit shown have an SCR that is triggered by the whistle-signal output of the microphone, amplified by transistor Ql. With the bus stopped, the cam switch is open, and starting motor current flows through the SCR. As the bus moves, the cam switch closes, shorting out the SCR and returning it to a nonconducting state. When the bus stops, the voltage across Cl holds Ql off for 1.5 .to 2.5 seconds.

ELECTRONIC DESIGN 25 , December 6, 1970

Why not? The answer is the same everywhere: If the I Cs alone had all the circuitry, costs would be acceptable. But the addition of peripheral resistors and capacitors makes the price prohibitive.
Still, ICs are the next step, and predictions are that in the next year or two the costs of ICs will be low enough for general use by the toy industry.

Rock-bottom cost sought
Designing electronic packages for battery-operated toys is tough because of the stress on rockbottom cost.
"Practically anyone can 'cookbook' a circuit, such as an amplifier or Schmitt trigger or time delay," says Robert E. Polewski, director of research for Kenner Products, "but the trick in designing for the toy market is coming up with a circuit that can use the cheapest of transistors and other semiconductors."
The objective, Polewski points out, is to reduce the circuit to the barest elements sufficient to· do a satisfactory job. He gives as a successful example a phonograph amplifier used in Kenner's Swingster, a battery-operated record player that contains only two transistors in a Darlington circuit (Fig. 2). The gain is high enough to raise the signal level of a lowcost crystal pickup to a few hundred milliwatts-loud enough to drive parents to distraction.
The school bus that operates at the sound of a whistle uses a crystal earphone for a microphone and only two semiconductors, a transistor and an SCR. The sound, amplified by the transistor triggers the SCR to start the bus motor. A cam and switch control the cycle time (Fig. 3). The bus is manufactured by Remco Industries, Inc., of Harrison, N. J., and is being marketed as the Remco Tricky Busy School Bus.
Development in secret stressed
The development of toys like these traditionally takes place in a super-secret atmosphere, with factory security as tight as that at the Pentagon. Competition is keen in the toy industry, and even when prototypes are unveiled at the an-
38

nual Toy Fair in New York City every March, attempts are made to keep the techniques of design as secret as possible.
So anxious are toy manufacturers for new, clever electronic ideas that most will listen eagerly to suggestions submitted by freelance engineers with a penchant for toys.
But Polewski also points out that one glaring fault with many ideas submitted by freelancers is that although the concept may be clever and potentially worthwhile, it frequently is not acceptable because the circuit is too complicated. It simply will be too expensive to manufacture. For the mass toy market, Polewski sayrs, the OEM cost of an operating printed-circuit device should preferably be less than $1 in large quantities.
Patrick Tomaro, senior vice president of research and engineering at Remco. Industries, notes:
"A clever circuit by itself isn't generally useful. From a practical viewpoint, it's necessary first to create the concepts of what the toy is to do, then devise the electronics to make it feasible ."
Safety can be a problem
There are other problems in design. While the designer of batteryoperated toys is plagued by battery rundown, those designing toys that run on 110-V ac must, consider safety factors. The design must

protect children against possible shock from biting the line cord, from sticking screwdrivers or metal rods through holes in the .toy, or simply from tearing the toy apart and exposing live portions of the 110-V house circuits.
Underwriters Laboratories has issued safety guides for the designers of toys. These are found in "Standards for Safety, Electric Toys," Bulletin UL 696, third edition, October, 1966, plus revisions. Some of the more important UL suggestions include these:
· If h a z a r d o u s voltages are present inside the toy, it must be assembled so that it can't be taken apart with pliers or screwdrivers (hammers excepted ) . The .toy must be able to withstand a series of drops from three feet to· a hard surface without breaking.
· The line cord must be fastened securely enough to withstand a oneminute pull of 35 pounds.
· Switches and lampholders must be mounted securely enough to prevent turning.
· Toys must be capable of withstanding a 60-Hz sine wave breakdown potential of 900 V, applied between live and dead metal parts.
· Should the toy use a lowvoltage transformer, either in the form of a conventional transformer or as the insulated coil of a motor, it must withstand for one minute a 60-Hz breakdown potential of 1000-V plus twice the rated voltage

ELECTRONIC · DESrGN 25, December 6, 1970

Looking over their work are Richard Culbertson and Joan Klatil , designers for GE's Youth Electronic Section. Tivoli Tim the soldier, and Battery Barney the clown, are small radios. The Circus Wagon is a 110-V clock radio designed
ELECTRONIC D ESIGN 25, December 6, 1970

for the child 's safety. The case is fastened together with pins that must be drilled for disassembly, and the line cord is " chewproof " . A transformer steps the line voltage down to 28 V for the transistor radio.
39

cool
it

Atlee's delta-wave configuration keeps components 80°C cooler than other inserts.
Atlee has a complete line of full-contact heat dissipating inserts for cooling many types of electronic components. Made of beryllium copper to provide unexcelled heat conduction. Provide cooling when used inside cans or castings or are interlocked to form a circle and slid over the component.
Exclusive delta-wave design proves more effective

than that of any conventional insert because more than 80% of the surface contacts the flat area of the delta. Particularly effective when forced air systems are used. Available with or without finish, cut to any length, or in rolled uncut form. Write today for complete information and samples. Atlee Corporation, 2 Lowell Avenue, Winchester, Massachusetts 01890.
<@ atlee corporation

INFORMATION RETRIEVAL NUMBER 22
40

of the high-voltage winding. · After conditioning a toy for
24 hours in air at 32 ° C (89.6 ° F ) and relative humidity of 85 % , a hand-held toy, o·r one likely to be cleaned with a wet or damp cloth or used in moisture, must have a minimum of insulation resistance of 50-K ohms between live metal parts and any dead metal parts.
· Toy mofor control switches must perform satisfactorily when subjected to an overload test of 50 cycles of making and breaking the stalled rotor current at maximum voltage. And the switch must not fail because of burning or pitting of the contacts.
· Heavy, "anti-chew" line cords must be used for ordinary room conditions. For elevated temperatures or wet conditions, jacketed cords are necessary.
Billions in sales reported
Does engineering for toys pay? The potential is great. Last year the toy industry shipped $2.04billion worth of products from its factories, and for the first half of this year, shipments rose by 14.8%, according to Edwin J. Nelson Jr., president of Toy Manufacturers of America, Inc., New York City, the industry's trade association. Nelson predicts that if sales continue at this level, the 1970 total of factory shipments will reach $2.24biilion, a healthy increase.
At least one big manufacturer, General Electric, is convinced that higher-priced, high-quality toys are a growth market: ,GE has organized a new Youth Electronics
Section in Ut!ca, N~ Y, dedicated
to the design and marketing of children's audio-visual educational products, portable record players de~igned around Walt-Disney character motifs, clock and toy radios, and a line of quality children's walkie-talkies to compete with the Japanese deluge of these devices.
In addition GE's Semiconductor Products Dept. at Auburn, N. Y., has a special engineering group engaged in analyzing toy electronics and consulting with toy manufacturers and their designers.
So far as the -toy industry is concerned, it isn't toying with electronics. Clever circuitry is becoming a mainstay of this highly competitive business. · ·
INFORMATION RETRIEVAL NUMBER 23 ~

MiDTEX / AEMCO
.... ...... 180- IOSOAI s voe 325274
t:t: rl JJ

technology abroad

INFORMATION RETRIEVAL NUMBER 24
42

A new telecommunication system to serve Europe, the Middle East and parts of Africa has been proposed for installation between a German and a French terminal, and then by undersea cable to Green Hill, N. J. The new system, will be built, owned and operated by the Deutsche Bundespost and the French Ministry of Posts, with AT&T as the American partner. It would handle 825 voice circuits and could increase service to the Indian Ocean area by a ground station-to-satellite link. The plan is now awaiting FCC approval. Communications traffic between Germany and the U. S. alone increased by 60 % in May, June and July of 1970 as compared with the same period a year ago. For Europe as a whole, telecommunications with the U. S. has increased by 43 % this year as compared with 1969.
To improve Japan's defense capabilities against air attacks, 32 ground-to-air communications links will be supplied to Hitachi Ltd., Tokyo, by RCA in cooperation with the Okura Trading Co. Ltd. They will be used in (JA) F4E tactical aircraft to be built for the Japanese Self-Defense Force. The equipment, designated the ARR-670, will receive and process data necessary to vector an interceptor aircraft to an airborne target tracked by ground radar. The ARR-670, being built by RCA's Communications Systems Div., Camden, N. J., under a $2.5million contract, will use timedivision multiplexing so that a ground control center can transmit vectoring data on many separate targets simultaneously to an equal number of interceptors.
New solid-state optical card, tape and character readers using hybrid packaging techniques have been developed by Integrated Photomatrix (IPL) Dorset, England. One device, a transparent, epoxy-encapsulated package with nine MOS light-activated switches reads standard tapes at speeds in

excess of 3000 characters per second. Each MOS switch is fabricated on a 0.04-inch-square MOS chip and mounted on 0.1-inch centers on a ceramic substrate. A more complex array by IPL has 50 in-line light sensors, together with a shift register. With this unit optical data is inserted simultaneously and read out serially.
A miniature, battery-powered, solid-state laser, capable of continuous operation at room temperatures, was announced by the Standard Telephone Laboratories of England within a few days of Bell Laboratories' announcement of the same device in the U. S. A. The English laser, slated for application in optical communication systems, is fabricated like the Bell laser and is mounted on a chip 1/ 2 by 1/3 mm in area. In a communications system, the output from the new laser would be directed into the ends of low-loss fiber optics cables carrying wideband communications signals.
Electrical switching properties in a liquid tellurium-selenium alloy at temperatures ranging up to 200 ° above its melting point have been observed at the Swiss Federal Polytechnic, Zurich by researchers of the Physics in Solids Laboratory. The switching property was noticed when currentvoltage traces were observed to contain sharp breaks. The physics of how the effect works-and whether or not it is related to solid state switching-is yet unknown.
Soviet scientists have successfully pumped a laser with neutrons while much of the world is speculating about the feasibility of triggering a nuclear reaction with lasers. A research team from Moscow State University bombarded a mixture of helium-3 and mercury vapor with high fluxes of neutrons (5 by l06/ cm2/s ) and produced 10 mW of lasing light at 6150 A. ··

INFORMATION RETRIEVAL NUMBER 25 ...

.......

111 ustration approximately actual size.

MULTI-LAYER

AlSifQ~Q ·

Composite Substrates

· ·

CONSIDER FOR:

MULTI-CHIP CIRCUITS

Tremendous advances continue in these custom made, monolithic multilayered structures of electrically conductive patterns separated and insulated by planes of high-alumina ceramic (no glass). Prototypes frequently are the stepping stones to major ad-

(Both Bi-polar and MOS)

vances. By getting together with

Chip Attachment may be Fl ip Chip or Beam lead.

people to see what we can work out, dramatic progress continues

· · ·

CHIP CARRIERS LIGHT EMITTING DIODE ARRAYS

to be made. Best designs have

evolved through head to head

Can be made in any number of layers.

conversations. A folder giving present design parameters will be

· · ·

COMPLEX THIN FI LM, THICK FILM, or ETCH BACK CIRCUITS
(Standard buried conductor paths permit you to customize

sent on request.

the top layer.)

CODE IDENT. NO. 70371
PHONE 615/ 265-3411 ·
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~a~biogton report·

A domestic satellite decision planned by 19 71
A final decision on domestic satellites and who will operate them will probably be made by the Federal Communications Commission not more than six months to a year after the filing of the last application. And, right now, it appears that the final application will be in by next spring.
The FCC has an option on whether to hold hearings once all the applications have been filed, but such hearings have been known to run four or five years. FCC officials have told ELECTRONIC DESIGN that it's unlikely they will make the country wait that long for domestic satellite service. Present plans are to license a system without holding hearings.
Applications by Western Union and, jointly, AT&T and Comsat are pending before the commission. Microwave Communications, Inc., and its affiliates have also said they wish to file and have been granted an extension until Feb. 28. MCI said it wants to explore using the higher 12-GHz band, which is less crowded than the 4 and 6-GHz bands originally designated for domestic satellites. In addition the broadcasting networks have also been granted an open-end extension, so they can study a report on satellites made for them by Page Communications Engineers.
The networks' eventual decision is regarded as a key factor, because television transmission revenues will have a great economic impact on the company that wins the FCC nod to operate the satellite system. The networks must decide whether to operate their own system or to lease facilities from the satellite operator, as they now do from AT&T's terrestrial facilities.

NASA fighting to maintain present spending level
National Aeronautical and Space Administration brass are meeting with Budget Bureau officials in an attempt to head off budget cuts in the coming fiscal year. NASA feels that its budget request of last winter, $3.3-billion, is the very minimum it can accept if the manned space flight program is to continue, and it is asking the Budget Bureau to approve a similar amount for the coming year. But there is little optimism in the space agency as it and other Government agencies are being told by the Administration to pare to the bone. NASA knows, too, that it faces a tough fight in Congress in the coming year, with manned-flight critics in a position to cite Russian succes:aes in unmanned space exploration.

House committee will push for more Navy vessels
The House Armed Services Committee is quietly gearing for a battle in Congress to provide the Navy with more and better ships. Committee Chairman L. Mendel Rivers (D-S. C.) has been stumping for a more modern Navy and, in particular, for more nuclear-powered, Poseidoncarrying submarines. The feeling on Capitol Hill is that if the Navy does not request the ships, the House committee will add them to the

~ INFORMATION RETRIEVAL NUMBER 2 6

authorization bill anyway. No new carriers are expected; the emphasis will be on submarines, anti-submarine warfare vessels and missile-carrying surface ships.

Airlines continue attack on FAA's efforts in R&D
The Air Transport Association, continuing its assault on the Federal Aviation Administration's R&D efforts as largely irrelevant to airline needs, says now that while nearly all American airliners are equipped with code transponders and "perhaps half our fleet is transmitting automatic altitude reporting information, only two [FAA] operational facilities in the United States can use the altitude information." The rest of the time, the association says, "we transmit altitude data to nobody in particular."
Lockheed still heads Defense Dept. contract list
Despite all its financial problems with Government contracts in the last year, Lockheed, for the second year in a row, is the No. 1 defense contractor in the nation. It received $1.84 billion in Defense Dept. procurement awards and $526-million in R&D work in fiscal 1970. Ranked behind Lockheed are General Dynamics, General Electric, AT&T, American Rockwell, Grumman, Litton and Hughes Aircraft.

NASA to test uhf satellite for air traffic control
NASA's Applications Technology Satellite-F2, scheduled for launching in 1973, will carry, along with other equipment, a uhf transponder in the 1,500-to-1,700-MHz frequency band to test absolute and relative accuracy in fixing aircraft positions and the possibility of using satellites for twoway communications between the ground and multiple aircraft. The airlines and the Federal Aviation Administration want a hybrid satellite with vhf and uhf capability, since U. S. airlines use vhf equipment. NASA and European airlines and governments favor the uhf satellite.

Capital Capsules: The National Bureau of Standards has "cleared" a dozen or more
makes of microwave ovens it has been testing for possible radiation hazards. The main cause of excessive radiation seems to be just plain old dirty ovens, with resultant improper sealing. . . . The Federal Aviation Administration has awarded a $1.02-million contract to IBM's Federal Systems Div. for software modifications at 20 air traffic control centers. . . . Slowdowns and cutbacks in the Apollo program have led NASA to close down three ground tracking stations and to retire three tracking ships and four tracking aircraft in the last year.... Microwave Communications of America, Inc., says it hopes to begin microwave data communications service in February between St. Louis and Chicago. MCI wants to sign a contract with AT&T for local interconnections for its customers. . . . NASA is investigating an allegation by the General Accounting Office that Boeing overcharged NASA $2.7-million on Apollo Saturn 5 booster work and thereby made a $695,000 profit it shouldn't have. In another case, Boeing's $321,000 contract with the Federal Water Pollution Control Administration for computer time-sharing is being protested by other bidders who contend Boeing is using its private company phone system to move the data in violation of FCC regulations.

EL ECTRONIC DESIGN 25 , December 6, 1970

Tektronix

· · ·

· · · · · the valued plug-in concept

The New Tektronix 7000-Series Oscilloscope System does more of what a plug-in oscilloscope is intended to do. With four-plug-in flexibility, and new operator convenience, you make more measurements with fewer errors and less effort.
Four-Plug-In Flexibility
Tektronix single and dual plug-in oscilloscopes proved the value of the modular approach to solving measurement problems. Now the added ability to simultaneously use multiple plug-ins-with similar or widely different features-makes the plug-in concept even more valuable. Tektronix 7000-Series Oscilloscopes offer bandwidths up to 150 MHz, four-plug-in flexibility, and mainframe versatility, to display more measurement data in a single setup than any other oscilloscope system. Multiple plug-ins minimize the loss of valuable time and the inconvenience caused by having to repeatedly interchange plug-ins to solve a measurement problem. If you wish, start with only one horizontal and one vertical plug-in and add more as your measurement requirements change.
Wider Performance Spectrum
Some features which widen the performance spectrum of the seventeen plug-ins currently available are : dual trace, 105 MHz at 5 mV/div (four trace, 105 MHz with two units) · differential, 100,000:1 CMRR at 10 µVI div · differential comparator, 100 MHz at 1 mVI div · random or sequential sampling, 25 ps t, (depending upon the sampling head) · two new single-trace amplifiers, 150MHz at 5mV/div ·current amplifier, 105 MHz at 1 mA/div · 500 MHz digital counter · ~nd a digital multimeter that also measures temperature.

L LEFT · .1.t'

ADO

CHOP RIGHT

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.. _
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More Convenience
Convenience is another outstanding feature of the 7000-Series Oscilloscopes. Auto ScaleFactor Readout, a Tektronix exclusive, labels the CRT with time and frequency ; volts, amps, ohms and temperature (C); invert and uncal symbols and corrects the readout for probes and magnifiers. Color-keyed panels, lighted push-button controls, peak-to-peak auto triggering, and trace-identify switches on probe tips and plug-in panels are just a few of the many convenience features which mean faster, easier measurements with fewer errors.

Your Tektronix Field Engineer will gladly discuss with you the complete FLEXIBILITY, VERSATILITY and CONVENIENCE of the NEW 7000-Series Oscilloscope System. Contact him locally or write : Tektronix, Inc., P. 0. Box 500, Beaverton , Oregon 97005. See your 1970 Tektronix Catalog and Supplement for specifications and descriptions of the entire 7000-Series including the NEW 7514, DC-to 90 MHz, Storage Oscilloscope.

Prices of instruments shown: 7704 150-MHz Four-Plug-In Oscilloscope .. . ....... $2500 7A 16 150-MHz Single-Trace Amplifier ............. $ 600 7A14 105-MHz Current Amplifier ... .. . .. . . ....... $ 575 7B71 Delaying Sweep Time Base . . . . . . . . . . . . . . . . . $ 685 7B70 Delayed Sweep Time Base . . . . . . . . . . . . . . . . . $ 600 Blank Plug-In Panel, order 016-0155-00 ............ $ 6

U.S. Sales Prices FOB Beaverton, Oregon

Available in U.S. through the Tektronix lease plan

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FASTEST CAUatU.TtD TIMl/Orv-2 ..

TEKTRONIX®
committed to technical excellence

INFORMATION RETRIEVAL NUMBER 27

ELECTRONIC D ESIGN 25, December 6, 1970

ELECTRONIC 0 ESIGN 25 , December 6, 1970

· · MECL Ill OFFERS THE FASTEST

Picture a computer with limitless storage capacity and instantaneous retrieval. Impossible? Today, yes - but new technologies are providing more rapid access to data, and performance of highspeed memory functions outside the main storage memory are paving the way to the ideal computer. MECL III now introduces three basic memories to meet state-of-art requirements for highspeed buffers and applications requiring rapid storage and transfer of data.
The MC1684 (High Z)/MC1685 (Low Z) Content Addressable Random Access Memory performs the read-write (scratch-pad) function plus the content addressable (interrogate-match) function. In other words, information may be written-in, read-out and the memory may be interrogated to check its contents. Typical read, write and search delays are 2.5-3 ns, 4 ns and 2.5-3 ns, respectively.
The MC1680 (High Z)/MC1681 (Low Z) Random Access Memory is sometimes called a decoded scratch-pad memory. Data can be entered or read out of the memory from either of two words simultaneously. Recommended for ultra-high performance applications, the MC1680/1681 features typical 2.5 ns access times and a write delay of 3 ns. Computer interrogation is speeded through application of the MC1682 (High Z)/MC1683 (Low Z) Content Addressable Memory. Sometimes called an associative memory, the MC1682/1683 features a search (interrogate) delay of 2.5-3 ns and a write delay of 4 ns, both typical values.
As illustrated, the MC1684/1685 CARAM and MC1680/81 combine to form a very high speed buffer memory. When a word is required from the mass storage memory, it is placed in the RAM portion of the buffer for future access. The word's address in mass storage is placed in a content addressable memory tied to the random access section thereby allowing words to be addressed by their mass storage location in one cycle time of the buffer memory.
As the address of the desired word is presented to the content addressable section, the CAM will indicate (in one cycle time) if the address is in the CAM and if the desired word is available in the buffer. If the word is present, the desired read and/or write function can be performed at buffer RAM speeds. If the word is not present it must be brought from the slow mass storage through 'push-down pop-up" techniques. Through the use of the CAM/RAM Buffer Memory, the effective access time is a function of the memory access sequencing and not the mass storage access time.
For further details on these high-speed memories write to Motorola Semiconductor Products Inc., P . 0. Box 20912, Phoenix, Arizona 85036. Evaluation devices are available at your nearby Motorola distributor. MECL III provides the fastest memory functions available today. Design in and THINK FAST!

EL ECTRON IC D ES IGN 25, D ece mbe r 6, 197 0

It\ MOTOROLA MECL
W the only way to go . .. FASTER
INFORMATION RETRIEVAL NUMBER 28
49

Our 5000 and 7500 permeability Ceramag®ferrite materials can pack aterrific amount of inductance into asmall size.

And the higher the perm, the fewer turns required. Results. Lower distributed capacity. Material savings. Improved performance.
Cera mag® 24H offers the designer a true 5000 permeability. New, Cera mag® 24K is also a true 7500 permeability. Both materials hold their permeability over a wide range of sizes.
Ceramag® 24H and 24K are production materials, ready for immediate use in your design. Stock available in some sizes.
Precisely engineered, Stackpole ferrite materials are produced by exact processing, density checks, rigid kiln controls and accurate sintering. You get more out of Stackpole Ceramag® materials simply because we put more into them .
Study the characteristics of 24H

NL2 (nh)
TOROID SIZE: 0.230" 0.0. 0 .120" 1.0. 0.060" L.

CERAMAG® 24K
CERAMAG® 24H

1485 990

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(e)
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TEMPERATURE COEFFICIENT OF /Lo

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to
25° c.

25° c.
to
75° c.

+1.000 -0.450

+0.700 -0.450

2500 PERM REFERENCE

495

and 24K, then consider how you might use these ferrites.
For more information, samples and applications, contact:
Stackpole Carbon Company, Electronic Components Division, St. Marys, Pa. 15857. Ph: 814· 834-1521. TWX: 510-693-4511.

Disaccommodation factor for both materials is 1.4 x 10·6, typical.

Producing high quality Ceramag® components for the home industrial electronics industries for over

ferrite entertainment, o and computer
twenty-two years.

INFORMATION RETRIEVAL NUMBER 29

INFORMATION RETRIEVAL NUMBER 30 ....

General Electric Al 1181(11 ·Al~till&ll

respond instantly* to give you voltage that is constant...

c . ant., cons , t

., con~ , cons a , c n

stant, constant, consta t ...
Send in this coupon for free bulletin giving complete details on G E AC Voltage Stabilizer features, ratings and application data; or sec JOUr GE sales representative toda~· ·
· Output \Olta~c b C\t;ihilized 1n )l.',~ than 2 cyc l eC\ fo r t ra n.., ient l i ne tlro p of 30%.

· ············································ Scl'lion 413-35 General Elel'lric Company Schenectady. New York 12305
Please send me free bulletin GEA-7376 on AC Unc \'oltage Stabilizers. NAi\IE _ _ _ _ _ _ _ _ _ _ _ _ _ __
COMPANY _ _ _ _ _ _ _ _ _ _ _ _ __
TITLE _ _ _ _ _ _ _ _ _ _ _ _ _ __

GENERAL. ELECTRIC

ADDRESS _ _ _ _ _ _ _ _ _ _ _ _ __ CITY _ _ _ _ _ _ STATE _ _ _ _ l.IP_

Wl,Hllll THEERIEORBIT···

Throughout the free world in airborne armaments, guidance, communications and navigational systems, there are more types and quantities of Erie components and assemblies than we can possibly enumerate.
An important addition to this range is the broad band filtering specifically developed for the protection of armament systems from electromagnetic R.F. interference in the HAWKER SIDDELEY "HARRIER" VTOL JET in service with the R.A.F. The filtering for this aircraft was custom designed by our Erie England engineering and manufacturing groups. Similar and equally important filtering against RFI is accomplished by our North American facilities for numerous USA type aircraft.
Just another example of the filter devices used the world over in aircraft, spacecraft, ships, land vehicles and static installations. Would you like to find out why? We will g l a d l y - - - - - - - · send you a brochure. Write to Sales Engineering Dept., Erie Technological Products, Inc., 644West12th Street, Erie, Pa. 16512.

ERIE TECHNOLOGICAL
PRODUCTS, INC
Erie, Pennsylvania

INFORMATION RETRIEVAL NUMBER 31

INFORMATION RETRIEVAL NUMBER 32 ...

CLARE HGJ RELAYS

shatter industry standards

r-
~.
N ,
"I .

I I I

' l

, I I

Compare the new Clare HGJ Relays with any other mercury-wetted contact relays. You'll get more speed, less noise, and less jitter-in less space than any other! Take your choice: 0.340" profile for true halfinch pcb spacing, 0.400" profile for higher sensitivity. Single-pole HGJM, two-pole HGJ2MT. Both are capable of switching low level to 2 amp max, 500 v max (100 va max, ac or de).

~ less jitter
At drive frequency of 250 Hz, HGJ jitter=50 µs.
- HGJ - 1 ndustry standard
For full information, circle the Reader Service Number.

Norn . oltage
~faster response
At nominal voltage, HGJ response time= 1 ms.

e RE c. P. CLARE & co.

Chicago 60645 and worldwide.

A General Instrument company.

Keep your power dry

Dow Corning®silicone molding compounds and four organic plastics were tested under identical conditions-93% relative humidity at 70C for 5000 hours. The organic plastics absorbed nearly five times as much moisture as the silicones. Moral: silicones protect your power devices from galvanic corrosion. Other advantages of silicones include
54

superior resistance to thermal shock, cracking and burning. No derating is necessary, the initial cost is low, and you get faster production because of good mold release and minimum flash. Dow Corning silicone molding compounds are a genuine bargain that can improve your product and save you money. Our new booklet gives complete details on Dow Corning silicone

molding compounds. For your copy, write Dow Corning Corporation,Dept. A -9343 ,Midland, Michigan 48640.
Electrical I Electronic
materials from
DOW CORNING
1"'!113'h41/!I

INFORMATION RETRIEVAL NUMBER 33

ELECTRONIC D ES IGN 25, December 6, 1970

The compatible DATA-PAC familypresents Analog Interface Modules.

Count on high precision in your data acquisition

completely prewired connector plane, will

systems with Analog Interface Modules-

"plug-in" to your data acquisition subsystem.

AIMs. They offer a complete capab~. l~ity~:~~~!!!~:li A-to-0, D-to-A, multiplexing,

AIM products offer accuracies as high as ±0.015% at speeds as fast

sample-and-hold buffering and

as eight microseconds, with up to

compatibility with DATA-PAC

256 single-ended or 128 differen-

core memories, logic modules, ·~,,

tial input channels. AIM products

minicomputers and '' 1

· ;' ·are supported by applications know-

hardware. Eight, ten and

i' how. The ability to interface with your

thirteen-bit A-to-0 and

needs is here. Learn more about Al M

corresponding D-to-A

products by writing Honeywell Information

converters, configured to your

Systems, MS 261, 200 Smith Street, Waltham,

system needs and installed in a

Massachusetts 02154.

The Other Computer Company:
Honeywell

INFORMATION RETRIEVAL NUMBER 34

HONEYWELL INTERNATIONAL-Sales and Service offices in all principal cities of the world. Manufacturing in Australia, Canada, Fin land, France, Germany, Japan , Mexico, Netherlands, Spain, Taiwan, U.K. and U.S. A.

Lamination land.

Located at Arnolds Pacific Division.Where precision plus quality plus experience go into every lamination.

You've come to the right place when you come to us for precision-stamped or chemically etched laminations, lead frames, and other precision parts. Whether you want to use them in motors, transformers, recording heads, integrated circuits, or similar devices.
We maintain our own facilities for both stamping and· photo-chemical fabrication. And our own tool-and-die shop. So we have total control

of quality-from melt to finished part-to keep dimensional tolerances to a minimum and develop magnetic properties to a maximum. In our standard laminations made from silicon steel, 4750 nickel-iron alloy, and 4-79 Mo-Permalloy. And in special lamination configurations and lead frames made from more exotic materials.
Tell us what you need. Call or write today.

The Arnold Engineering Co.,Pacific Division, Dept. H, Fullerton, Calif. 92631·(714)871 -1560 ·Member Company of Allegheny Ludlum Industries· Branch Offices and Representatives in Principal Cities

INFORMATION RETRIEVAL NUMBER 35

ELECTRONIC DESIGN 25 , December 6. 1970

Bot Hews!
THeFlr&T
Mono·
lithic

OTHER 1501 FEATURES Input voltages to :±:30V Output currents to lOOmA (:±:5 amps with external transistors) Adjustable current limiting Less than 1% temperature drift
Single reference T0-100 and DIP versions in military and commercial grades
SQ 1501 DUAL·POLARITY TRACKING REGULATOR
"·
"·
GROUND
"·
"'

Tracking Regulator
... the Silicon General 1501! That's right, positive and negative outputs from one regulator ... factory set at :±:15V or variable from :±:8V to :±:23V with a single external adjustment. .. balanced to within 1% (outputs typically track one another within 50mV!) ... line regulation of 3mV ... load regulation of 5mV.
The 1501 makes distributed, or on-card, regulation a practical reality by cutting component count and cost. This single device, priced from $4.80 to $9.80 (100 pcs.). will power over 25 op amps. Call or write for more data. Silicon General has all the good regulators: SG1501/2501/3501, SG100/200/300,SG723/723C,SG105/205/ 305 and coming soon: the SG109/209/309 and SG104/204/304.
JUST ANNOUNCED MORE NEW HOT LINEARS FROM THE HOT SOURCE!
SGl 10/210/310 SG1595/1495 SG102/202/302 SG1596/1496

FOR IMMEDIATE DELIVERY, CAU YOUR SILICON GENERAL DISTRIBUTOR

9·1L·1con GenereL i ~~i~~;g~~:~T.(I~~~)8396200 ~...Ir. 7382 Bolsa Avenue, Westminster, California 92683
SILICON GENERAL DISTRIBUTORS: ARROW ELECTRONICS, INC. -Ohio 216/464-2000, 513/253·9176, BODELLE COMPANY, INC. - Chicago, 111. 312/468-1016, INDUSTRIAL COMPONENTS, INC. - Minneapolis, Minn. 612/ 927-9991, INTERMARK ELECTRONICS -San Carlos, Calif. 415/592-1641, San Diego, Calif. 714/279-5200, Denver, Colo. 303/936-8284, KIERUL1F ELECTRONICS - Phoenix, Ariz. 602/273-7331, Albuquerque, N.M. 505/2471055, Palo Alto, Calif. 415/968-6292, San Diego, Calif. 714/278-2112, Denver, Colo. 303/343-7090, Seattle, Wash. 206/763-1550, K·TRONICS/WESCO - Los Angeles, Calif. 213/685-9525, GREENE-SHAW COMPANY, INC. - Newton, Mass. 617/969 -8900, HARVEY RADIO COMPANY - Woodbury, L.1 .. N.Y. 516/921 -8700, N.Y., N.Y. 212/582-2590, Clifton, NJ. 201/473-8558, OSSMANN COMPONENT SALES CORP. - Rochester, N.Y. 716/422· 3290, PYTTRONIC INDUSTRIES, INC. - Baltimore, Md. 301/539-6525, Cheverly, Md. 301/322-3740, Montgomeryville, Pa. 215/643-2850, Philadelphia, Pa. 215/242-6700, Pittsburgh, Pa. 412/931-0915, Harrisburg, Pa. 717/ 233-6591, Raleigh, N.C. 919/833-7552. REPRESENTATIVES: ALA 205/772-9237, ARIZ 602/253-6104, CALIF 213/945-2341 , 415/349-1266, COLO 303/798-8439, CONN 203/239-0212, FLA 305/622-1468, 305/622-1730, ILL 312/286-1500, IND 317/359-9283, 219/432-5591 , 317/453-6868, IOWA 319/362-8155, MD 301/825-0001, MASS 617/862-8230, MICH 313/342-3242, MINN 612/927-9991, N.M. 505/268-3941, N.Y. 716/442-3290, 914/338-5505, 315/454-4477, 607/785-9949, N Y CITY 516/741 -8966, OHIO 216/241-4880, 513/298-0662, PA 215/248-3377, 412/922-3890, TENN 615/968-4195, WASH 206/767-4330. MONTREAL 514/735-5775, HASSELT Tel: 011-25467, COPENHAGEN Telex: 2771 , PARIS Telex: 62.630 F, MUNICH Telex: 05-22-106, ATHENS Tel: 727-719, TEL-AVIV Telex: 033-638, MILAN Tel: 639-751, GENNEP Telex: 45239, STOCKHOLM Telex:
08/ 756-65-53, ZURICH Telex: 52028, LONOON Telex : 24443.

INFORMATION RETRIEVAL NUMBER 36

ELECTRONIC DESIGN 25 , December 6, 197 0

When it comes to mating, we don't take a back seat to anyone.

Maybe you're one of those designers for whom mating hasn't changed much these last few years. You really don't require any of that fancy, sophisticated stuff. For you, standard quickconnects are still the best.
We haven't forgotten you. We know what you like. And we've got them. A whole line of quick, efficient, reliable mates. We call them AUTO-MATES. Because that's just what they do. Mate automatically.
Malco Auto-Mates include quick-connect crimp-type wire connectors, flat blade receptacles (Tabons®), pin receptacles (Pinons), wrapost receptacles (Wrapons), rectangular wraptails,
58

solderless ring and spade terminals, strain reliefs and a complete array of printed circuit hardware like pins and wraposts.

Malco also has a complete line of automatic crimping machines. They'll crimp receptacles, insulating sleeves, pins and connectors.

To make it even easier for you, Auto-Mates are available in chain form for automatic crimping to all types of lead wires. And if you 're really pressed for time, Malco will automatically insert your P.C. wraposts or pins to your specifications. That's all part of the Auto-Mate package.

Of course, if you prefer, you can still do it by hand. We wouldn't want to crimp your style.
We solve your mating problems.
1111

mALCO

mALCO mFG comPAnY
5150 WEST ROOSEVELT ROAD CHICAGO, ILLINOIS 60650 ( 3121 2 8 7-6 7 00

inc

Get the goods on Auto-Mates. Send for your free copy of Malco's book:
Auto-Mates. A Guide To Good Old Quick-Connects.

INFORMATION RETRIEVAL NUMBER 37

E L ECTRON IC D ESIGN 25, D ece m be r 6, 1970

NO CAPACITOR MANUFACTURER OFFERS EVERY CERAMIC STYLE IN MIL-C-110150 OR MIL-C-39014 ... BUT ...

Aerovox has more QPL's than anyone else!

That's right ... Aerovox is on the QPL for more approved ceramic capacitors than any other ceramic manufacturer in the industry. By way of comparison, Aerovox can supply over 76% of the parts approved to MIL-C-110150 while supplier number two can supply only 71 % , and supplier number three can provide only 42% of the approved parts. Is it any wonder then that more and more manufacturers turn first to Aerovox when they have a requirement for ceramic capacitors to meet MIL-C-110150 and MIL-C-39014.

For Mil-C-39014 Aerovox is approved to "R" level and "S" level approval is expected in early 1971.
And if you are looking for firm delivery schedules and not promises, you've discovered a second good reason for making Aerovox your first call-out on prints and specs for ceramic capacitors. Fact of the matter is, no matter what your capacitor requirement is ... check first with Aerovox ... you'll be more than pleasantly surprised with our prices and delivery schedules.

1~\vh:< Aerovox®

AEROVOX CORPORATION, NEW BEDFORD, MASSACHUSETTS 02741 · TEL . 617 - 994 - 9661 PLANTS IN : NEW BEDFORD, MA., OLEAN & FRANKLI NVILLE , N .Y., MYRTL E BEACH , S.C. AND HAMILTON , ONT., CANADA

INFORMATION RETRIEVAL NUMBER 38

ELECTRONIC D ESIGN 25, D ecem be r 6, 197 0

INFORMATION RETRIEVAL NUMBER 39

ELECTRONIC DESIGN 25, December 6, 1970

OUR ANGLE: angle position indicators that do more and cost less
SHOULDN'T YOU TAKE A NEW READING ON THIS COST-PERFORMANCE ANGLE?
For better ways to measure synchro and resolver data, North Atlantic offers the best of both worlds: budget prices for the popular APl-8025; superior performance and increased capability of the new 8525. · Both are interchangeable without any mechanical or wiring modifications. North Atlantic's solid-state 8525 offers an accuracy of 0.05° (3 minutes). Following a 180° step input, it synchronizes a five-digit
NIXIE readout in Vi second flat. And
it tracks at up to 1000° per second. Where cost can be traded against performance, the proven electromechanical APl-8025 . . . a recognized indus-
ANG, f P0;:,1T10N 1N<.llCATO!!
I 6 9 .74

try workhorse . . . is available with its 6 minute accuracy, 25 ° / second slew speed, and many options. · Input of the 8525 is any 60 or 400Hz resolver/ synchro data from control instrumentation . The patented servo design elimi nates all inertia and improves dynamic performance many times over. Its digital outputs are especially suited to the computer-oriented requirements of today's automatic test systems. The 8525 . . . priced at $2475 . . . and the APl -8025 priced at $995 actually cost less because they perform more functions per dollar. And with greater reliability.
For complete inf ormation on the cost-performance angle, please write or phone now.

NORTH A.TLA.NTIC
industries, inc.

200 TERMINAL DRIVE, PLAINVIEW, NEW YORK 11803 cable : noatlantic / twx : 510-221-1879 / phone : (516) 681-8600

INFORMATION RETRIEVAL NUMBER 40

ELECTRONI C D ESIGN 25, D ecember 6, 1970

REED SWITCH SPEEDS

WITH NO

CONTACT

BOUNCE.

~ actual size.

Hamlin's miniature,
mercury-wetted switches offer all the advantages of high-speed, reed
switches with the low contact resistance and high-power capacities of mercury switches. Precise, "on-off"
actuation makes
mercury-wetted switches ideal for applications where contact bounce
cannot be tolerated . Available in form A
(100 VDCJ and form C
(28 VDCJ. Useable length as low as . 835~' Write for
catalog . Hamlin, Inc., Lake Mills, Wis. 53551 . Or call 414/648-2361.

NA. . · I · INCORPORATED
-~~~~~~IN:F~O~R~M~A~Tl~O~N~RE~T~Rl~E~V~NI
Al NUMBER 191

20 MILLIWATTS KEEP YOU

IN CONTROL

WITH

T.M.

CONTROL-PAK.

Solid state control handles up to 25 amps but ca_n be controlled by J.C. logic input ... without amplification . And it's fastoperates in a millisecond, releases within ~ cycle. No noise-electric~I or acoustical. Zero sw1tchJine for minimum EMI and
RFI. It's completely encapsulated; immune to environment and shock-
resistant. Controls all types of loads with
reliable, arcless operation. Never.needs maintenance. Write for
catalog. Hamlin Electronics, Inc., 3066 West Clarendon, Phoenix, Arizona 85017. Or call, 602/277-4834.
l

MAM·I· ELECTRONICS, INC.

INFORMATION RETRIEVAL NUMBER 192

YOU PAY FOR RELIABILITY IN

~----

HAMLIN REED SWITCHES.

JUST ONCE.

The cost difference between a Hamlin reed switch and another of comparable rating is pennies-sometimes just mills. And it pays off. A switch failure may go unnoticed until it's too late. Then the cost of a malfunction is probably hundreds of times the cost of Hamlin reliability.
I
Rhodium contacts, for example, precision assembly in white room conditions, the industry's most effective hermetic seal, rigid electrical inspection on a 100% basisthese are the things that will make you glad you specified Hamlin reed switches, even after 50 million safe, dependable closures. And you can choose from nearly 2,000 models, from 660 watt capacity down to a 3/10 watt, "grain of wheat" size. You get Hamlin reliability in every one and you pay for it only once. Write for free evaluation samples and catalog. Hamlin, Inc., Lake Mills, Wisconsin 53551 . Or call 414/648-2361 .
..~..··INCORPORATED 62
INFORMATION RETRIEV Al NUMBER 193

E LECTRONIC

D
ES l G N

' ecember 6, J970

Varadyne D/A and A/D
eonverters. In volume. In stoek. Now.

(Single Quantity)

SPECIFICATIONS

ELECTRICAL

Diallal Inputs

Resolution · . · .

. 8 blnar)' bits or 2 dlait BCD

Codln1 ....·.. . .·.. Parallel data In the follow Ina formats :
~~~11ht binary i~~!~\:~ ~lg~U

output current ... .. .. . ± 5 ma
0 1 Ouqiut loadin1 · · · · .. · ·~~ ~~:~~~rf~rt~~JD~:pu~r,u~ parallel with 1000 pf output settln1 t1m1 . 20 µsec to ± 0.2% of FS (typ.)

Data Inputs

or Two's complement (blpolar output) Output vo1ta11
.·. DTL TTL compatible, positive logic . rtsolutlon · · · · · · · ·

· ~om~v1~~,e~~f.~{"3t{, bits

Loading : one standard TTL load
= IL mu. 1.6 ma @ VIN = 0.4V

lln11rlty

. · ·. ± 112 LSB

T1mper1tur1 coefficient ± 50 pp mr e of FS

1 Update rate ........ ~~rt~JY:~c:~t:~tt ..v~l~~f~~~~~1~ ti me
Analo1 output <@2s·c1 ACCUrlCJ . , · . , . , · , ± 0.2% of FS ±Vl LSB
Output wo1ta1e . . . . ·o to + lOV FS (connect Pin 15 to
Pin 14)

Loni term stalllllty . ... ± 0.05% / YR

Reference source · . .·. Internal

Input powar requirements . .. . ····. ± lSVDC @ ± 20 ma

Op1rat1n1 temperature r1n11 . ...··.·.. . ..·. o·c to + 1o·c

Stora11 temperature ran11 . . · . .

. .. ss·c to

+BS"c

Sill ......... . ..... 2" lx2" Wx0.4" H ptuc-ln module

± SY FS (connect Pin 15 to Pin 13) W1l1ht ...·...... . .·. 2 oz.

SPECIFICATIONS

ELECTRICAL

Inputs :

Performance :

Analoc Input wolta11

Resolution

ranae · · · · · · · · · · · ~s~ F1 ~~rn F;2<R~~~rn~fmn!~ on ly

. . ·One part In 2" (resolution 8
~~n!:~~~~e0:;, i11~1!r~~?ls>

Input Impedance . . .. SK ohms shunted by 10 pf

Outputs :

Paralltl output data .. Up to 8 parallel lines of data held until next conversion command
Vout {"O" ) < +o.av Vout ("I ") > +2.4V
~:ct~ iu~~t 1 ~!~:blt of drlvtn1

Codlna . .

.. StraiJhl binary (unipolar input)

~1!~·,t

:i~~r~uXf:~r;r

1 i':fs>uutl>

End of Connrslon .. . Conversion status si1n1I .
~g::_tpf~~ ') < +a.av Conversion

Vout ("I")> +2 .4V durln1 convers ion loadln1 up to 6 TIL IG1ds

AccuracJ . .

· ± 0.2% of FS ± Vl LSB

Loni term stability. . . . ± 0.05%/YR

Temperature co1ftlclent .. ± 50 ppmr c

£ncodin1 time .·. . .. .. ·. 8 binary bits - 200 µsec total 2 di&it BCD - 100 µsec total

R11dln1Rate

. . 8 binary bits - 5000 samples/

sec. max.

2 digit BCD - 10,000 samples/

sec. mu.

Input Power Requirements .

§20 . .. + lSVDC, ± 0.5VDC

+15svvooee,. ±±0o..5sVvDoCc

12 ma 75 ma

Operatln1 temperature

r1n11

.·. 0 ° to + 70°c

Stor111 temperature

ran11 . . .

. . . ..... 55"c to 85°c

Slt1 . . . . . .

. .. . 2" W x 3" L x 0.4" H

Weicht

...... 4 oz. max.

ORDERING INFORMATION: DAC-29- SB - S BINARY BITS SD - 2 DIGIT BCD

ORDERING INFORMATION: ADC-S9- SB - S BINARY BITS SD- 2 DIGIT BCD

36 OTHER A/D AND D/A MODELS TO CHOOSE FROM. WRITE FOR OUR FREE 24-PAGE CATALOG.

VAR.A.DYNE

S " Y ' S I E 1'-/1 S 1020 TURNPIKE ST., CANTON, MASSACHUSETIS 02021 · (617) 828-6395

O I Vl'ilO N

VARAO'f N E

INC

INFORMATION RETRIEVAL NUMBER 42

ELECTRONIC D ESIGN 25 , December 6, 1970

Solid state, for 1000x reliability.

Genistron, for high-amp ratings.

Get it all. The whopping improvement in cycle life th at sol id state relays switch on : 100- million operations vs. 100,000 from horse-and-buggy EM . Plus the fullest range going in high-amp sol id state . All the way to
40 amps- twenty more than the nearest competition .
Up through 240 Volts AC, 40 VDC, Genistron isolated SSR's are fully encapsulated for ruggedness . With barrier-strip screw-type terminals for easy connection s. And our AC Syncroswitch Relay has zero-axis switching to eliminate RFl.(Just what you 'd expect from the same people who bring you Genistron EMI filters .)
Catalog and specs, yours for the asking . Call or write Genistron Solid State Relays, Genisco Technology Corporation, 18435 Susana Road, Compton, California 90221 . (213) 774-1850 .

GENISTRON SOLID STATE RELAYS

INFORMATION RETRIEVAL NUMBER 43

EL ECTRON IC D ESIGN 25, D ecembe r 6, 197 0

editorial
Air-pollution market?
Caution required.
The air-pollution market for el.ectronics is small, but it's due to grow swiftly. Spending for air-pollution sensors alone should total $500-million over the decade of the 70s, according to H. J. Hall, r.esearch associate with the Esso Research and Engineering Company. But this may not b.e the golden opportunity for the electronics industry that the raw figureg indicate.
There are 15 classes and 48 subclasses of air pollutants that are of int.erest in antipollution studies, according to Essa's Government Research Laboratory. In the order of 50 new t ypes of sensors will be needed, and this means perhaps 50 different design and development jobs.
If we divide th.e $500-million total spending estimate by the number of years in the decade and then by the number of different instruments required, we arrive at a disappointing average yearly mark.et of $1-million for each type. Certainly, the spending for some types of sensors will far exceed this figure, but for many th.e markets just won't be large enough to justify the research, development and marketing costs. From the viewpoint of private industry, therefore, the air-pollution market must b.e approached with decidedly cautious optimism.
Government funding for necessary R&D will, of course, be available. The ational Air Pollution Control Administration estimates its poilution abat.ement and control spending for 1970 at $35-million, and plans to spend $40-million in 1971. The contracts involved are a very real profit opportunity for companies with the required technical expertise.
But we mustn't be too optimistic here, eith.er. A few Government contracts don't mean booming sales for the industry. Recall that the National Institutes of Health and the Department of Health, Education and Welfare have both fund.ed work in medical electronics for years, and only a very few companies have developed significant saleg volumes in the medical field.
Yes, the air-pollution-control market may use $500-million worth of .electronics in the 1970s. Opportunities exist, money will be spent, and the possibilities must be investigated. But the development costs in many instrument areas could eat up the potential profits and more. Approach with caution!
RAYMOND D. SPEER

ELECTRO IC DESIGN 25, December 6. 1970

cover feature

Separate the signals from the noise
with this simple voltage correlator circuit.
It costs only $100 in parts-yet analyzes complex signals.

Correlation techniques offer a powerful means of extracting low-level signals from noise and for analyzing the frequency spectrum of compl.ex ac signals. But too often correlation methods require expensive, sophisticated test equipment or general-purpose analog computers.
Not anymore! With today's low-cost amps and multipliers, many of these instrument and computer techniques are practical for use in system design.
A basic correlator circuit can be designed with a component cost of around $100. The simple circuit described here uses only two multipliers and two op amps.
Here's how it works
The output of the correlator circuit shown in Fig. 1 is the in-phase component of the input signal. The circuit rejects the harmonics and quadrature components and is independent of the magnitude of the reference signal.
The output, E 0 , can be determined from the closed-loop operation of the circuit. The first multiplier, M,, has an output of
E 2= 0.1 (A sin Wet) ( - E, + E o).
Since most commercially available multipliers have a built-in gain of 0.1 this value is used for both multipliers in the correlator circuit.
If the integrator time-constant is large rel~ tive to the frequency range of interest, then the output of the integrator will be a de level. The loop feedback wiJI cause the output of the inte-
grator, E:,, to vary in de level until the de average
of E " goes to zero. The output of the second multiplier will be
E o= 0.1 E 3 (A sin w,.t). To best understand the operation of the circuit, consider the case where the input is some periodic signal with a frequency of w, and zero de value. Then this periodic signal can easily be described by the simple Fourier series
Edited by: Steven A. Erenburg, Microelectronics Editor
Tom Cate, Product Marketing Engineer, Burr-Brown Re· search Corp., International Airport Industrial Park, Tucson, Ariz. 85706.
66

(anCOS '2Jn7:T'

.
Sm

'2nj7T'

t),

n=l

where

i IE,2'...

an=

(t) cos 2~7T tdt,

-·r

and
.T,

-T

In another form,
E , (t) = B cos 0 sin w.t
+ B sin 0 cos w.t + Harmonics,
where B cos 0 sin w.t is the in-phase component, B sin 0 cosw.t is the quadrature component and
w. = 27T/ T.

The reference input is A sin wet. From the

previous discussion,
E " = 0.1 (A sin Wet) ( - E, + 0.1 E , A sin wet).

In the steady-state condition the average

value of E 2, E z = 0.

t E 2= { - [0.1 A sin wet] [

(a ncos nw.t

n=l

REFERENCE

A sin Wet RI

INPUT
E,

1. Only two op amps and two multipliers are required for this simple correlator circuit. Harmonics and quadrature components of the input are rejected; only the in-phase component appears as an output signal.
EL ECTRONI C D ESIGN 25 , December 6, 1970

x.----'----.
Ez

+15V

IOO

MULTIPLIER 4094/~C

4 l"--_'VV\,....-"""'"-t
z

E3 OUT

+15V

.,,,.

OUTPUT

MULTIPLIER

y 4094/15C 2

.,,,.

-15V

"":1_____.

-15V~YIM'UT OFFSET

-15VO

OUTPUT OFFSET
'·¥. 0+15V 50k

-15V

50k~t----'

- 15V

OUTPUT OFFSET

YINPUT OFFSET

+15V -15v~;o-.. -0

2. The input and feedback resistors of the first op amp must be closely matched for high loop accuracy. Lineari ·

The average value of the first term is zero for
all w. except when w. = We. Then the average
val ue of the first term is

_ ~( ~ ) = _ ~ (B cos0)

10 2

where w. = We.

The average valu.e of the second term is

(1 / 200) (A2Ea).

Now if E; is to be zero, then we must have - (1 / 20) AB cos 0 + (1 / 200) A2 E a = 0.

Solving for E a,

E a = 10 AB = COS 0 for Ws We.

The output of the second multiplier is
! E o= ( cos 0) (A sin Wet).
= Note that E o B cos 0 sin Wet for We = w. and = E o 0 for We ¥= W5 ·

A sin wt
REFERENCE OSCILLATOR

CALIBRATED A"" 1w 1± 9o·+a1 PHASE-SHIFTER -90°<0<+90°
CORRELATOR Eo
CIRCUIT

SYSTEM UNDER
TEST

e sin(WI +81+ NOISE
+HARMONICS

3 . A simple phase shifter is all that is needed to measure phase angles. The output of the correlator is nulled when a = 8. The sensitivity of the nulling circuit, not accuracy, is affected by the amplitude B of the signal.
ELECTRONIC D ESIGN 25, December 6, 1970

ty and offset characteristics of the multipliers are more important considerations than the gain accu ra cy.
In the design of the correlator circuit, any reasonable value of R, may be used. But it is very important that the R,s be accurately matched. A typical value for R1 would be 10 kn, with a matching accuracy of ±0.05 %.
The gain accuracy of multiplier M, is not important, but the linearity and offsets are. A complete circuit is shown in Fig. 2. Linearity is
typically ± 0.5 % for the 4094/ 15C multiplier, and
the offsets may be easily trimmed externally. Ampifier A ; acts as an integrator. The integra-
tor gain, - 1/ RC, directly affects the rate at which the circuit can follow amplitude changes in the fundamental of E,. A large RC means that the respons.e will be sluggish, but the low-pass filtering effect will be better and distortion will be lower. On the other hand, a small RC means that rapid amplitude changes in E , can be followed and the loop-gain will be high, thereby improving gain accuracy. The best value of RC depends upon the particular application.
The output is not dependent upon the magnitude of the carrier, but the accuracy is best if the carrier is 10 sin w,,t volts. This will use the full dynamic range of the multiplier.
Separate in-phase and quadrature
If the input signal is a clean sine wave, but shifted in phase from a reference signal, there will be both an in-phase component and a quadrature component.
If E, (t) = B sin (wt + 0)
= B cos 0 sin wt + B sin 0 cos wt, and the reference input is A sin wt, then
E:, = 10AB ·cos 0 and
67

SYSTEM UNDER TEST
ET +IOV
TRIANGLE -WAVE GENERATOR

E 1lt ) NOISY INPUT SIGNAL

L-i CORRELATOR

r-!

CIRCUIT

1--

Aso n w0t VOLTAGE-CONTROLLED

QUADRATURE OSCILLATOR

A cos WQ I

W· KET

}-REFERENCE INPUT

i - CORRELATOR

L-.-,

CIRCUIT

1--

R
{ > R
R
rl +
~

L---1 LOG AMPLIFIER

-IO IOQ1o ET
HORIZONTAL INPUT

OSCILLOSCOPE DISPLAY

VERTICAL INPUT

4. This two-correlator spectrum analyzer is useful for processing complex signals that contain noise. As the

VCO sweeps in frequency, the amp litudes of the input's harmonics are determineQ and displayed on the scope.

= = - E 0 = B cos 0 sin wt.
In addition, E 4 E 0 - E ,

B sin 0 cos wt.

So, in the steady-state condition, the output E o

is the in-phase component and the first amplifier

output, E ., is the quadrature component, but with

reversed polarity.

Since the output of the correlator circuit is

B cos 0 sin wt, the phase angle 0 can be deter-

mined. If the amplitude of the input is constant,

then demodulating and computing the arc-cosine

will provide a measure of phase angle. On the

other hand, if the reference is shifted by 0 plus

90 °, then cos 0 will be zero.

Nulling the output by shifting the reference

phase by a calibrated amount will also measure

the phase shift 0.

The reference oscillator (Fig. 3) sinusoidal

output is applied to the system under test and

to a phase-shifting circuit. The output of the

correlator is

Since

E0 the

= B cos (0 ± 90 ° cos ( ±90 ° ) = 0,

- a) sin wt. the output will

zero when 0 =a.

Manually adjusting the phase angle a for a null

at E0 will make 0 and a equal. The measurement accuracy is not dependent

on the amplitude of the reference, so simple

phase-shifting circuits may be used. The .ampli-

tude B affects sensitivity, but it also isn't critical.

The system under test may be nonlinear. This

circuit measures the phase shift with respect to

only the fundamental-all harmonics are rejected. The accuracy depends almost entirely on the accuracy of the calibrated phase-shifting circuit.
Build a spectrum analyzer
The correlator circuit can be used as a spectrum analyzer by simply varying the reference input frequency. Harmonic content of a periodic waveform can then be determined.
For manual analysis, a single correlator circuit will generally suffice. But for more generalized spectral analysis, two correlator circuits should be used-one for the in-phase component and one for the quadrature component. These two components may then be summed together, and the spectral analysis won't be dependent upon phase relationships. The two-correlator circuit is generally preferred for complex signals that contain noise.
The triangle wave generator output (Fig. 4) is a sweep voltage that drives the VCO. If the input signal E 1(t) has a harmonic component at the VCO frequency w0 , then the correlator circuits will have an output. So as the VCO sweeps in frequency, the amplitudes of the harmonics are determined.
The log amplifier is optional, but is very convenient for display purposes. The horizontal axis is then the log of frequency. · ·
INFORMATION RETRIEVAL NUMBER 44 ....

Get'em straight
from DamonI

Whether you're in asweat on aVCXO prototype for atough application - or need a production run in a hurry, you can get 'em straight from Damon. Speedy proficiency in design and production of VCXOs allows Damon to deliver all· silicon solid state devices with linearity to within 1% of best straight line and frequency deviation to± 0.25%.
Just glance at the specificati good news on available character designs are available, too. Ask Da VCXOs tailored to your specificatio Call or write: Damon/Electronics Division, 11 Needham, Mass. 02194. Phone: (617) 449-0800.

SPECIFICATION GUIDE*

Parameter

Basic lftd Multlpller VCXOs

Mlx1r and Mixer· Multlpller VCXOs

Center Frequency

1 KHz to 300 MHz

Frequency Deviation

±0.01% to ±0.25% of C.F.

Frequency Stability 24 hr.@ 2s·c

±1 to ± 10 ppm

o to ss·c (no oven) ±10 to ±50 ppm

Linearity

to within 1% of best straight line

Minimum Deviation Rate

o (de)

Maximum Deviation Rate

0.2% of C.F. (100 KHz max.)

Mod. Voltage (Typical) ±5 V peak

Mod. Input Impedance >SOK ohms

Output Power Available 0.5 mw to 20 mw

Load Impedance

50 ohms to 10 K ohms

Power Reiulrements (Typical

-25 v ±1 v@ 30 ma

C.F. Manual Adjustment Range

±0.01%

100 Hz to 300 MHz ±10 Hz to ±1 MHz
±0.5% of peak deviation
±2% of peak deviation to within 1% of best
straight line O (de)
10 KHz to 100 KHz
±5 V peak >50 K ohms 0.5 mw to 20 mw 50 ohms to
10 K ohms -25 V±l V@
40-50 ma ±5% of peak
deviation

* Obviously, the limits are not absolute. The interrelationship of param-
eters for VCXOs are of such a nature as to permit optimization of any one or more characteristics to satisfy customer requirements.

Shown approximately '¥4 size
cb>DAMON

Compute lead-lag network response.
This BASIC program gives precise results for a general feedback integrator-differentiator.

A computer solution of the gain and phas.e response of an integrator or differentiator network not only gives precise results but it requires · less effort than using Bode plots to get approximate answers. The program given here is written in BASIC, and it can be used on any time-sharing terminal or in-house computer that accommodates this language.
The program is set up, in the interests of flexibility, to solve a general lead-lag network that gives lead, lag, or a combination of both, depending on the component values chosen. Once the parameters of the circuit are entered into the program, the computer yields a complete table of gain and phase over any frequency band.
Network is drift-free
The general network used avoids the stability problems inherent in the pure integrator. The series RC input network and the parallel RC feedback combination (Fig. 1) overcome the integrator's tendency to drift into saturation because of bias current or spurious de inputs. The general network has two breakpoints, but they can be located in such a way as to provide only integration or only differentiation in the frequency range of interest.
From feedback theory, closed-loop gain is given by:
= = G(w) eo/ ei - Zr/ Z i
where the voltages and impedances are functions of angular frequency, w. Zr is composed of R2 and C, ; Z i is Ri and C,. Note that it is assumed that the open-loop gain of the op amp is very large.
At high frequencies, the circuit is an integrator or lag network, at low frequencies it is a differentiator or lead network, in the midrange its . gain is constant. A low-frequency breakpoint occurs when the reactance of C2 equals R2, and

a high-frequency breakpoint occurs when the reactance of C1 equals R,. This characteristic is plotted in Fig. 4, while the equivalent circuits of these operational ranges are shown in Fig. 1.
The program (Fig. 2) is interactive, and it makes no assumptions about the breakpoint locations. Once the program has been entered into the computer the values of Ri, C1, R2, C2 and th lowest and highest values of the frequency range are requested (Fig. 3). Plotting the results can be simplified if the two frequency values are powers of 10.
Lines iOO to 230 in the program request and accept the input data. Line 300 converts frequency to angular frequency, and 310 computes gain in decibels. Line 320 begins the phase computation, Jin.es 330-350 decide whether the phase is leading or lagging and line 360, 380 or 400 print the results. The remainder of the program performs the frequency incrementing as the dummy variable I is stepped from 0 in line 290 to 7 in line 490. The actual incrementing of I takes place in line 420.
With minor variations in the lines that actually compute the circuit performance, this program can easily be adapted to other frequency sensitive networks. ··

Leonard Accardi, Engineer, Kollsman Instrument Corp., 80-08 45th Ave., Elmhurst, N. Y. 11373
70

1. A general lead-lag network (a) has the low-frequency equivalent (b) and the high-frequency equivalent (c). In the low frequency end of the spectrum R, is negligible, and in the high range R2 can be ignored.
ELECTRONIC DESIGN 25, Decembler 6, 1970

100 PRINT"ENTER Rl,OHMS"
110 INPUT Rl 120 PRINT"ENTER Cl,MICROFARADS"
130 INPUT C l~O LET Cl=C/1000000 lSO PRINT"ENTER R2 , 0HMS"
lbO INPUT R2 170 PRINT"ENTER C2,MICROFARADS"
180 INPUT 8 190 LET C2=8/l000000 200 PRINT"ENTER LOWEST FREQUENCY.HERTZ"
210 INPUT L 220 PRINT"ENTER HIGHEST FREQUENCY, HERTZ"
230 INPUT H 2~0 PRINT
2SO PRINT 2b0 PRINT
270 PRINT11 FREQUENCY r HZ 11 ' "GAIN r 08" r II PHASE' DEGREES"
280 PRINT 290 LET I=O 300 LET W=2·PI·L 310 LET K=2o·CLGCCW·R2·c1l/SQRCCW·R1·c1+w·R2·c2> t 2+cw·w·R1· c1·R2·c2-1> t 2))
320 LET Y=90-Cl80/PI l°ATNCW·R2·c2>-Cl80/PI l°ATNcw·Rl ·cu
330 IF Y>O GOTO 3b0 3~0 IF Y=O GOTO 380 3SO IF Y<O GOTO ~00 3b0 PRINT L,K, Cl80-Yl, "LAG" 370 GOTO ~20 380 PRINT L,K,"180"
390 GOTO ~20

~00 PRINT L.K.Cl80+Yl,"LEAD"

UO GOTO ~20

~20 LET I=I+l

~30 IF I=l GOTO SOO

~~O IF I=2 GOTO S20

~so IF I=3 GOTO s~o

~bO IF I=~ GOTO SbO

~70 IF I=S GOTO S80

~80 IF I=b GOTO bOO

~90 IF I=7 GOTO b20

SOO LET L=l.S·L
SlO GOTO 300 520 LET L=2·L/l.S

2. This frequency response program is written in BASIC

530 GOTO 300 s~o LET L=3·L/2 550 GOTO 300

and is interactive in lines 100-230 where circuit val ·

SbO LET L=~·L/3

ues are requested . Most of

570 GOTO 300 S80 LET L=S·L/~ S90 GOTO 300

the computation takes place in lines 300-320 . The re·

bOO LET L=7·L/S

mai nder of the program pro-

blO GOTO 300 b20 LET L=lO·Lf7

vides for output of results .

b30 LET I=O

b~O IF L>CH/lOlGOTO b70

bSO PRINT

bbO GOTO 300

b70 ENO

RUN ENTER Rl,OHMS
739.2 ENTER Cl,MICROFARADS
17.S ENTER R2,0HMS
7200000 ENTER C2,MICROFARADS
7.~7
ENTER LOWEST FREQUENCY,HERTZ 7.01
ENTER HIGHEST FREQUENCY.HERTZ 71000000
3.Data entry (left) is followed by a printout of the results (right) . Only part of the output is given here-the low and high-frequency ends of the spectrum and the phase crossover.

FREQUENCY, HZ
.o~
.as .07

GAIN.DB
-8 . ~758
-b.S389b -3.b2003

10.

23.93S

lS.

2~.001

20.

2~.0223

30.

2~.0321

~o .

2~.0278

so.

2~.017~

70.

23 . 98~7

100000. 150000 . 200000.

-21.271~
-2~.7932
-27.2919

PHASE.DEGREES

91.3S7b

LAG

9l.b9b8

LAG

92.37~9

LAG

17l.H8
17S.1~7
177.277
179.9~2
178.198 l7b.bb2
17~ . 018

LAG LAG LAG LAG LEAD LEAD LEAD

90.3111
90.207~
90.lSSb

LEAD
LEAD LEAD

a z
C>

-20 -t--+-+-i-tt+-~--t~-t--t--t-iH-t+t~~-t---t--t-+-H-+i+-~--t~-t--+--t-t-+t+i~~-+-~+--+-f-+++-++~~+--+--t-+-H-H+-~--t

T90 -l--t-+-t-t+i~~-t~+--t-+-1-t-t+t--~-t~+-+-t-i-t-f-H~~-t~+--t-+-ll-t-t+t--~-t~-t--t--t-t++t+---:::--+......9....;.:.._,_t-1-t+-t++~~1

120 -

i~t ~ 1 J~ LEAD

1--t-++-f+t~~-t---t--11-t-t-~-t-~--t~-t--t-t-i-Hl-tt~~-t---if--l-t-t-H-H-~~t---t--t-l-:;l.o!''T+t-""<"""-t~+--t-t-i-H+f~~~

150-

_..r 1

~ 1eo -t-ttfttt-~-t---t-t-t-t+lftt~-t--lf-t-t-t+lftt:::::::::;_.;..,..+-r1'"FTfH~~t--+-t-i--Hrltt-~-t--t--+-t+ttlH-~~

~to-

1 50 -j--t-t-+-t++-~-+~+--t-+-i-HH+~-~ --t~ ~+~.,.....,,..+t-+++-~--t~-t--t--t-i-+-t+t~~-t-~1--+-1-+-++++-~~1---+--+-+-++-+++-~-I

~ '::-l:: t: : t: t: t:t:t: : : +: ;:r-;-r t~ttt~~-t~r-1-titttt~-J~t-ttiitH~~t-t-t-ltHtt-~t--t-ttttttl~1

0.04

0 .1 0.2 0.4 0 .60B I

100

I k

IOk 20k

FREQUENCY I Hz)

4 . The frequency response of both gain and phase are

drawing of response curves can be avo ided if an X-Y

plotted from the results of the computer run . Hand

plotting term inal is used for data output.

ELECTRON IC DESIGN 25, D ecember 6, 1970

If you make a product
no mailer what, we can

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Dow Corning silicone rubber RTV adhesive/sealants bond, seal and insulate. Cured materials give excellent resistance to breakdown by harsh environments. An adhesive/ sealant is shown here sealing feedthrough wires where they enter a high-vacuum test chamber. Units remain leak free under severe vacuum, wide temperature changes and wire flexing. Choose from several adhesive/sealants ... some offer choice of color; some are noncorrosive to copper.

Dow Corning®protective coatings cure at room temperature to form tough, noncorrosive coatings on components, subassemblies and circuit boards. Coatings have excellent resistance to moisture, dust, dirt, abrasive materials, ozone, radiation and many solvents and industrial chemicals. There are several to choose from . .. some are transparent, others opaque.

that's got to perform,
protect it.

Effective heat transfer and protection from corrosion are properties of Dow Corning heat sink compound. Diodes, transistors and rectifiers last longer and are more stable in operation when nondrying silicone paste provides full contact with heat sink for optimum thermal conductivity. Other compounds prevent corrosion of connectors, lamp bases ... lubricate gaskets.

Outstanding environmental protection for electronic components and assemblies-that's what Dow Corning RTV encapsulants provide. These materials cure to tough, yet flexible, silicone rubber that protects components from moisture, dirt, corona, weathering and corrosive atmospheres. Applications are almost endless, ranging from encapsulating printed circuit boards to encapsulating the glassenclosed image-intensifier tubes of U.S. Army helicopters' night vision units. There's a variety to choose from ... Some are transparent for easy visual inspection; others can be color coded ... and they' re adaptable to a wide variety of processing requirements.

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Electrical I electronic
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Fi!l!fiiilii4HM

Use this tan-lock demodulator
to get wide-range linear performance with no threshold or sideband problems.

Trade-offs between linearity and signal-tonoise ratio (S/ N) often determine the choice of phase demodulator used in a communication signal-processing system. The choice is usually made between two types, coherent and linear, but the field isn't that limited. There's another demodulator that can often be used-the tan-lock1 type.
To review the field, coherent modulators have ari output S/ N which is linearly related to all values of the input S/ N; conseq_uently, for all practical purposes, they have no threshold. But at large input deviation, sidebands are produced that are not easily filtered and are present in the output as interference. Tan-lock demodulators don't have this disadvantage.
Linear demodulators do not have this sideband problem, either, but they do exhibit a threshold. This results in degraded performance at low-input S/ N. Tan-lock demodulators have only a minor threshold effect, and they offer a possibility of extending the linear range.
Why use tan-lock demodulators?
The output voltage of the tan-lock demodulator has the form
E _ C sin 0
+ a - 1 C COS 0 '
which can be shown to have a greater approximately linear range than sin 0 for proper choice of "C." This output form gives the demodulator its name. The functions sin 0 and cos 0 are obtained from conventional phase detectors driven in quadrature. The greater linear range, of course, not only reduces distortion of the recovered modulationi but provides the demodulator with improvements in noise threshold, hold-in range, and pull-out frequency.
The tan-lock demodulator (Fig. 1), is used as a phase demodulator only. A separate loop is provided for carrier tracking. The signal from
Robert P. Hennick, Design Engineer, Communication Systems, Mail Zone C-62 , Bell Aerospace Co., Division of Textron, Buffalo, N. Y. 14240
74

IF SIGNAL
CARRIER INPUT

Acos8 MULTIPLIER .,___ _~
MULTIPLIER
1. The basic loop configuration of the tan-lock demodulator uses a multiplier in the feedback loop to perform
division. With the cos e input set to zero, the loop acts
as a coherent demodulator.
the carrier-tracking loop is a phase-modulated signal on a carrier, which is coherent with the i-f signal.
In the circuit shown, an analog multiplier with a transfer function of the form XY/ Ka where 10 .L:. Ka .L:. 100 is used. 2 The op amp in the circuit is connected as an inverting summer, whose gain to a signal at input 1 is - K1 and at input 2 is - K2.
The multiplier output E aA cos 0 / Ka
is fed to input 1 of the summer ana added to the (B sin 0) signal. The summer output is
-K1E a ~a cos 0 -K2 B sin 0.
This is the output signal E a that is fed back to the multiplier input. Therefore,
E a = - K i E a KAa cos 0 - K 2 B sin 0.
Solving for E 0 yields
E a = - - -- -KA 2B:s-in--0 --
1 + K1 K cos 0 a
ELECTRONIC DESIGN 25, December 6, 1970

For the case where - K2B = TK1A C,
C sin 0
E o = 1 + C cos 0
The value of E 0 is less than one for all values of C less than one. For linearity, the values for C should lie between 0.5 and 0.8.
The circuit shown in Fig. 2 uses an analog multiplier and an inverting summer. It is limited in frequency response to 100 kHz for full output current and to a maximum frequency of 25 kHz

IOJ.1.HC

V; 0 · Acosc/>

( 3 ' TAPPED DELAY

9.lk

0------'YV"V"'f'.,....,~---., LINE --~IN>r---.

+15V

LEVEL CONTROL
500

+15V

-15V

2. The characteristics of the tan-lock loop can be determined by breadboarding this circuit. Full output current is obtained at frequencies up to 100 kHz. The delax line adjusts phase quadrature,

for a phase shift of 1°. Sine and cosine inputs are provided with inde-
pendently adjustable amplitudes. Phase quadrature is adjustable by means of a variable delay line. With a cw sine and cosine input the demodulator will repetitively generate all output values as 0 varies from - 7T to + 7T. Tests indicate little output response deterioration at 100 kHz (less than 1 dB) .
The demodulator transfer function C sin 0 /
(1 + C cos 0) for C = 0.61 is shown in Fig. 3
superimposed on the sine-wave input. This function is linear for approximately ± 2 radians.
Get coherent demodulation, too
One further feature of this demodulator is that if the amplitude of the cos 0 input (Fig. 1) is reduced to zero, the multiplier output is zero, and the phase demodulator becomes a coherent demodulator with the characteristic transfer function B sin 0.
When this is done, the summer becomes an inverting amplifier. The demodulator can easily be changed to a coherent demodulator, then, providing a means for experimentally testing both linear and coherent demodulation. · ·
References
1. Gardner, F. M., Phaselock Techniqu es, John Wiley & Sons, Inc., New York, 1967.
2. Lindenlaub, J. C., et al, "Threshold Study of Phase Lock, Interim Technical Report NASA-CR-80844," Purdue University, December, 1966.

1.0

0 .8
C si n 8
B Eo · l+C COi
0.6

0 .4
;..;.;. 0.2
~
0 ~
.... 0
::>
.C..L.
::> 0 -0.2

-160"

-120·

-ao·

-40"

-0 .4

-0 .6

-o.a

,, ,, ,,,, ,,,,

-1.0

I
I
I
I

fCOHERE;T
,, ,, ,,,, ,, rTANLOCK

40"

eo·

120·

160° 1ao·

PHASE ANGLE (DEGREES)

3 . The output of the tan-lock loop is linear to phase angles of 2.0 radians when the control, C, is set to a
ELECTRON IC DESIGN 25, December 6, 1970

value of 0.6. For best results, the control should be set for values between 0.5 and 0.8.
75

Gould 4800 meets architects· demanding
requirements for hardcopy alphanumerics and graphics.

A Boston-based architectural firm, specializing in institutional projects, has made a high speed interactive computer system an integral part of their architectural design
process. And to take full advantage of this capability, they use a Gould 4800
electrostatic printer to provide hardcopy alphanumerics and graphics.
The Gould 4800 provides printout for feasibility studies, area diagrams, alternate plans,
perspectives, detail drawings, specifications and managerial reports. Where a plotter would
take up to 30 minutes to produce a drawing, the Gould 4800 delivers one in seconds. And where a dry-silver photographic
process would produce muddy copies that can't be traced or used directly, Gould 4800 copy is sharp, clean and fully
acceptable for client presentations. The computer system, called the
ARK/TWO was developed by Perry, Dean and Stewart Architects and Planners
and programmed by Design Systems, Inc.

It includes an Autrotrol digitizer, a DEC PDP 15/20 (16K), SOOK Disk, two Computek CRT's with a keyboard and tablet. Ultimately, it's felt th is advanced system wi II reduce the critical path in large construction projects by 4 to 6 months. All kinds of companies are using the Gould 4800 to meet all kinds of hardcopy requirements. This smooth, quiet unit delivers up to 4800 lines per minute on an 8Y2" or 11" format. It has an optional character generator. Software and interfaces for major computers are available. And while the Gould 4800 has relatively few moving parts and little need for maintenance, there are service facilities nationwide. Find out what the Gould 4800 can do for you. Give us a call. Or write: Graphics Division,
Gould Inc., 3631 Perkins Avenue, Cleveland, Ohio 44114.
·)GOULD

INFORMATION RETRIEVAL NUMBER 46

Solve interference problems painlessly.
Many noise sources, from contact arcs to ground loops, can be eliminated with these design hints and nomographs.

·Have you ever had a noise-interference problem and no realistic guide to its solution? You probably had to plow through a field-theory book or a number of articles to extract just that small bit of information needed to solve your problem. Or you may have thrown up your hands in disgust because of differences in presentation or disagreement among authors.
But you can reduce the drudgery of researching every problem you may come across. All interference problems are similar, and most can be solved quite simply. All it takes is a knowledge of the fundamentals.
Basically, two types of design action can be used to reduce interference: electrical and physical.
Good electrical design includes the incorporation of circuitry to suppress contact arcing and to reduce ringing.
Good physical design involves the appropriate use of cabling, grounding and shielding.
The main effect of good electrical design is to reduce the amount of interference at its source. Good physical design, on the other hand, is primarily concerned with protecting a circuit from noise that already exists.
Electrical design for low noise
Contact arcing is the most serious source of interference within electronic .equipment. Even a well-designed circuit located near a relay can be drastically affected by the small arcs generated at the relay contacts.
Th.e level of arcing across a pair of separating contacts is primarily determined by the ratio of inductance to resistance in series with the contacts. Additional factors that affect the amount of arcing are contact surface contamination and contact separation velocity.
Thin films of oil or grease can increas.e the field emission of the negative (cathode) contact. This is one of the reasons for having relays hermetically sealed.
Lou is F. Caso, Techni cal Consultant, 2400 E. Third St., Brooklyn, N. Y. 11223.
78

Increasing th.e contact separation velocity reduces the duration of the arc, but at the same time it increases the maximum arc voltage, because the voltage is proportional to L di/dt.
To suppress arcing across separating contacts, a capacitor can b.e placed across them. Unfortunately, this can aggravate the arcing that occurs when the contacts are closing-leading to the additional problem of contact welding. A resistor in series with the capacitor can ease these problems, but the larger the resistance the less effective is th.e capacitor in suppressing the separation arc. Thus, a trade-off must be made.
The optimum combinations of resistor and capacitor, as obtained by solving the equation

VC> R = 10 (3.16

1 I 50 / E '

are given in the nomographs of Fig. 1. For every value of circuit voltage, an infinite number of optimum combinations of R and C are possible. Thus, for example, if E = 200 Vdc, then a resistor of 100 n in series with a capacitor of 0.0076 µF would be appropriate, as would a resistor of 10 n in series with 0.3 ,µ,F.
Ringing is another common type of interference generated within electronic equipment. This is an undesired oscillation that occurs as a by-product of the normal operation of a circuit. For example, a square pulse may be applied to a relay coil to actuate the relay. At the same time, the pulse may excite the L-C circuit formed by the coil inductance and, say, a coupling capacitor. If the oscillation serves no useful purpose, it should be suppressed.
The most common method of reducing ringing is to introduce resistance in series with the ringing inductance. To easily calculate the amount of resistance needed to suppress the ringing of a given L-C circuit, the nomograph of Fig. 2 may be used. The nomograph solves the equation
R = 2 (L/ C) ' /2, which is the amount of resistance
needed to critically damp the circuit. A value of
resistance about 10 % greater than the critical-
damping resistance will provide enough overdamping to prevent ringing.
For example, with L = 10 µ,Hand C = 200 pF,

ELECTRONIC DESIGN 25, Decembler 6, 1970

C (µ.Fl
1

E(V) 100

C lµ.FI
1

0.1

I I I I
I 0.1

' ' ' ' ' ' ' ' ' 100
' '

E(V)

500 I

400
I
300
I
200

' I

.....
,oo ......

' 0.01

I I

I I I
I

0 .001

I I

I I I

ELECTRONIC DESIGN 25, December 6, 1970

0.05

0.1

+ E

THIS NOMOGIAPH SOLVES THE EQUATION
R : - - -E - - - - 10 (3.16Vc) l+ 50/E
1. Choose the optimum R-C combination to m1nim1ze contact arcing. This nomograph shows the best choices of R and C for different open -circuit voltages. The nomograph is broken into two sections: one covers 10 V to 100 V; the second covers 100 V to 500 V.
79

2. Ringing is suppressed by simply choosing R large enough to overdamp the circuit. Here, the critical damping resistance needed for various combinations of L and C, in a series circuit, is 'shown.

1.0 H

100 .. H

_n INPUT

·
JM.fl
c

c
lpf
10pf

10MH

EQUIVALENT CIRCUIT

1 MH

lOOfLH

lOOpf

1000 pf

0 . 01 fLF

lOfLH

0.1 fL F

1.0 fL F

ELECTRONIC DHIGN 25, December 6, 1970

CIRCUIT CARD A
I 234
1I l

FAIR
B I 2 34
l 11

c
I 23 4
1I1

CIRCUIT CARD A
i:1I 2 3 4 5

BEST
B I 2 345

c
I 2345
J

l
SYSTEM GROUND BUS
I. ac - POWER RETURNS
?· SIGNAL RETURNS lHFl
3. SIGNAL RETURNS l LF) 4. ALL de RETURNS

2 J

SYSTEM GROUND BUS

~EARTH - GROUND

I. ac - POWER RETURNS 2. de RELAY-POWER RETURNS 3. de -POWER RETURNSlNOT INCL . RELAYS) 4. SIGNAL RETURNS lLFl 5. SIGNAL RETURNS lHF)
8

3. Ground looping is minimized by keeping all groundreturn leads isolated from each other until they terminate at the system ground bus (b). Also, the bus is

earth-grounded with braided wire. This approach to grounding has been found to be better than the more common approach shown in "a."

the nomograph yields R = 448 n. For good sup-
pression, use R :::::: 500 n.
Physical design fights noise
The best-designed circuits may do all sorts of things except their intended functions if their grounding, interconnecting cabling and shielding are not also well designed. A short time spent planning these aspects of a system design can save many hours of frantic redesigning after the system is built.
A list of hints in these three areas follows.
GROUNDING
Shield all lines carrying signals above 50 kHz and ground the shields at both ends.
Use twisted shielded wire for all power lines and ground the shields at the transmitting ends only.
Make separate bus lines for de-relay (and other electromechanical-device returns) and for acsignal returns. Connect all bus lines to earth (chassis) ground with braided wire (Fig. 3).
Chassis-ground all control shafts by spring fingers to prevent interfering signals from reaching the device under control, such as a resolver.
Ground returns for rf and i-f signals at their respective chassis with wire less than one-half the length of the product of the signal's minimum risetime, r, and the line's propagation velocity,
v-d < rv/ 2. The propagation velocity of a line
is v = (LC)-1 !~ where L and C are the line's inductance and capacitance per unit length, respectively. The nomograph of Fig. 4 presents the max-
ELECTRO IC D ESIGN 25, December 6, 1970

imum line length, d, as a function of T and the inductance-to-capacitance ratio.
In the example shown on the nomograph the
line is assumed to have L = 0.1 µ,H / foot and C =
10 pF/ foot. Thus L/ C = l0'1H / F. For a risetime of 200 µ,s, the nomograph indicates that the grounding-wire length should be less than one foot.
Note: For sinusoidal signals, the wire length should not exceed a quarter wavelength.
CABLING
Prevent static charges from building up on the insulation of long cables because of vibration and longitudal movement, by interposing a thin film of cable lubricant between insulators. Care must be taken to choose the correct lubricant for rubber insulators. Teflon insulation agrees well chemically with almost any lubricant. Or you can tightly bond cable bundles about every 3 inches for each 3/ 4 inch of bundle diameter.
Keep power lines, relay and other electromechanical-command signals in separate cable bundles (away from low-level signal wires) as far as is practical.
Use twisted pairs for all signals in the audio range. The frequency of a nonsinusoidal signal can be calculated from the formula f = 0.35 T, where T is the rise or fall time of the signal, whichever is shorter, and f is the frequency of an equivalent sinusoid.
Always terminate a coaxial cable in its characteristic impedance to minimize reflections.
(continued on n ext page/
81

4. Don't let rf and i-f return line length exceed "d" as given by this nomograph , where L/C is the inductance-to-capacitance ratio (in henries per farad) of the line and 7 is the rise or fall time of the signal _(whichever is smaller).

10
L/C ( H/F I
82

10 ·· 100
'100 µ.1 10
10 µ..
1.0

100n1
10 ftl T

0.1 d (FEET)

ELECTRON IC D ESIGN 25, D ecemble r 6, 1970

200

z Q
I-
":z>
I"-'
I-
" 100 l---~-+-----+-l--l-4++++-~-+---11---!-+++f-tt~---ll---+-+-t-H-ttt-~+--+-++i+ttt-~---t~r---ir--t--tttti

0 IOOHz

I kHz

I Ok Hz FREQUENCY

IOOkHz

STEEL (SAE 1045)""1-....,I.-.!.,_ y A

J !..._~coPil!i., )

I- -

AL~'.:1~ Rh

zSTEEL (SAE\0415)
.._._...sI _-:Il3S:~I_.rg!._ )A

IMHz

I OMHz

ALUMINUM

5. Compare the shielding effectiveness (S) of aluminum, copper and steel by checking their electric-field reflection losses, R. ; magnetic-field reflection losses, Rh, and

asbsorption losses, A. S(dB) ::::= R" +R11 +A. The absorp-
tion losses are given for a one·mil thickness of material and can be scaled up for larger thicknesses.

SHIELDING
Shield your design with a material that can reflect and absorb external interference. A shield's effectiveness, S, is the sum (in dB) of all of the losses it imposes on a field that impinges upon it. S is approximately equal to the sum of the electric-field reflection losses, R,, the magneticfield reflection losses, R1,, and the losses resulting from a bsorption by the shield material, A.
The graph of Fig. 5 shows the reflection losses (both R. and R11 ) as a function of frequency for aluminum, copper and steel located one inch away from the source of interference. The graph can be used for larger distances by subtracting 1/ 2 dB per inch from R. and adding 1 dB per inch to R 11 .
Absorption losses for the same three materials are also shown in Fig. 5. The curves are all for a piece of material one mil (0.001 inch) thick. For thicker material, multiply the thickness, in mils, by the figures shown on the graph.
Assume for example, that a shield is required around a circuit to attenuate the interference r adiated by a wideband transformer located eight inches away. Let's also assume that 320 dB of attenuation is needed and that the lowest frequency component in the interfering signal is 3 MHz. Furthermore, let's require that aluminum be used because no oth er materials are available.
From Fig. 5, at 3 MHz, we find:
R,. = 156 - (1 / 2) x 8 = 152 dB
and
R11 = 45 + 8 = 53 dB.
ELECTRONIC D ES IGN 25, D ecember 6, 1970

Thus, R. + R11 = 205 dB. The remaining 115 dB
must come from absorption losses. Since a onemil thickness of aluminum provides 5 dB of absorption at 3 MHz, a thickness of 23 mils (0.023 inches) will be needed. · ·
Bibliography
ARCING Bates, C. C., "Contact Protection for Electromagnetic
Rel ays," Electromechanical Design, August, 1966. Germer, L. M., a nd Daworth, F. E., " Erosion of Elec-
trical Contacts on Make," Journal of Applied Physics, Vol. 20, November, 1959.
CABLING AND GROUNDING Brenner, M., and Manzi, M., "Grounding Coax and
Shielded Cable," Electronic News and En gineering, Vol. 62, No. 8, April, 1953.
Caso, L., "Approximating Cable Diameters," Design News, Jan. 5, 1970.
Hole, R. D., "Noise Generation by Coaxial Cables When Subjected to Vibrating," Electronic E ngineering, December, 1960.
Mahr, R. J ., "Interference Coupling-Attack It Early," EDN, July 1, 1969.
Manzi, M. ; Marsman, J. M.; and Brenner, M., "Grounding Shielded Cable," Electrical Manufacturing, Vol. 18, May, 1945.
MIL SPECS MIL-I-618D, Interference Control Requirements, Air-
craft Equipment. MIL-C-27072A, Cable, Special Purpose, Electrical Multi-
conductor. MIL-STD-285, Method of Attenuation, Measurement for
Enclosures, Electromagnetic Shielding for Electronic Test Purposes.
SHIELDING Ellwood, W. D., "Magnetic Shields," Bell Laborator ies
Record; November, 1938. Fichie, R. H., Electrical Interference, Hayden Publish-
ing Co., Inc., New York, 1964. Jorgensen, C. M., "Sh ielding in Modern Comp uter De-
sign," Automatic Control, Vol. 8, No. 6, December, 1958. Robinson, J . G., "F undamentals of EMI Shielding,"
Electro Technology, June, 1966.
83

What happened to tlie
model 19?

You're looking at some of the Teletype® basics used in building a data communications system. Printer, keyboard, tape sending and receiving combinations in a variety of speed capabilities. Teletype's modular design concept gives you the opportunity to extract the best terminal combination for system

needs today, and refine, add to, subtract and adapt as system modifications are called for. Just as important as the basics, are some of the things not obvious in the photos below. The logic devices, options and accessories that add almost limitless possibilities for making things happen exactly as

your system requires. We have some solid state logic devices that provide precise control of data traffic. That enable your computer to automatically poll data from a number of terminals and feed each terminal with processed data. There are error detection, correction and signal regeneration options to

model 33 series: An extremely economical 100 wpm terminal line. Has 4-row keyboard, uses 8-level ASCII code. The most widely used terminal in time-sharing systems today.

model 35 series: A rugged, heavy-duty line of 100 wpm terminals. Uses ASCII. Units in foreground are self-contained paper tape punch and paper tape reader.

TelespeedTM equipment: A line of high-speed tape-to-tape terminals capable of sending and receiving at speeds of 750, 1050 (shown above), or 1200 words per minute.

ELECTRONIC DESIGN' 25, December 6, 1970

DATA COMMUNICATIONS
equipment for on-line, real-time processing

keep data flowing faultlessly. Options such as pin-feed platens and form feed
controls that make it possible to fill
multiple copy business forms on-line. And many, many more. What did hap-
pen to the model 19? Believe it or not,
there are still some of these old, diehard terminals around. And that's

another advantage your data communications dollar buys when you specify Teletype equipment. It lasts. Moves data reliably, economically, for a Jong time. On a price/performance basis, Teletype equipment is in a class by itself.

Teletype data communications equipment is available in send-receive capa-
bilities of up to 2400 words per minute.
If you would like specific information about any of the equipment described here, write: Teletype Corporation, Dept. 89-17, 5555 Touhy Ave., Skokie, Ill. 60076.

model 37 series: One of the most versatile heavy-duty terminal lines going. Generates all 128 characters of ASCII. Operates at 150 wpm. Prints in upper and lower case.

lnl<tronic® data terminals: A unique electronic, solid state terminal. Prints up to 1200 wpm. Forms characters through electrostatic deflection (no typebox). ASCII compatible.

magnetic tape data terminals: Use compact reusable tape cartridges. Operate on-line at up to 2400 wpm, and connect "locally" to lower speed Teletype terminals using ASCII code.

Teletype is a trademark registered in the U. S. Pat. Office
EL ECTRO NIC D ESIGN 25 , Dece mbe r 6, 1970

machines that make data move
INFORMATION RETRIEVAL NUMBER 47

TELETYPE
'111' ..._ ........ ®
85

MANAGEMENT

Puzzled by management responsibilities? PAOll

This refresher gives you the complete picture

oes

of your duties, and guides you in the

techniques that lessen inherent conflicts.

Engineers often find that the jump from the drawing board to the executive board is a longer one than they had anticipated. Many aspiring young men with technical ability have fallen short of the management mark because they'v.e found it difficult or impossible to discharge the numerous, diverse, and conflicting responsibilities required of them. First-line or middle managers, for example, are responsible to four basic groups, including higher management; parallel organizations; subordinates; and customers.
So let's identify the supervisory responsibilities, examine their ramifications, and explore the inherent conflicts arising from them.

Responsibilities to top management
Depending on the company, the technical manager'.s responsibilities to higher management are determined either by executive management personnel, or jointly. The technical manager is expected to provide top management with what it wants, when and how it wants it. He's also expected to suggest or recommend changes, identify problems, and implement policy and directives from above. Beyond that he should:
· Ensure that the objectives of the technical activities are consistent with company objectives.
· Promote the growth and performance of the company, as well as the technical activity.
· Coordinate and direct large multidisciplinary project groups.
Technical managers often establish objectives that are not entirely consistent with those established by top management. They tend to emphasize understanding rather than utility, technical excellence rather than operating ease, and creativity rather than routine. The corporate group tends to emphasize financial soundness,
H. Burt Hiester, Advisory Marketing Representative, Avionics Systems Marketing, IBM Electronics Systems Center, Owego, N. Y. 13827.
The author's comments are not intended to reflect the nianagement policies of any one company but are based on his experiences with a number of electronics firms.
86

growth in business volume, and utility. To ensure company compatibility, it is up to the line manager to remind top management to define the company objectives, communicate them to the technical managers, and periodically review them. If implementation of a company objective has an adverse effect on the subordinates of the technical manager, he should inform management of the situation, support the claim with facts, and suggest constructive solutions.
Since top management is principally concerned with over-all company performance and growth, it is reluctant to advocate the expansion of one activity at the expense of others unless it can be reasonably established that the company will benefit sufficiently. Technical managers, not unlike other managers, tend to become embroiled in their own activities to such an extent that they sometimes fail to keep abreast of their over-all
EL ECTRONIC D ESIGN 25 , December 6, 1970

impact on the rest of the company. They must be constantly vigilant that balance is maintained.
A third responsibility to top management is to coordinate and direct large multidisciplinary groups that include representatives of different disciplines such as engineering, management, physics, chemistry, anthropology, and mathematics. Proper development and use of such a group can be accomplished, in part, by acquiring an understanding of a broader spectrum of disciplines with emphasis on how they relate to one another.
EL !o.CTRO IC D ESIGN 25 , December 6, 1970

In addition, accountability is an inherent part

of company activity. Every individual is account-

able for his actions to someone else. Therefore,

the technical manager is responsible for keeping

his superiors informed through some reporting

structure.

The schedule and type of report is generally

determined by the supervisor, but the two princi-

pal types of written reports are those for control

and those for planning purposes. Control reports

include information that facilitate evaluation,

show causes of variances from planned results,

and provide the basis for performance measure-

ment. Planning reports are those that keep

executive levels of management advised of the

The dotted lines on this corporate organization chart point out the four primary sources of
management responsibility the technical manager has. He fulfills his duties to top management, peer
groups, subordinates, and the customer by, respectively, providing data; negotiating; delegating and satisfying.

latest technological developments and potential new-product areas for the business organization to consider.

When responsibility is negotiable
The responsibilities of technical managers to parall.el organizations are sometimes difficult to define, especially when the functions of the various groups are vaguely described. The d.egree of responsibility then tends to become negotiable. In many instances one party will assume that the other party has tak.en the responsibility and tasks go unperformed. Since direct lines of control do not exist between parallel groups, coordination is essential. To solicit the support of parallel organizations, techniques or persuasion and cajolery-along with a sincere wish to help -are generally necessary.
The technical manager, more often than not, is a m.ember of the engineering department, · which may be only one of several parallel organizations within the company. To secure the necessary support, the technical manager should discharge his responsibilities according to th.e following guidelines :
· .Provide background information and highlight how each department contributes to the final output.
· Provide sufficiently detailed information so that parallel organizations can perform th.eir tasks efficiently.
· Request advice and comments rather than dictate.
· Avoid overcontrol, but insist on receiving prog1'ess and status reports on a regular basis. · · Do not blindly assume technical competence, but periodically check on quality of output.
· Recognize the achievements of these organizations.
A spirit of cooperation is essential among parallel oi·ganizations. Too often, well-conceived programs have floundered because of bickering and squabbling among the personnel.
Responsibilities to subordinates
In a broad concept, the primary responsibility of the technical manag.er to his subordinates is

service. A well-known Biblical quotation exemplifies this concept of service: "Let him who would become great among you first become the servant of all."
Specifically, the supervisor's responsibilities to his subordinates include motivation, leadership, and the establishment of a prop.er work climate. Through the manager's leadership and guidance in a proper working atmosphere, his subordinates become as productive as their abilities and moral.e allow.
When the productivity of a subordinate becomes limited by his ability, the manager should attempt .to provide him with tasks more suited to his abilities or with opportunities to increase them, such as .encouraging him to take courses within the company and outside it.
When th.e technical manager sees fit to delegate responsibility to his subordinates, he should attempt to abide by th.e following three cardinal rules:
1. Keep an open mind. 2. When a subordinate makes an honest mistake, try to turn it to advantage. 3. Don't overdirect subordinates. In addition to passing background and detailed assignment information down the line, the technical manager is responsible for forwarding pertinent information from his subordinates to

ELECTRON IC DESIGN 25 , December 6, 1970

higher management. In the interests of maintaining high morale among his subordinates and providing top management with realistic information prop.erly attributed to personnel, the technical manager should act more as an information relay center than as a converter or filter.
Technical managers have the additional responsibility of telling their subordinates the .complete .and honest story that applies to the over-all activities of the company and the technical group, as well as the areas covered by their performance appraisal. Most technical personnel want to know where they stand, how they're doing, and how they might improve. Here are some don'ts to aid technical managers to delegate responsibility:
· Don't use language that is vague in meaning.
· Don't assume that the person to whom you delegate work automatically knows what you want done.
· Don't talk down to employees or watch over their shoulders after you have delegated work.
Some do's include: · Select the proper employee for the task. · Use examples and · demonstrations when applicable. · Limit the number of orders given at one time.
ELECTRONIC D ESIGN 25, December 6, 1970

· Allow reasonable time for the job. · Follow up in an orderly fashion.
Responsibilities to the customer
The three principal responsibilities to the customer are :
1. Be on schedule. 2. Me.et technical specifications (performance). 3. Be within budget. Being on schedule has assumed greater importance in recent times with th.e advent of the large complex space and weapon programs. The overall progress of these programs depends upon the accomplishment of a multitude of subprojects. For . example, consider the space program in which the following major subprojects-just to .list a few-had to be completed before astronauts could be launched into space (with a high degree of assurance that they would return safely): · Develop and test launch vehicle. · Develop and test propellents. · Develop and .test space vehicle. · Develop and test electronic equipment. · Select and train personnel. · Develop and test ground tracking station network. · Perfect rescue or retrieval operations.
89

· Perform system marriage tests-equipment with equipment and personnel with equipment.
A delay in one or more of these projects resulted in the over-all program being delayed. In sucb situations the resulting expenses are greatly magnified when such a delay occurs, because the remaining subprojects still have to be financed during the delay period.
Meeting the technical specifications is an obvious responsibility of the technical manager since the final product, if it is hardware, must perform a task or do a job. There are also certain minimum performance standards (both electrical and environmental), dictated by the intended use or operation that must be achieved by the final product. In many cases the customer will request performance that is beyond the state of the art or performance that is really not required for the particular operation-such as overdesign. For these reasons the technical specifications are often relaxed during the course of the program.
Being within budget is probably the least important of the three responsibilities to the customer, nevertheless it is significant. In this era of technological advancement, especially related to research and development projects, it is almost impossible to predict budgets accurately. There is just too much virgin ground being plowed to program costs accurately, and the uncertainties simply overwhelm the certainties. For this reason, it might be more realistic to consider these budgets as tentative goals. However, the technical manager should strive to meet them.
Other responsibilities of the technical manager to the customer include: keeping the customer appraised of program status and progress as well as potential problem areas-there should be no surprises; maintaining cordial relations with the customer and making him an integral part of the project; and listening attentively to the suggestions of the customer in areas of concern to him.
The foremost responsibility of the technical manager is to keep the customer satisfied. And if the technical manager discharges all the previously mentioned responsibilities in an expeditious manner, he will have a satisfied customer.
Alleviating the conflicts
Now that several of the technical manager's responsibilities have been discussed and the sources from which they emanate identified, let's explore potential conflicts that arise from the diverse nature of these responsibilities and recommend a few techniques that should lessen their severity.
The general potential conflict arises from a variance in the perspectives of the technical and management groups. The technical group empha.-
90

sizes creativity and contributions to man's knowledge, whereas the management group emphasizes financial soundness, growth in business volume, and return on investment.
More specifically, conflicts arise in the area of selection and scheduling of tasks. The technical manager finds himself in the middle of this clash.
As a partial solution to this problem, each summer about 50 key personnel from one company (representatives of both management and technology) gather at an old farm in Vermont. There they reflect, consider, and discuss these conflicts and other areas related to maintaining a high level of company efficiency and growth. Bringing the representatives of both groups together in a relaxed low-pressure atmosphere allows them to contribute much to the solution of their own and mutual problems.
A second potential conflict lies in the area of training personnel vs meeting current schedules and budgets. Some technical managers take the long-range view that it is necessary to provide their personnel with a variety of experiences, especially early in their careers, so that they will become more versatile and make more significant contributions in the future. To accomplish this, the technical manager must often use his personnel inefficiently. This, in turn, endangers the likelihood of meeting current schedules and staying within budgets.
In this situation the technical manager sometimes finds it difficult to satisfy simultaneously his responsibilities to management and the customer, on the one hand, and to his subordinates on the other. Long-term gains might not be sacrificed so regularly to short-term profits if the technical manager could find a way to prove to management that the company would profit more over the long haul, from long-term gains.
In the application of controls the technical manager is confronted with a difficult problem. Top management and the customer have a basic· right to know the status and progress of the programs and to be advised of potential problem areas. To do this, technical managers must implement control procedures-which technical personnel appear to dislike intensely-because they claim that controls tend to: stifle creativity, create too much pressure, force-fit personnel to a schedule and measure the output only in terms of dollars.
If the technical managers were at liberty to select their own control procedures, they could possibly select procedures that would provide the necessary information and also be least objectionable to the technical personnel.
Though he may not solve all of his problems and create a utopian environment, by following these suggestions, the technical manager can do much toward lessening his dilemma. ··
ELECTRONIC DESJGN 25, December 6, 1970

General Electric's new epoxy T0-18 transistors run hot and cold

... / PASSED
Y SSC @ 85% R.H.
PASSED -65 to + 150C temperature cycling MIL TEST
General Electric has just introduced 32 new T0-18 based epoxy transistors. And we know they' re good. We've tested them over and over again. Tests like temperature cycling from -65C to + 150C. Not just a few times .. . but 300 times. That's 30-times the normal MIL requirement for reliability.
We 've subjected these new epoxy transistors to other tests, too, such as 85C at 85% relative humidity for up to 8000 hours just to find out how reliable they really are.
GE 's epoxy T0-18 transistors can take the bumps, too . No need to worry about shock or vibration damage. Their solid epoxy encapsulant provides rigid mechanical stability . . . seals trouble out and performance in.

We've got 16 new JEDEC types and many new GET replacement devices that will substitute for common 2N types with no redesign at all . We're adding more new types every month. They're available in NPN's, PNP's, matched pairs and Darlington amps with breakdown ratings up to 60V and dissipation as high as 500 mw.
We 've tested these transistors in every way possible. See the results for yourself in our new reliability

brochure (Pub. #95.28). We'll send the brochure along with specification sheets for GE's new epoxy T018 transistors.
Just write General Electric Company, Section 221-33, 1 River Road, Schenectady, N. Y. 12305. In Canada: Canadian General Electric, 189 Dufferin Street, Toronto, Ont. Export: International Sales Division, General Electric Co., 159 Madison . Avenue, New York, N. Y. 10016.

NPN

PNP

400f 500 2N6000 SO

3.0 2N6001

3.0

400t 500 2N6002 130

2.0 2N6003

210

l.5

400tt 500 2N6004 50

3.0 2N6005

3.0

400tt SOO 2N6006 130

2".0 2N6007

210

l.5

500tt 800 2N6010 45

45 5.0 2N60ll

45 J.O

SOOtf 800 2N6012 90

160

3.0 2N6013

180

135

70 2.0

SOOttt 800 2N60I4 45

15 5.0 2N6015

35 3.0

SOOttt 800 2N6016 90

3.0 2N6017

180

12S

SS 2.0

1 BVcf0=2SV; tr BVc(o:40V; tft BVcro=60V

GEType RtpllCH GEType Rtpl1ces GE Type RepllCH GET706 2N706 CET2221A 2N2221A GET3013 2N3013 GET708 2N708 GET2222 2N2222 GET3014 2N3014 GET914 2N914 GET2222A 2N2222A GET3638 2N3638 GET929 2N929 GET2369 2N2369 GET3638A 2N3638A GET930 2N930 GET2484 2N2484 GET3646 2N3646 CET2221 2N2221

GENERAL. ELECTRIC

INFORMATION RETRIEVAL NUMBER 48

ELECTRONIC D ESIGN 25, D ecember 6, 1970

ideas for design

Resistors improve immunity of flip-flops to noise
The noise immunity of a simple counting flipflop can be greatly improved by the addition of two resistors. The diagram shows a conventional circuit with the two extra resistors, R, and R,.
Without these resistors the circuit has almost zero noise immunity and can easily be triggered by noise pulses in the ground lines.
With the two resistors added, the noise im-
munity is R 2 Vee R,+R2
R. V errill, Industrial Systems Engineering Dept., G.E.C. Electrical Products Limited, Boughton Rd., Warwickshire, England.
VOTE FOR 311

RI
R2 4 .7k

470

C2 R6

15pF

4 .7k

4.7k

IOpFl..__ _ _ _l_. IOpF

bvbb

The flip-flop noise immunity is greatly improved by the addition of resistors R, and R_. With the two
addition al resistors the immunity is R2 V,.,. / R1 + R2 .

Eliminate warm-up resistors in lamp-driver circuits

Conventional lamp-switching circuits waste power by using lamp warm-up resistors. The conventional warm-up resistor continually conducts current through the lamp to maintain the filament resistance while limiting the current enough to avoid lamp illumination. This prevents excessive turn-on current surges when the warm-up resistor is bypassed to produce full lamp illumination.
Cold lamp turn-on surge currents can range to 10 times steady-state lamp currents, and they play havoc with the power supply and surrounding circuits, but standby lamp warming power can be a large fraction of active power dissipation. Furthermore, this warming current reduces the life of the lamp.
The circuit shown does not require standby power dissipation, and it requires less surge current capability than conventional lamp-driver circuits. This circuit cannot be damaged by insertion of a cold lamp while the driver is turned on. The circuit uses the delay inherent in the lamp warm-up.
When the input logic level is ZERO, Q, is biased off, thus biasing off Q2· When the input logic level changes to ONE, resistor R2 supplies constant current to Q2 biasing Q2 on and passes constant current through the lamp. Since the lamp has a very low resistance value initially, the

6 .3V 40mA LAMP
R2
RI
Standby lamp warm·up power is not required for this lamp-driver circuit. The delay inherent in the lamp itself is used to minimize current surges.
collector voltage of Q2 is approximately 5 V and Q, remains biased off. As the current from R2 and Q2 warm the lamp and its internal resistance increases, the collector of Q2 declines to less than the input logic level. Transistor Q, is biased to saturation as the internal resistance of the lamp increases to its steady-state value. If the input logic level returns to ZERO the circuit is, of course, biased off and the lamp is extinguished.
Alphonso H. Marsh, Jr ., Sr. Engineer, Raytheon Company, 111 Hors e Pond Rd., Sudbury, Mass. 01776.
VOTE FOR 312

ELECTRONIC D ESIGN 25 , December 6, 1970

If a thousand solid-state louu-level suuitches uuon't turn you on,
houu about $80 a suuitch?

You may not have 1024 signals at

switch is only $50. The other goodies

2.5 millivolts that you want to run at

make up the difference.

20kHz, but you can control that many if you want to by hooking eight of

You'll also be relieved to know that our low-level multiplexer works. Over

our solid-state differential multiplexer units together.
What's probably more important to you is that, even if you need only 128

...........
. . .... e · · · ·

40 systems are operating in the field with high reliability. User testimon ials furnished on request.
If you're interested in low cost, flex-

switch channels, it'll still cost you less

ibility and reliability in proven units

than $110 per channel, including a

that are available now, you ought to

12-bit A-to-D converter, power supply,

call us at (213) 679-4511, ext. 1139 or

all multiplexer control circuitry, 13

3392.

levels of programmed gain and interconnecting cabling - all ready to interface with your computer.

5 If you're not in a hurry, write Xerox
Data Systems, Dept. A, X"O~ 701 South Aviation Blvd ., ~U~

Actually, the incremental price per

El Segundo, Calif. 90245 ~~~~

INFORMATION RETRIEVAL NUMBER 49

ELECTRON IC D ESIGN 25, D ecember 6, 197 0

Variable clock source operates to 4 MHz
This variable-rate clock source is operable to 4 MHz and at the same time is both inexp.ensive and DTL/ TTL compatible. It will operate from supply voltages of 2 to 5 V, and its pulse output is directly compatible with the noise margins and rise or fall-time requirements of most DTL/ TTL IC logic. With the values shown in Fig. 1, a range of 200 KHz to 4 MHz may be realized by varying the 20-Kfl variable portion of RT. Other ranges may be obtained by changing the values of RT and CT. The frequency of oscillation may be approximated by the formula F = 1/ 1.7 RT CT.
The basic circuit is composed of an RC charging circuit (RT and CT) and a · regeneratively coupled pair of complementary transistors, Qi and Qz. The threshold voltage for the regenerative transistors is set at approximately 3 V (plus V EB of Q2) by the voltage divider formed by R 1 and R 2.
When power is applied to the circuit, CTcharges through RT until Qz becomes forward-biased. As soon as Q2 conducts, the regenerative coupling of Q1 and Qz enables extremely rapid turn-on of both transistors. Once Q1 and Q2 turn on, CT will discharge through Q2 and Q3. Q1 will go into saturation, limited only by diode D,, which turns off Q1 and Qz as soon as Q1 saturates. The cycle then begins again with CT charging until

+5V
390 RI l.5k

Cr· 300pF

OUTPUT

R2
2 .2k

.,..

· POLYSTYRENE CAPACITOR

Clocking for DTL/TTL logic over a frequency range from 200 kHz to 4 MHz is provided by this vari· able RC relaxation oscillator operating from 5 V. Output and ramp charging voltages are as shown.

threshold voltage is reached. Transistors Qa and Q. function to decrease the
CT discharge time and to limit positive excursions of Q1 base drive.
Craig A. Kuechenm eister, Research Instn1mentation E ngineer, Department of Psychiatry, University of Alabam a Medical School, Birmingham, Ala. 35233.
VOTE FOR 313

Zener adds offset capability to active filter
Many low-pass filter applications require an adjustment of the output de level that is independent of the output gain setting. This design task is greatly simplified by taking advantage of the inherent low output impedance of the active amplifiers used in the filter design.
The offset adjustment potentiometer is connected across a zener diode at the output of the first active filter section. The zener current and, therefore, its dynamic impedance are controlled by the resistor connected to the supply voltage.
In the circuit shown, a negative voltage is used, but the opposite offset range could be provided by using a positive supply voltage. The circuit constants shown are for a fourth-order Butterworh filter having a 3-dB cutoff at 300 Hz. The offset range was selected for 6 V and introduced
less than 1 % gain change over this range.
94

-15V·o----------------'
An offset range of 6 V with less than 1% gain
change is achieved by adding a zener diode and potentiometer to the outpl.Jt section of the first stage of this fourth-order Butterworth filter.
James W elch, Electronics Design Manager, Odetics, Inc., 1845 S . Manchest er A ve., A naheim , Cali f. 92802.
VOTE FOR 314
EL ECTRONI C D ESIGN 25 , December 6, 1970

how to
keep your

Heat generated in an enclosed rack or cabinet tragically shortens the Iife of the contents and seriously impairs the operation. That's why it's so important to install a blower .. . a Bud Trans-aire Blower.
Available in si x models. they all fit in standard 19" panel space and have the lowest silhouette height with the greatest CFM output in the industry. They are al I guaranteed for 20.000 hours of continuous duty.
See the Trans-aire Blowers at your
Jrans111a.1re- Bud Distributors and find out all about
their advantag es. Write us for catalog .
~---~~~~-------
IBO,@X1lrn ~
for your cabinets and racks

BUD RADIO INC.
Willoughby, Ohio 44094

INFORMATION RETRIEVAL NUMBER 50

E L ECTRONI C D ESIGN 25, D ecem ber 6, 1970

High-speed switch reverses current in an inductor

T,he switch circuit shown in the figure is capable of quickly reversing the current through ari inductor and maintaining that current for any desired time. It isolates the power supply while the energy in the inductor is transferred to a capacitor, and switches it back to the inductor with reverse polarity to get current flowing in the opposite direction. Voltage surges are neatly avoided. Polarized relays and electric motors often require this kind of switching.
Transistors Q,i and Q , are driven fully on or fully off by complementary, and not necessarily symmetric, rectangular waves, + E , and - E ,. When Q" is on and Q, is cut off, current flows through Q,-L-R"-R ,-D"-Qa. The voltage developed across D" cuts off (L Thus the source voltage appears across terminals A and B. This is a stable condition.
When the signal of Q3 and Q , reverses, the current in L has only one open path and that is to charge the capacitor. Thus the parallel LC tank circuit is isolated from the power source and wil l start to oscillate. Just prior to the end of a ha lf period when the voltage across C is equal to t he supply voltage, a stable condition exists again-but now the current in L flows in the reverse direction.
Diodes D:i, D ,, D, and D" prevent transistors Q, and Q" from becoming forward-bi ased and thus shorting the tank circuit during switching.
The switching capability of the circuit is given by
U/ to = VI/ 277.:

500

Ecc·3.2V

500

A
0 .1 F
01-06 : 1N3866 Ql-Q4 : 2N3643

Inductive voltage surges are avoided by this circuit that reverses current flow in relays on small tnotors. The R-L-C tank circuit is solated from E"c while the transistors are switched by the control voltages .
wh ere th e quantities in the e(fuati u11 an: U = total energy to be switched t" = switching time
VI = peak voltage and current ratings of
switching elements. The circuit will also function with a resistive
load. Z . D. Far kas , Stan ford University, Stan fo rd
Linear Accelerator Cent er, P.O. Box 4349, Stanford, Calif. 94305.
VOTE FOR 315

Use a unijunction transistor as an integrator reset

A common technique for resetting an integrator is to discharge an integrating capacitor with a relay or FET. To use these devices, a level sensing and driving circuit must be provided for an automatic integrator reset. A simple circuit that can provide an accurate temperature-stabilized reset point uses a UJT as shown.
The reset voltage is set by R , and R3 and is obtained from the empirically derived equation:

R, R0
R, + Ri

(0 .015R nn'Y})

(

RVi0+0 RR"3 -

V
OM

)

(1)

where R nn is the interbase resistance of UJT, 'YJ is the intrinsic standoff ratio of UJT, V<Cc is t he supply voltage and VoM is the maximum inte-

grator output voltage before reset. R, and R, are

determined by simultaneous solution of the node

equation for Vue at the reset point,

R , [R,(V B e- Vo~1) + R,rnVB"J

- R3R1rn (V0c - V H2 ) = 0.

(?)

RI 3.4k

R3 2k

R2 · 0 IF Cl < I p.F
R2 · l!l./µ.F IF Cl 5 I µ.F
Typical integrator reset times of 5 µ.s are obtained with this temperature-compensated ci rcuit. The reset point is stable to better than 0.02% / °C.

INFORMATION RETRI EVAL NUMBER 51 ...

If you have problems to solve, these days you need all the help you can get. That's where we come in. We make tools that extend your capabilities. And once you have our tools we give you all the support you need to use them efficiently.
We make three different calculating systems and a time-sharing mini-computer. The one thing they all share is versatility. For instance any calculator we make is capable of doing very sophisticated scientific work but it will also work for a business man, to accommodate the merger of science and business. A lot of things come up during the technical man's day that have to do with dollars and cents.
Every system we make has the added versatility that it can be programmed and will keep records in numeric or graphic

form. The important thing is you can have as little or as much as you want. When you want it.
We had to think of everything. Because you never know what you'll be thinking of.
For information on any Wang system, call Mr. Courtney collect (617) 851-7211. Wang Laboratories, Inc., Dept. ED- 12, 836 North Street, Tewksbury, Massachusetts 01876.
Thinking
tools.

The value of Vn" is determined from the equation

+ + 'Y)V B2 - 'Y)Vm 1 V oM

0.4 = 0.

(3)

With the calculated resistor values used as

initial values, a temperature coefficient of less

than 0.02 7o/° C can be achieved by trimming

R 1 and RJ. The trimming is required because of
variations in individual UJTs.

The time required for reset is typically less

than 5 µ,s, depending on the value of the inte-

grating capacitor and the UJT used. For long-

term integrators, the UJT parameters that would

be of prime consideration are Ir and h o. These

are, respectively, the minimum current to fire

the UJT and the emitter leakage current that

appears in parallel with the integrating

capacitor.

A typical choice of UJT may be a 2N4893
= whose maximum values are I r 1 µ,A and

I Eo = 0.01 µ,A at 30 °C. The circuit shown works only for negative output limits, but the same technique can be used for a positive limit by using a complementary UJT, or both types of UJT can be used to provide both positive and negative limits.
The values of R , and R3 are for an integrator
whose output limit is - 12 V with a Vcc of + 15
V. The UJT is a 2N4893 with a typical R Bn of 6 kn and 'Y/ of 0.8. R " has a value of zero if C1i the integrator feedback capacitor, is less than 1 µ,F , and R" has a valu.e of Hl/µ,F if C1 is greater than or equal to 1 µ,F.
Larry G. Srneins, Development E ngineer, Ball Bro thers R esearch Cor p. , Box 1062, Mail Station TT-2, Boulder, Colo. 80302.
VOTE FOR 316

Wideband sawtooth generator controlled by tunnel diode

Six transistors and a tunnel diode connected as shown in the diagram make an excellent and inexpensive wideband sawtooth generator.
Capacitor C is charged by a constant-current generator, Q.. A current of 10-mA maximum which is large compared with leakage currents, is controlled by the base voltage of Q... A precise
integration (0.1 %) is obtained in this manner
over a wide current range.
The accurate switching level of 0.1 % for a
10 °C temperature change and the rapid voltage drop (within 1 ns) of tunnel diode D are used to discharge the integrating capacitor at a speci-

tied output voltage. The discharge current passes through Q3. The
switching time can be set by adjusting the current through R and Qt.
The discharge pulse drives Q2 into conduction. The output voltage, 6 V pk-pk, is delivered by Qs and Q6. The minimum output frequency depends on leakage currents. The maximum frequency depends on the cutoff frequency of Q,"
Dr . J. A. van B est, Fysisch Laboratorium, Rijlcsuniversiteit Utrecht, Bijlhouwerstraat 6, Utrecht, Th e N etherlan ds.
VOTE FOR 317

Q2
AF118

A£Y 11

IOk

4 .7k

2 .2 k

l .8k

20V

27V

Q5 MPFI03

Q4 MMl711

I Ok

vsup
ill1
I Ok

Q6 MMl712

Vour
N'N'

The accurate switching characteristics of a tunnel diode are used to control this wideband sawtooth
98

generator. This circuit will operate over a frequency range stretching from 0.001 Hz to 5 MHz.
ELECTRONIC D ESIGN 25 , December 6, 1970

Time to settled

. < Is· 300ns«

In only 300nsec. the new l\1odel 1025 FET op amp reaches 0.01%of final value. lVlodel 1019 takes just 200nsec. longer.

Both of these new FET op amps are ideal for Model 1025 is a FET input op amp designed

high speed analog applications such as A/D for inverting applications where very fast

conversion , peak detection, high speed settling time and economy are desired. In

integration, coaxial line driving and fast addition to its 300nsec. to 0.01 % settling time,

sample and hold circuits. the 1025 features a slew rate of 500VI µ.sec .

1- - 1 Model 1019 is a differential FET op amp
featuring, in addition to its 500nsec. to 0.01 % settling time, a 1OOOVI µ.sec . slew rate and a
high gain-bandwidth P'°duct of 100 MHz

and a high output current of 50mA at -+- 1OV.
If you don't want to settle for less than the best, contact your local TPN representative or
Teledyne Phi lbcick Nexus, Allied Drive at

Other characteristics include: a full power

Route 128, Dedham, Mass. 02026.

frequency of 10 MHz, a CMRR or 1OOdB , · · Tel. (617) 329-1600.

and a low bias current of - 50pA.

Prices F.0 .8. Factory U.S.A.

Send today for complete specs and new Product Guide.

_.,~TELEDYNE
PHILBRICK NEXUS

INFORMATION RETRIEVAL NUMBER 52

EL ECTRONIC D ESIGN 25, December 6, 1970

Insure proper starting polarity of astable multivibrators

A simple RC circuit at a gate input can be used to insure an initial logic ONE output for the DTL astable multivibrator. This arrangement insures a high output at gate A when Vee is applied. If a logic ZERO is required, the complementary output gate B, is used.
When Vee is applied, the capacitor initially acts like a short circuit and takes current from the base of the output transistor, preventing it from saturating. The capacitor presents a logic ZERO to the input of gate A forcing a logic ONE at its output. The gate A output stays high long enough to force a logic ONE to the input of gate B. The output of gate B is then a logic ZERO, keeping· the first gate at logic ONE. Usual astable action then takes over, the frequency being determined by the timing capacitors.
The value of the starting capacitor is determined from the peak charging current and the dv/ dt value when the 5-V supply is switched on. The maximum charging current is limited by the monolithic resistance of approximately 3.75 kfl and the voltage drop of the input diode. The maximum charging current is approximately 1.2
= mA. Since i C (dv/ dt), C should be selected

for a minimum value equal to

1.2 ma dv/ dt

.,
An initial logic ONE output of the DTL astable multivibrator is insured with the simple RC circuit at the input to the gate. The charged capacitor does not interfere with normal 9stable operation.
The pull-up resistor R allows C to discharge when Vee is removed. Its value should be larger than 3.75 K to allow charging current to be supplied mainly through the gate. The charged capacitor at the input gate does not interfere with normal astable operation.
Wesley A. Vincent, Electronic E ngin eer, Motorola Inc., Governm ent Electronics Div ., 8201 E. McDowell Rd., Scottsdale, Ariz. 85252 .
VOTE FOR 318

IFD Winner for September 1, 1970 J. Diggelmann, Design Engineer, Institut fur Technische Physik an der ETH, Zurich, Switzerland. His idea "Frequency Discriminator Generates Logical Output" has been voted the Most Valuable of Issue award. Vote for the Best Idea in this Issue.

IFD Winner for September 13, 1970 William Ress, Engineer, Zeta Laboratories, Inc., 616 National Ave., Mountain View, Calif. 94040. His idea "Proportional Oven Control Is Low-Cost And Precise" has been voted the Most Valuable of Issue award. Vote for the Best Idea in this Issue.

IFD Winner for August 16, 1970 J. R. Nielsen, Electrical Engineer, Idaho Nuclear Corp., Idaho Falls, Idaho. His Idea "Transformerless Modulator Operates From De to 1 MHz" has been voted the Most Valuable of Issue award. Vote for the Best Idea in this Issue.
JOO

VOTE! Go through all Idea-for-Design entries, select the best, and circle the appropriate number on the Reader· Service-Card.
SEND US YOUR IDEAS FOR DESIGN. You may win a grand total of $1050 (cash)! Here's how. Submit your IFD describing a new or important circuit or design tec~nique, the clever use of a new component or test equipment, packaging tips, cost-saving ideas to our Ideas-for-Design editor. You will receive $20 for each accepted idea, $30 more if it is voted best-of-issue by our readers. The best-of-issue winners become eligible for the Idea Of the Year award of $1000.
ELECTRONIC D ESIGN 25, December 6, 1970

..............
CENTRALAB SEMICONDUCTOR
Division · GLOBE-UNION INC. 4501 NORTH ARDEN DRIVE EL MONTE, CALIFORNIA 91734

INFORMATION RETRIEVAL NUMBER 53

ELECTRON IC D ESIGN 25. D ecember 6. 1970

10 1

A little something to remember us by.

You're looking at an actual size photograph of the new N anostak@ NS-3020 com-
mercial memory stack. Proof that big things come in small packages. This stack is so compact its volume is only 25% of competing planar designs.
But we didn't cut corners on performance.
Nanostak is a modular

2Y2D stack with full cycle times as fast as 700 nanoseconds. Its maximum capacities are 32,768 words by 20 bits, 16,384 words by 40 bits and 8,192 words by 40 bits.
And everything happens so easily.
We've designed Nanostak with printed circuit board edge connectors and mounting jack screws. Which gives you a simple plug-in unit for all NS-3020 configurations.
Just where does Nanostak

fit in? On large fast main frame memories; time sharing systems; electronic telephone exchanges and radar signal processors. We've built enough reliability into this stack for process control applications in the most severe industrial environments. Vlide temperature range cores are even available as an option.
Nanostak. A little something you might want to talk over with us. Soon.
Em

Electronic Memories. Worth remembering.

Electronic Memories is a division of Electronic Memories & Magnetics Corporation 12621 Chadron Avenue, Hawthorne, California 90250 ·Telephone (213) 772·5201
INFORMATION RETRIEVAL NUMBER S4

· sclllators

The so~iq-state rn\cr fl e ~ OH\f't\:\r cQvere« in this Product Source TIW~Pl~ '¥ ~ fl q\y\~e~ \ntu three groups-tr~nsist ~ ~mH\ nq l\val~l\~l\~
sources.
Units are arranged ·~ ~ fl\\«'~g; Qr(:\~\' ~ upper-frequency Iin:iit ~" ' l~~\\ \l\O~\wttz~« ~ manufacturer. Max1ml\~ ~ p~ ~\\lp\.\t .{\QWef ~a approximately one watt.

,.
Abbrw.
AEL
Aerodyne
Airtran

Co~~

Arnerican ElectronifTa.Rs~ \\"\~·-..;;-

P.O . Box 522

Lansdale. Pa. 1944~ (215) 822-2929

Aerodyne Industries 666 Davisville Rd.
Willow Grove, Pa. 1~~~0 (215) 657-1800 I· 1

Airtran Div. of Litton lndustfi~s 200 E. Hanover Ave.
Morris Plains, N.J. 07~gq (201) 539-5500

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fiQ,
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Applied Tech

Applied Technology Div. of Itek Corp.
3410 Hillview Ave. Palo Alto, Calif. 94304 (415) 321-5135

Avantek

Avaotek, Inc. 2981 Copper Rd. Santa Clara, Calif. 95050 (4 ,8) 739-6170

Bradley/Edwin

G& E Bradley, Ltd.

Edwin Ind1.1stries \\961 Tech Rd.

Silver Spring, Md. 20904

(301) 622-0700

Calif. Micro

California Microwave, Inc. 455 W. Maude Ave. Sunnyvale, Calif. 94086 (408) 732-4000

Cayuga

Cayuga Associates, Inc.
Cornell Research Park Ithaca, N.Y. 14850 (607) 257-0555

Centi labs

Centilabs Codc. 2455 Pld Mi Qlefield Way Mo1.1ntain Vievv. Calif. 94040 (415) 969-0427
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~MF Systems, Inc. RO , Box 1009 ~t11te Collll!le, P&. 1aao1 (~14) 237-6022

~nmlirn&nn Microw11v11 Co.

S~yline Or.

Montville. N.J. 07Q46

(201) 334.5794

Information Retrieval No.
437
438

f~i1~nH~

Fai[chilQ Miarowava & Optoelectronics

2q1~ Ch&rleston Rel.
Mount<1in Vjew, Calit 04040

439

(415l 9BH391

f !~~- ~q~IF?S f req4ency Sources, Inc.

Kennedy Qr. North C!ielmsford. M~sa. 01863

440

(pl7) 2~1-4921

G1~~nr~v l+P

w. ~reenray lnqµstries, Inc,
840 cnurcn Rd. Mechariicsburg. Pa. 17066 ~7 \ 7) 766-0223
--
~ewlett· Packard
501 Paga Mill Rd. r.alo Alto, Calif. 94304 ~ 15) ~26-7000

441
Contact local sales office

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Hitachi L\cl.

Marnbepi-licla (Arneric<1)1 Inc.

200, Park Ava.

442

New YQrk, N.Y. 10017

(2121 f\73-6500

Ht.1Qties Aircraft

~lectron Dynamics Div,

j1QO W. Lomita Blvd.

443

Qrranca, Calif. 90509 12,~) li~H12\

iritamation11I Microwave Corp.

~~ ~iver M
f.ll~~C~q6~,\C'.6o2n7n7. 06807

444

V 1 r'

·.. '·

.. Fl-fCT~qNtC D' ESIGN ~S, December 6. 1970

Abbrev. I ntradyne

Company
Intradyne Systems, Inc. Sub. of Texscan Corp. 1261 Birchwood Dr. Sunnyvale, Calif. 94D86 (4D5) 734-35D4

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M-0/MOSC MA MPD

M-0 Valve Co., Ltd.
Metropolitan Overseas Supply Cdtp.
468 Park Ave. South New York, N.Y. 10Dl6 (212) 686-212D
Microwave Associates, Inc. South Ave. Burlington, Mass. Dl 8D3 (617) 272-3DDD
Microwave Power Devices, Inc. 556 Peninsula Blvd. Hempstead, N. Y. 1155D (516) 538-752D

tli =
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MPG Marconi Micro State Micro mega Micro phase Miteq Monsanto

Microwave Products Group, Inc. Sub. of Sage Laboratories, Inc. 3 Huron Dr. Natick, Mass. Dl 76D (617) 653-D844
Marconi Instruments Ltd. 111 Cedar Lane Englewood, N.J. D7631 (2D1) 567-D6D7
Micro State Operation Raytheon Co. 13D Second Ave. Waltham, Mass. D2154 (617) 899-8D8D
Micromega Div. of Bunker-Ramp 12575 Beatrice St. Los Angeles, Cal if. 9DD66 (213) 391-7137
Microphase West Div. of Microphase Inc. River Rd. Cos Cob, Conn. D68D7 (2D3) 661-62DD
Miteq, Inc. 1DD Ricefield Lane Hauppauge, N. Y. 11787 (516) 543-8873
Monsanto Microwave Products 11636 Administration Dr. St. Louis, Mo. 63141 (314) 694-4816

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Mu Ila rd

Mullard Inc. lOD Finn Court Farmingdale, N.Y. 11735 (516) 694-8989

Nippon OKI

Nippon Electric New York, Inc. Pan Am Building, Suite 3721 2DD Park Ave. New York, N.Y. 1DD17 (212) 661-342D
OKI Electronics of America, Inc. 5DD/5D6 S.E. 24th St. Fort Lauderdale, Fla. 33316 (3D5) 523-72D2

Omni Spectra

Omni Spectra, Inc. 253 S. Hinton Ave. Scottsdale, Ariz. 85251 (6D2) 947-84DD

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ELECTRONIC DESIGN 25 , December 6, 1970

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lriformation Retrieval
No. 460
:
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462
463
464
465
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105

INFORMATION RETRIEVAL NUMBER 55

106

ELtCTRON IC DESIGN 25, December 6, 1970

Microwave Oscillators, Solid-State (transistor)

Manufacturer
Omni Spectra Omni Spectra Omni Spectra Omni Spectra Zeta Omni Spectra MPD Omni Spectra Miteq Omni Spectra
MPO MPG MPG Freq. Sources MPG MPG MPG MPG Miteq Miteq
Miteq Omni Spectra MPG MPG Miteq Omni Spectra MPD Miteq Freq. Sources Omni Spectra
EMF EMF EMF EMF EMF Omni Spectra Omni Spectra Omni Spectra Engelmann Micro phase
Miteq Miteq Miteq Omni Spectra Spectra Texscan W-J MPD Miteq Omni Spectra
Applied Tech. Omni Spectra Miteq Spectra EMF EMF MPD Aerodyne Omni Spectra W-J
EMF EMF EMF Micro phase Miteq Miteq Miteq Omni Spectra Omni Spectra Omni Spectra Omni Spectra
PEL Spectra Spectra Texscan W-J W-J W-J W-J Yig-Tek

Model
28671 -51 28671-53 28651-10 28671-54 4208 28671-56 SSl00· 150· 1 28671·57 OTM-lA-1218 2865 J.16
SS 150·225- 1 E-30-250 M-30-250 FS·21A E-60-250 M-60·250 E-90-250 M-90·250 OTV-3A·0125 OTV·lA-0125
OTV-2A·0125 28671-58 E· 135-250 M-135·250 OTM· lA-1725 28651-18 SS225·335· 1 OTM· 1A-2335 FS-218 28651-21
TS-10 TS0-10 VTN-1 VTO·l VTW-1 2867105 2867110 2867120 FF-500 series VTS12550
OTV-1A-0250 OTV·2A-0250 OTV·3A-0250 28671-60 VT-0452 VTS-25 WJ-2811 SS 335·5 OTM-1 A-3450 28652-22
SFU series 28652·23 OTM· 1A-4670 VT-0532 TS-11 VTW·2 SS 500-750· 1 S1002·6 28652·24 WJ-571-10
TSO · l 1 VTN-2 VT0-2 VTS 2510 OTV-1 A-0500 OTV-2A·0500 OTV·3A-0500 28672-62 2867205 2867210 2867220
OP· 100 VT-0712 VT-0752 VTS-50 WJ.571 WJ-571 -1 WJ -2800 WJ-5077 300

Operating
Frequency
Range
(GHz)
0.010-0020 0.020·0.040 0.056 0.030·0.060 0.05-0 .12 0.060·0.120 0.1 -0.15 0.080·0.160 0.12-0.18 0.180
0.15·0.225 0.03-025 0.03·0.25 0.06-0.25 0.06·0.25 0.06-0.25 0.09-0.25 0.09·0 .25 0.125·0.25 0.125-0.25
0.125-0.25 0.125·0.250 0.135·0.25 0.135-0.25 0.17-0.25 0.270 0.225-0.335 0.23-0.35 0.25·0.45 0.470
0.010·0.5 0.01·0.5 0.01-0.5 0.01 ·0.5 0.01·0.5 0.010·0.500 0.010·0.500 0.010-0.500 0.100-0.500 0.250·0.500
0.25·0.50 0.25·0.50 0.25·0.50 0.250-0.500 0.25·0.50 0.25-0.5 0.25·0.5 0.335-0.5 0.34·0.50 0.560
0.3·0.6 0.680 0.46-0.70 0.375-0.750 0.5·0.75 0.5-0.75 0.5·0.75 0.6-0.8 0.820 0.75·0.87
0.5· 1.0 0.5·1.0 0.5·1.0 0.5 to 1.0 0.5-1.0 0.5-1.0 0.5·1 .0 0.500· 1.000 0.500· 1.000 0.500-1.000 0.500-1 .000
0.5·1.0 0.50·1 .0 0.50-1 .0 0.5·1 .0 0.5-1 .0 0.5·1 .0 0.5-1.0 0.5· 1.0 0.5·1.0

Tuning
Range
(MHz)
octave octave 40% octave p octave 50 octave 60 40%
75 30 30 p 60 60 90 90 125 125
125 octave 135 135 80 40% 110 120 p 40%
25% octave 10% octave 25% 10% 20% 40% ina 250
250 250 250 octave octave 250 250 165 160 40%
0.1% 40% 240 octave 250 250 250 ina 40% 120
500 10% 500 500 500 500 500 octave 10% 20% 40%
500 octave
octave
500 500 500 500 500 500

Output Power Min -Max (mW)

Notes

600 typ q 600 typ q 400 typ hn 600 typ ~ 10 min 11 600 typ q 1000 typ (6) 600 typ q 300 min nx 400 typ hn
1000 typ (6) 100 typ a 100 typ n 10·20 i 100 typ a 100 typ n 100 typ a 100 typ n 100 min q 150 min q

100 min q

600 typ q

100 typ a

100 typ n

300 min nx

400 typ hn

1000 typ (6)

300 min nx

5-10

400 typ hn

1·1000 h 1-1000 1·1000 h 1·1000 1-1000 h 400 typ hq 300 typ hq 300 typ hq 10-1000 ij 50 typ j

150 min q 100 min q 100 min q 500 typ q 500 min bq 600 min q 100 min q 1000 typ (6) 200 min nx 250 typ hn

200 max hij 250 typ hn 200 min nx 300 min bq 1-1000
1·700 1000 typ (6)
1000 typ i 250 typ hn
60 min d

1-1000 1-900 h 1-500 50 typ j 100 min q 80 min q 100 min q 250 typ q 200 typ hq 150 typ hq 150 typ hq

10 min d 100 min bq 500 min bq 400 min q 20 min d 100 min d
100 min q
20 min d 10 min d

Price
($)
req req req req req req req req 240 req
req 230 230 400 230 230 230 230 370 280
350 req 230 230 240 req req 240 425 req
140-170 150-250 140·225 220-375 150-250 req req req req 295-695
280 350 370 req req 195 req req 240 req
req req 270 req 150·190 170-330 req 625 req req
170-305 150-250 180-200 295-695 320 390 395 req req req req
req req req 195 req req req req 1000

Manufacturer
Zeta EMF EMF Miteq Miteq Miteq MPO Aerodyne Omni Spectra Airtran
Calif. Micro. Fairchild Nippon Freq. Sources EMF W-J Aerodyne Calif. Micro. Fairchild Calif. Micro.
Fairchild Nippon Freq. Sources Miteq Airtron
Sanders Zeta Zeta Zeta
Freq. Sources Spectra EMF EMF EMF Freq. Sources Omni Spectra Calif. Micro. Fairchild Zeta
Zeta Zeta Zeta Zeta Zeta W-J Zet a Zeta Freq. Sources Calif. Micro.
Fairchild Freq. Sources Freq. Sources Engelmann Omni Spectra Calif. Micro. Zeta Freq. Sources Applied Tech. Applied Tech.
EMF EMF Engelmann Fairchild Fairchild MA Microphase Miteq Miteq Miteq Miteq
Omni Spectra Omni Spectra Omni Spectra Omni Spectra Omni Spectra PEL Spectra Te xscan W-J

Model
4301 TS-12 VTW-3 OTM-lA-6710 OTC · l A OTC-18 SS 750· 1000·1 S1002-8 286523·25 6
PA11P MO(U· 102 LD-905 FS-2M TS0-12 WJ-571·6 S1002-10 PA12P MO(L) 104 PA13P
MO(L) 106 LD-903 FS-2R OTM·1A·9414 5
DG716 4312 4602-00 4602·01
FS-36 VT-1132 TS-13 VTN-3 VTW·4 FS-26 28653-27 PA15P MO(L) 108 4313
4601-00 4601-01 4315 4603-00 4603-01 WJ-571-11 4600-00 4600·01 FS-7 PA17P
MO(L) 110 FS-6 FS-5 MT-107 28653-28 PA19P 6508 FS-21C SF L series SML series
TS0-13 VT0-3 ET-109 MVL 2700 MVL 2710 MA -86746 VTS312 OTC -2A OTV· l A· 1000 OTV-2A· 1000 OTV-4A· 1000
28673-64 28773·64 2867305 2867310 2867320 OL-103 VT-1522 VTS-100 WJ 569

Operating
Frequency
Range
(GHz)
0.5·1.0 0.75· 1.0 0.75-1.0 0.67·1 .0 0.7·1.0 0.7· 1.0 0.75-1.0 0.8·1 .0 1.000 0.95· 1.05
0.98-1.10 0.980· 1.100 1.140-1.180 0.2· 1.2 0.6-1.2 0.6-1.2 1.0·1.2 1.08-1 .22 1.080· 1.220 1.20-1.32
1.200-1.340 1.225-1.380 0.6· 1.4 0.94-1.4 1.25-1 .35 1.2· 1.4 0.8-1.45 1.435-1.485 1.435-1.485 1.435· 1.485
0.2·1.5 0.75-1 .5 1.0·1.5 1.0·1 .5 1.0-1.5 1.2·1.5 1.500 1.30-1.52 1.320· 1.520 1.485· 1.535
1.485-1.535 1.485-1.535 1.535-1.540 1.535· 1.540 1.535-1.540 0.56-1 .56 1.65· 1.67 1.65·1.67 0.1-1.7 1.50·1.72
1.500-1.720 0.3-1.8 0.5-1.8 0.90-1.8 1.800 1.63-1.92 1.85-1.99 0.45-2.0 1.0·2.0 1.0·2.0
1.0·2.0 1.0·2. 0 1.0-2.0 1.0-2.0 1.0-2.0 1.0·2.0 1.0·2 .0 1.0-2.0 1.0·2.0 1.0-2. 0 1.0·2.0
1.000 -2. 000 1.0·2.0 1.000-2.000 1.000·2.000 1.000-2.000 1.0-2. 0 1.0-2.0 1.0-2.0 1.0·2.0

157

Tuning Range (MHz)

Output Power Min-Max (mW)

Notes

20 min cij

250

1·1000

250

1·700

330

100 min nx

14%

1400 min jm

14%

600 min jm

250

1000 typ (6)

ina

1000 typ i

20%

250 typ hn

100

800 min ab

120

250-400 bf

120

250 min j

10 min i

12%

1000 typ hqr

600

1·300

600

50 min d

ina

1000 typ i

140

250-400 bf

140

250 min j

120

250-400 bf

140

250 min j

40 min I

1000 typ ch

460

50 min nx

100 elec. 400 min

200 mech.

0.5

10 min gjn

1000 typ fj

500 min m

1000 typ m

octave octave 500 10% 500 300 20% 220 200 p

10-250 q 300 min bq 1-300 1-300 h 1-200 10-40 m 100 typ hn 200-300 bf 250 min j 1000 typ fj

40 40 p 5 5 1000 20 20 15% 220

500 min m 1000 typ m 1000 typ fj 600 min m 1000 typ m 20 min d 600 min m 1000 typ m 50·200 ch 150-225 bf

220 15% 15% 200 20% 290 140 p 0.1% 1%-15%

100 min 25-100 25 typ 500 typ 100 typ 50 min 10 typ 5-1000 10-1000 10-1000

j hq I Ch ajn hn bf ij
I
hij hmn

1000

1·100

1000

1·50

1000

250 min a

1000

50 min q

1000

75 min q

1000

10 typ

1000

50 typ j

14%

1000 min 1m

1000

150 min q

1000

50 min q

1000

100 min q

octave octave 10% 20% 40% 1000 oct ave 1000 1000

150 typ q 150 typ q 130 typ hq 100 typ hq 100 typ hq 10 min d 250 min bq 200 min q 20 min d

Price
($)
req 150-195 175-190 270 595 495
re~
680 req req
req req req 520 250-350 req 800 req req req
req req 450 270 req
800 req req req
360 req 225-240 170-250 180-250 200 req req req req
req req req req req req req req 325 req
req 310 310 500 req req req 550 req req
350·375 420-450 req req req req 295-695 675 450 450 695
req req req req req req req 275 req

ELECTRONIC DESIGN 25, December 6, 1970

107

Microwave Oscillators, Solid-State {transistor)

158

Manufacturer
W-J W-J W-J W-J W-J Yig-Tek Zeta EMF EMF EMF
Freq. Sources Fairchild Calif. Micro. Marconi W-J Omni Speclrn Nippon Calif. Micro. Freq. Sources AEL
Micro mega Fairchild Sanders W-J W-J Nippon Freq. Sources EMF Freq. Sources Trak
Fairchild Nippon Aerodyne EMF Omni Spectra Spectra EMF W-J EMF Trak
W-J Fairchild Trak Centi labs Freq. Sources Trak Fairchild Fairchild Freq. Sources Miteq
Sanders Applied Tech. Applied Tech. Avantek Avantek Engelmann Fairchild Fairchild Freq. Sources Freq. Sources
Freq. Sources H-P H-P Microphase Miteq Miteq Omni Spectra PEL Spectra Tex scan
W-J W-J W-J W-J Yig-Tek W-J Calif. Micro. Calif. Micro. Avantek Spectra

Model

Operating Frequency
Range (GHz)

WJ-569-1 WJ-569-3 WJ-2802 WJ-2803 WJ-5078 310 4302 TS-14 VTN -3.1 VTW-5
FS-50 MO(L)l 12 PA20P 6055 WJ-569-2 28654-29 LD-885 PA22P FS-28 MIC3068-l
28450- l 0 to 22 MO(S) 114 OG715 WJ-2810 WJ-572-13 L0 -884 FS-25 TS-15 FS-30A 6000-1307

1.0-2.0 1.0-2.0 1.0-2. 0 1.0-2. 0 1.0-2. 0 1.0-2. 0 1.0-2. 0 1.5-2.0 1. 5- 2.0 1.5-2.0
1.5-2.0 1.700-2. 020 1.78-2.04 0.85-2.15 1.0-2.2 2.200 2.090-2.210 2.00-2 .27 1.5-2.3 20-2.3
0980-2.320 2.000-2.320 1.0-2.4 1.4-2.4 2.0-2.4 2.340 -2 .460 1.8-2.5 2.0-2.5 20-2.5 2.2-2.7

IS) 116 LD-904 Sl 007 TS0-14 287734-65 VT-22 12 VTN-4 WJ-572-32 TS-16 6000-1300
WJ -572-19 IS)l 18 6000-1305 OLS2000 FS-14R 6000-1306 MS(S) 42 MSIS) 420 FS-47 OTC-2B
DG 717 SFS series SMS series AV-7200M AV -7202M ET -111 MVS 4700 MVS 4710 FS-4R FS-31
FS-300 35009A 35009B VTS 324 OTV-5A-2000 OTV-1 A-2000 28774-66 OS-100 VT-3051 VT0-200
WJ-572 WJ-2804-20 WJ -2804-40 WJ -5079 320 WJ -572-33 MT41P PA41P AV-7202M-08 VT-3141

2300-2 720 2.665-2.935 1.0-3.0 1.5-3.0 1.5-3.0 1.5-3.0 2.0-3.0 2.0-3.0 2.5-3.0 2.7-3.0
1.56-3.16 2.700-3.220 3.1-3.4 1.5-3.5 2.4-3.5 3.2-3.6 3.600-3.900 3.600-3.900 1.0-4.0 1.0-4.0
1..45-4.0 2.0-4.0 2.0-4.0 2.0-4.0 2.0-4.0 2.0-4.0 2.0-4.0 2.0-4.0 2.0-4.0 2.0-4.0
2.0-4.0 2.0-4.0 2.0-4.0 2.0-4.0 2.0-4.0 2.0-4.0 2.0-4.0 2.0-4.0 2.0-4.0 20-4.0
2.0-4.0 2.0-4.0 2.0-4.0 2.0-4.0 2.0-4.0 3.0-4.0 3.63-4.13 3.63-4.13 1.7-4.2 2.1-4.2

Tuning
Range (MHz)

Output Power Min-Max (mW)

Notes

1000 1000 1000 1000 1000 1000 p 500 10% 500

10 min 50 min 30 min 100 min 15 min lOmin 20 min
1-200 1-200 1-100

15% 320 260 1300 1200 20% 120 270 800 p

200 max 75 min 50 min 50 typ 20 min 50 typ 100 min 40 min 10-20 10 min

200-300 320 2 1000 400 120 200 500 p 500

250-1000 50 min 180 min 40 min 35 min 100 min 40 1-200 10-15 lOmin

420 p ina
1500 octave octave 10% 1000 500 300

20 min 40 min 1000 typ 1-50 150 typ 100 min 1-100 30 min 1-100 15 min

1500 520 300 50 1% 400 300 300 oc tave ±7%

10 min 20 min 15 min 50-100 500 typ 8 min 10 mi n 50 min 15-150 40 min

0.5 0.1% 1%-15% 2000 2000 2000 2000 2000 1% 800

5 min 10-1000 10-500 25 min 30 min 50 min 40 min 75 min 7-15 10-20

10%

50-200

2000-4000 10 min

2000

50 typ

2000

40 min

2000

40 min

octave 100 typ

2000

1 min

octave 50 min

2000

100 min

2000 2000
2000 2000 2000 1000
500 500 2500 octave

5 min 20 min 40 min
5 min 10 mi n 15 min 10 min 10 min 20 min 40 min

d d q q d d cij
h
bhq j bf
d hn y bf m
jn
i
n (2) q d y q
i
i
I
ij
q bq h d
d
i
ch
g g q jm
gjn hij hmn d d a q q ch m
bhq adpt adpst
i
q q q d bq q
d q q d d d beg bet d bq

Price
($)
req req req req req 1000 req 250-395 170-290 250-310
req req req 945 req req req req 350 225
160-560 req 750 req req req 450 290-330 750 req
req req 2600 410-475 req req 320-350 req 320-350 req
req req req 550 600 req req req 650 575
800 req req 1200-1400 800 -900 1200 req req 340 380
req 715 765 295-695 1150 900 req req req 600
req req req req 1200 req req req 900-1000 req

Manufacturer
Fairchild Fairchild Tex scan Fairchild Calif. Micro. Calif. Micro. Fairch ild Fairch ild Engelmann Engelmann
Freq . Sources Freq. Sources Microphase Omni Spectra Omni Spectra Omni Spectra Omni Spectra Microphase Omni Spectra Omni Spectra
Tex scan Fairchild Omni Spectra Zeta IMC Zet a Zeta Freq . Sources Freq . Sources Freq. Sources
Engelmann Freq . Sources MA Sanders Freq. Sources Zeta Fairchild Airtran MA Fairchild
Fairchild Calif. Micro. Calif. Micro. Fairchild Freq . Sources Texscan Micromega Fairchild Calif. Micro. Calif. Micro.
Fairchild Calif. Micro. Calif. Micro. Fairchild Freq . Sources Fairchild Calif. Micro. Calif. Micro. Applied Tech. Applied Tech .
Omni Spectra Omni Spectra Calif. Micro. Fairchild Zeta Calif. Micro. Micro mega Calif. Micro. Fairchild Engelmann
Nippon Airtran Airtran
Tra~
Cal if. Micro. Greenray Greenray Brad ley / Edwin Bradley/Edwin Trak

Model

Operating Frequency
Range (GHz)

MSIS) 440 IS) 44 VT0-300 MS(C) A 480
MT49P PA49P MS(C) 48 MS(C) B 480
CC-1000 series PL-1000 series

3.850-4 .200 3.850-4.200 3.0-4 3
4.330-4 630 4.33-4 .93 4.33-4.93 4.330-4.930 4.600-4.930 0.685-5.0 0.685-5.0

FS-23 FS-30 VTS 345 287703 287705 287710 287720 VTS 22652 287745-67 28795-1
VT0-400 MS(C) 52 28795-2 4408 TOC-6000G 4213
4303 FS-14 FS-14L FS-27H

2.5-5.0 2.5-5.0 4.0-5.0 1.000-5.200 1.000-5.200 1.000-5.200 1.000-5.200 2.6-5.2 2.6-5.2 4.8-5.4
4.0-5.5 5.400-5 900 5.4-5.9 5.4-5.9 1.0-6.0 1.0-6.0 2.0-6.0 2.3-6.0 3.5-6 .0 3.6 -6.0

MT-230 FS-9R 86748 DG718 FS-53 43 14-01 MS(C) A540
4 86Cl6 MS(C) B540

4.0-6.0 4.0-6 .0 4 0-6.0 4.0-6.0 4.5-6.0 5.0-6.0 5.855-6.l 05 5.7-6.2 6.0-6.3 6.105-6.355

MS(C) 540 MT64P PA64P MS(C) 54 FS-lR VT0-500 284501'385-665 MSICI 560 MT69P PA69P
MS(C) 56 MT72P PA72P MS(C) 58 FS-37 A MS(C)60 MT75P PA77P SFC series SMC series

5.855-6.360 5.855-6.455 5.855-6.455 5.855-6.455 4.0-6.5 5.0-6.6 3.6-6.855 6.355-6.855 6.425-6.925 6.425-6.925
6.425-6.925 6.8-7.2 6.8-7.2 6.800-7.200 4.0-7. 5 7.000-7. 525 7.055-7.525 7.055-7.7 50 4.0-8.0 4.0-8.0

28795-3 28795-4 MT80P MS(C) 62
6513 PA84P 28450-38 to -83 MT85P MS(X) 64
MT-240

6.0-8.0 6.0-8.0 7.5-8.0 7.500-8.000 8.38-8.42 7.75-8.47 3.6-8.5 7.975-8.5 7.975-8.500 6.0-9.0

LD-956
2 3 5008-9904 MT96 P EL-101-EL-l 16 EP-101-EP- l 16
438 444 6054-9901

8.940-9.220 8.75-9.4
9.1-9.4 9.25-9.55 90-9.6 1.2-9.7 1.2-9.7
8.5-9.7 8.5-9.7 9.2-9.72

Tuning
Range
(MHz)
350 350 1300 300 600 600 600 630 30% 30%
15% p 1000 6% 10% 20% 40% 2600 octave 600
1500 500 500 500 100-300 p p 10% 1% 500
100 1% 2000 0.5 10% p 250 500 p 250
505 600 600 600 1% 1600 300-500 500 500 500
500 400 400 400 500 525 470 695 0.1 % 1%-15%
750 200 500 1500 40 720 300-525 525 525 150
p 650 300 300 600 600 600 400 400 520

Output Power Min-Max (mW)

Notes

50 min g lOmin g 30 min q 50 min g lOmin beg 10 min bet 10 min g 50 min g 20 min jn 20 min In

10-15 hq

5-15

50 typ i
350 typ hq

250 typ hq

150 typ hq

50 typ i
50 typ q

50 typ q

25 min q lOmin g 50 typ q 1000 typ cq
10-100 i
10 min cij 10 min cij 100-250 hqr 150-400 ch 20 typ m

10-100 acjn

20 typ ch

1 typ

5 min gjn

50 max bhq

10 min fj

50 min g

8-20

1000 typ

50 min g

10 min beg

10 min bet

10 min g

4-7

20 min q

50 min CJn

50 min g

10 min beg

10 min bet

10 min g 10 min beg
10 min bet 10 min g 10 typ m 5 min g 10 min beg 10 min bet 10-1000 hij
10-250 hmn

25 typ q 50 typ q 10 min beg 5 min g 40 min c1q 10 min bet 10 min cjn 10 min beg 5 min g 10-100 acjn

15 min i

4-10

20-40 ac

50 min cq

10 min beg

10 typ n

10 typ q

20 max a

8-60

a(3)

Price
($)
req req 600 req req req req req req 1300
req 690 295-695 req req req req 295-695 req req
600 req req req 100-450 req req 1190 700 450
880 440 req 1200 req req req req req req
req req req req 340 600 515-825 req req req
req req req req 600 req req req req req
req req req req req req 475-880 req req 925
req req req req req 600 650 506 567 req

( tab l es continued on p. 11 2)

110

ELECTRONIC D ESIGN 25, December 6, 1970

·II

Government Designation
M55302/ 1-03 M55302/ 1-04 M55302/ 1-05 M55302/ 2-03 M55302/ 2-04 M55302/ 2-05
M55302/ 4-02 M55302/ 4-03 M55302/ 4-04 M55302/ 4-05
M55302/ 6-02 M55302/ 6-03 M55302/ 6-04 M55302/ 6-05
M55302/ 7-01 M55302/ 7-02 M55302/ 7-03 M55302/ 7-04 M55302/ 7-05
M55302/ 8-0l M55302/ 8-02 M55302/ 8-03 M55302/ 8-04 M55302/ 8-05
M55302/ 19-01
M55302/ 20-01
M55302/ 21-01
M55302/ 22-01

Burndy Part Number
UPC2A17P4 UPC2A23P4 UPC2A28P4 UPC2A17R4 UPC2A23R4 UPC2A28R4
UPC2B17P4 UPC2B25P4 UPC2B33P4 UPC2B41P4
UPC2817R4 UPC2B25R4 UPC2B33R4 UPC2841R4
UPC3813P4 UPC3825P4 UPC3837P4 UPC3B49P4 UPC3861P4

The current Mil E-5400L specifies the use of twopiece printed circuit type connectors for airborne military applications. At the same time, recent additions to Mil STD-454, requirement 10, specifically call out the Mil C-55302 connector series. Burndy has them in stock, ready for delivery. Just call your nearest Burndy electronic distributor or Burndy Sales Office .

"° BURNDV V

Norwalk, Connecticut

UPC3813R4 UPC3825R4 UPC3837R4 UPC3B49R4 UPC3861R4

UPC2A41P-4

UPC2A41R-4

UPC3892P4

UPC3892R4

· INTERNATIONAL SALES HEADQUARTERS & MANUFACTURING FACILITIES : CANADA I ENGLAND I BELGIUM I MEXICO I BRAZIL I JAPAN I Sales Offices in Major Cities 70-32

INFORMATION RETRIEVAL NUMBER 57

ELECTRO IC DESIGN 25, December 6, 1970

111

Microwave Oscillators, Solid-State (transistor)

159

Manufacturer
Trak Green ray Freq. Sources Zeta Zeta Zeta Freq. Sources Bradley/Edwin Omni Spectra Bradley/Edwin
Airtran Calif. Micro. Calif. Micro. Freq. Sources Freq. Sources Freq. Sources M-0/MOSC Freq. Sources Freq. Sources Bradley/Edwin Calif. Micro.
Calif. Micro. Fairchild Calif. Micro. Calif. Micro. Yig-Tek Omni Spectra Engelmann Omni Spectra Calif. Micro. Calif. Micro.
Fairchild Applied Tech. App Iied Tech Marconi Fairchild

Model

Operating Frequency
Range (GHz)

5008-9901

8.5·9.76

EY-101-EY-123 0.1·10.0

FS·22L

5.0· 10.0

4214

6.0· 10.0

4215

6.0· 10.0

4304

6.0·10.0

FS-17R

7.0·10.0

429

8.0·10.0

28796·5

8.0· 10.0

433

8.5·10.0

1 MT103P PA103P FS-37B FS-24
FS·24R SSX8 FS-18 FS-54
428 MT112P

9.5· 10.3 9.6·10.3 9.7·10.3 7.5·10.4
8.0· 10.4 7.0· 10.5 8.0· 10.5 4.8·1 1.0 7.5· 11.0 9.5·11.0 10.63· 11.23

PA 112P MS(X) 74 MT117P PA117P 473 28796·7 MT-260 28796·6 MT122P PA 122P
MS(X) 78 SF X series SMX series 6058 MS(K) 80

10.63· 11.23 10.630· 11.230 11.20· 11.77 11.20·11.77 1.0·12.0 8.0-12.0 9.0·12.0 10.0· 12.0 11 .63-12.23 11.63-12.23
11.630· 12.230 8.0· 12.4 8.0· 12.4 7.0·12.5 12.130-12.700

Tuning Range (MHz)
1260 p
p p p p
1% 400 1000 350
710 700 600 600 8% 1% 400 10% 10% 400 600
600 600 570 570 11,000 400 200 1000 600 600
600 0.1% 1%·15% 5500 570

Output Power Min -Max (mW)

Notes

10·30 cq

5-100 bi

5·15

10 min cij

5 min cij

10 min cij

10 typ ch

10 max a

10 typ q

15 max ae

8·20

abc

10 min beg

10 min bcf

5 typ

25-100 hqr

100 typ ch

8typ

acj

3·12

20 max bhq

10 max a

10 min beg

10 min bcf 10 min g 10 min beg 10 min bcf 0.001 min cd 20 typ q 10·50 acjn 10 typ q 10 min beg 10 min bcf
5 min g 10·500 hij 10·100 hmn 10 typ 5 min g

Price
($)
req 800 890 req req req 495 485 req 543
req req req 650 1290 850 req 850 req 495 req
req req req req 2000 req 980 req req req
req req req 1395 req

Manufacturer
MA Calif. Micro. Calif. Micro. Fairchild Calif. Micro. Calif. Micro. Applied Tech. Zeta M·O/MOSC Trak
Czlif. Micro. Calif. Micro. Calif. Micro. MA Trak Freq. Sources Freq. Sources Calif. Micro. Trak Trak
Trak Trak Trak Zeta Yig-Tek Engelmann Engelmann Zeta Applied Tech Applied Tech
Freq. Sources Freq. Sources Freq. Sources Tl Applied Tech. Applied Tech.

Model
8012-XF2 MT132P PA132P MS(K) 82 MT137P PA137P L0· 100 series 4305 SSJ9 5026-9200
MT140P MT142P PA142P MA·86K10 5025-2901 FS·48R FS-55 MT164P 5030-9202 5024-9200, 5024·9201
5000-9200 5030-9201 6056-9201 4406 483 CC-2000 series PL -2000 series 4216 SFK series SMK series
FS-35R FS-49 FS-204 MIC· 100 X0· 100 series X0-101 series

Operating Frequency
Range (GHz)
8.5· 13.2 12.63-13.20 12.63· 13.20 12.630-13.230 13.13-13.70 13.13-13.70 3.5·14.0 10.0-14.0 12.0·14.0 12.0-14.0
13.97-14.03 13.63-14.23 13.63-14.23 15.2· 15.5 15.5·15.8 14.0·16.0 14.0·16.0 16.1· 16.4 16.1 -16.4 16.0·16.5
16.5 16.0-17.0 16.0·17.06 16.5· 17.5 2.0· 18.0 3.6-18.0 3.6· 18.0 10.0· 18.0 12.0· 18.0 12.0-18.0
12.4· 18.0 14.0· 18.0 12.4· 18.0 32.1·33.1 90·110 90·110

Tuning Range (MHz)
20 570 570 600 570 570 0.1% p
250 ina
60 600 600 250 ina 300 2% 300 300 ina
p
ina 1060 1000 16,000 10% 10% p
0.1% 1%-15%
1% p
8% 1000 0.1% 0.1%

Output Power Min·Max (mW) Notes

5 typ

10 min beg

10 min bcf

5 min g

10 min beg

10 min bcf

50 max hij

10 min cij

5 typ

acjq

250

10 min beg

10 min bcf

2·8

100 min i

5 typ

20 max bhq

10 min beg

4·36

20 typ i

50 min i

12-60 q

5-15

a (3)

20 min cq

0.0001 min cd

10 min cjn

10 min cfjn

10 min cij

10-250 hij

2-100 hmn

40 typ ch

5 typ

20 typ hqr

10 min c

40 typ hij

40 typ hijk

Price
($)
req req req req req req req req req req
req req req req req 980 req req req req
req req req req 2000 req 1300 req req req
1700 1230 1700 2400 req req

Microwave Oscillators, Solid-State (Gunn)

...:.

Operating

Output

Frequency Tuning Power

Range

Range Min·Max

Price

Manufacturer

Model

(GHz)

(MHz)

(mW) Notes ($)

Manufacturer

Model

RCA RCA
RCA RCA RCA RCA RCA lntradyne
RCA RCA

S257 S254
S256 S190 S170
S170V100 S208 OD30CV S195 S285

1.44-1.54 1.67· 1.69 1.67·1.69 1.20-1.90 1.30·2.00 1.30·2.00 1.90·2.10 4.30 4.20·5.20 5.6

150 typ

req

50 typ

req

100 typ

req

220 typ

req

200 typ

req

220 typ

req

240

50 typ

req

60·500 5·20

bjq 534

25 typ

req

125 typ

req

IMC Trak W-J Fairchild RCA RCA RCA RCA RCA RCA

SOA-9200-15 6900-1900 WJ-5008·4 GO(X)lOO S278 S279 S30 1 S303 S305 S307

lntradyne RCA RCA RCA RCA lntradyne lntradyne Cayuga Cayuga Cayuga

OE65CV
S323 S325 S327 S329 OF67CV OH75CV CA6C01 CA6C02 CA6C03

5.65 4.0·6.0 4.0·6.0 4.0·6.0 4.0·6.0 6.67 7.75 4.0·8.0 4.0·8.0 4.0·8.0

60·500 5-20

bjq 534

10 typ

200

30 typ

250

60 typ

300

120 typ

400

60-500 5-20

bjq 534

60·500 5·20

bjq 575

500

10·25

300

500

25-50

325

500

50-100

375

RCA RCA lntradyne lntradyne Marconi PEL
Nippon MA RCA Monsanto

S229 S293 OK05CV OK45CV 6061 OX-105
LD4006 MA8010-XF5 S289 VX1414SP

Monsanto

PEL

Varian/Calif.

RCA

RCA IMC

lntradyne

RCA

RCA RFD

I ntradyne Mu Ila rd

VC1414 VC1717 VC2020 OC-102 VSC-9009 series S324 S326 S328 S330 SCA-7580· 15
0175CV S262 S272 S283 S291 XC2001

4.0·8.0 4.0·8.0 4.0·8.0 4.0·8.0 4.0-8.0 6.0·8.0 6.0·8.0 6.0·8.0 6.0·8.0 7.0·8.5
8.75 8.75 8.75 8.75 8.75 8.0·9.0

OJ25CV

9.25

CL8300,

9.4

CL8310

p p p 4000 400 p p p p 500

25 min

50 min

100 min

0.5 min bd

25 min n

10 typ

30 typ

60 typ

120 typ

5· 15

60-500 5-20

bjq

20 typ

200

20 typ

200

100 typ

200

200 typ

1000 mec~ 20 min b I 1)

100 elec.

60-500 5·20

bjq

100 mech . 3 typ

200 elec.

268 329 400 req 270-420 200 250 300 400 450
575 req req req req 560
575 420

Monsanto Monsanto Fairchild Mu Ila rd Freq. Sources W-J Nippon RCA Freq. Sources Mu Ila rd
Monsanto
Fairchild lntradyne Freq. Sources Monsanto RCA RCA ~ CA RCA

VX1717SP VX2020SP GO(X)10 1 CL8630 FS-51 HP WJ-5008·3 LD4030 S294 FS-52 CL8360
VX2727ET
GO(X) 102 OL75CV FS-51 VX1010ET S302 S304 S306 S308

Operating Frequency
Range (GHz)
8.5·9.6 8.5·9.6 8.5·9.6 8.2·9.7 8.0·10.0 8.0-10.0 8.0· 10.0 8.0·10.0 8.0·10.0 8.0·10.0
9.0·10.0 10.0 10.05 10.45 8.0·10.5 8.5· 10.5 9.500· 10.500 10.525 10.525 10.50· 10.55
10.50· 10.55 10.50· 10.55 9.1·10.6 10.69 7.0-11.0 7.0· 11.0 9.000· 11.000 11.0 5.0· 11.5 8.5· 11.5
11.5
10.2· 11.7 11.75 5.0·12.0 B.0·12.0 10.0·12.0 10.0-12.0 10.0· 12.0 10.0· 12.0

160

Tuning Range (MHz)

Output Power Min-Max (mW)

500 1100 1100 1500 270 450 p p p p

5-15 3 min 20 min 50 typ 1 typ 5 typ 10 typ 30 typ 60 typ 120 typ

p 600 60·500 60·500 2500 2000 >400 100 p 100

12 typ 15 typ 5-20 5·20 5 typ 10 min 100 min 100 typ 30 typ 25 min

100 100 1500 p 200 4000
>500 1000 1100 1000

50 min 100 min 50 typ 8 typ 150 typ 10 min 20 min 15 typ 10 typ 5 typ

1000mech 500 min

30 elec.

1500

50 typ

60-500 5·20

1100

5-25

100

10 min

10 typ

30 typ

60 typ

p l

120 typ

Notes bj d b
bjq bjq v bd n
n n n b
d n q n b b bjq b u

Price ($)
450 req req req req req 200 250 300 400
req req 575 575 250 req 900 req req 152
192 230 req 44 req req 360 req 850 210
950
req 575 360 495 200 250 300 400

11 2

ELECTRON IC D ESIGN ·25. D c<.:l! lll ber 6, 1970

Microwave Oscillators, Solid-State (Gunn)

161

Manufac tu re r

Model

Operating Frequency
Range (GHz)

Outpu t

Tuning Power

Range Min·Max

Price

(MHz) (mW) Notes ($)

PEL Varian/Calif. Varian/Calif.
Varian/Calif. Varian/Calif. W·J Yig·Tek Cayuga Cayuga

OX-102

8.0· 12.4

VSX-9001 series 8.0· 12.4

VSX-9011 series 8.0· 12.4

VSX·9070 series 8.0· 12.4

VSX-9071 series 8.0· 12.4

WJ-5008

8.0· 12.4

340

8.0·12.0

CA6X01

8.2· 12.4

CA6X02

8.2· 12.4

4400

10 min bd

1000

25 min n

500 mech. 25 min nq

20 elec.

4400

5 min d

4400

5min d

4400

10 min d

4000

5min d

1000

10·25

1000

25-50

req 225·350 395-450
1490· 195~ 1590.2m;q req 1500 300 325

Cayuga Cayuga Hitachi Monsanto Nippon Fairchild lntradyne lntradyne IMC MA
MA
lntradyne lntradyne Nippon Monsanto Monsanto Monsanto

CA6X03

8.2· 12.4

1000

50-100

375

CA6X04

8.2· 12.4

1000

100·200

425

X8001

8.2· 12.4

4200

5min bt

158

VX2020C

8.2· 12.4

20%

100 min bhn 420

L04027

8.200· 12.400 p

10 min

115

GO(X)103

10.9· 12.4

1500

50 typ b

req

OM50CV

12.50

60·500 5·20

bjq 660

OM95CV

12.95

60·500 5·20

bjq 660

SOA· 12000· 15 10.0· 13.0

500

5·15

450

MA8010·XF series 10.7-13.2

500

1·6

450

MA8012·XF series 10.7· 13.2

500 mech. 1·6

500

10 elec.

ON25CV

13.25

6().500 5·20

bjq 660

ON95CV

13.95

60·500 5·20

bjq 660

L04013

12.500· 14.500 >500 50 min n

450

VU1414A

12.5-15.0

500

25 min n

268

VU1717A

12.5·15.0

500

50 min n

329

VU2020A

12.5-15.0

500

100min n

400

Manufacturer
MA
w.J lntradyne lntradyne Philco W·J Freq. Sources Yig-Tek Cayuga
Cayuga Cayuga PEL Varian/Cal if. Varian/Calif.
Varian/Calif. Varian/Cal if. W-J Monsanto
Monsanto Monsanto Nippon Micromega Micromega Varian/Calif. Varian/Calif.

Model

Oper ati ng Frequency
Range (GHz)

MA8012·ZF2 15.9· 16.4

WJ-5041 ·5 0050CV OR85CV P8061 WJ-5041·4 FS·51K 350 CA6U02

15.5-16.5 16.50 17.85 5.0· 18.0 10.CJ.18.0 12.0· 18.0 12.0·18.0 12.4· 18.0

CA6U03

12.4· 18.0

CA6U04

12.4-18.0

OKu-102

12.4· 18.0

VSU-9002 series 12.4·18.0

VSU-9012

12.4· 18.0

VSU -9170 VSU-9 171 WJ-5041 VU1414B

12.4-18.0 12.4· 18.0 12.4· 18.0 15.0-18.0

VU1717B

15.0·18.0

VU2020B

15.0- 18.0

L0-960

19.000-23.000

GSF series

8.0-26.5

GSM series

8.0-26.5

VSK-9004 series 18.0·26.5

USA-9010 series 26.5-40.0

Output

Tuning Power

Range Min·Max

Price

(MHz) (mW) Notes ($)

500 mech. 2·8

40 elec.

1000

20 min d

60·500 5·20

bjq

60·500 5-20

bjq

1000

50 min

8000

3 min

1000

5 typ

6000

5 min d

1000

10-25

1000

25-50

1000

50-100

5600

10 min bd

1000

25 min n

750 mecl:. 25 min nq

20 elec_

5600

5 min

5600

5 min

5600

7 min d

500

25 min n

500

50 min n

500

100 min n

50 min

300·400 15·100 n

1000

15·100 jn

1000

5min

1000

10 min n

req
req 800 800 req req 650 1500 325
375 425 req 595-695 795
2340 2440 req 300
370 441 570 425·800 375-750 555-795 1500

Microwave Oscillators, Solid-State (avalanche)

Manufacturer

Model

Operating Frequency
Range (GHz)

TOutput

Tuning Power

Range Min-Max

Price

(MHz) (mW) Notes ($)

Manufactu rer

Model

Ope rati ng Frequ ency
Range (GH z)

Varian/Mass. Varian/Mass. Micro State
Varian/Mass. Varian/Mass. Varian/Mass. Varian/Mass. Varian/Mass. Varian/Mass.
Varian/Mass. Varian/Mass. Varian/Mass. Varian/Mass_ Varian/Mass _ Varian/Mass. Varian/Mass. Varian/Mass. Varian/Mass. Freq. Sources

VSC·9520K
cVSC·9520P
VSJ·9524PT VSJ-9524 0T VSH-95011 VSH-95011T VSH·9501J VSH·9501JT
VSH-9501 K VSH·9501KT VSH-9501 L VSH ·9501LT VSH ·9501M VSJ -9521P VSJ.95210 VSX-95220 VSX·95230T FS-40

3.95·5.85 3.95·5.85 4.0·8.0
5.85-8.2 5.85-8.2 7.0-8.2 7.0·8.2 7.0·8.2 7.0·8.2
7.0·8.2 7.0·8.2 7.0·8.2 7.0-8.2 7.0-8.2 5.85-8.26 5.85-8.26 8.2-10.0 8.2· 10.0 5.4· 12.0

100 min (4) req

500 min (4) req

10% mech. 1000 max w

req

5% elec.

100

500 min (4) req

300

1000 min (4) req

25 min (5) (7) 195

200

25 min (5) (7) 250

50 min (5) (7) 225

200

50 min (5) (7) 295

100 min (5) (7) 275

200

100 min (5) (7) 350

150 min (5) (7) 350

200

150 min (5) (7) 425

200 min (5) (7) 425

500 min (4) req

1000 min (4) req

500

1000 min (4) req

200

10·100

330

Sylvania Sylvania Sylvania Sylvania Sylvania Varian/Mass. Var ian/Mass. Varian/Mass. Varian/Mass. Varian/Mass.
Varian/Mass. Varian/Mass. Varian/Mass. Varian/Mass. Varian/Mass. Varian/Mass . Varian/Mass. Varian/Mass. Varian/Mass. Varian/Mass.

SYA·3205B SYA-3206 SYA-3206A SYA-32068 SYA-3220 VSX·9501HT VSX-95011 VSX-95011T VSX -9501J VSX·9501JT
VSX ·9501K VSX ·9501KT VSX ·9501L VSX·9501LT VSX -9501M VSX -9501MT VSX ·9501N VSX·9522P VSX·9523PT VSX·9540K

8.2-12.4 8.2· 12.4 B.2-12.4 8.2· 12.4 10.525 8.2· 12.4 8.2· 12.4 8.2· 12.4 8.2-12.4 8.2-12.4
8.2· 12.4 8.2· 12.4 8.2· 12.4 B.2-12.4 B.2· 12.4 8.2· 12.4 8.2-12.4 8.2· 12.4 8.2· 12.4 8.2· 12.4

Freq . Sources Freq. Sources Micro State
Cayuga Hughes Hughes Hughes Hughes AEL

FS-42 FS-2 10
x
CAX050 44010H 44012H 44013H 44014H AV01658

5.4·12.0 6.0· 12.0 8.0· 12.0
8.0· 12.4 8.0· 12.4 8.0· 12.4 8.0· 12.4 8.0-12.4 8.2· 12.4

2000

10 typ

525

4000

5 typ

995

10% mech. 1000 max w

req

5% elec.

1000

25 min

300

500

250 min n

600

500

100 min n

450

500

500 min n

720

300

5 min a

720

10 min

350

Varian/Mass. Philco Philco Varian/Mass. Varian /Mass. Varian/Mass . Varian/Mass. Philco Micro State

VSX·9540P P8516 P8518 VSU·9540P VSU·9502L VSU·9502L T VSU ·9502M P8051 Ku

9.0· 12.4 11.0-14.0 11.0-14.0
12.4· 15.0 12.4-16.0 12.4· 16.0 12.4-16.0 5.0-18.0 12.0· 18.0

OKI OKI OKI Philco Philco Sylvania Sylvania Sylvania Sylvania Sylvania
Sylvania Sylvania Sylvania

AOC· 1Oseries AOS· 10 series ADW· 10 series P8511 P8513 SYA-3200 SYA·3200A SYA·3200B SYA·3201 SYA-3201A
SYA·3201B SYA-3205 SYA·3205A

8.2· 12.4 8.2- 12.4 8.2· 12.4 8.2· 12.4 8.2· 12.4 8.2· 12.4 8.2· 12.4 8.2· 12.4 8.2· 12.4 8.2- 12.4
8.2· 12.4 8.2· 12.4 8.2· 12.4

500 500 500 1000 1000 500 500 500 500 500

50-150 60·150 bz 60·250 50 min n 100 min n lOmin 25min 50 min 10 min 25 min

500

50 min

500 min 100 min (1)

200 min 250 min ( 1)

270-440 545.725 270-700 req req 180 195 225 180 195
225 250 390

Cayuga Philco Philco Varian/Mass. Varian/Mass. Varian/Mass. Varian/Mass. Varian/Mass. Varian/Mass. Var ian/Mass.
Varian/Mass. Cayuga Hughes

CAU050 P8521 P8579 VSU·9502HT VSU -95021 VSU -95021T VSU·9502J VSU·9502JT VSU·9502K VSU·9502KT
VSU·9540K CAK050 44016H

12.4-18.0 12.4-18.0 12.4-18.0 12.4-18.0 12.4· 18.0 12.4-18.0 12.4-18.0 12.4· 18.0 12.4· 18.0 12.4· 18.0
12.4· 18.0 18.0·26.5 53.0-67.0

162

Output

Tuning Power

Range Min-Max

Price

(MHz)

(mW) Notes ($)

150 min 500 min 200 min 150 min
50 1000 p 200 p 200

500 min 100 min 250 min 500 min 100 min 10 min 25 min 25 min 50 min 50 min

100 min

200

100 min

150min

200

150 min

200 min

200

200 min

250 min

500 min

500

500 min

100 min

500 min

1000

10 min

1000

50 min

500 min

150 min

100

150 min

200 min

1000

50 min

10% mech 300 max

5% elec.

1000 1000 1000 1000 p 200 p 200 p 100

25 min 100 min 50 min 10 min 25 min 25 min 50 min 50 min 100 min 100 min

p 1000 10,000

100 min 15 min 5·30

(1) 480

(1)

250

( 1)

390

( 1)

480

125

(5) (7) 350

(5) (7) 195

(5) (7) 225

(5) (7) 250

(5) (7) 275 (5) (7) 350 (5) (7) 350 (5) (7) 425 (5) (7) 425 (5) (7) 495 (5) req
(4) req
(4) req
(4) req

(4)

req

(4)

req

(7) (5) 595

(7) (5) 750

(5) (7) 750

req

n n (5) (7) (5) (7) (5) (7) (5) (7) (5) (7) (5) (7) (5) (7)
(4)
a

350 req req 425 275 350 350 450 525 595
req 425 2950

a. Electronically tuned b. Low-noise unit c. Oscillator-multi plier unit d. YIG·tuned unit e. Offers centralized tuning
voltage swing
(1) Temperature-compensated unit (2) Super-G (shock-resistant) unit

f. Features phase lock g. Free-running unit h. Tuning-range percentage represents · distance from center frequency i. Crystal-controlled oscillator j. High-stabili ty unit
(3) Crystal-controlled fixed-frequency model available

k. Vibration-isolated unit m. Cavity-stabilized oscillator n. Mechanically tuned p. Fixed tuned q. Voltage-tuned oscillator r. Linear-tuned unit
(4) Low- 0 unit (5) High-0 unit

s. Includes magnetic shielding and protective circuitry
t. Features long life u. Microstrip unit v. Features micrometer-head tuning w. High-efficiency unit
(6) Oscillator buffer ampli fier (7) Also available from Varian/Calif

x. Features calibrated dial y. Sweep oscillator z. Coupled-cavity un it

ELECTRO IC DLSIGN 25, Dei.:ember 6, 1970

113

1sl PRIZE
FRIDl!N MODEL 1182 PROQRAMMABLB PRINTING CALCULATOR
......

Friden Electronic Display Calculator

Friden Adding Machine

EICO "Light Fantastic"

Bulova Accutron® Timepiece

Stnd. Dictionary of Computers and
Information Processing

HERE'S ALL YOU HAVE TO DO TO ENTER:
(1) Examine the January 7 issue of Electronic Design with extra care. (2) Pick the ten adverisements that you think will be best READ by your fellow engineer-subscribers. (3) List these advertisements (in the rank order you think our reader! will select them) on the special entry form bound in the January 7 issue. Your Top Ten list will be compared with the ten ads ranking highest in the "Recall READ MOST" category of Reader Recall-Electronic Design's method of measuring readership.
CAUTION: In other years, your rankings were judged on the basis of "Recall Seen" scores. This year they will be judged on the basis of "Recall READ MOST" scores. This means that some striking ads will step back in favor of those offering greater content and usefulness to the reader.
Test your skill! See if you can pick the Top Ten ... valuable prizes are waiting for the winners.

.---------------PRIZES-R·AD·R CONT·ST----------------.

l'IRST PRIZI!:

FRIDEN MODEL 1152 PROGRAMMABLE PRINTING CALCULATOR

a EICO "LIGHT FANTASTIC"
4th 11th PRIZES: COLOR-IMAGE AUDIO LIGHTING SYSTEM

FRIDEN MODEL 1114 S·COND PRIZE: ELECTRONIC DISPLAY
CALCULATOR

THIRD PRIZE:

FRIDEN MODEL 213 ADDING MACHINE (with automatic recall)

8th through 13th PRIZES1

BULOVA ACCUTRON® "SPACEVIEW" ELECTRONIC WRIST TIMEPIECES

14th through 78th PRIZ·S:

COPIES OF THE "STANDARD DICTIONARY OF COMPUTERS AND INFORMATION
PROCESSING." Martin H. Weik,
326 pp.

COMPLETE INFORMATION, RULl:S, AND ENTRY BLANKS WILL APPEAR IN ELECTRONIC DESIGN'S JAN. 7 ISSUE

Motorola's Ponderous Pachyderm Syndrome

Why Ponderous Pachyderm? Motorola typically moves slowly and
carefully into new product categories, planning, examining, and developing sure, reproducible processes before total commitment. This has been our history, and we have applied the same approach to MOS.
Motorola already offers a selection of standard MOS devices in both high threshold and low threshold P-channel MOS, matched by a growing line of Complementary MOS types. Included are gates, flip-flops, multiplex switches, memories, counters, general purpose logic elements, and dynamic and static shift registers. These will be joined before the end of the year by several Silicon-Gate MOS shift register and memory introductions to launch our capability in this significant area. And our Polycell LSI program is in full swing for the design of custom MOS. For perspective,

what does the pachyderm syndrome indicate?
We were deliberate in entering the silicon transistor business. We made the commitment. Who has supplied more silicon transistors since!
We were slow with RTL and DTL. We made commitments. Who has supplied more RTL and DTL since!
We waited before committing to Linear circuits. We committed. Who has delivered more Linear circuits since!
We delayed on MOS. Then in the first six months of 1970 we increased our design capability, our production capacity, an·d our deliveries by 10 times. Now we are committed!
Ask us to back this up by telling us your MOS product interests. If you have a problem, we'll offer assistance. Write to Motorola Semiconductor Products Inc., P. 0. Box 20912, Phoenix, Arizona 85036.

ELECTRONIC D ES IGN 25 , Decem b er 6, 1970

MOTOROLA MOS
-the broad line is our specialty
INFORMATION RETRIEVAL NUMBER 58
115

14 -76

that laughs at shock and environment

Space savings of up to 40 %. A one-piece dense epoxy resin case which is self-insulated and provides complete environmental protection . High shock and vibration resistance due to the elimination of all voids . Precision dimensioned for high-density packaging . Great flexibility in mounting positions and lead options, and ideal for automatic insertion .
These are just a few of the
116

advantages offered by the TRW Type 935 tantalum capacitor. In addition , they are remarkably inexpensive , due to the high speed molding techniques used in their production .
The versatile 935 is available from 6 through 50 volts , and from .004 7 to 56 mfd . It is designed to operate from - 55 °C to + 85 °C at full rating , and up to + 125° C
with Y:i derating.
For complete information and

technical data, contact TRW Capacitor Division , Box 1000, Ogallala, Nebraska. Phone: (308) 284-3611 .TWX: 910-620-0321 .
TRW

INFORMATION RETRIEVAL NUMBER 59

E L ECTRO NI C D ES IGN 25 , Decembe r 6, 1970

new products

Low-cost hybrid op amp DIP 12-bit ladder lowers bias to 0.01 pA tracks to 1 ppm/°C

IC sense amplifer cuts threshold to 4 mV

lntersil, Inc., 10900 N. Tantau Ave., Cupertino, Calif. Phone: ( 408) 257-5450. P&A : $42.50, $40 .35; stock.
Constructed of monolithic and discrete components in a T0-5 can, the new low-cost hybrid ICH8500A operational amplifier features very low input bias currents of less than 0.01 pA.
The very low input currents are achieved by an isolation technique that allows the case to follow the applied input voltage. This prevents any leakage from the case to the input pin which would result if the case were at ground or collector-supply-voltage levels.
The ICH8500A is frequency compensated internally, has a 5-mV input offset voltage, an adjustable offset voltage range of ± 25 mV and a common-mode rejection ratio of 60 :1.
Closed-loop frequency response of the new amplifier can be made flat to 100 kHz. Open-loop frequency response is flat to 20 Hz. Other characteristics include input offset-voltage null capability, shortcircuit protection, 500-mW power consumption and pin-for-pin compatibility with popular type 741 operational amplifiers.
Large-signal voltage gain is 20,000 and output-voltage swing is
± 12 V. Slew rate is 0.5 V I µ,s and
long-term stability for the input offset voltage is ± 3 mV.
A lower-priced version of the ICH8500A is the ICH8500 which is identical to the ICH8500A except for a bias current of 0.1 pA.
CIRC LE NO . 250

Micro Networks Corp., 5 Barbara Lane, Worcester, Mass. Phone : (617) 756-4635 . P&A: $69; stock.
The MNlOO is a precision nickelchromium ladder network in a 16lead flatpack or a 16-pin DIP providing temperature tracking from
- 50 to + 125 ° C of typically less
than 1 ppm /° C. Accuracy is 0.0122 %, ± 1/ 2 bit for 12 bits over the full temperature range of - 50
to + 125 °C. The MNIOO is design-
ed to meet the requirements of MIL-STD-883.
CIRCL E NO . 25 1
Six MOS/ LSI ICs comprise calculator logic
Electronic Armys, Inc., 501 Ellis St., Mountain View, Calif. Phone: (415 ) 964-4321.
The S-100 set of six MOS/ LSI circuits, provides the entire electronic logi c required to build an eight-digit four-function calculator. The six MOS circuits packaged in 24-pin dual-in-line packages are an input chip, a register chip, an arithmetic chip, a read-only memory, a control logic chip and an output chip. Chip die sizes range from 82 by 88 to 90 by 100 mils.
CIRCLE NO. 252

ELECTRONIC DESIGN 25, December 6, 1970

'-Nucleonic Products Co., 6660 Variel Ave., Canoga Park, Calif. Phone :: (213) 887-1010. Availability: stock to 6 wks.
A new sense amplifier for readonly memories is the Sescosem SFC2003 with a low threshold voltage of just 4 mV. Other features of this 16-pin IC are dual channels with input selection, variable threshold from 4 to 12 mV, output register and DTL/ TTL-compatible outputs. Propagation time is 25 ns.
CIRC LE NO. 253
Universal multiplexer ups versatility
General Instrument Corp., 600 W. John St., Hicks ville, N. Y. Phone:· (516) 681-8000 . Price : $32.
The AY-1-4016 is a fl exible universal multiplexer composed of a 4-stage binary counter, a 4-by-16 decode matrix and 16 spdt switches. It permits current or voltage modes of operation and provides matching resistors to improve accuracy. Interface is availa\.Jle to TTL/ DTL and MOS families. Random or sequential-access and single-ended or differential modes are possible.
CI RC LE NO . 254
117

ICs & SEMICONDU CTOR S

Read-only memories access in 350 ns
Thin-film chip resistors stablize to ±50 ppm/°C
Flatpack diode quad is matched to 1 mV
Miniature sealed diode handles 20 kV at 1 mA
118

Intersil, Inc., 10900 N. Tantau Ave., Cupertino, Calif. Phone: (408) 257-5450. P&A: from $1.14 to 2.6¢/bit; stock.
A new fami ly of 1024, 2048 and 2560-bit fully decoded static MOS read-only memories with sense amplifier on the chip features a typical access time of 350 ns. The 7600 memories are p-channel units that are programmed by changing one mask during fabrication. Features include bipolar compatibility and low power consumption of 360 mW.
CIRCLE NO. 255
Sloan Micro electronics, Div. of Sloan Technology Corp., 139 Maryland St., El S egimdo, Calif. Phone: (213) 322-9340.
Two new thin-film chip resistors feature stability of 0.05 %/ 1000 hours and a temperature coefficient of ± 50 ppm /° C. The resistors are 30-mils square and are available in 5-n to 500-kn values in two patterns: a center tap with two matched resistors and a pattern containing 12 bonding points permitting selection from 1 to 110 squares.
CIRCLE NO. 256
Mini-Systems, Inc., David Rd., N . Attleboro, Mass. Phone : (617) 6950206. P&.4.: $9 .50; stock.
Four diodes matched to within a forward voltage of 1 mV make up the monolithic 0.175-in-dia MS214 sealed diode array flatpack. E,ach diode is dielectrically isolated and is rated for 100 mA maximum. Reverse voltage is 60 V minimum at 100 µ,A and reverse current is 25 nA maximum at 50 V. Reverse recovery time is 300 ns.
CIRCLE NO. 257
Codi S emiconductor Div., Computer Diode Corp., Pollitt Dr., Fairlawn, N. J. Phone: (2 01 ) 797-3900. Price : $2 to $9.50.
F eaturing a maximum dia of 0.1 in. and a length of only 0.5 in., a new solid-state diode handles 20 kV at a 10-mA current rating. It meets or exceeds MIL-S-19500 specifications and can be designed into circuits which can later be epoxyencapsulated. It has a recovery time ranging from 100 to 300 ns.
CIR CLE NO. 258

MOS 1024-bit memory accesses in 300 ns
Intel Corp., 365 Middlefi eld Rd., Mountain View, Calif. Phone: (415) 969-1670. P&A: $60; stock.
Fu lly decoded on the chip, the low-cost 1103 MOS/ LSI 1024-bit dynamic random-access memory has an access t ime of 300 ns and power dissipation of 400 mW. Its cycle time is 580 ns, it refreshes every 2 ms and operates over the temperature range of 0 to +70°C. The new memory is construded as 1024 words by 1 bit and allows simple memory expansion with a chip enable lead. It is a low-threshold pchannel silicon-gate device.
CIRCLE NO . 259
Line driver/receivers meet three specs
Signetics Corp., 811 E. A r ques Ave., Sunnyvale, Calif. Phone : ( 408) 739-7700. Price : $3.75 ( 100999 ) .
Two new monolithic communication ICs, the 8T15 dual line driver and the 8T16 dual line r eceiver, meet specifications EIA RS-232, MIL STD 188 and international specification CC ITTV24. The 8T15 is a dual 4-input N AND driver that accepts TTL inputs and drives interface lines with ±6-V outputs. The 8T16 is a dual line receiver that accepts single or double-ended inputs and has a 6-V output.
CIRCLE NO. 260
Second-source ICs lower bias to 1 nA
Silicon General, Inc., 7382 Balsa Ave., W estminst er, Calif. Phone: (714) 839-6200 . P&A : $3.25 (SG310 ); stock.
Second-sourced model SG110/ 210 / 310 IC voltage followers ~re si licon monolithic amplifiers which exhibit a low 1-nA input bias current. They are internally connected as unity-gain non-inverting amplifiers and have input resistances of
1012 n . Features include internal
frequency compensation and offset balancing.
CIRCLE NO . 26 1
INFORMATION RETRIEVAL NUMBER 60 ....

does a man-s1 switching -job
Peewee may be pea-sized, but behind that low space-saving profile there's enormous switching capability. Daven' new printed circuit Series P switch has all the inherent features of the famo Series G (MIL-S-3786/20) packed into a miniature unit, solderable directly to PC boards. Exceptionally reliable. Economical too. And versatile, with 36° spacing, shorting and non-shorting, one pole 2 through 10 positions, or 2 poles, 2 through 5 positions. Positive detent action.
Non-conductive, insulating surface. Completely sealed for immersion in cleaning solutions. Dry circuit conditions through 3 amps. carrying capacity,
with low contact resistance. Positionable screw driver slot with clearly marked terminals. For samples and Bulletin P write to Daven Division, McGraw-Edison Company, Manchester, New Hampshire 03101. (603) 669-0940. TWX 710-220-1747.
DAVEN

ICs & SEMICONDUCTORS
Digital IC multiplexer is a 3-position switch

IC transient suppressor rates 1500 W peak
I
I

Random-access memory accesses in 75 ns

Signetics Corp., 811 E . Arques Ave., Sunnyvale, Calif. Phone: ( 408) 739-7700. P&A: $1 5. 95 ; stock.
A new digital 3-input 4-bit multiplexer has a function analogous to a 4-pole, 3-position sw itch . Four bits of digital data are selected fro m one of t hree inputs . T wo vers ions ar e ava ilable: t he 8263 with active pull-u p outputs and the 8264 with bare-collector outputs .
CIRCLE NO . 262

General S emiconductor Industries, Inc., 230 W. 5th St., T empe, Ariz. Phone: (602) 966-7263 . P&A: $3.50; stock.
A new low-voltage silicon transient suppr essor fo r 5-V ! Cs is rated fo r a peak pulse power of 1500 W fo r 1 ms and has a peak clampin g t ime of 1 x 10-12 seconds. The ICT-5 protects TTL, E CL, DTL, MOS and MS I circuits . When properly used, it can replace crowbars and affords complete noise and voltage-surge immunity to logic circuits.
CIRCLE NO . 263

Intersil, 10900 N. T antau A ve ., Cupertino, Calif . Phone : ( 408). 257-5450. P&A: $57; stock.
The I M5503 I C is a 256-bit TTL bipolar random-access memor y with an access t ime of 75 ns, and low power dissipation of 1.5 mW/ bit . This monolithi c device is organized as 256 words by 1 bit and feat ures on-chip decoding along w it h chipselect write-enable and open-collector outputs. It is available in a 16-p in ceramic DIP.
CIRCLE NO . 264

Remu
is coming out of its stiell.
With an economy photoelectric punch tape reader.
See pages 133 & 135.
A UNIT or
"~X~ Le a
EX·CELL·O CORPORATION INFORMATION RETRIEVAL NUMBER 61
120

Test Clips
ia ~ PPuosshts
~
Stand·Off
Insula to rs rJ '
II Binding
. , Posts
Sockets

Test Clips Adjustable tension , threaded studs or plug in bases, various sizes .
Push Posis Plunger action lets you connect and disconnect quickly and easily, assures positive contact.
Binding Posts Screw type or spring loaded, banana plug o r stud mounting, single or multiple units, with va ri ous colors for circuit identification.
Stand-Off Insulators High d iele ctri c strength , low loss insulation, low mo istu re absorpt ion, various mounting styles.
Sockets Lamp o r t ransistor, various colors, various mountings includjng printed circuit.
Custom Molded Parts Tight tolerances provide you with " assembly reedy" units. Thermosettiog plastics to meet most specifications.

Plastic

Molded

For your Grayhi/I Eng ineering

Parts

Catalog offering complete technical

data- contact

I ,/rf!}f!! 565 Hillgrove Avenue LaGrange, Illinois 60525 Area Code 312, Phone 354-1040

. . . the Difference Between Excellent and Adequate

INFORMATION RETRIEVAL NUMBER 62
EL1:.CTRON IC D ESIGN 25, D ece mbe r 6, 1970

Our new m1cropower
op amp runs
off ±IV
with20µW
power consumption.

That's all.

Solitron's UC4250 micropower op amp uses so little power that its batteries will last as long as their shelf life. It needs so litt le vo ltage that only two single cells are needed . (Although it can handle up to ± 18v.)
The other specifications aren 't so bad either. 3 nanoamps input bias current with tempera-

tu re drift of zero nanoamps per degree C. 100 db gain into a 1OK load . And it's available now. From (who else?) Solitron .
Sol itron Devices, Inc.. P.O . Box 1416, San Diego , Cal ifornia 92112. Telephone 714 / 278-8780. TWX 910-335-1221 .

l~olitron DEVICES, INC.

For custom des igns or standards, contact Solitron , leader in semiconductors :

SAN DIEGO, CA L. 8808 Balboa Avenue
FET & Dua l FET Tra nsis1o rs MOS/ FET Devices MOS Me mory Arrays Sh ilt Reg1ste1s Mo no l 1th 1c IC's

RIVIE RA BEACH, FLA 1111 Blue Heron Blvd
H1 Rel Power Tr ansistors SI & Ge Power T ransis tors RF & small Signal Transistors PN P. NPN lndusl r1al Tra ns1sto1s
PORT SA LERN O, FLA Cove Road
Microwave Connectors

LONG ISLAN D CI TY. N Y 31.11 47th Ave
Microwave Components Bolometer Elemenls Ferflte & Ferrite Devices Microwave Sem1cond Pla111al (A) Cable Prec tsm n AF Coax

TAPPAN, N Y 256 Oak Tfee Road
Diodes & Rec111te,s Zeners High Voltage Assemblies Power Rec 11t1ers Thick Ftlm Hybnd C1rcm 1s

KENT, ENGLAND Tubs H1U House London Road, Sevenoaks
Sohdev. Lid Full line ol Sol1 1ron devices

BEN BAR CO, ISRAEL 5 1 Hayarkon Street
A EL Israe l , Ltd Full !me ot Sol1 1ron devi ces

TOKYO 105, JAPAN NO 5. 3-C home Sh 1bahama mat su-c ho M1nato- ku
Ma1sush 11a Ele c1ric Tra d i ng Full line ot So 111ron devices

INFORMATION RETRIEVAL NUMBER 63

EL ECTRON IC D ESIG 25, D ece mbe r 6, 1970

12 1

MICROWAVES & LASERS
Phototransistor sensor is truly miniature

Bright tiny GaP lamps use low drive currents

Iridium Platinum
Iridium Platinum is probably the best known alloy in the Platinum metal family. By varying the Iridium content from 5% to 40%, a very wide range of physical and electrical properties is obtained .

HE!, Inc., Jonathan Industrial Center, Chaska, Minn. Phone: (612) 448-3510. P&A: $1.51, $1.86; stock.
The new HT series Micro Sensor is an ultraminiature photosensor consisting of either a phototransistor or a photoDarlington sensor bonderl to a ceramic substrate with three leads attached (emitter, base and collector). Two different semiconductors are available: the HT700 series offers low cost and fast switching speeds; the HT-800 series has high gain and high se nsitivity.
CIRCLE NO . 265
Thin-film amplifiers operate to 500 MHz

OPCOA, Inc ., 330 Talmadg e Rd., Edison, N. J . Phone : (201) 2870355 . Availability: stock.
The new tiny red GaP LED ICcompatible Solid-Lite lamps produce two mi llicandelas of luminous intensity at only 15 mA of drive current. Two models are avai lable: OSL-1 provides 180-degree viewing with excellent visibility and OSL-2 features higher luminous intensity with a narrower viewing angle. Both are 100-mil-dia assemblies .
CIRCLE NO . 267
3-Mbit/s optical links transmit to 8 miles

Diameters available range from rod sizes down to 0.0005" and, in some alloys, to 0.0002" . With alloys high in Irid ium, fa ntastic tensi le strength can be obtained particularly in the smaller diameters. All of the alloys have excellent corrosion resistance and are not affected by any single acid.
Resistivity, temperature coefficient and tensile strength graphs are available. Write for complete data.
Sigmund Cohn Corp.
121 S. Columbus Ave . Mount Vernon, N.Y. 10553 (914) 664-5300
INFORMATION RETRIEVAL NUMBER 64
122

TRW, Inc ., S emiconductor Div., 14520 Aviation Blvd., Lawndale, Calif. Phone: (213) 679-4561 . Price: $195, $147.
Two new broadband thin-film IC amplif iers mounted on aluminum heatsinks provide high gains to 500 l\IHz. The CA800 50-o unit has a 5-to-500-MHz bandwidth with 25dB gain. It uses a 28-V supply and achieves 400 mW of output power. The CA600 75-0 CATV unit has a 40-to-300-MHz bandwidth with 28dB gain.
CIRCLE NO. 266

University I nstruments Corp ., 5541 Central Ave., Boulder, Colo. Phone : (3 03 ) 443-4210. Price : from $6000.
Three high-speed optical communication links operate to 3 megabits / s and range up to 8 miles. All three have an error rate of less t h an 1 bit in 108 · Type OCL-300 operates synchronously from 20 to 50 kbits / s with an eight-mile range. OCL-310 works from 350 kbits /s to 3 megatbits /s from 1/ 2 to 1 mile. OCL-400 has an analog bandwidth from 60 Hz to 4.5 MHz (3-dB points) with an eight-mi le range.
CIRCLE NO. 268

ELECTRONIC DESIGN 25, December 6, 1970

"Whatyou hear about our ne~dry test bath is true.

The tape recorder is operating in a dry bath of Fluorinert® Brand Electronic Liquids. Just as your electronic and microelectronic units will.
Fluorinert Liquids give you an accurate method of temperature testing or testing for gross leaks. They keep their efficiency over a wide range of temperatures. They

do not react with even the most sensitive of materials. They won't deteriorate with use.
And you can ship or use parts directly out of the test bath without cleaning because Fluorinert Liquids evaporate, leaving no residue.
If you've been listening, you know that Fluorinert Electronic

Liquids are specified for MilStandard 883 and Mil-Standard 750A gross leak tests for microcircuits.
The coupon will bring you copies of both Mil-Standards and a lot of good solid information about test baths. Send it or call your local 3M man.

FluQ~iJ~ert® Electronic Liquids 3m

3M Company, Chemical Division , 3M Center St. Paul , Minn . 55101
Send me all the details about Fluorinert Brand Electronic Liquids.

KAP 12 -70

Company_ _ _ _ _ __ _Title'- - - -- - - - - - -- - - -
Address---- - - - - - - - - - - - - - - - - - - - -
City_ _ _ _ _ _ _ _ _ _ _ _ state _ _ __ _ _,Zip- - -- - -

INFORMATION RETRIEVAL NUMBER 65

EL ECTRONI C D ES IGN 25, December 6, 1970

123

MICROWAVES & LASERS
Hand-held rf detector spots 1-mW leaks

50/93- n video switches Thin-film hybrid unit

operate in 70 ns

is a tiny 50-0pulser

-R eeve Electronics, Inc., 609 W.
Lake St., Chicago, Ill. Phone: (3 12) 726-9755. P&A: $50 (less battery); 2 wks.
Minute levels of rf leakage from microwave equipment can now be quickly and easily detected through t he use of a portable han d-held inexpensive leakage detector. Sens itive to leakage levels of 1 mW or less per square centimeter, the LD2 is ideal for ensuring that leakage levels are within the limits of newly proposed Federal standards.
CIRCLE NO. 269

Analog R esearch, P.O. Box 22023, Dallas, T ex. Phone: (214) 5217056. P&A: $95; stock to 3 wks.
Designed for direct insertion in 50 or 93-n video lines, VS video switches with MOSFETs perform gating functions such as blanking or chopping in less t han 70 ns. Hi gh isolation of 70 dB is achieved while insertion loss is only 0.4 dB. Switchin g pedestals are only 10 mV maximum. A b uilt-in driver is compatible with all micrologic circuitry.
CIRCLE NO. 270

Systrnn Donner Corp., Datapulse Div., 10150 W. J efferson Blvd., Culver City, Calif. Phone : (2 13) 871-0401. P&A: $750; 90 days.
Designated the model 930 Pi coPulser, a new 50-n thin-film hybrid circuit permits point-of-test pulse switching from a tiny package. It it used in conjunction with the model 330 controller. Repetit ion rates are a single shot to 0.5 GHz, transit ion time is less than 500 ps
and upper level is - 1 to + 1 V.
Lower level is -3 to +0 .5 V.
CIRCLE NO. 271

Remex

CMMP Series

is coming out

of its sfiell. MINI

With a line of tape punches. See page 135.
,....xLa AUNIT or
~~e
EX-CELL-0 CORPORATION
INFORMATION RETRIEVAL NUMBER 66 124

adds the necessary dimension

to digital instruments

· 6 columns; 3 lines per second · Full BCD T' L interface built-in , for IC instrument compatibility. · Entire printer a plug-in · Size: 311 x 31/z" on panel · Price: Only $292.50* for full 6 columns

Send for catalog of the P.A. LINE of Printers, Counters and Digital Displays

·quantity 50

PRACTICAL AUTOMATION, INC.
Trap Falls Road, Shelton, Conn. 06484 · (203) 929-1495 · Telex 96-4217

INFORMATION RETRIEVAL NUMBER 67 INFORMATION RETRIEVAL NUMBER 68 ...

Electronic equipment is constantly running the risk of being "zapped" ... by lightning, short circuits, switching of inductive components, etc. These ceramic gas filled arresters, from Signalite, offer maximum protection against voltage surges. They are low priced (under $1.00) . . . reduce maintenance and down time ... withstand shock and vibration. Some of the more vital statistics are listed, but for complete details, contact Signalite.

Guaranteed 50 discharges ... 200 typical
Fast response ... 40 kvI nsec. wavefront
High temperature capability with true follow-on capability
Rugged ceramic construction . . . no glass
Low cost ... under $1

AVAILABLE UPON REQUEST
Detailed Data Sheet ... on Signalite Subminiature Low Voltage Ceramic Gas Filled Surge Arresters.

The Broadest Line of Spark Gaps In The World ... are described in the Signalite "300" Spark Gap brochure . .. including definition of terms, characteristics of gap operation and application information.

DIVISION OF GENERAL INSTRUMENT

1933 HECK AVE., NEPTUNE, N.J. 07753

(201) 775-2490

320

Another new Ledex thick-film circuit 100 watt voltage regulator

MICROWAVES & LASERS
Silicon p-i-n diodes switch rf in 5 ns
·

LMR-3 VOLTAGE REGULATOR now available from the shelf.

Typical Application and Connection Diagram

= Typical Specifications (TA 25°C)

Parameter

Typ.

Input voltage Output voltage Load current Line regulation
basic mode Load regulation
basic mode Power dissipation

8 to 50V 1 Amp
0.3%
0.5% 10 Watts

Max. 60V
2Amp
1.0%
1.0% 25 Watts

This thick-film voltage regulator consists of a series regulator and elements capable of regulating 8 to 50 volt DC power supplies, up to 100 watts. It will regulate your voltage supply to within less than 1% tolerance.
The LMR-3 is packaged in a low profile T0-3, .25011 maximum . It can also be used as a driver for higher current regulators.
Fast Custom Design We 're equipped to give you fast design and prototype service on any custom hybrid microelectronics package. Our engineers will come to you, if that's what you need.
You'll find our delivery dependable and our production standards among the highest in the industry.
The circuit described above is now stocked. Ask for catalog sheet. Or, for the whole story on our capability, write for brochure, "Custom Hybrid Microcircuits.''

Specialists in hybrid microelectronic circuits
. ~

LEDEX

'· - . '

LEDEX MICROELECTRONICS, LEDEX INC.
123 Webster Street, Dayton, Ohio 45401 phone ( 513) 222-6992

INFORMATION RETRIEVAL NUMBER 69
126

Aertech Industries, 825 Stewart Dr., Sunnyva.le, Calif. Phone: (408) 732-0880. P&A: $3.50 to $22; stock to 3 wks.
Silicon p-i-n diodes with 5-ns switching times and 300-W power dissipation are available. Series A5Sll0 diodes switch rf in 5 ns. Series A4Sll5 diodes have 5-ns risetimes, 1-n resistance and 70-V breakdown. The A5S100 diodes can handle 300 W of power and switch in 100 ns. Series A5S106 units provide 0.32 pF, 200-V breakdown and 1.5-n resistance.
CIRCLE NO. 272
28-V power transistors operate to 1 GHz
Kertron, Inc., 7516 Central Industrial Dr., Riviera Beach, Fla. Phone: (305) 848-9606. P&A: $13, $26; 2 wks.
The 3TX850 and 3TX851 transistors are for FM and cw requirements at 28-V operation up to 1 GHz. They are specified with 5.2 dB of power gain at 1 and 2.5 W, respectively, and have infinite VSWR. Both are packaged in a 1/ 4-in. ceramic stripline case with all leads isolated from the case. They are also available in 1/ 4-in. molded stripline cases.
CIRCLE NO. 273
ELECTRONIC DESIGN 25, December 6, 1970

What we won't do is make up a special and
.. a production CG. That's not telling it like
1'encl for our capacitor-application informa to find out how we can help you ... best.
of course, are available from your Mallory

MALLORY
Electrical and electronic componenta ·

INFORMATION RETRIEVAL NUMBER 7 0

l".LLCTRONIC D1::s1G 25 , Decembe r 6, 1970

127

MICROWAVES & LASERS
Wideband amplifier covers 1 to 100 MHz

IR GaAs emitters cost from $2.18

Two element photocells are independent pairs

Arvee Engineering Co., Inc., P.O. Box 3759, Torrance, Calif. Phone: (213) 373-1324. P&A: $150 ; 1 wk.
The model 610 wideband amplifier covers the frequency range of 1 to 100 MHz. It has 20-dB gain and less than 15 µ, V of equ ivalent input noise. The amplifier can drive a 1-V pk-pk signal into a 50-n load with less than 1 dB of gain compression. It employs subminiature coaxial connectors on a machined-aluminum housing measuring 1.75 by 1 by 0.6 in . Input impedance is 50 n.
CIRCLE NO. 274

Texas In struments, Inc. , 13500 N. Central Expressway, Dallas, Tex. Phone: (214) 238-2011. P&A: $2.18, $16.50; stock.
Two new low-cost GaAs IR emitters, TIXL26 and TIXL27, are priced at $2. 18 and $16.50 respectively. TIXL26 features 1-mW power output when biased at 35 mA. The TIXL27 features power output of 15 mW when biased at 300 mA. TIXL26 is encased in a glass-tometal-seal header with an epoxy dome-shaped lens. TIXL27 is encapsulated in a T0-5 stud header.
CIRCLE NO. 275

Raytheon Co ., Industrial Components Operation, 465 Centre St., Quincy, Mass. Phone: (617) 4795300. P&A: 90¢; stnck to 4 wks.
A family of 10 new dual-element photocells contains two completely independent and isolated photosensitive elements on a common ceramic substrate. The units offer a range of applications where two or more photocells are used si multaneously in phase. Resistance balance is 90 % and tracking error is 10 % at irradiance levels of 100 to 10,000 µ,W /c m2 ·
CIRCLE NO . 276

Remex is coming out of its stiell.
With a magnetic tape cassette series.
See page 133.
,.....xLa A UNIT or
~~ -
EX-CELL-0 CORPORATION INFORMATION RETRIEVAL NUMBER 71
128

HOW CAN THIS LITTLE GIRL SAVE YOU MONEY?
WE'RE GLAD
YOU ASKED.
Mona Devost is only 19. But she 's smart, hardworking, intelligent and accurate...with extremely nimble fingers. Mona operates our 6-station 24 spindle turret coil winder -a machine capable of turning out 5000 completely wound coils every 8 hours.
In this case, we 're producing 4 coils every 0 .74 minutes, each with 5000 turns of No. 38 coated single polyurethane copper wire.
Accuracy is ± 2 turns. Of the more than
250,000 coils produced in this run , there has not been a single reject!
With a capability like this , we can afford to pass the cost-saving along to our customers.
Delivery? We 've been knowr. to supply 10,000 coils in 2 days with only 24 hours lead time ... assuming we have your bobbin size in stock.
Why not let us quote on your coil specifications. Call us at (203) 747-1213.
ELECTRONIC COIL CORPORATION
329 NEW BRITAIN AVENUE PLAINVILLE, CONN . 06062
INFORMATION RETRIEVAL NUMBER 72
ELECTRONIC D ES IGN 25, December 6. 1970

enc a

· It has been computed that " debugged" DM30, 10,000 MMF units , when subjected to 257,000 hours of life at 85 ° C with 100% of the rated DC voltage applied, will yield only 1 FAILURE PER 43,000,000 UNIT-HOURS!
· DM15, DM16, DM19, DM20 ... perfect for miniaturization and for new designs using grinted wiring circuits. Also available in DM30, DM42 and M43.
· New "hairpin" parallel leads insure easy application. Exceed all electrical requirements of military specification MIL-C-5A.
· Available in 350 voe and 500 voe as well as other test
voltages. · All bases are of low-loss steatite. · Spec ial lugs are obtai nable for printed circuitry. · Miniature units are available. · Solder Lugs can be bent in any position without affecting
the capacity setting due to the rigid construction. · Va rious types of mounting bracket s are ava ilable for all
trimmers. Units can be construct ed for special appl ications.
Only 1 Failure in 14,336,000 Unit-Hours!
e Life tests at 105°C w ith r ated voltage applied have yielded only 1 FAILURE PER 1,433,600 UNIT-HOURS for l MFD. Since the number of unit-hours for these capacitors Is Inversely proper· tional to the capacitance, 0.1 MFD Mylar-Paper Dipped capacitors will yield only l FAILURE PER 14,336,000 UNIT-HOURS I · Working volts DC : 200, 400, 600. 1000 and 1600. · Durez phenolic resin impregnated.
· Tolerances : ± 10% and ± 20% (closer tolerances available) .
· Dielectric strength : 2 or 2112 times rated voltage, depend ing upon
e working voltage. Exceed all electrical requirements of E .l.A. specification RS-164 and military specifications MIL-C-91A and MIL-C-2SA.

·t 1H000!13

, El·ffienco ,.

· Unmatched for excellent stability, dielectric strength, high insulation resistance, extremely high "Q" and correspond· ingly low power factor.
· Units can be subjected to a short "debugging" life test at elevated voltage and temperature for removal of early life failures and for improved reliability.
Write for Free Sannples and Booklets on An11 of The Above Capacitors
EL-MENCO OFFERS A COMPLETE LINE OF CAPACITORS · ·· STANDS READY TO SERVE ALL YOUR CAPACITOR NEEDS
THE ELECTRO MOTIVE MFG. CO., INC.
WILLIMANTIC, CONNECTICUT 06226
Dipped Mica · Molded Mica · Silvered Mica Films · Mica Trimmers & Padders Mylar-Paper Dipped · Paper Dipped · Mylar Dipped · Tubular Paper

West Coast Manufacturers contact: COLLINS& HYDE CO. , 900 N. Sa n An to nio Rd ., LosAl to s, Ca l ifornia 94022 5380 Wh i tti er Blvd ., Los An ge les. Califo rn ia 90022
ALSO SOLD NATIONALLY THROUGH ELECTRONIC PARTS DISTRIBUTORS

INFORMATION RETRIEVAL NUMBER 73

EL ECTRON IC D ESIGN 25, December 6, 1970

129

MICROWAVES & LASERS
Exactly· Differential amplifier claims 1-GHz bandwidth your / speed.

Servo-Tek's Speed Indicating System takes the precise rotational speed of your application and displays it on an easy-toread meter. And it tells you repeatedly and accurately even on the most delicate machinery. A temperature-compensated low torque d-c generator and a taut-band meter movement assure a maximum error of less than 1% of full scale reading. Use it as a watchdog on any industrial application where sensitive speed indication is necessary. The attractive design of our Model ST-926 modernizes any application and comes in a standard version or tailor-made with bi-directional indication, special scales and ranges, and with color coding for multiple readouts.
SERVO-TEK PRODUCTS COMPANY 1086 Goffle Road, Hawthorne, New Jersey 07506.
SERllO-TEK
PRODUCTS COMPANY

!TL R esem·ch Corp., 8955 Quartz Ave., Northridg e, Calif. Phone: ( 213) 882-3500. P&A: $495; 30 days.
Featuring a common-mode rejection ratio of more than 60 dB, the model 19 differential amplifier achieves a wide bandwidth of 1 GHz. It is offered in three configurations: as a 14-pin DIP, as a molded module and as a coaxial component. Rise time is up to 1 ns, propagation delay is 5 ns and input pulse widths range over 10 ns to 10 µs. Maximum duty cycle is 0.1.
CIRCLE NO. 277
Avalanche silicon diode pulses at S band

For complete specifications write for our colorful technical sheets.

Injection laser diodes increase output power
Texas Instruments, Inc., 13500 N. Central Expressway, Dallas, T ex. Phone : (214 ) 238-2011. P&A: $37.50, $12.50, $50; stock.
Three new injection laser diodes, TIXL28, TIXL29 and TIXL30, are for applications using pulsed light with high peak-power outputs. The TIXL28 is a three-layer diode with a threshold current to 15,000 A/ cm2 at 25 °C. The economical TIXL29 is 4 by 10 mils in size and requires a threshold current of 25 to 40 A ai 25 °C. It features peak power of 4 W and lases at 50,000 A/ cm2 · The TIXL30 is 15 by 15 mils in size and achieves power outputs of 10 to 15 W.
CIRCLE NO. 279
Photon detectors span uv to IR bands
Opto electronics, Inc., 1309 Dyncimic St., P etaluma, Calif. Phone : ( 707 ) 763-4181. Availability: stock.
The new KN-15 series of broad band quantum-measuring devices detect from the ultraviolet to the infrared spectrums. They provide high sensitivity throughout the spectral range from 2000 A. to 3 microns with a time constant of 500 µs. Peak detectivity is typically 1011 cm-Hz 1! 2 / W with a respon-
sivity of 4 to 7 x 105 V/ W. Cell
resistance is 0.5 to 1 Mn/ square. Standard sizes are 1 by 1 or 2 by 2 mm.
CIRCLE NO. 280

'" ·''''''\i> I I 150 200, ~5~ .~°'.1 350

100 5o ' '\ '

I / " , 400 450

/ '/

INFORMATION RETRIEVAL NUMBER 74
130

Gen eral Electric Tube Dept., 316 E. 9th St., Owensboro, Ky. Phone: ( 502 ) 683-2401.
The Y-2075 is an avalanche silicon mesa diode structure bonded to a copper heat sink for high-efficiency pulsed service at S band. It produces 20 to 40 W of pulsed output power at 3.7 GHz and has a 20 % efficiency for 1-µs pulses at a 10-kHz pulsing rate. It is available with the C-2076 S-band test circuit for testing and evaluating.
CIRCLE NO. 278

Small step attenuators cover de to 12.4 GHz
Solitron/Microwave, Filmohm Div., 37-11 47th Ave., Long Island City, N. Y. Phone: (212) 937-0400. P&A: $205 to $270; 8 wks.
A new series of 1/ 2-W attenuators covers the range of de to 12.4 GHz. Series TA1050 units measure 3/ 8-in. long and 1-1 / 2-in. in dia. One model, the TA1050-9B, is a O-to-9-dB dc-to-8-GHz unit with 1-dB steps. Its maximum attenuation error is 1/ 2, its VSWR ranges over 1.2 to 1.4 and its insertion loss spans 0.2 to 0.5 dB.
CIRCLE NO. 281

ELECTRONIC DESIGN 25 , December 6, 1970

RCA today introduces to designers a great idea in three new devices -

the discrete TA7486 and TA8104, and the 4-stage MIC broadband ampli-

fier, TA7701. Useful in the 400 MHz to 2 GHz frequency range, these

units offer improved low-noise performance at low cost.

+ TA7486 is a miniature hermetic stripline-package transistor intended for use as a low-noise amplifier for receiver front ends. At 1 GHz, it has a 3 dB maximum noise figure and a power gain of 10 dB.

A similar unit, TA8104, is available in the T0-72 package.

TA7701, a thin-film hybrid integrated circuit, utilizes four lownoise n-p-n transistors similar to the TA7486 and TA8104 , in a direct-coupled circuit. This device operates over the bandwidth

of 50-700 MHz at a noise figure of 5 dB max. and a gain of 30 dB at 500

MHz . TA7701 comes in a low-profile T0-12 package.

ncn

For more information, including prices and delivery, see your local RCA Representative or your RCA Distributor. For technical data, write : RCA, Commercial Engineering, Section 57 L-6/UF9, Harrison , N. J. 07029. International : RCA, 2-4 rue du Lievre, 1227 Geneva, Switzerland, or P.O. Box 112, Hong Kong.

INFORMATION RETRIEVAL NUMBER 75

ELECTRON IC D ESI GN 25 , D ecem be r 6, 197 0

131

COMPONENTS
Low-profile switch is a 14-pin DIP

Low-voltage readout shows 6k foot-lamberts

Tiny surge protectors operate at 2000 V

Daven Div. of Thomas A. Edison JndusfriPs, Grenier Field, Manchester, N. H. Phone: (6 03 ) 6690940.
The Dipswitch is a low-profile ( 0.23 in. ) 14-pin dual-in-line switch that is 100 % IC compatible. It offers a piggy-back feature that allows any standard 14-pin device to be plugged directly into it. By means of a screwdriver slot, 6 positions can be selected, each position corresponding to a respective circuit.
CIRCLE NO. 282

Apollo Corp. Int ernational Div., 5-1, Togashi 6-Chome, ShanagawaKu, Tokyo, Japan. Availability: 60 days.
Utilizing a seven-segment display, type DA133 incandescent readout tube which operates on only 3.5 to 5 V projects adjustable brightness levels up to 6000 footlamberts. It is compatible with IC decoder/ drivers and indicates alphabetical characters A, C, E, F, H, J, L, P and U . Readout is in a single plane at a viewing angle of 140 degrees.
CIRCLE NO. 283

Sie'Yliens Co1·p., 186 Wood Ave. S., lselin, N. J. Phone: (201) 4941000. P&A: $1; stock.
Two new miniature gas-filled surge-voltage protectors, type B2H10 (0.28-in long) and B2-H25 ( 0.44-in lon g), provide protection with peak operating voltages up to 850 and 2000 V, respectively. The former has a de striking voltage of 1 kV ± 15 % , and the latter has a de striking voltage of 2.5 kV ± 15 % . Both have insulation resist-
ance greater than 1010 n.
CIRCLE NO. 284

We sell more than amplifiers

Sure ... we can provide you with our DC servo power amplifiers ranging from 25 to 1,500 watts output. But complete system design is our forte. Working with our sister divisions that manufacture motors and tachs, we can coordinate the design of your system
from command signal to primary driver and eliminate interface problems.
Fin control on missiles is just one exam· pie. Give us a call and let us show you how we debug your application before the bugs get in. H:~:LLalo~a:Ef:N

Inland Controls, Inc. 250 Alpha Drive, Pittsburgh , Pa. 15238 Tel: 412·782-3516 TWX 710·664-2082

INFORMATION RETRIEVAL NUMBER 76

132

ELECTRONIC DESIGN 25 , December 6, 1970

Remex is coming out of its shell.
With an economy otoelectric punch tape reader. With a line of tape punches. A magnetic tape cassette series. And this is just the beginning. All the quality that made ours the Grade A name in punch tape reader products--now in a whole , line of peripheral equipment.

/(£M£X5250 W. El Segundo Blvd ., Hawthorne,California 90250

""xLa A UNIT OF
~~®
EX·CELL·O CORPORATION

INFORMATION RETRIEVAL NUMBER 77

EL ECTRO IC D ESIGN 25, D ece mbe r 6, 197 0

133

Take a closer look at the results of high "91tage cable experience!

BIWhas 30 years of it.

Years of solid, down-to-earth experience have been essential ingredients in the development of BIW high voltage cable features . Our standard silicone rubber cable is a good example. A life versus voltage test series data sheet reflects the superior performance record of these cables. Voltage overload (60 cycle A-C) of 125% with cable life of at least 10,000 hours. A data sheet is yours for the asking. BIW offers eight basic voltage cables with voltage flexibility from 10to100 KV D-C in the above category.

Another interesting example is our exclusive process for our TFE cable . Thin TFE tapes are combined with high dielectric strength oil and an FEP jacket to produce extremely tough and reliable high voltage cable that is exceptionally small in diameter. Temperature range for TFE cable : - 80° to 200°c .

Among our recent additions : UL-approved CRT anode lead silicone rubber assemblies with molded plugs for data processing read-out equipment. With them , you get all the advantages of our standard silicone ruqber, high voltage cable. These new BIW assemblies are operable to 70,000 ft. altitude, are highly corona resistant and are rated to 30 KV D-C continuous working voltage.

CRT Anode Lead Silicone Rubber Assemblies

Send for data sheets on CRT anode lead assemblies and other BIW high voltage products. Check BIW engineering experience in developing high voltage cable for difficult
environments. No reason why you , too, shouldn 't profit by experience.

Boston Insulated Wire & Cable Company
65 Bay Street, Boston , Mass. 02025 ·Tel: 617-265- 2104 El Segundo , California 90245 ; Hamilton , Canada ;
Kingston -upon-Thames. U.K. ; GEDEBIW. S.A.- Clichy, France
INFORMATION RETRIEVAL NUMBER 78
134

COMPONENTS
Tiny-30-in.3 delay line has 100:1 delay-to-rise
ESC E lectronics, 534 B ergen Blvd., Palisades Park, N . J. Phone: (201) 947 -0 40 0 .
The model 47-41 electr om agneti c delay line feal ures a hi gh 100: 1 delay-to-r i se ti me rati o i n a package m easu r i ng onl y 30 cub i c in. The delay l ine i s extr emely stable w i t h a temper ature coeffici en t char acter istic of 25 ppm /°C. It also provides a choice of del ay taps, each spaced every 1.28 µ s in del ay apart. The total del ay t ime of t he 47-71
is 15.36 µ s. Its impedance i s 250 n and i t has a max imum attenua-
tion of 10 dB.
CIRCLE NO. 285
Tiny chip resistors
span 0.1 to 1 M 0 range
Afrco Speer E lectronic Components, Div. of Air R Pduction Co., Inc., Niagara F alls, N. Y. Phone : (716) 285-9381.
New chip resistors t hat feat ure 85-by-55-mil si zes span t he resist-
ance range of 100 n to 100 l\Iin .
The new chips have t hi ck-fi lm elements and. palladi um-gold terminations. Gol d is al so appl ied to t he undersi de of each el ement. Their temperature coeffi ci en t of res i stance i s less t h an 200 ppm /° C and
t heir tolerances are ± 5 an d ± 10 % .
The new ch ip r esi stors are available i n ki ts .
CIRCLE NO . 286
Small synchro bridge costs only $100
T heta Instrument Corp ., F airfield, N. J . P hone : (201 ) 227-1700. P&A: $100; stock.
l\Iodel SB-M-11 i s a t hree-arm encapsul ated synch ro bri dge devi ce measuring 0.44 by 0.5 by 1.75 in . and costing only $100. It accepts Sl, S2 and S3 synchro outputs and converts t hem to a t wo-wire analog voltage repr esent ing synchro position. It m ounts easil y onto a pri nted ci r cuit board. Its speci f ications include an accuracy of 20 seconds of ar c.
CIRCLE NO . 287
ELECTRONIC D ESIGN 25, D ece m ber 6, 1970

In the beginning: The Remex Punch Tape Reader/Spoolers.
Fast. Fast. Fast.

Maybe you've heard that Remex is breaking out of its shell. And breaking into new areas of peripheral data processing.
But we're not forgetting where we started.
Remex rules the roost with our reliable 3000/4001 series of punched tape reader/ spoolers. We dominate the field because our units are the best around. Accurate, adaptable, and fast.
Fiber optics is one of our most famous features. This Remex patented innovation prevents signal confusion and assures you super sensing of data.

The system collimates light so that punched tapes of up to 70% transparency can be read. It's the most perceptive, most sensitive, and most reliable optical system available. Period.
We back it up with a selfcleaning, vibration-proof quartz iodine lamp. Another Remex innovation. These lamps give you 15,000hoursof even illumination -and that's a conservative estimate.
With integrated circuits, interfacing is easy.
The spooler smoothly handles a greater-than-normal tape capacity with better-than -

normal accuracy. And the unit's compact.
Speed may be ·the biggest plus of all. Remex has all you need for punched tape operation. Up to 1,000 characters per second.
And we have off-the-shelf delivery.
So that even though our reader/spoolers have been around for a long time, you can stillgetthemfresh. Here's where. 5250 W. El Segundo Blvd ., Hawthorne, California 90250.
In Europe and the U.K., contact S. p. A. Microtecnica, Torino, Italy.

/(EMEX
IS COMING OUT FITS SHELL.

A UNIT OF
,-XLO~
~~®
EX·CELL·O CORPORATION

INFORMATION RETRIEVAL NUMBER 79

ELcCTRO 1c DESIG 25 , December 6, 1970

135

COMPONENTS

Teflon chip capacitors reduce dielectric loss

Silicon resistors drift +7000 ppm/°C

Transient suppressors work within 50 ns

Polyflon Corp., 35 River St., New Rochelle, N . Y. Phone: (914) 636-
7222. New chip capacitors made of
electroplated copper on pure Teflon substrates provide low-loss dielectrics and can be soldered with ease into circuits. Chips are made of 0.02 to 0.125-in.-thick Teflon and vary in capacitance from 0.5 to 5 pF. Units employing thin subst'l.·ates can have t heir capacitances precisely determined by trimming t he geometry of t he Tefl on.
CIRCLE NO. 288

.
Angstrohm Precision, Inc., sub. of Riker-Maxon Corp., 7811 Lemona Ave., Van Nuys; Calif. Phone: (213) 989-3064. Availability: stock.
A new line of silicon resistors caled P lus-R features a large tem-
perature coefficient of +7000
ppm /° C. The line includes 1/ 8 and 1/ 4-W sizes, both encapsulated and in chip form. They meet requirements of MIL-T-23648A and have
resistance values from 10 n to 10
Kn wit h tolerances of ±5 % and ±10 %.
CIRCLE NO. 289

MCG Electronics, 279 Skidmore Rd., Deer Park, N. Y. P hone: (516) 586-5125. P&A : $10; 3 wks.
The LVC-lZ line of miniature transient suppressors switch from an open-circuit to a clamping state within 50 ns whenever the clamping threshold is exceeded. T hey can handle 5 kW for 500 µs. In standby mode, leakage current is only a few microamperes. Units are available
with trip voltages °from 5 to 600 v
and power capab ilities from 100 to 5000 W.
CIRCLE NO. 290

JANCO OFFERS A "TOTAL APPROACH" TO YOUR SWITCHING PROBLEM!
Standard rotary selector switches, miniature, micro-miniature, power, push -button , solenoid operated, keylock, momentary, etc... . Janco has the total line for your every need! You ' ll find this same "total approach " in Janco's qual ity of design and materials. And if Janco's basic switches do not completely fill your needs ... Janco engineers will design one!
JANCO CORPORATION
3111 Winona Ave ., Burbank, California 91504 Phone 213-845-7473 ·TWX 910·498·2701
INFORMATION RETRIEVAL NUMBER 80
136

INFORMATION RETRIEVAL NUMBER 81
ELECTRONIC D ESIGN 25, December 6, 1970

SOLID-LITE

SOLID STATE LAMPS AND
NUMERIC INDICATORS
New Solid-Lite semiconductor display devices use gallium phosphide, the most efficient of all visible-light electroluminescent materials. You get bright light at lower current.

SOLID-LITE Solid State Lamps Provide an area source of light-not just a pinpoint. These IC-compatible light-emitting diodes produce a lumi-
nous intensity of 2 millicandelas at 15 mA and 2.1 volts with easy wide-angle viewing . They offer:
· Low power consumption
· Excellent shock and vibration resistance
· High reliability-long life
· Low cost

SOLID-LITE Solid State Numeric Indicators

Actual Size

Low-cost, seven-segment numeric indicators in standard 14-pin dual inline packages are compatible with TTL and DTL IC's. Large, bright numerals are pleasing to the eye. They offer:
· Low voltage operation at less than 1;4 watt tota I power
· Large character size- .33 " x .21 "
· Single-plane wide-angle viewing
· High reliability-long life
· Excellent shock and vibration resistance
For technical literature ·or applications assistance, write or call OPCOA, Inc., 330 Talmadge Road , Edison, New Jersey 08817 ; phone (201) 287-0355.

O P C O A INC.

INFORMATION RETRIEVAL NUMBER 82

ELECTRONIC D ESIGN 25, D ecember 6, 1970

137

IN A/DANDD/A
CONVERTERS
WHAT SETS ANA LOGIC APART?
SPECS.
More spec if ications than most other compan ies.Tighter spec ificat ions than most other compan ies. Specifications that are met on a con t inuing basis. A nalogic's spec ifications are conservatively stated, never overstat ed, and are designed into the product not the result of test "fall ins" .

MODULES & SUBASSEMBLIES
Dual tracking regulator powers 25 op amps

Instrument amplifier gains up to 1000

Silicon General, Inc., 7382 Bolsa Ave., W estminster, Calif. Phone: (714) 839-6200. P&A: $4.80 to $9.80; stock.
A single SG1501 monolithic dual-polarity tracking regulator will power 25 operational amplifiers and take the place of 2 regu lators and 8 external components. Simultaneous positive and negative outputs are provided which are factory set at ± 15 V or are variable from ± 8 to ± 23 V with a s.i ngle external adjustment. Outputs are balanced to withi n 1% .
CIRCLE NO. 291

Z eltex Inc., 1000 Chalomar Rd., Concord, Calif. Phone : (415 ) 6866660. P&A: $52; stock.
A new 14-pin DIP instru mentation amplifier, model ZA701Dl, features a gain r ange of 1 to 1000. Only one resistor is needed for ga in selection. Gain linearity is ±0.03 % and common-mode r ejection is 110 dB. The hybr id amplifier is constructed of monolithic chips and uses thick-film deposited resistors wh ich are trimmed to 0. 1 % and have excellen t temperature-tracking characteristics.
CIRCLE NO . 293

LOW COST, HIGH PERFORMANCE
A/D CONVERTER
Analogic' s low-cost.high-performance AN 2800 series is a recent addition to what we believe to be t he industry 's most complete line of A / D and D/A converters.
·Available in 8,10, or 12 binary bits and 2 or 3 BCD digit configurations ·DTL/T2L compatible·Accuracy to 0.01%·Speeds to 1' µ sec/bit ·Tem perature coefficients are : 9ppm/°C (gain) ; 0.0015% F.SJOC (offset) ; and 2ppm/OC (differential interbit quantizing)·Adjustable word lengths · Unipolar and bipolar input ranges ·All standard output codes (including NRZ serial) Contained on an easil y repairab le single 2-13/ 16" x 4-5/ 8 " p lug-i n card , the AN 2800 has accessibl e bu i lt-i n clock rate , offset and range adjustments. Cost of the AN 2800 is $2 75 to $ 345, with substanti al OEM discoun t s depending upon output resolution.
The most knowledgeable and available A / D and A / D appl ication eng ineers in the indu stry are read y to assist you. For im mediate informa t ion call Paul LaBrie, (617 ) 246-0300 o r w ri te for definitive data sheets and our comprehensive short fo rm cat alog. Analog ic Corporation.Audubon Road, Wakefield, Massachuset ts 01880.
ANALDGIC· ® .. .The Digitizers
INFORMATION RETRIEVAL NUMBER 83
138

1000-V/µs op amps
settle to 1% in 200 ns

Seven-segment readout mates edge connectors

Burr-Brown R esearch Corp ., Interncitional Airport Industrial Pci1·k, Tuc son, Ariz. Phone: (602) 2941431. P&A: $69, $59; stock.
The 3341-2/15C operational amplifiers have slew rates of 1000 VIµ,s and settle to 1 % of final value in 200 ns. Bandwidth is 50 MHz, output rating is ± 10 V at ± 100 mA and ± 5 V up to 20 lVIHz when driving a 50-n line. Bias current is 100 pA and voltage .drift is ±25 µ, V/°C ( ±50 µ,V /°C for model 3342/15C).
CIRCLE NO. 292

Pinlites Inc., 1275 Bloomfield Ave., Fairfield, N . J . Phone : (201) 226-
7724 . The Lite-Pak is a 7-segment
digital readout that plugs directly into a standard 0.05-in.-center edge connector. It operates on only 3 to 5 V at 8 mA. It is readable in direct sun ligh t and includes a 120deg ree viewing angle. A wide selection of colol"s is avai lable either by using colored glass or by using fi lters.
CIRCLE NO . 294

ELECTRONIC DESIGN 25, D ecember 6, I 970

Model 630-A Laboratory V-0-M 1. ±ll/2% DC, ±3% accuracy. 2. One selector switch minimizes chance of incorrect settings and burnouts. 3. Rugged 51/2" suspension meter movement with 41/2" mirrored scale. $75 suggested USA user net price

Model 630-APL Laboratory V-0-M
1. ±1112% DC, ±3% accuracy. 2. One selector switch minimizes chance of incorrect settings and burnouts. Polarity reversing for DC. 3. Suspension meter movement diode protected against instantaneous overloads. $75 suggested USA user net price

General Purpose V-0-M
Model 630-PL 1. One selector switch minimizes chance of incorrect settings and burnouts. Polarity reversing for DC. 2. 4.4 Ohms center scale, 0 .1 ohm to 100 megohms resistance. 3. Meter movement diode protected against instantaneous overloads. $64 suggested USA
user net price

General Purpose V-0-M
Model 630 1. One selector switch minimizes chance of incorrect settings and burnouts. 2. 4.4 Ohm ::enter scale, reads from 0.1 ohm up to 100 megohms resistance in 4 ranges. 3. 20,000 ohms per volt DC sen-
sitivity; 5,000 AC . $64 suggested USA user net price

Laboratory or General Purpose Triplett meets the need
precisely

Products of Triplett's long experience in the design and manufacture of highquality, high-performance V-0-Ms, these representatives of the great Model 630 series offer the most-wanted features combined as perfectly as the skills of dedicated craftsmen can guarantee.
See your Triplett representative or distributor for a free demonstration of any or all of these versatile instruments.

TRIPLETT
CORPORATION
MANUFACTURERS OF THE WORLD'S MOST COMPLETE LINE OF V-0-Ms

INFORMATION RETRIEVAL NUMBER 84

ELECTRONIC D ES IGN 25, D ecember 6, 1970

139

MODULES & SUBASS EMBLIES
Thick-film ladder matches to 25 ppm/°C

100-MHz op amp
slews 100 V/µs min.

DIP decoder/drivers work 7-segment displays

MicJ'Otek, a unit of Components, Inc., Smith St., Biddeford, Me. Phone : (207) 282-5111.
The LN128 is a high-performance thick-film 10-bit binary ladder network with resistor temperature coefficients of 25 ppm/° C over the temperature range of - 55 to
+ 125 °C. Tracking between re-
sistors is 2.5 ppm /°C and output
vo ltage settling time to 0.1 % is
100 ns. Resistance values to 50 k.n are also availa ble in 0. 1-in.-high packages.
CIRCLE NO . 295

Optical Elect1'0nics, Inc., P. 0. Box 11140, Tucson, Ariz. Phone: (602) 624-8358. P&A: $82; stock.
Packaged in a 1-in.-square by 0.31-in.-high module, the 9697 operational amplifier provides a
± 100-VI µ,s minimum slewing rate,
100- !Hz minimum gain-bandwidth product and 500-ns settling time to 0.1 %. Other features include a ± 50-V common-mode voltage range and ± 10 to ± 75-V output supply voltage range.
CIRCLE NO. 296

.4lco Electronic Products, Inc., P .O. Box 1348, Lawrence, Mass. Phone.: ( 617) 686-3887. Availability : stock.
The MSDD-320 series integrated hybrid decoder/ drivers in 16 and 20-pin DIP configurations contains BCD-to-7-segment and count-to- 1segment units with or without quad latch memory. Current sinking per segment is 120 mA for incandescent disp lays. For cold-cathode displays, the MSDD-720 series features 200-V outputs. Inputs are TTL/ DTL compatible.
CIRCLE NO. 297

DELIVERY FROM

P.C.CARD

STOCK

HANDLES

CASES CONNECTORS

CARD FRAMES MODULE RACKS
VEAOBOARD' CARD HANDLES
FRONT PANELS PANEL HANDLES

Molded of polycarbonate, these smartly styled handles mount withput hardware in two styles, while the third may be riveted. The snap- in versions have molded lugs that snap into holes in the P.C. card and lock in place. Th is unique fixture saves time, labor and hardware costs wh ile providing a positive attachment of handle to card , available from stock in black, white , red , green and blue.

VERO ELECTRONICS INC. rwx510-221-ssso
171 BRIDGE ROAD, HAUPPAUGE, N. Y. 11787 TEL: 516-234-0400

IN FORMATION RETRIEVAL NUMB ER 85

140

ELl:CTRONIC DLSIGN 25 , December 6. 1970

H£r1-.P-----r-J,elfl

I I
I
H.t.L.P.:
Anew way of not paying fa< the
equiement you need!

Yes I I would like additional information on the following:
D Leasing D Renting D Off-the-shelf Delivery

NAM

POSITION_ __

FIRM_ _ _ _ _ _ _ _ _ _ __ __

ADDRESS_ __ __ __ _ _ _= :--CITY_ _ _ __ _ _ __

1
H.ll..P.:
Off- the-1h~f,
17-day delivery
help! .!helve your
time problem.A

H.E.L.P. is Honeywell's Equipment Leasing Plan. A new way we can help you help yourself.
With H.E.L.P., you can lease the Honeywell instrumentation you would ordinarily have to buy. But, without \Jf,J: a large capital investment. Which means you can have state-ofthe-art equipment now. When you need it. And pay for its use while you use it. Not before.
H.E.L.P. enables you to lease new equipment that's covered by standard warranties. As part of your lease plan, you may include an option to buy the leased equipment. It's up to you. Each lease plan is tailored to your particular needs.
H.E.L.P. is new. But, helping you isn't. We feel that's one of the big reasons we've grown large enough to offer an exciting, new program like H.E.L.P.

-
H.t.L.P.:
Jhort-term rental aqreement1 to meet Jhort-term need1!
If your instrumentation requirements are short-term, you may rent the equipment. Instead of leasing it. This way, if you need instrumentation for two weeks, you can rent it for two weeks. Or however long you need it.
And, of course, all rental agreements include service. Honeywell's nationwide staff of service special ists, using the latest test equipment and measuring standards, stand ready to serve you .
For many, renting equipment can also mean increased tax benefits.The exact amount, of course, will depend on the individual situation. And by renting, as with leasing, you don't tie up your capital. Or your time.
Renting .. . just another way we can be of H.E.L.P.

Many times, you need instrumentation fast. So, we get it to you fast. Within days. Instead
of weeks. In fact, we can promise 17-day delivery on . . all transducers, signal con- .......- ditioning equipment, X-Y recorders and digital products. Help yourself to any of our services. They're all designed to help you. Because helping you helps us. For additional information, simply fill out and mail the attached coupon to Honeywell, Test Instruments Division, P.O. Box 5227, Denver, Colorado 80217. Attention : M .S. 218
Wlh qlirrleHELP
rrom ~our rriendf or
Honeywell

HONEYWELL INTERNATIONAL Sales a nd Service offices in all principa l cit ies. Manufacturing in Aust rali a, Ca nad a, Fin la nd, France, Ge rmany, Japan , Mexico, Neth e rl ands, Spa in, Taiwan, U.K. a nd U.S.A.

EL ECT RONIC D ESIGN 25 , D ece mber 6, 1970

141

Project:
electronic tuning.

MODULES & SUBASSEMBLIES
7-1/2-in.3 supplies sock out 50 watts

Solution:

Powercube Corp., 214 Calvary St., Waltham, Mass. Phone: (617) 9241758. Availability: stock.
Cube-Pac power supplies provide up to 50 W and 100 V of output power and voltage, all packed in 7-1 / 2-in.3 rfi / emi shielded enclosures. Their modular design allows flexibility of multiple-output combinations. Features include line and load regulation, input-output isolation, current limiting and high efficiency. Units meet MIL-S-19500 requirements.

CIRCLE NO. 298

If you're doing electronic tuning, you should be talking to us. We'll tell you about KEVICAPS, our superior line of tuning diodes. We manufacture abrupt and hyperabrupt diodes, or custom make them to your specs. Anyway you want them, KEVICAPs have superb signal-handling capabilities. And they' re hermetically sealed.

Low-drift oscillator
stabilizes to 2 x 10-1

Our hyperabrupt diodes have a large capacitance swing. Superior tracking. Our ion implantation process allows endless reproducibility - no more matched sets. So no matter when you order, or what volume you order, you get the same product.

We have broad capabilities: abrupt junction; hyperabrupt; VVC's for HF, VHF or UHF tuning; VHF bandswitching diodes. Whatever your application: military, industrial, avionics, AM or FM broadcast, VHF or UHF TV, VCXO, TCXO or frequency synthesis. Behind our product is our staff. They're your staff, too, anytime you need aid in systems design. And our prices are low. We're here. We're better. We're competitive. Write or call us for specs. Today.
K EV ELECTRONICS CORP.
WILMINGTON INDUSTRIAL PARK WILMINGTON, MASS. 01887 PHONE !617l 658-6970
"Pioneers In Ion lmpfantsfion"

Bulova Watch Co., Inc., Electronics Div., 61-20 Woodside Ave., Woodside, N. Y. Phone: (212) 335-6000.
Containing a voltage regulator, the TCX0-2 temperature-compensated crystal oscillator features a frequency stabi lity of ± 2 x 10-· over the temperature range of - 40 to +75 °C. The new oscillator operates ov r the frequency range of 3 to 5 l\IHz and ages at a rate of
± 1 x 10-8 / wcck. It is packaged in
a four-cubic m. case and weighs only 5 oz.

INFORMATION RETRIEVAL NUMBER 87 142

CIRCLE NO. 299
ELECTRONIC DESIGN 25, December 6, 1970

Tips on cooling off hot semiconductors
See how other circuit designers use IERC heat sinks/dissipators to hold junction temperatures below rated maximums, improve circuit performance and reliability

mounted, low power "plastic" transistors can be operated at up to 65 % more power with IERC dissipators. They cost only pennies, provide excellent retention in severe environments, reduce failures from solder heat during assembly. 5 different styles; both single and dual models.

For low capacitance between transistor and chassis, use IERC Thermal Links with BeO washers. BeO has the thermal conductivity of aluminum, yet cuts capacitance up to 2/3r~s . Excellent dissipators and retainers. Each size fits a complete JEDEC case diameter range for T05's and TO I8's. Dual and quad models also.

Replace elaborate forced air cooling systems for power devices. IERC fluid cooled systems provide up to 1,000 watts of dissipation in less than 45 cu. in. Parallel or series flow; open or closed loop systems. All standard mounting hole patterns; specials, too. Lengths from 6" to 3' standard.

Is yours a special heat problem? Talk to the

thermal specialists at IERC. They have the

problem solving experience to come up with

a practical, low cost solution.

T03's, T066's, T015's and other

Free 4-page Short Form Catalog.

case-mounted devices can be

Complete ordering and pricing

operated with many times more

information on the world's

power when mounted in UP's.

broadest line of heat sinks/ dissi-

In still air, the staggered fingers

pators and retainers for lead and

dissipate by radiation and con-

- - -· case mounted semiconductors.

vection. In forced air, turbulence

moves the air around each finger.

Efficient in any direction. Outper-

IERC 1~1 forms extrusions dramatically.
Heat Sinks/Dissipators I

INTERN ATION AL ELECTRONIC RESEARCH CORPORATION/ A CORPORATE DIVISION OF DYNAMICS CORPORATION OF AMERICA/ 135 WEST MAGNOLI A AVENUE. B UR BA NK . CALIFORNIA 91502

INFORMATION RETRIEVAL NUMBER 88

LloCTRO IC DESIGN 25 , December 6, 1970

143

MODULES & SUBASSEMBLIES
7-bar-segment display retails at $3.25

Compact GaAsP display Voltage-divider decades

has flat configuration

cost as low as $5

I_. [@l ""' 1::1-

:1:1-

::-1,

-1 ,- I
I ::J I

C · _I

Industrial Electronic Engineers, Inc., 772'0 Lemona Ave., Van Nuys, Calif. Phone: (213) 787-0311. P&A: $3.25; 4 wk.s. - A new low-cost 7-bar-segment display costs only $3.25. Its standard features include single-plane viewing, front or rear relamping, choice of red, blue, green, grey or amber screen colors and a plug-in package with no external hardware. Options include caption display of 3 or 6 messages and rearproj ection 12-message display.
CIRCLE NO. 335

Bowroor/ Canadci Ltd., 1257 Algoma Rd., Ottawa, Ontario, Canada. Phone: (613) 746-3100.
A new monolithic multi-digit GaAsP display features 7-segment characters in a flat single-plane configuration. It can be custom designed in terms of numerals displayed and final packaging. Each numeral is affixed directly to a master PC board. Numeral character sizes of 0.07, 0.11, 0.19 and 0.25 in., each having eight leads (one is a common ground), are available.
CIRCLE NO. 336

Electronic Engineering Co. of Calif., 1441 E. Chestnut Ave.; Santa Ana, Calif. Pkone: (714) 5475651. P&A: $5; stock.
Two series 1776 thumbwheel switches, a Wolff-Poggendorf voltage divider and a 1-2-3-6 resistor decade, retail for only $5. The Wolff-Poggendorf circuit uses 9 resistors and presents a constant input resistance to a reference voltage. The· 1-2-3-6 resistor decade requires 4 resistors to obtain 9 equal increments.
CIRCLE NO. 337

QUICK OCR "GO ··· NO-GO" TEST! Delect problems before they occu r. Two 27mm reticles with handy, p<>cket-stzed 6X Comparator ror cheek in g Ar'\Sl size I & IV character set. Etched transp. red ink. Qui ck ly , easily check character size, shape, skew & spacing; stroke width , voids, smudges, peaks, nlleys, extra marks, English & met ri c scales. ~h~ciL3~~D~N°LY'i-- ....... $34.50 Ppd.
No . 30,642DA SIZE I $11.00 Ppd. No. 30,643DA SIZE II $10.75 Ppd .

$16.50 AIR POLLUTION TESTER!

1st Jow-rost survey-type Instrum ent.

Qui ck ly provides Quantitative results tn

thresh Conr.

ooldr

limit Gov't.

ranges set by Amer. Industrial 1Jyg1en lsl8.

Sensitive, accurate, \Ylde measuring

range. Inc CO,, CO, for 2 to 4

luu,dse,s
tests

2 ampoules each to test

NO, depe

and S nding

0o2o.

Surrlclent concentra -

tion. Lightweight Kit Includes stu rc.ly

vacuum pum1>. coupling tubes, complete

tn strurtl ons w1th re sult s. Rets (4)

SoCr'alerse.platoce

determine mem am-

J>Ouh·11 11vallahle separately for $4. 75 .

Stotk No . 71,349DA ...__ .. $16.50 Ppd .

144

INFORMATION RETRIEVAL NUMBER 90

4 1!. ASTRONOMICAL TELESCOPE
See craters on moon, rings of Saturn, double stars . Up to 270x. !'\ew vthration-free equatoria l mount. f / 10 mirror corrected to better than 14 wave l ength. Gi\'es theoretical limited resolu tion. Rack and pini on focusing. Aluminum tulle, 6x find er telescope. 2 standard eyepieces and Barlow lens gives power up to 270x. Rtar Chart , Ilandbook & Instrs. lncl. ShPK. wt. 42 l1J11. Stotk No. 85,I05DA ........ $94.50 F . O. B.

GIANT FREE CATALDO
Completely new 1971 edition-148 pages. Bargains galore ! New cate-oories, items, illustrations. l.OOO' s of buys for industry - Optics. Science. Math , On - the-job helps, quality control aids. Optics fur research labs, desig n engineers experimenters. Instruments for checking, mea-
suring ... to speed work, Improve quality. cut costs. Hug e selection of telescopes, microscopes. and other hard - to -get war surplus bargains. Write for Catalog DA .

EDMUND ·; 300 EOSCORP BLOG.
SCIENTIFIC CO. · - BARRINGTON, NEW JERSEY 08007

ORDEI BY STO CK NUM!U 0Pf,.. ACCOUNT TO IA.TED fllMS · MON!Y-IACK GUAIANTH

INFORMATION RETRIEVAL NUMBER 91
ELECTRONIC DESIGN 25, December 6, 1970

INFORMATION RETRIEVAL NUMBER 92

ELECTRONIC DESIGN 25, D ecember 6, 1970

145

WE'VE GOT A BETTER WAY TO MAKE PRINTED CIRCUITS!

MODULES & SUBASSEMBLIES
Hexidecimal driver operates three ways

To avoid the necessity of a multi-layer circuit board for a process computer, we produced this highdensity dual-inline doublesided board with a 6 mil line width and 8 mil line spacing. Ask us .. . we've got a better way to make printed circuits!

This 3-layer circuit board was designed to be as economic al as most doublesided circuit boards ... for the Control Data 7600 Computer. Ask us ... we've got a better way to make printed circuits I

Not all multi-layer circuit boards are small. Although some of our circuits measure a fraction of an inch, double-sided circuit board produced for a memory system measures 18" x 22". Ask us ... we've got a better way to make printed circuits!

~--I
~

APOLLO

Our circuit boards were on Apollo, LEM, and seis. e>eperiment. Sequential laminating,
extra-fine line width and spacing, plated slots and edges.

B eltone Electronics C01·p., Components Div., 4201 W. Victoria St., Chicago, Ill. Phone : (3 12) 5833600.
A new hexidecimal driver is des igned to operate as either a level changer, lamp or relay driver from IC levels. It fun ctions with s ix independent drivers or inverter circuits at a 28-V supply. When used as a driver, it drives six 28-V relays with an output of 180 mA . When used as a n inverting level chan ger, it provides outputs of 14 Vat 25 mA.
C]RCLE NO. 338
Keyboard switch module produces 1-ms closure
®

- ~-

F-111

{ - ----

New industry technique was used to produce multilayer circuit boards with an internal
heat sink.

~ 707
-~
Reliable circuit boards in high volume at low cost were producad for this project.

POSEIDON
~~ -
Developed new technology for sequential laminating multilayer circuit boards with aluminum backbone.

This design and production experience can work for you ... CALL US NOW.

CONTROL DATA
CORPORATION

CONTROL DATA CORPORATION
CIRCUITS DIVISION
7800 COMPUTER AVENUE MINNEAPOLIS. M INN . 55435
PHONE ' (612) 927-5681

INFORMATION RETRIEVAL NUMBER 93
146

Unimax Switch Corp ., sub. of Riker-Maxon, Ives, Rd., Wallingfo1·d, Conn . Phone : (2 03 ) 269-8701. P&A: $1 to $4; 1st qucirter, 1971.
A new keyboard switch module features contact closure for 1 ms during plunger depression and allows no closure on its upstroke. The mechanical one-shot provides a tacti le sensation and an a udible click coincident with the contact clos ure. The switch module is designed for moun ting on 3/4-in. keyboard centers.
CIRCLE NO . 339
ELECTRONIC D ESI GN 25 , D ecember 6, 1970

CELCO makes YOKES. They make them good. In fact, CELCO has been making the best CRT deflection yokes and focus coils in the industry for the past twenty years.
CELCO makes yokes for precision displays when you must have the highest performance available.
And CELCO makes yokes for computer terminal displays when you need reliable repetitive scan yokes for commercial purposes, at low cost.
Not only does CELCO make good yokes, but they make sure you get the right yoke for your particular CRT display requirements.
Call CELCO on your present display problem. A CELCO yoke will solve it. (It might even be one of the standard CELCO yokes listed below:)

Respected the world over for "leadership in the science of electron beam control". CELCO

CELCO PRECISION DISPLAY YOKES:
DNA702 " superfastDYNAYOKE" (2 µsec recovery time to 0.1% )
HDN428 Low-Zero Approach HDQ428 Mini-Spot, (CRT/Yoke matched)
CELCO COMPUTER TERMINAL DISPLAY YOKES:
PW Position-Write Yokes PWM Position-Write, with Pincushion Correction YA Resonant Drive, Hi-Q

CONSTANTINE ENGINEERING LABORATORIES COMPANY

MAHWAH , N . J . 07430

TEL . 201-327-t123

TWX : 710-988 - 1018

UPLAND , CAL. 91786

TEL . 714-982-0211' TWX : 910-581 - 3401

ELECTRONIC DESIGN 25, D ecembe r 6, 197 0

INFORMATION RETRIEVAL NUMBER 94

147

INSTRUMENTATION
15-MHz counter kit has a $200 price tag
14570. <

50-MHz pulse generator Tiny Wheatstone bridge

costs just $555

spans 0.08!1 to 120 Mn

Heath Co., B enton Harbor, Mich. Phone : ( 616 ) 983-3961 . P&A: $199.95; stock.
The new model IB-101 counter provides counting from 1 Hz to 15 MHz for only $199.95, in kit form. An ove rran ge indicator and five cold-cathode display tubes are included. Readings are made to the nearest kHz or Hz with a twoposition range switch. Triggering is from 100 mV to 200 V and input impedance is 1 Mn shunted by 20 pF. Assembly takes only 5 hours.
CIRCLE NO. 340

Data Dynamics Div. of Electronic Count ers, ·inc., 240 Humphrey St., Englewood, N. J. Phone: (201) 567-5300. P&A: $555; stock.
Model 5101 19-in-rack-mountable pulse generator is capable of pulse r epetition rates of 1 Hz to 50 MHz at a low cost of $555. There are three separate active and simultan eous outputs : a positive pulse, a negative pulse and an IC-compatible output pulse for TTL, RTL and DTL ICs. Single and double pulses may be selected.
CIRCLE NO. 341

Siem ens Corp., 186 Wood Ave. S., lselin, N. J. Phone: (201 ) 4941000.
A new portable direct-reading Wheatstone bridge has 9 measurement ranges covering resistances from 0.08 n to 120 M.n for voltages up to 500 V. The bridge is battery operated, has pushbutton controls and balances by means of a rotary knob with a scale on which resistance values can be read directly. A built-in shockproof galvanometer is of the taut-strip-suspension type. A battery check is also included.
CIRCLE NO. 342

ARITECH VOLTAGE CONTROLLED FILTERS
s
can help you

HY
capacitors
built for your job requirem ents

Specialty capacitors for:

solve problems in radar, telemetry, voice coding, signal conditioning, data acquisition,
plus many other areas.

VCFs allow you to electronically shift cut-off frequency without affecting the shape of the response. They are compact, stable, and extremely reliable.

Our standard VCFs - now in stock - are 4-pole

Butterworth, 24 dB/octave, either high-pass, low-pass,

dr band-pass.

Cut-off Frequency Range

0.1 Hz to 20 kHz

Tuning Ratio

50:1

Tuning Voltage

0 to 5 VDC

Module Size

0.75" x 2.15" x 2.15"

Quantity prices for some versions - under $80.

See us also for custom active filters.

ARITECI+ 130 Lincoln St., Brighton, Mass. 02135

coRP

Telephone: (6171 254-2990

· HVDC Power Supplies - standard and special values
· Energy Storage Capacitors - m1n1mum inductance & maximum current
· Laser & Radar Applications Line Type Modulators pulse forming networks (self-contained for low & medium power); external coils & pulse capacitors (for high power morl11l;:itors) Hard Tube Modulators: storage capacitors (low, medium & high power, low inductance) We will be pleased to quote on your particular
requirements. Just write for spec1f1cat1on order sheet Or call 914-279-8091 and Don Corson will be glad to supply you with any 1nformat1on.

HIFOTRONICEI ®

CORSON DIVISION
HIPOTRONICS, INC.
BREWSTER, NEW YORK 10509 (914\279-8091
Telex 710-574-2420

INFORMATION RETRIEVAL NUMBER 95
148

INFORMATION RETRIEVAL NUMBER 96
EL ECTRONIC DESIGN 25 , December 6, 1970

Here~ the solution...

Philips'
ID·ln·tature
Plumbicon*

(actual size)

... now whats your problem?

We 'll tell you the truth . It took a lot of imagination to build

this TV camera tube.

With a diameter of just 5/8", it's just about half the size

of Philips' famous Plumbicon tube preferred all over the world

for its speed of response, resolution and sensitivity.

Yet the performance of the mini-Plumbicon is comparable to

that of its big brother.

Now it's your turn .

What could a half-sized Plumbicon mean to you?

A whole new range of miniature broadcast cameras?

A solution to a tricky CCTV application . .. maybe industrial . ..

or military ... or even in space? A new medical monitoring

concept, perhaps? Or something to simplify outside

broadcasting reportage?

Maybe it's the key to a new idea for a data transmission

link ... or the heart of an intelligence or security system .

What about colour microscopy?

But as we said it's your turn .

*Registered trademark of N.V. Philips' Gloellampenfabrleken for TV camera tubes.
N.V. Ph ilips' Gloeilampenfabrieken - Eindhoven , the Netherlands Manufactured , distributed and sold in the U.S. by Amperex Electronic Corporation, Electro-Optical Devices Division , Slatersville R. I.
~ electro nic components
~ and materials

PHILIPS

INFORMATION RETRIEVAL NUMBER 97

ELECTRONIC D ES IGN 25, December 6, 1970

149

INSTRUMENTATION

Line monitor/booster handles 2 kW for $245

Rugged and critically demanding applications in all types of industrial and commercial equipment and systems have proven the inherent quality and reliability of Adlake's mercury displacement relays. Available in QUICK ACTING and TIME DELAY types, these relays are ideal for widely varying switching applications where reliability is paramount.
ELECTRICAL DETAILS
Contact Arrangments : Time Delay SPST (N.O. or N.C.) (Up to 3 poles) Quick Acting SPST (N.O. or N.C.) (Up to 3 poles)
Contact Rating : Time Delay· 0.1 to 15 amps Quick Acting 30 to 100 amps
·Depending upon nature of load, voltage, length of time delay, and timing function .
Contact Resistance : Time Delay 28 milliohms max. Quick Acting 1 to 5 milliohms max. depending on construction .
Life : 5 million operations minimum.
Time Delays: Available up to 1800 seconds.
MECHANICAL DETAILS
Hermetically sealed contacts; stainless steel enclosed, all welded construction. Magnetic circuits finished black wrinkle enamel, cadmium plated and lacquered. Epoxy molded coils-guaranteed for life.

MERCURY WETTED CONTACT RELAYS

DRY REED RELAYS

R&B Instrum ents, Inc., P. 0. Box 84, Glen Rock, N. J. Phone : ( 201 ) 445-2178. P&A: $177, $245.50; 6 to 8 wks.
The PLM-105 power line monitor and PLB-105 line booster which plugs into the monitor combine to offer a low-cost method of monitor-
ing the line at 1% accuracy with
300 W ( model A ) or 2000 W ( model B) of power. The monitor indicates conditions below 105 V ac with a blinking red light. A steady amber light, a memory which stays on until r eset, indicates that previous undervoltages occurred.
CIRCLE NO. 333

Low, stable contact resistance and "1billion-operation" life qualify Sensitive Mercury Wetted Contact Relays for a wide array of switching applications, such as digital and analog computers, telecommunications systems, multiplex, industrial control equipment, power control devices. New Series MWK and AWK Sensitive Relays offer contact form K (SPST, center off) - ideal for multiple channel switching.

Miniature, intermediate, and standard sizes offer A and B contact forms with from 1 to 4 poles of switching. Typical life is 20 x 106 operations (rated load) or 500 x 106 operations (dry circuit).

USE READER-SERVICE NUMBER FOR COMPLETE INFORMATION

THE ADAMS & WESTLAKE COMPANY

Elkhart. Indiana 46514 · (219) 264·1141 · TWX (219) 522-3102 · TELEX 25·8458 · Cable ADLAKE

~ ALLIED A SUBSIDIARY OF

PROOUCTS CORPORATION

INFORMATION RETRIEVAL NUMBER 98
150

Modular instruments form a complete system
T ektronix, Inc., P. 0. Box 500, B eaverton, Ore. Phone : ( 503 ) 6440161. P&A: $495, $430, $300, $485, $280; 4 wks.
The 2600 series of modular instruments is designed to generate, condition, mix and amplify a variety of signals. They consist of the 2601 mainframe and four-plugin modules: the 26Gl rate/ramp generator, the 26G2 ramp generator, the 26G3 pulse generator and the 26Al operational amplifier. Inputs and outputs are all fully TTL compatible.
CIRCLE NO. 334
ELECTRONIC DESIGN 25, December 6, 1970

behind every
successful
key

there's a coil

Data lovers, how do these frequencies grab you?

600Hz
697Hz 770Hz 852Hz
941Hz 1070Hz 1098Hz

1200Hz
1209Hz 1270Hz 1336Hz
1477Hz 1633Hz 1950Hz

2025Hz 2050Hz 2150Hz 2200Hz
2225Hz 2250Hz 2350Hz

Applications :
As fixed and adjustable inductors for low frequency filters. As transformers for tone frequenc ies used in push button telephone oscillator circuits and data sets; coupling and impedance matching applications.

Features:
High and low profile units, p/c mounting, fine tuning, tuning adjustment at least ± 3% from nominal, TC matches polystyrene capac itors, high Q - custom designs, impregnated coils, for extreme environments.

Vaddin data coils by

Transformers, Inductors, Filters, Pulse Transformers? We've got those too!
Aladdin Electronics shows you more than 20,000 different magnetic components in the new Aladdin Encyclopedia of Capabilities· real Supermarket in Print for designers. Unique double binder shows Applications and Configurations .. . makes it easy for you to select components by telling us the performance characteristics you want. II you'll write on your lellerhead (telling us a few things about yourself and your company please). we'll send you a FREE COPY of the Encyclopedia.
ALADDIN ELECTRONICS A Division of Aladdin Industries, Inc. 703 Murfreesboro Road Nashville, Tennessee 37210
ELECTRON IC DESIGN 25, December 6, 1970

I
151

DATA PROCESSING
Desktop CRT copier lowers cost to 2¢/copy

9600-baud analyzer checks data distortion

15-digit calculator performs 253 steps

A. B. Dick Co., Videograph Operations, 5700 W . T ouhy Ave., Chicago, Ill. P rice: $2500.
The 9750 desktop copier produces hard paper copies of a CRT display at a cost of less t han 2¢/ copy. Copying speed is 12 seconds for the first reproduction and 8 seconds for successive copies. Paper-handling capacity of t he new copier is one 460-foot long roll. T he -copier comb ines an electrostatic system with a built-in CRT monitor.
CIRCLE NO. 345

Digit ech Data Industries, Inc., 66 Grove St., Ridgefield, Conn. Phone : ( 203) 438-3731.
T he Datachek analyzer oper ates at baud rates up to 9600 bits/ second to measure signal distortions due to telegraph and data set communications networks. It will display distortion percentage in 1% increments and it can check vertical parity on eight-level codes. Polar, neu tral and low or hi ghlevel signals can be used as inputs. The unit comes in a portable carrying case.
CIRCLE NO. 346

Sony Corp. of America, 47-47 Van Dam St., Long Island City, N . Y. Phone: (212 ) 361 -8600. P rice : $2400.
T he Sobax LCC 2700W is a 15digit calculator with 253 steps and 12 memories. It also contains conditional or unconditional branch in g, as well as the insertion of separate programs. Debugging of programs is also another of its capabi lities. All programs are produced fro m the calculator's keyboard a nd can be reproduced on magnetic cards.
CIRCLE NO. 347

Happy Endings ...

INFORMATION RETRIEVAL NUMBER 101
152

Precision Metal Terminals
Whether you need term inals from stock or of special design - tell us your requ i rements. Our free engineering assistance in terminal selection or design will provide the happy ending. We precision-machine your specials, often with no tooling charge. Or select from over 500 stock items, the most complete line in the industry. You can look to PMP for precisionmade mini-pins too, for use in connectors, micro modules and every mini purpose.
Send tor our latest complete catalog.
PRECISION METAL PRODUCTS CO.
41 ELM ST., STONEHAM, MASS. 02180 Telephone: (Area Code 617) 438·3650
INFORMATION RETRIEVAL NUMBER 102
EL ECTRON IC D ESIGN 25, December 6, 1970

PACKAGING & MATERIALS

NEED A
10,000 VOLT ZENER DIODE?

Diamonite Products Co.,

U. S. Ceramic Tile Co., Shreve,

Ohio. Phone: (216) 567-4211.

Manufactured for LSI and hy-

brid packages, new multi-shaped

alumina substrate ceramics are

available in thicknesses greater

than 0.035 in. They are produced

by powder pressing to assure a

high degree of uniformity. A wide

range of sizes are offered with high

mechanical strength, good t hermal

conductivity and electrical and

thermal shock resistance.

CIRCLE NO. 348

Breadboarding card holds 20 14-pin DIPs

A P Inc., 72 Corwin Dr., Painesville, Ohio. Phone: (216) 357-5597. P&A: $48.60; stock.
The Unicard II versatile breadboarding card can accommodate up to 20 14-pin DIPs, 17 16-pin DIPs or 12 20-pin DIPs in addition to T0-5 cans. It features a turretpost for convenient termination to the back-side ground plane, drilledhole solder points on the powerdistribution busses that accommodate AWG 20 wire sizes and rubber feet for sturdy bench work.
CIRCLE NO. 349
ELECTRONIC DESIGN 25, December 6, 1970

Corotron 3000V actual size: Photo·
multiplier power supply, showing
Corotron location, 2h size.

You could string together several hundred zeners. Or you

could specify one Victoreen Corotron. It is the gaseous equiv·

alent of the zener with all the advantages of an ideal HV zener

diode.

For space research and other rugged applications requiring

absolute power supply stability, GV3S Series, shown, provide

the ideal reference voltage anywhere in the range of 400 to 3000

volts. They enable circuitry to maintain constant high voltage

regardless of battery source voltage or load current variations.

Cubage and weight (GV3S Corotron weighs only 4 gm.) are

important considerations. So is temperature variation (Coro-

trons operate from 200°C down to -65°C). Ruggedized versions

withstand shock to 2000 G, vibration 10 to 2000 cps.

If you're trying to simplify circuits ... to cut cost, size and

weight . .. to upgrade performance-you need Corotron high

voltage regulators . Models are available now from 400 to 30,000

volts. A consultation with our Applications Engineering Dept.

will speed up the countdown.

oMA s2s

VICTDREEN
VICTOREEN INSTRUMENT DIV. of VLN
10101 WOODLAND AVENUE · CLEVELAND, OHIO 44104
EUROPE: ARN DALE HOUSE, THE PRECINCT: EGHAM, SURREY, ENGLAND· TEI: EGHAM 4187
INFORMATION RETRIEVAL NUMBER 103
153

ru +o.r, +0.1%

PHASEMETER ACCURACY

These highly accurate, versatile

instruments not only measure

phase angle over the 0.5Hz to

2MHz frequency range, but also

offer readings, independent of

amplitude, over wide regions of variation. Complete with selectable, single ended, true
differential inputs, the 1·200 series is entirely solid state (except for readouts) and requires
no adjustment during operation.
In short, the Series 1·200 phasemeters are simply the best

·
Series 1-200 Phasemeters From $1,150.

·...
\;

available today, with accuracy

guaranteed by a factor of 3 to 20

times better than others.

Of particular interest are these

critical "specs" for each of the 3

models in this product group ...

Model 1·220- ± 0.1°, ± 0.1%

digital readout (50 Hz to

200 KHz)

Model 1·210- ± 0.1°, ± 0.2% For optional accessories, prices and full details

digital readout (50 Hz to ca// or write.

200 KHz) Model 1·200- ± 0.1°, ± 0.1%
DC, not digital (50 Hz to 200 KHz)

IU NU-DEVICES1 1Nc. 18 Marshall Street, Norwalk, Conn. 06854

Phone: (203) 853-3410

INFORMATION RETRIEVAL NUMBER l 05

TOOLS & ENGINEERING AIDS
PC-board probe system gauges coatings
Unit Process Assemblies, I nc., 5315 37 Ave., Woodside, N. Y. Phone: (212) 899-9090.
A new precision probe system measures printed-circuit board coatings instantly and accurately. The CB-3 can measure the smallest lines, tabs and isolated pads . Its positioning is aided by a magnifier and by cross hairs whose images li e directly on the area being measured. Different measuring probes can be instantly snapped into the system with relative ease.
CIRCLE NO . 350

DON'Tl<ID

¥OURSELF!
This won't ward off heart disease. But a gift to the Heart Fund will help protect your heart and the hearts you love.

Portable comparator checks differences

CtHttrlb·,.4 by th· l'·bllih<r
154

GIVE\f/
so more will live
HEART FUND

Electrnvert, Inc., 86 Hartford Ave., Mount V ernon, N. Y. Phone: (914 ) M04-6090 .
The Mini Flicka 58 is a portable optical comparator which visually magnifies and emphasizes the differences between two simi lar objects. In operation, the standard and the sample are placed on separate illuminated viewing stages and are visually superimopsed through a set of optics. The two objects are alternately presented to the observer and differences appear as a visual flicker.
CIRCLE NO. 351

ELECTRONIC DESIGN 25, December 6, 1970

START WITH A LENS-END LAMP

TEST FOR SPOT SIZE AND CANDLEPOWER
\NELD PINS TO END OF LEAD WIRES

Faul-Coradi, Inc., 27 F ennell st.';
Skaneateles," N, Y . Phone: (315) 685-5761.
The MKII precision lighthead for lightbeam drafting on photosensitive film using the Coradomat 21 plotter positions symbols to within ± 0.0005 in. It features a dual set of optics, one for line drafting and the other for flashing of images . Conversion from a cut-and-strip operation to a lightbeam drafting operation using the MKII takes just three minutes.
CIRCLE NO. 320

MOLD
TO MAKE A PLUG-IN LIGHT MODULE THAT WILL ACTIVATE PHOTO ELECTRIC SENSOR IN
A HIGH SPEED CHECK SORTER

Plastic welding tools heat up to 350°C

Caig Lalioratories, Inc.,

We specialize in finding practical solutions to small applications where cataloged items won't do. Write, describing your requirement. Tung-Sol Division, Wagner Electric Corporation, 630 W. Mt. Pleasant Avenue, Livingston, N.J. 07039. TWX: 710-994-4865. Phone: (201) 992-1100.

Union Ave., West bury, Phone: (516) 334-1940. $18 .75, $26; stock.
Two new welding tools for plastics, #611-001 and #611-005, deliver blade temperatures of 300 and 350°C, respectively. The former is rated for 200 W and measures 3-in. deep by 3-in. wide. The latter is

TUNG·SOL®
WHERE BIG THINGS ARE DONE WITH SMALL LAMPS
® Reg . T.M. Wagner Electric Corporation

rated for 300 W and measures 2-3/4-in. deep by 4-3/4-in. wide. Both use 110 V ac for operation and incorporate nickel-plated electrolytic copper blades.
CIRCLE NO. 321

INFORMATION RETRIEVAL NUMBER 107

ELECTRONIC D ESIGN 25, December 6, 1970 INFORMATION RETlilEVAL NUMBER 108 ~

.Q~,AoNoOu.auL,L1 I~ FRITCH ~~$-
CONTACTS- I 7 ·2·111>c _; SIGNAL - 4 GROVN[). 3

Volume Resistance of Thermosetting Compounds
at 160° F, 100°k RH

evaluation samples

c- o__ JERMYN(i)

o_ §? _<?-_ ~·

l~Q Q§?

Component hardware
A new range of supplementary hardware for use with sub-miniature components is available on a sample card with sixty-seven samples, free of charge. Injection molded from nylon or polypropylene, the hardware items include panel washers, two sizes of anti-vibration clips for small capacitors, mounting pads designed for transistors, diodes and multi-lead ICs and special pads for converting-lead configurations to meet printed circuitboard layout requirements. Jermyn Industries.
CIRCLE NO. 352

Which resin do you pick?
That's right! OAP. That's our DAPON® and DAPON M diallyl phthalate resins. filled with glass fiber. on top after 900 hours at 160 degrees F (70 degrees C) and 100 percent relative humidity. The property being measured is volume resistivity which is what an insulating plastic is all about.
The story is more involved than that. of course. Let us send you reprints of "Chemical and Thermal Resistance of Thermosetting Molding Materials" and "The Effects of Temperature and Humidity on Electrical Properties of Thermosetting Plastics" and get the complete story.

~ ORGAN.IC CHEMICALS DIVISION
f1JJJ!j FMC CORPORATION

CORPORATION ·ii 156

633 Third Avenue, New York, N. Y.10017 INFORMATION RETRIEVAL NUMBER 109

Heat-shrink tubing
Penntube VII-B is a new neoprene flame-retardent heat shrinkable tubing that reduces a full 50 % in size upon application of heat in excess of 160 °F. It can be used over sharp edges without cracking and provides resistance to corrosion and chemicals. It can also be shrunk down in hot water above 140°F. Free samples are available, Penntube Plastics Co., Inc.
CIRCLE NO . 353
ELECTRONIC DESIGN 25, December 6, 1970

Get low-cost transient protection in
a microcircuit package.

Capable of deflecting overvoltage transients in

--r- 50 nano-seconds or less, the new
TRANSTECTOW Circuit Protector Hybrid Crowbar can operate in

--~::>

circuits carrying up to 10 Amps .

Standard overvoltage trip points

from 5 to 200 VDC.

Conveniently packaged in standard dual in-line

integrated circuit and D0-27 diode cases-it permits you

to save space on your printed circuit or multi-layer boards

by 3 to 1 over the old method of using discrete components.

Find out about Transtector Systems from M &T Chemicals

Inc., 532 Monterey Pass Road , Monterey Park, Calif.

91754 . Tel. (213) 283-9278.

* Trad emark of M&T Chemi ca ls Inc.
~s~!RY~f~~E~!~~~o~~A~~ ®

QwiJc:'JjJ*
'For 'Fast
8triiin %lief

M&T can make you look good.
INFORMATION RETRIEVAL NUMBER 11 O

Soshin's One Mica
The only mi evaluation testing
equivalen

inger Speciality acitors
citors to pass anese Government L-C-5D

~505HINELECTRIC CO., LTD. Rm. 920. TOC Bldg . 22 -17, Nishi-Gotanda 7·choma, Tokyo. Japan Cables : SOSHINCAPACITOR Telex: 246-6501
INFORMATION RETRIEVAL NUMBER 111
EL ECTRONIC DESIGN 25 , December 6, 1970

Qwik·Ty, New Connector-ToCable Strain Relief

THERE IS NOTHING LIKE IT IN CABLE CLAMPS
The new LOW PROFILE 90° and Straight QWIK·TY's are the
first Innovation in connector cable clamps in over 30 years! QWIK·TY relieves strain 6 times
faster and weighs as much as 70% less than conventional · cable clamps. Simply wrap a plastic tie strap or lacing tape around QWIK·TY's arm and wire
bundles are captured and tightly secured ... in seconds!
It's that simple.
INSTALLED COST - DOWN WEIGHT SAVINGS - UP

AVAILABLE FOR Al.L POPULAR CYLINDRICAL CONNECTORS

MIL·SPEC

r:.~tl

STRAIGHT

90°

Mll·C-5015 Mll-C-26482 Mll-C-26500/
38300 Mll·C-38999 Mll·C-81511 Mll·C-83723
(threaded)
NAS-1599/ Mll·C-83723
DEUTSCH MICRODOT And Others

GTROS GTROO
GTROl GTR84 GTR03
GTR86
GTR02 GTR06 GTROB

GTR25 GTR20
GTR21 GTR87 GTR23
GTR89
GTR22 GTR26 GTR28

For flat Relief· .·· call or write for demonstration and literature, todayl

·u.s. and Forei1n Patents Pendin1

ir. ·lena·······:····1 ~~f1N~:=·~~~·/ GLENDALE, CALIFORNIA 91201 i PHONE (213) 247·6000 I TWX 910-497·2066
················"··] TELEX 67-3485

INFORMATION RETRIEVAL NUMBER 112
157

design aids
There is a difference in Heath Dynamics' Quartz Crystal Filters!

For a true record

f. t
In

esmerpveir.caet

ure ...

Tempi~lab el0

Easy to use ...

Heath Dynamics specializes 1n the design and manufacture of the highest quality Quartz Crystal Filters and Discriminators for the Communications Industry Our facility is completely new. inside and out. fully staffed and equipped with the most modern mechanical and electronic test measuring devices. We employ the assistance of one of the largest time sharing computers available. Heath Dynamics· area of specialization includes the manufacture of miniature and sub-miniature filters in the range of 10 thru 32 Mhz. Bandwidths may be from .025% thru .35% 1n the smallest packages and may range up to 2.0% in the larger ones. We manufacture direct replacement filters for all the current monolithic designs using our half lattice configuration which yield lower insertion loss. lower ripple and greater ultimate rejection. Yet our filters cost less and faster delivery is guaranteed!
All Heath Dynamics' crystal filters designed and manufactured to your particular specifications meet Mil F. 18327 In short. we want your business and we'll act like it. Do us both a favor and send us your print or specification for a quote If you have any questions just write or call us .. we 're here to serve you
L heath
~_d_y_n_a_m_ic_s_,_i_n_c_. 6050 n. 52nd a1·etwe Rlendale, arizona fi530/ (602) 934-5234
subsidiary of Heath International, Inc .. Richmond, Mich.
INFORMATION RETRIEVAL NUMBER 113
158

Easy to read

Opto-electron ics kits
Two new design kits, the Interface Answer Kit and the GaAsLite Answer Kit, provide circuit designers with a wide variety of optoelectronic products with which to experiment. The former contains three different opto-isolators, each in a six-lead dual-in-line iso-dip package. They include the MCD2 photo-diode coupled pair with fast response, the l\1CT2 photo-transistor coupled pair with high gain and the MCS2 photo-SCR coupled pair for ac applications. The latter kit has four types of indicator lights: the green l\1V2, two amber MVl's, two red MVlOB's and two red 1VIV50's. These are packaged in T0-18 headers. Both design kits are available at a cost of only $9.95 each. Monsanto Electronic Special Products.
CIRCLE NO. 354

TempilabelG rt"fl'll- c oiu·

: TM EM P ERATe URE MO ONITOR~

:C~T~aICK·~~ING~~~

AFTER

Self·adhesive Tempilabels0 assure dependable monitoring of attained temperatures. Heat-sensitive indicators, sealed under the ·
little round windows, turn black and provide a permanent record of the temperature history. Tempilabel 0 can be removed -easily to document a report.

~·a"oz..1"7

;

~~=::...i

AVAILABLE
Within the range 100· to 500°F Tempi· labels· are available to indicate a single temperature rating each - and also in a wide choice of four-temper· ature combinations per TempilabelO.

JUST A FEW OF THE TYPICAL APPLICATIONS

LED select ion chart
A complete chart for selecting GaAs LEDs is available. The selector guide provides a full description of LED characteristics that include wavelengths, brightness levels, forward voltage and current ratings, power output levels and manufacturer's names, to help the design engineer decide the best LED lamp for his application. Included with the selector guide is a . emiconductor report which reviews the technology, products, pricing and economics of semiconductors. Semiconductor Specialists, Inc.

· Electrical Apparatus · Electronic Assemblies · Appliance Warranties · Aircraft and Rockets · Machinery and Equipment · Storage and Transportation of Heat Sensitive Materials.
For descriptive literature and a sample Templlabel 0 for evaluation ... (please state temperature range of interest).

... ,,,~+""'"~ (>'lo
( Tempfz 0

'I'~,.

0 OIVISION OF
o" BIG THREE INDUSTRIAL

""<> p R 0-P~

GAS & EDUIPMENT CO.

132 WEST 22nd St .· NEW YORK. N.Y. 10011 Phone: 212 · 675 -6610 TWX : 212 · 640-5478

CIRCLE NO. 355

INFORMATION RETRIEVAL NUMBER 114

ELECTRONIC DESIGN 25 , December 6. 1970

HYBRID MOS DIP application MULTIPLEXER notes

HYBRID/MONOLITHIC DESIGN

110-degree TV design
A twenty-page booklet entitled "Si ngle-stage circuit and equali sat ion of pi ncus h ion di stortions for 110 ° colour T V sets" details circuit des ign requirements for color TV sets t hat use 110-degree defl ection systems. It includes an abundance of sketches a nd schematic di agrams illustr ating t he top ics covered. AEG-Telefunken Corp .
CIRCLE NO. 330

e DTL-TTL Compatible e Power Off Isolation e Hermetically-Sealed e Operation - 55 to 85°C
The ZD410E1 is a four-channel multiplexer featuring MOS switches and apatented "power off" isolation of 10 megohms. Channel "off" impedance is 100 megohms. The multiplexer is DTL and TTL compatible and offers excellent performance in both low and high level data applications.
Accuracy of the un it is specified at 0.01% with crosstalk less than 2 mV for 20V p-p input signal (1 kHz). The multiplexer accepts -5V to +lOV or ±lOV input signals with input capacitance of less than 25 pF for selected (ON) channel. Additional features include enable input, single-line control, and standard DIP pin spacing.
ZELTEX also offers a complete line of 8 to 15-bit conversion products; as well as operational amplifiers, function modules and power supplies. See our complete catalog in the 1970-71 EEM, Volume 2, pages 1344-1347 or call 415-686-6660, TWX 910-481-9477.
The New Leaders in Hybrid/Monolithic Products
A SUBSIDIARY OF REDCOR CORP.
1000 Chalomar Road - Concord, California 94520
INFORMATION RETRIEVAL NUMBER 1 1 S

Microwave measurement
A swept-freque ncy mi cr owave measurement system is expla in ed in detail in an appli cation note. It shows how fixed-frequency or octave-band swept measurements may be made over an 80-dB dynami c range over the frequency range of 100 MHz to 40 GHz . Some of t he measurements described include insertion loss, bandpass-filter and directional-coupler characteristics, swept standing-wave ratios and attenuator and reflectometer characteristics. Scientific-Atlanta, Inc.
CIRCLE NO 331
DIa/d converters
The principles of d/a a nd a / d converters are exp la ined in a n eight-page technical appli cation note. It begins with a description of pri nciples of temper atu r e compen sation in quad switches whi ch depend on a closed-loop current-forcing scheme and explains the inherent gain cor rection provided by the inclusion of amplifier feedback resistors with in t h in-film resistor packages. The practical
design aspects of a typical 0.01 %-
accurate 12-bit d/a conver ter are also dealt with . Among the points further discussed are techniques for stamping out possible parasitic osci llations, temperature compensating tricks and cascadin g arrangements for binary and BCD operations. Analog Devices. Inc.
CIRCLE NO . 332
ON READER SERVICE CARD CIRCLE 116 ~

Calibrate or Measure
with the
RFL Model 829G
RFL's famous 829, for 15 years the industry calibration standard, now gives way to the new 829G - still the industry calibration standard, but now it's twice as useful. The 829G provides a precision source of AC and DC volts, amps and ohms - plus precision measurements of these parameters from external sources. It offers four-terminal sensing in both source and measurement modes, and high accuracy, resolution and regulation, with 5-digit readout. 5 ranges of AC or DC, 0.1 to IOOOV. 6 ranges of current, 100 uA to IOA. 50, 60, 400, 1000 Hz AC plus EXT. And many other features all for just $3,350. D Write for complete data today. RFL Industries, Inc., Instrumentation Div., Boonton, New Jersey 07005. Tel: (201) 334-3100 I TWX: 710-
987-8352 I CABLE RADAIRCO, N. J.
RFL Industries, Inc.

Now you can save space and improve reliability by mounting an Acopian mini-module power supply directly into a printed circuit board . Sizes start at 2 .32" x 1.82" x 1". Both single and dual outputs are available. And the duals can be used to power . op amps or for unbalanced loads. Other features include: · Choice of 58 different single output
modules ranging from 1 to 28 volts, 40 ma to 500 ma · 406 combinations of dual output modules with electrically independent, Iike or different outputs in each section · 0 .02 to 0 .1% load and line regula tion , depend ing on model · 0 .5 mv RMS ripple · Prices as low as $39 for singles , $58 for duals Do you have the latest Acopian catalog? It lists over 82 ,000 AC to DC power modules for industrial or MILspec applications. For your copy, write Acopian Corp ., Easton, Pa. 18042, or call (215) 258-5441. And remember , every Acopian power module is shipped with this tag ...
INFORMATION RETRIEVAL NUMBER 117
160

new literature
Edmund Scientific catalog
Just about any scientific and optical item from a 95¢ lens used in the Apollo mooncraft to a $4210 laboratory lens can be found in the 1971 148-page Edmund Scientific catalog. Over 4000 unusual items are crammed between its coverR. Edmund Scientific Co.
CIRCLE NO. 356
Analog instrumentation
A 48-page condensed product guide provides designers with a convenient reference manual for selection guidelines, application tips, and operating techniques for analog instrumentation. Teledyne Philbrick Nexus.
CIRCLE NO. 357
Potentiometers
Over 100 precision potentiometers are detailed in a 20-page brochure. Bourns, Inc., Trimpot D iv.
CIRCLE NO. 358
Thermocouples
A six-page brochure on thermocouple assemblies includes standard, angle-type, and pipe-extended assemblies. Pyco, Inc.
CIRCLE NO. 359

Lafayette catalog
Lafayette Radio's 50th anniversary catalog with 112 pages of stereo-fidelity, photographic, recording equipment and accessories is available. It also includes typewriters, two-way radios, watches and clocks, vacuum cleaners and weather instruments. Lafayette Radio Electronics.
CIRCLE NO . 361
Linear IC chips
Linear IC chips that include operational amplifiers, voltage regulators, video amplifiers, comparators, multipliers, transistor arrays and sense amplifiers are shown in a 12-page catalog. Silicon General, Inc.
CIRCLE NO. 362
Ultra-microfiche
A six-page folder explains and illustrates the new ultra-microfiche technology which makes it possible to place as many as 6000 images on a transparent p lastic card measuring 3 by 5 or 4 by 6 in. Images Enterprises, Inc.
CIRCLE NO . 363
Cords and plugs
A twelve-page catalog lists a variety of patch, switchboard and test cords and test plugs. Lynn Electronics Corp.
CIRCLE NO. 364
Miniature inductors
A new brochure describes a line of miniature inductors for microcircuit applications. Cambridge Thermionic Corp.
CIRCLE NO . 365

Tubes and semiconductors
Mor e t ha n 23,000 types of electron tubes and semiconductors are cover ed in t his 60-page price-list catalog. Sections include: industrial cathode-ray tubes, tube-replacement transistors and SCRs and I Cs. JSH E lectronics, Inc.
CIRCLE NO. 360

High-voltage devices
A new 32-page catalog includes electrical and mechanical specifications along with applicat ion and dimensional data for high-voltage lead assemblies, harnesses, r eceptacles and hermeticall>' sealed connectors. Capitron Div. of Al\IP Inc.
CIRCLE NO. 366

ELECTRON IC D ESIGN 25. December 6. 1970

MinifBus by Rogers

A small, voltage-distributing busbar for PC card application , each Mini/Bus gives you buil t-in capacitance ... noise-cutting capacitance that means more reliable, compact circuit packaging at a fraction of multilayer prices. Write for data.
Rogers Corporation I Rogers, Conn. 06263
INFORMATION RETRIEVAL NUMBER 118
INFORMATION RETRIEVAL NUMBER 119
ELECTRON IC D ESIGN 25, Decembe r 6, 1970

use our wire-wrap* cambi-cards to keep your ic's in line

Matter of fact, we'll help you package whole IC subsystems. Start with our 4.5 x 4.5 inch or 4.5 x 9.25 inch Cambi-Card®printed circuit boards with 70-pin input/ output edge connectors, containing Wire-Wrap sockets for 14, 16 or 24-pin dual in-line IC's. Then our precision fabricated card files with 13 or 26 positions. Next our 13 or 26 position power planes.
And if you need 'em, our card extenders, Wire-Wrap card connectors, blank Cambi-Cards for discretes, pluggable/ patchable breadboards for 16, 32 or 64 DIPS, patch cord kits .. . even our super fast, economical wire-wrapping service.
For details, call us or write for Catalog 92, the latest word on IC accessories and wire-wrapping. Cambridge Thermion ic Corporation, 445 Concord Avenue, Cambridge, Mass. 02138. Phone: (617) 491-5400. In Los Angeles, 8703 La Tijera Boulevard 90045. Phone: (213) 776-0472.
* Registered Mark ol Gardner-Denver Co.
Standard ize on

The Guaranteed Electron ic Components

'·

INFORMATION RETRIEVAL NUMBER 120

16 1

SHIELDED BOXES
Take Y.OUr
pick.

NEW LITERATURE

Ferrite beads
A four-page brochure describes several ferrite bead materials of standard sizes, and gives application notes. Ferronics Inc.
CIRCLE NO. 367

A single pair of wires, or a
leased te lephone line, can carry the audio signals for a complete control system.

REMOTE CONTROL

For inaccessible areas or mobile installations, a radio transmitter and re-
ceiver system con carry the signals.

SWITCHING WITH

AUDIO SIGNALS

(actual size)

(Shown V3 size) .
The newly expanded line of Pomona Shielded "Black Boxes" now comes in six different sizes ; in cast or extruded aluminum ; some slotted to accept circuit boards ; in a broad choice of connector combinations or no connectors. There's bound to be one to meet your requirement. Write for complete information in our General Catalog.
~POMONA
.-..... ELECTRONICS
1500 E. Ninth Street ·Pomona, California 91766
INFORMATION RETRIEVAL NUMBER 121
162

De power kits
An extensive catalog describes 450 professional de power supply k its, regu lated by the engineer and technician. Kits are available in choke or capacitor-input versions
and with 0.15 or 0.01 % r egulation.
Techni-kit Div., Universal Electronics Co.
CIRCLE NO. 368
IC sockets
A 38-page catalog lists IC sockets, systems, and accessories for dual-in-line, flat-pack, and T0-5 IC products. Robinson-Nu gent, Inc.
CIRCLE NO . 369
Hardware
Catalog AM-1 lists captive panel screws, retainers, standoffs, handles, ferru les, washers, spacers, term inals and self-lockin g nu ts. E lectronic Hardware Corp.
CIRCLE NO. 370
Potentiometers
Specifications on a series of 10turn precision potentiometers are · contained in a new brochure. Beckman Instruments, Inc.
CIRCLE NO. 371
Dry reed relays
Seventeen pages of detailed specifications for 56 types of PC-board dry reed relays are included in a new catalog. C.P. Clare & Co.
CIRCLE NO . 372

contactless resonant reed encoder I decoder
.395 x .620 x 1.100
An audio tone can be generated by an electronic oscillator or resonant reed encoder circuit, then transmitted by wire or radio. The tone activates a resonant reed relay to perform a control function.
Bramco reeds permit over 100 selective control frequencies within the 67 to 3000 Hz. spectrum. This is assured by: (1) the narrow response band-width of about 1% for decoders and (2) the high accuracy of Bramco reed encoders (1 I 10 of 1% of design frequency).
A big advantage of reeds in control switching is that they are ideally suited for simultaneous and sequential coded tone systems. The actual number of control functions possible in such a system is virtually unlimited. For example, over 3300 individual control functions are possible with only 16 frequencies coded sequentially in groups of three.
Compared to other types of tone filters, resonant reeds are small and inexpensive. They give more control functions per spectrum, per size, per dollar.
If you work with controls that select, command, regulate, or indicate, you should know how it can be done with audio signals. We custom design and
stock a broad line of encoder I decoder
components and modules. Bramco also custom designs LC filters from 0 to 200 KHz.
For literature write Bramco Controls Division, Ledex Inc., College and South Streets, Piqua, Ohio, or call 513-773-8271.
'i¥1id
BRAMCO CONTROLS DIVISION LEDEX INC.
College and South Streets, Piqua, Ohio 45356

INFORMATION RETRIEVAL NUMBER 122
ELECTRONIC D ESIGN 25, December 6, 1970

I
·)
Transistors
A six-page economy transistor brochure covers an expanded line of 41 plastic-encapsulated silicon power transistors. An easy-to-read chart lists electrical parameters for each device. Texas Instruments, Inc.
CIRCLE NO. 373
Data transmission
New devices for data transmission in industrial monitoring and control systems are shown in a 12page brochure. Larse Corp.
CIRCLE NO. 374
Toroids
A line of packaged toroids for pulse applications is featured in a catalog. The new line is available in core sizes from 1/16 to 1/2-in. inside dia. James Electronics Inc.
CIRCLE NO . 375
S/d converters
A variety of single and multichannel synchro-to-digital converters are included in a brochure. Singer-General Precision, Inc., Kearfott Div.
CIRCLE NO. 376
Clock oscillators
A four-page brochure details crystal-controlled clock oscillators that are TTL/ DTL compatible. Vectron, Laboratories, Inc.
CIRCLE NO . 377
Manual switches
A new 64-page catalog contains a variety of pushbuttons, indicators and toggle switches. Micro Switch Div. of Honeywell, Inc.
CIRCLE NO. 378
ELECTRONIC DESIGN 25, December 6, 1970

Buy these units complete, or their switch and

control modules separately Model 2400 Crossbar

..----..l!I . ·':'B'J:- ft :

Scanner. Includes: 1. Crossbar Module .. (Model 2100) with capacity from 100 six-wire to 600 single-wire channels. Scans
up to 60 channels/sec. 2. Control Module (Model

2300) can control more than

one Crossbar Module.

Model 2500 Guarded Reed Scanner.

Includes: 1. Reed Switch

Module (Model 2200) with

10 to 100 three-wire channels . , _ - -· ··

Scans up to 250 channels /

-- . · ·

sec. 2. Control Module

... ·

(Model 2300) can control up to

10 Reed Switch Modules (1000 channels) .

Both scanners and their switches are especially ideal for low-level and low thermal switching, accept BCD address
(other optional), and are modular, expandable and 19" rack-mountable. Read the details on Model 2400 (Bui-
letin 324) and Model 2500 (Bulletin

325).Write Cunningham Corporation, 10 Carriage Street, Honeoye Falls,
CCNewoUYornrpk n1o44I.7rn2a.gt1h·oanm

SUBSIDIARY OF GLEASON WORKS INFORMATION RETRIEVAL NUMBER 123
163

NEW LITERATURE

Avanrek chip transistors
now available for thin film
circuitry!

Avantek, leading producer of thin film microwave amplifiers and microwave transistors, now offers a complete line of smallsignal, VHF, UHF, L and S Band silicon chip transistors.
Ideal for companies desiring to build their own integrated circuits, Avantek chip transistors feature:

1) Low noise flgure ··.VHF through S Band.
2) Gold metallization.
3) Wide selection of performance options.
4) Avallabll1ty from stock to 30 days ARO.

Representative models include:

Generic Freq. Band Chip Type Avantek Model

VHF UHF
L BAND S BAND

CT-25 CT-25A
CT-51 CT-50A CT-55
CT-24 CT-24A
CT-20A CT-20B
CT-30 CT-22 CT-32

AT-25 AT-25 A, AT-25 B
AT-51 , AT-52 AT-50 , AT-50A AT-55
AT-241 , AT-242 AT-240, AT-240A
AT-201. AT-201A AT-201 B
AT-301 , AT-301 A
AT-220 AT-320

In addition, every packet of Avantek chip transistors is guaranteed to be traceable to the same wafer.
For the finest in MIC designs and circuitry, specify Avantek chip transistors.

Avantek
Avantek, Inc. 2981 Copper Rd.,
Santa Clara, Ca. 95051
Phone: (408) 739-6170
Cable:AVANTEK
Advanced engineering opportunities are now available. Avantek Is an equal opportunity employer.
INFORMATION RETRIEVAL NUMBER 124
164

Silicon rectifiers
A 12-page catalog contains detailed information on integrated bridge, epoxy bridge and high-voltage diffused silicon rectifiers. Varo Semiconductor Div.
CIRCLE NO. 379

THIS
IS A RELAY

Stepper motors
An expanded line of stepper motors and controllers is contained in a new four-page bulletin. Clifton Div. of Litton Industries.
CIRCLE NO. 380

A MERCURY-WETTED RELAY THAT OPERATES
IN ANY POSITION

Function modules
A new eight-page short-form catalog lists specifications and app lications of a/ d and d/ a converters, sample-hold modules, multiplexers and comparators. Analog Devices, Inc.
CIRCLE NO. 381
Hall effect devices
Hall effect devices such as gaussmeters, Hall multipliers, magnet processing systems, nondestructive testers and wattmeter transducers are shown in a short-form catalog. F. W. Bell, Inc.

Don't be fooled by the dual-in-line pack· age. It's a Logcell® mercury-film relay that is completely compatible with DTL / TTL power driver IC's. It operates in any mounting position without contact bounce. And you can mount it into DIP-drilled printed circuit boards or DIP sockets without special handling. Other features include:
· Long life-tested to billions of cycles
· 2.5 millisecond speed
· Thermal noise less than 1 microvolt
· AC noise below instrumentation levels · IO ·b to 1 ampere load switching range
· Open circu it resistance in excess of 10,000 megohms
· 0.05 ohms maximum contact resistance
· Available in bi-stable or mono-stable configurations

CIRCLE NO. 382
Component ovens
Specifically designed for the engineer requiring a temperaturecontrolled environment, a new handbook/catalog provides usefu l definitions and illu strations of temperature-controlled component ovens. Oven Industri es, Inc.

Logcell DIP relays open new vistas of switching system operation and packaging. For more information, write Fifth Dimension Inc., Box 483, Princeton, New Jersey 08540 or call (609) 924-5990.
FIFTH DIMENSION INC.

CIRCLE NO . 383

INFORMATION RETRIEVAL NUMBER 125
ELECTRON IC D ES IGN 25, December 6, 1970

Wire products
A colorfu l 72-page illu strated publication describes more than 7000 wire, cable and tubing products. Included are descriptions and specifications for products ranging from hook-up wire and multi-conductor cable to coaxial cable and zipper tubin g. Alpha Wire Corp.
CIRCLE NO. 384
Switches
Illustrated and described in a 16-page catalog are prec1s10n switches and typical switch assemblies with actuators. Haydon Switch & Instrument, Inc.
CIRCLE NO. 385
Electrolytic capacitors
A new four-pag.e folder features axial-lead and upright radial-lead low-voltage aluminum electrolytic capacitors. International Electronics Corp., Capacitor Div.
CIRCLE NO. 386
Switches
140 models of precision electric switches are covered in a 40-page publication which gives a complete cross-reference to other manufacturers' products. Robertshaw Controls Co.
CIRCLE NO. 387
Thick-film hybrids
Low-power thick-film hybrid circuits that include flip-flops, buffers, gates, drivers, binary modules and encoders are shown in a catalog. Spacetac Inc.
CIRCLE NO. 388
Capacitance bridges
Automatic capacitance bridges and classifiers are described in a new brochure. Teradyne, Inc.
CIRCLE NO. 389
ELECTRONIC DESIGN 25, December 6, 1970

suark&enaoteisrse

·@, ··..

-,1,~\/lI

~-·

Electro Cube RC networks can chew and swallow at least 200,000,000 tough, jagged edge arcs, sparks and noise transients (when operated according to specifications) . Standard molded units have 125to500VAC,200to 2,000VDC
ratings. Custom metal or molded units, single or multicircuit, designed to your electrical, packaging and mounting requirements. Brochure on request. Call or write for engineering assistance. (213) 283-0511. 1710 South Del Mar Ave ., San Gabriel, Calif. 91776.
· ~~tf£g~~ inc.
INFORMATION RETRIEVAL NUMBER 126

Let Wesco engineers help solve your aircraft or industrial solenoid problem. Hundreds of proven designs available, or Wesco will design to meet your specifications. Here are some of the features available: · High temp units exceed 500° F. · Adjustable plunger travel · Units pressure sealed to 10,000 p.s.i. · Push or pull types · Miniature, medium and heavy duty types · All voltages available Please write for our latest brochure and, remember, when you think of solenoids, think of Wesco!
The trademark on millions of solenoids since 1927
WEST COAST ELECTRICAL MFG. CO.
233 WEST 116TH PLACE . LOS ANGELES . CALIFORNIA 90061 . PHONE (213) 755 1138
INFORMATION RETREIVAL NUMBER 127
165

10% OFF
Call Now

NEW LITERATURE
N/C equipment
A 32-page catalog describes a line of numerical controls plus auxiliary equipment. Covered are features and programming procedures of point-to-point positioning, point-to-point and straightline milling, and continuous-path contouring controls. Superior Electric Co.
CIRCLE NO. 390

Getting small components critically clean. Is it critical to your operation?

Wire strippers
A full line of hand and benchmounted wire strippers is illustrated and described in an eight-page brochure. The brochure offers helpful suggestions on how to select the correct wire stripper for your specific requirements. Ideal Industries, Inc.
CIRCLE NO . 391

Reactive hybrid modules

Digital Panel Meters

a~ and 4~ digits

All of the high quality DPM's listed below are specially priced with a 10% discount in quantities of 1-9. If you call or write within 7 days as a result of this ad (you must mention this publication), you will receive a 10% discount card good for one month.
If you require specials for OEM applications such as ratiometers, comparators, or customs (mechanical/ electrical) we would like to quote it and give you the best price.

Take off 10% from these Published 1-9 Prices

3¥2 digit Model 510 Unipolar $195. Now $175.50 3¥2 digit Model 520 Autopolarity $225. Now $202.50 41(2 digit Model 720 Autopolarity $370. Now $333.00

,----------- ----- - -i

1D
1
I D

I need complete specifications and information. Send literature! Send me a 10% discount card. No obliga-

I I

I tion. It's good for 30 days.

I Model: D 510

1
1

D D

520 720

Quantity------

I Name--------------

1 Title _ _ _ _ _ _ _ _ _ _ _ _ __

I Company _ _ _ _ _ _ _ _ _ _ _ __ 1
I Address------,.-------1
I CitY--------------

I State

ZiP-----

: 1

Datascan Inc.

I
1

I 1111 Paulison Avenue, Clifton, New Jersey 07013:
Ii _ _ _ _ _ _ _(2_ 01_ ) 4_ 78-_ 28_ 00_ _ _ - - - 91- 3 I

INFORMATION RETRIEVAL NUMBER 128
166

Diagrams, specifications and performance curves for a line of reactive hybrid components are included in . a five-page catalog. Relearn.
CIRCLE NO . 392

Resistors
Low-cost precision wire-wound resistors are described in an eightpage booklet which gives technical, price and availability information, specifications and power derating curves. General Resistance.
!:IRCLE NO. 393
Connectors
A complete four-page test report on a series of connectors tested to MIL-STD-202, MIL-C-8384B, MILC-24308 (Navy ) and MIL-C-24308 (modified ) specifications is available. Microdot, Inc.
CIRCLE NO . 394
Microwave components
Broadband microwave compo- · nents covering the frequency range of de to 1 GHz are shown in a brochure. They include power dividers/ combiners, couplers, mixers, baluns and rf impedance transformers . Olektron Corp.
CIRCLE NO. 395

The Cobehn spray cleaning method gets small parts and assemblies critically clean. It's fast, efficient and easy. Just as important, It's been proven In hundreds of tough applications , both on an automated and manual basis.
This combination of versatility and critical cleanliness has made the Cobehn process ideal for cleaning a host of small components such as contacts in relays, switches, choppers and voltage regulators, as well as semiconductors, crystals, slip rings communicators, printed circuits, instrument and jewel bearings .
How does it work? In two ways. First, Cobehn Solvent, a fractionally distilled material of chemically pure composition, is power-sprayed against a component with a high velocity stream of filtered, heated air.
The solvent completely removes all traces of soluble materials such as oil, grease, silicone lubricants, resin flux and fingerprints. All without any trace of film or residue. The insolubles are then driven off the part by a blast of warm filtered air.
This combined liquid-scrubbing action leaves components totally free of contamination, critically clean and completely dry.
If you'd like more information, or a demonstration, write: Cobehn, Inc., 226 Passaic Avenue, Fairfield, N.J . 07006. Or call (201) 227-6675.
Cobehn
Proven parts cleaning.

INFORMATION RETRIEVAL NUMBER 129
ELECTRONIC DESIGN 25 , December 6, 1970

bulletin board
of product news and developments

ULTRA LOW DUAL-IN-LINE SOCKETS
PRECISION MACHINED CONTACTS

A new leadless packaging system for MOS LSI ICs that mounts on its edge has been jointly developed and produced by Texas Instruments, Attleboro, Mass., American Micro-Systems, Santa Clara, Calif. and Coors Porcelain, Golden, Colo. The system, which reportedly cuts LSI and IC packaging costs in half, uses a flat ceramic package with its leads metallized onto the ceramic substrate and an edgeboard connector.
CIRCLE NO. 396
To prove the uniformity, quality and reliability of its water-scribing equipment, Quantronix Corp., Smithtown, N.Y. is offering to scribe a sample silicon wafer to requested specifications, free of charge.
CIRCLE NO. 397
J. W. Microelectronics Corp., Philadelphia, Pa., has developed a 1-in.-square hybrid circuit that incorporates both digital and linear circuits on one substrate. The package houses thick-film and MOS ICs.
CIRCLE NO. 398
Ultra-high-speed LSI ICs having average propagation delays of 1.1 ns have been developed by Hitachi, Ltd. of Japan. Hitachi claims that the new ICs will cut computer sizes to one-tenth that of current models and increase computing speeds 20 times.
CIRCLE NO. 399
An experimental silicon FET with a 14-GHz cutoff frequency has been developed by scientists of IBM's Research Div., Yorktown Heights, N. Y.
EL ECTRONIC D ESIGN 25 , December 6, 1970

· Sockets available with 14 and 16 contacts in PC termination.
· Directly interchangeable! Terminal pattern and size identical to IC package.
· Molded glass filled nylon insulator with polarization notch.
· Raised numbers permit easy identification of contacts.
· .125 inch overall height.

Request Data Sheet 166H

AU6AT.NC.

TEL: 617 /222-2202 31 PERRY AVE., ATTLEBORO, MASS . 02703

INFORMATION RETRIEVAL NUMBER 130

Where reliability really counts!
The reliability of Zenith Flat-Face Metal CRTs is demonstrated by their extensive use in enroute air traffic control centers and airports. When safety depends on rel iab i Ii ty, Zenith is specified! Shouldn't you take advantage of Zenith CRT quality in your application? Write for details.

2a11rH ZEN I TH RAD I 0 CORP 0 RATION

~Jl'ff~

THE RAULAND DIVISION

5616 W . JARVIS AVE . · CHICAGO , ILL. 60648 · 312 -647-8000

INFORMATION RETRIEVAL NUMBER 131

167

Electronic Design Design Data from

ELECTRONIC DESIGN'S function is:
· To aid progress in the electronics manufacturing industry by promoting good design.
· To give the electronic design engineer C(>ncepts and ideas that make his job easier and more productive.
· To provide a central source of timely electronics information.
· To promote two-way communication between manufacturer and engineer.
Want a subscription? ELECTRONIC DESIGN is sent free to qualified engineers a nd engineering managers do.ing design work, supervising design or setting standards in the United States and Western Europe. For a free subscription, use the postfree application form inside the back cover. If none is included, write to us direct for an application form.
If you do not qualify, you may take out a paid subscription for $25 a year in the U.S.A., $35 a year elsewhere. Single copies are $1.50 each.
If you change your address, send us an old mailing label and your new address; there is generally a prepaid postcard for this inside the back cover. You will have to requalify to continue receiving ELECTRONIC DESIGN free.
The accuracy policy of ELECTRONIC DESIGN is:
· To make reasonable efforts to ensure the accuracy of editorial matter.
· To publish prompt corrections whenever inaccuracies are brought to our attention. Corrections !lPpear at the end of the Letters column.
· To refuse any advertisement deemed to be misleading or fraudulent.
Microfilm cop ies are avai lable of complete volumes of ELECTRONIC DES JC: N at $19.00 per volume , beg·inn in g with Volum e 9, 1961. Work is now in process to complete the mi crofilm ed ition of Volumes 1-8. Reprints of individual a rti cles may be obtained for $2.00 each, prepaid ( $.50 for each additional copy of the same artic le) no matter how long the article. For further detai ls and to place orders, contact the Customer Service~ DPpa r tment, Unive rsity Microfilms, 300 North Zeeb Road, Ann Arbor, Michigan 48101i; tel e phone ( 313) 761-'1700.
Want to contact us? If you have any comments or wish to submit a manuscript or article outline, address your correspondence to:
Editor ELECTRONIC DESIGN, 850 Third Avenu e, New York, N.Y. 10022.
168

Crystal technology a mystery?

This free new 60-page illustrated ERIE Frequency Control Catalog will clear it up. Contains detailed information on ... ERIE's complete line of crys tals, crystal oscillators , crystal filters and ovens. Plus . . . the industry's most comprehensive refresher course in crystal , filter, oscillator and oven technology. Covers theory, production and design applications .. . MIL standards , environmental tests and mechanical hardware ... all in understandable language. All you need to know to write specifications like an expert. Just off the press. Send for your copy now.

Erie Frequency Control
453 Lincoln Street, Carlisle, Pennsylvania 17013 (717) 249-2232 · Telex 084-2328

CIRCLE NO. 171

New PC Drafting Aids Catalog

- . ,;J BYBUK
~--·····-·

The By-Buk 1970-71 catalog of pressure sensiti ve printed circuit drafting aids is now available. With thousands of ideas to promote accuracy and efficiency in printed circuit master artwork lay outs. Featured are new artwork patterns for : TO cans, multi-pads , dual in-lines and flat packs. Also the most comprehensive listings of conductor line tapes, pads , donuts, connector strips , elbows, corners, etc. Available in opaque black , transparent red and transparent blue materials. Send for your free catalog and samples.

By-Buk Company
4326 W. Pico Blvd. Los Angeles, California 90019
(213) 937-3511

CIRCLE NO. 172

FUNDAMENTALS OF INTEGRATED CIRCUITS

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F·AIU'JITAU OF llTEWTED CllCllTS

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A practical guide to integrated circuits, their theory , manufacture , and applications. This new guide by Lothar Stern offers compete, highly readable coverage of the various techniques of circuit fabrication, and their effect on circuit de·

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sign and performance. As to marketing con sideration s, it compares the characteristics of the numerous IC structures devised to date in terms of econ omi cs and logistics . A volume in the Motorola Series in Solid -State Electronics. 198 pages, 7 x 10, illu strated. $8 .95 , clothbound. Circle the reader-service number below for 15day exam in ation copies.

Hayden Book Company, Inc.

CIRCLE NO. 173

116 West 14th Street

New York, N.Y. 10011

ELECTRONIC D ESIGN 25, December 6, 1970

Manufacturers
Advertisements of boolclets, brochures, catalog< and data sheets. To order use Reader-ServiceC:ard ( !ldvertisement)

MINIATURE SOLID-STATE SERVO AMPLIFIERS

Servo 400 Hl Amplifiers

Send today for Bulova's 1970 Bulletin 100 on 400Hz Servo Amplifiers suitable for commercial, industrial and military applications. Listed servo amplifiers range from 2 to 40 watts output power. Includes complete electrical and physical spec information on an off-the-shelf line of Servo Amplifiers, with all related data necessary for the circuit designer. Easy-to-follow chart sets forth all related design guidelines from input to output characteristics. Design criteria of units described meet mil-spec requirements under MIL-E-5272, MIL-E-5400 and MIL-1 -26600. Free copies of this 8-page bulletin available upon request.

Bulova Watch Company Inc.
Electronics Division 61-20 Woodside Avenue Woodside, New York 11377

CIRCLE NO . 174

Improved 500-Line Analyzer Reads Peak Automatically

1111111111111
Precision REAL-TIME
Spectrum Analysis

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For on-line studies of noise, vibration , radar,. underwater signals. The peak of a varying fre· quency component is automatically tracked by new UA-68 Ubiquitous ll Real -Time Spectrum Analyzer - a constant readout can be produced regardless of frequency drift or variation ; for direct plotting of amplitude vs rpm for a rotating machine, & long-term monitoring of single frequencies . Also 1000-line power spectral density analysis & improved hi-temp performance to 130°F. 40 kHz max. range, continuous input and output level monitoring, 5 mHz direct input, builtin capability for expansion into a real -time cor-
relation & cross-PSD system . Send for catalog.

Federal Scientific Corporation
a subsidiary of Elgin National Industries, Inc. 615 West !31st Street, New York, N. Y. 10027

CIRCLE NO . 175

A guide to transducer design & operation

A practical guide describing virtually all existing transducers - their application, calibration , specification & testing . Cuts through the haze of trade names, tell ing all you need about the sensing end of test & data acquisition systems . 377 illustrations show low-cost uses & how to predict behavior under adverse condi· tions . Covers all physical measurands & helps save time, money & uncertainty in selecting & using trans ducers. Discusses devices such as photodiodes, shaftangle encoders, contactless sensors, semiconductor nuclear-radiation sensors, & transducers with integral excitation. Pub. Oct. 1969, 704 pp., 377 illus .. 7 x 9", $27 .95 . Circle the reader service number below tor a 15-day examination copy .

Prentice-Hall, Inc.
Englewood Cliffs, N. J. 07632

CIRCLE NO. 176

ELECTRONIC D ESIG 25, D ecember 6, 1970

Electronic Design
Advertising Sales Staff Keith Aldrich Sales Manager
New York 10022 Robert W. Gascoigne Samuel M. Deitch Daniel J. Rowland 850 Third Avenue (212) Plaza 1-5530 TWX: 867 -7866
Philadelphia 19025 Mort Sullivan P.O. Box 126 Dresher, Pa . (215) 884-6880
Boston 02154 Joseph F. Palmer 1268 Main Street Waltham, Mass. (617) 894-2700
Chicago 60611 Thomas P. Kavooras Berry Conner, Jr. 200 E'ast Ontario (312) 337 -0588
Cleveland Thomas P. Kavooras (Chicago) (312) 33 7-0588 (call collect)
Los Angeles 90303 Stanley I. Ehrenclou Jerry D. Latta 2930 Imperial Highway Inglewood , Calif. (213) 757 -0183
San Francisco 94022 Arthur R. Shields, Jr. 95 Main Street Los Altos , Calif . (415) 941-3084
Londqn W. 1 For United Kingdom and Holland
Brayton C. Nichols 44 Conduit Street Tel: REGent 4714
Verviers, Belgium For Continental Europe
Andre Jamar 1, Rue Mallar, 1 087) 253.83 Telex 41563
Tokyo Haruki Hirayama Elect ronic Media Service 5th Floor, Lila Bldg., 4 -9-8 Roppongi Minato-ku Phone: 402-4556 Cable: Electronicmedia , Tokyo
1-1#41
...__.~
AMERICAN BUSINESS PRESS, INC.
169

advertisers index

Advertiser

Page

AMP, Incorporated ------------------------ 10, 11 Abbott Transistor Laboratories
Incorporated -------- ----------------------- ----- 13 Acopi a n Corp. --------------------- -- -------------160 Adams & Westlake Company, The.... 150 Aerovox Co rporation ------------------------ 59 Aertech Industries, Inc. -------------------- 145 Alco Electronic Products, Inc..... I 44, I52 Allen-Bradley Co. ----------------------------2, 20 Aladdin Electronics. a Division of
Aladdin Industries, Inc. ________________ I51 Alpha Wire, a Division of
Loral Co rporation __________________________ J 61
American Lava Co rporation -------------- 43 Analogic Co rporation ------------------------ 138 Ari tech Corp. ------------------------------------- -148 Arnold Engineering Company, The.... 56
Atlee Corporation ------------------------------ 40 Augat, Inc. ------------------------------- -- -------- -167 Automatic Electric Company ________ 14, 15
Avantek, Inc. -------------------------------------- 164

Bodine Electric Company ---------------- 44 Boston Insulated Wire and
Cable Company ------------------------------ 134 Bra mco Controls Division ,
Ledex. Inc. -------------------------------------- 162 Bud Radio, Inc. ---------------------------------- 95 Bulova Electronics Division of
Bul ova Watch Company --------------- - 7 Bulova Servo Products Electronics
Divi sion of Bulova Watch Company ---------------------------------------- 169 Bu rndy Co rporation ---------- ---------------- 111 By-Bu k Company --------------------------------168
Cambridge Thermionic Corporation 161 CE LCO (Constantine Engineering
Laboratories Co.) -------------------------- 147 Ce lanese Pl ast ics Company ---------------- 24 Cent ra lah Semiconductor Division,
Globe-Union. Inc. -------------------------- '0 I C la re & Co., C. P. ---------------------------- 53 CCoohbnehnC.oIrnpc... S--i--g--m---u--n--d----_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-__-_-_-_--_-_-_-_ 1f 2626 Co nstantine Engineering Labs.
Co. (CELCO) ____________________________ ___ J47 Co ntrol Data Corporation ________________ J46 Cunningham Cor poration __________________ J 63
Da le Electronics, Inc. ________________Cover Tl Da mon /E lectronics Division ------------ 69 Dat asca n. Inc. -------------------------------------- 166 Da ve n, Division of McGraw-Edison 119 Dou glas Randa ll, Inc. ------------------------ 155 Dow Corning Co rporation ....... .54, 72, 73
Edmund Scientific Company ___________ .J44 Electro Cube. Inc. ------------------------------ 165 Electro-Motive Mfg. Co., Inc., The.... 129 Electronic Coil Co rporation ______________ J28 Electronic Design ------------------------------ 114 Electronic Memories. Inc. ________ I02, 103 English Electric Valve Co. , Ltd ....... I28A
170

Advertiser

Page

Erie Frequency Control ____________________ J68 Erie Technological Products, Inc,______ 52 FMC Corporation ________ ______________________ 156 Fabri-Tek, Incorporated, National
Connector Division ---------- --- ---------- - 29 Federal Scientific Corporation ___ __ _____ 169 Fifth Dimension , Inc. ________________________ J64

Fluke Mfg. Co., Inc. , John ---------------- 60

Advertiser

Page

Philbrick / Nexus Research, A Teledyne Company -------------------- 99
Philips Electronic Measuring
Instruments ----------- -- ------------------------- 149 Pomona Electronics ---------------------------- I 62 Practical Automation, Inc. ________________ J24 Preci sion Metal Products Co. ____________ J 52
Prentice-Hall, Inc. ------------------------------ 169

General Electric Company ____ ________ 5 I, 9 I Genisco Technology Corporation ____ __ 64 Glenaire, Inc. ------------ -------------------------- 157 Gould, Inc., Graphics Division ....76, 77 Grayhill , Inc. -- ----------- ----- -------------------- 120

Hamlin, Inc. ---------------------- ----- ------------- 62 Hayden Book Company,

Inc. --------------------------------128B, I68, 171 Heath Dynamics, Inc. ________ _____________ ___ J58

Hewlett-Pack a rd ------------·--------------- 1, 4, 5 Hipotronic.:~, Inc. ---------------------- ---------- 148 Honeywell, Computer Control

HonD_eiv)lis~ieolnl

------------------------------------ ---- ---Test Instrument

D1 VISIOn --------------------------------------------141

Inland Contro ls, A Division of Kol Imorgen -------------------------------------- 132
International Electron ic Research Corporation ------------------------------------ 143

Jan co Corporation ________________________ ______ J36 Johanson Manufacturing Corp. ________ 42

KKEeiVthleEylecItnrsotnruicms eCntosr,p.In_c__.____-_-_--_-_-_-_-_-_-__-_-_-_-_-_- 1426

Ledex Microelectronics, Ledex, Inc. I26

RCA Electronic Components and Devices ____________ J2, 13 I, Cover IV
RFL Industries, Inc. ___ ______ ___ ______________ J59 Rel com -------------- ----- --------------------- 108, I09 Remex Electronics
Division of Ex-Cello Corporation ... .J 20, I 24, 128, I33, 135 Roga n Brothers, Inc. _____________ _____________ J 36 Rogers Corporation ---------------------- --- --- 161 Rohde & Schwarz ---------------------------- 128B
Sercel ----- ---------------- -- ------------------------- 128C Servo Tek Products Company __________ l 30 Signalite Divisio n of General
Instruments ---- -------------------------------- --125 Signetics Corporation -- -- -------------------- 27 Silicon General. Inc. -------------------------- 57 Solitron De vices. Inc. ____ ____________________ I21 Soshin Electric Co., Ltd. ____________________ f 57 Spectra Electronics, Inc. -------------------- 106 Sprague Electric Company ---------------- 18 Stackpole Carbon Company -------------- 50 Systems Engineering Laboratories 34, 35
TRW, Inc., Capacitor Division ________ J J6 Tektronix, Inc. ------------------------------------ 47 Teletype Corporation ____________________ 84, 85 Tempi! Division of Big Three
Indu stri a l Gas and Equipment Co. 158 Triplett Corporation --------------------- ----- I 39 Tung Sol Divi sio n. Wag ner
Electric Corporation _____________________ _) 55

3M Company. Chemical Division ..... .123 M & T Chemicals, Inc. ______________________ 157 Magnetics. A Division of Spang
Industries. Inc. __________________ ,_____________ 8, 9
Malco Mfg. Company, Inc. ---------------- 58 Mallory Capacitor Company ____________ 127 Midtex. Incorporated, Aemco
Division --- --- ------------------------------------ -- 41 MMoolnesxa.ntIoncCoorpmopraanteyd __-_-_-_-_-_-_-__-_-_-_-_-_-_-_-_--C---o--v--e--r I2I3I Motorola Semiconductor Products.
Inc. __________________________ J6, 17, 48. 49, I 15

Unitrode Cor poration --------------------3 1, 33
Varadyne Systems, A Division of Varadyne. Inc. ------------- ------------- 63
Vero Electronics. Inc. ------------------------ 140 Victoreen Instru ment Division ___ _______ 153
Wang Laboratories, Inc. ------------- ------- 97 West Coast Electric Mfg. Co. ____________ 165

North Atlantic.: Industries, Inc. -------- 61 Nu-Devices. Inc. -------------------- --------------154

Xerox Data Systems --------- ----------------- 93

OPCOA. Inc. --------------------------------------13 7

ZZeelntietxh. TRnacd. io----C---o--r-p--o--r--a--t-i-o--n-----_-_-_-_-_-__-_-_-_-_-_-_-_-_-_-]' 6579

ELECTRONIC DFSIGN 25. December 6. 1970

Up-to-date and thorough PE Examination Guides

These two volumes offer the most convenient and economical coverage of the subject matter that must be mastered to successfully pass the preliminary examination (Engineer-in-Training) and the final examination for the professional license in electrical engineering.
Each concise, carefully organized volume presents problems from recent state examinations together with complete step-by-step solutions. Provid ing rapid access

to important topics, vital for " open book" examinations, each also includes numerous pertinent illustrations and Iists of references for further study.
Prepared by practicing engineers, the books have been written on the premise that the reader is versed in engineering, and that he is approaching the time when his State Board of Examiners will consider him qualified for taking the examinations .

BASIC ENGINEERING
SCIENCES AND
STRUCTURAL ENGINEERING
FOR ENGINEERIN-TRAINING EXAMINATIONS

ELECTRICAL ENGINEERING AND ECONOMICS AND ETHICS FOR PROFESSIONAL ENGINEERING EXAMINATIONS

H. JACK APFELBAUM, P.E. , Department of Mechanical Engineering, Lowell Technological Institute; and
WALTER 0 . OTTESEN, P.E. , Paten t Counsel
Comprehens ive and well balanced in its coverage of the concepts and techniques fundamental to all areas of engineering practice, this volume presents nearly two-hundred problems careful ly chosen from recent exam inations given by the individual states . Typical of the material the reader is likely to encounter in Engineer-in-Training Examinations, these are con ven iently arranged by subject, and cover three broad areas: background material in mathematics, physics, and chemistry; the basic engineering sc ie nces: statics, dynamics, fluid mechanics, thermodynamics, electricity, and engineering economy; and seven chapters detailing topics in structural engineering. Introductory sections precede each subject area and its fully worked-out problems, providing background in the specific concepts, principles, and term inology. More than three-hundred detailed illustrations insure a complete grasp of problem-solving techniques. # 5712. 408 pages, illustrated, $13.95

JOHNS. LYONS, P.E.; and STANLEY W. DUBLIN, Insti-
tute of Environmental Medicine, New York University
Medical Center
Presenting a wide range of problems in electrical engineering, this book concentrates on the subjects and topics that form the basis for an ever-changing technology. The portion of the book devoted to economics and legal and ethical considerations is equally com plete, providing in-depth understanding that will prove valuable in future engineering assignments.
Almost one-hundred problems in electrical engineering range from basic circuitry to the uncategorizable "bonus" problems frequently encountered in exami nations. More than onehundred-seventy illustrations illustrate the text. The section on economics features an unusual approach to such topics as interest, costs, valuation, and the like - the summa ri zed use of for-
mulas in solving nearly fifty t ypical problems. # 5715, 320 pages,
illustrated, $12.95.

Hayden Professional Engineering Examination Series, LAWRENCE J.. HOL'LANDER, P.E.,
Editor-in-Chief. Subsequent volumes will focus on mechanical and civil engineering.

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ELECTRONIC D ESIGN 25. D ecemhcr 6. 1970

17 1

product index
Information Retrieval Service. New Products , Evaluation Samples (ES), Design Aids (DA), Application Notes (AN) , and New Literature (NL) in this issue are listed here with page and Information Retrieval numbers. Reader requests will be promptly processed by computer and mailed to the manufacturer within three days.