File Info : application/pdf, 162 Pages, 78.19MB

Electronic Design V18 N11 19700524

FOR ENGINEERS AND ENG INEERING MANAGERS

MAY 24, 1970

Electronics is invading sports.
From scuba diving to ski racing, engineers are rolling up points. But their biggest gains are in computer-operated scoreboards.

The giant animated displays of these megabuck marvels have thousands of incandescent lamps that pose stringent problems in solid-state control. See page 36.

Collins connects with Dale Edge boards
Here's a better .156" edgeboard. Proven in dozens of applicationsincluding Collins' high performance MX-106 Radio Carrier System shown here. Specify the EBT 156 for single readout 1/16" card applications where you must blend low cost with worry-free performance. Special protected entry aligns and straightens board before contact is made. Prevents contact damage and makes it easier to handle out-oftolerance boards. Withstands 250 insertion/removal cycles ... <1 µ.sec. discontinuity during vibration and shock tests per MIL-C-210978. Dale's EBT 156 is available in six models-8 to 22 contacts. Wirewrap, eyelet or dip solder terminals. Need higher densities? Check Dale's .050" Thinline series. They' re both in our complete new catalog.
PHONE 605-66tH:MU1 OR WRITE TODAY!
DALE ELECTRONICS, INC.
Box 180, Yankton , South Dakota 57078 A subsidiary of The Lionel Corpora tion
INFORMATION RETRIEVAL NUMBER 232

"'\ \

)

/
/

A wave analyzer with a 10,000-second sweep time?
Why? 090/ 6

... because, in low-frequency spectrum analysis work, you need to use a narrow-bandwidth window. The narrower the window you use, the slower you must sweep it across the frequency range to be analyzed . And the slower you sweep, the smaller a frequency range you can cover in any given time. Thus, until now, your choice has been either accuracy or range but not both.
The new HP 3590A/3595A system solves that dilemma. The HP 3595A plug-in is a sweeping local oscillator

with 10,000 seconds of sweep time available. By using it with the HP 3590A Wave Analyzer mainframe, you can scan the entire three-decade audio frequency range at 2 Hz per second , in one sweep . And , by adding an HP X-Y recorder, you can see the results on a single11x17-inch graph .
In addition to extended sweep time, the 3590A/3595A combination also gives you a choice of five sweep rates (from 1 Hz to 1,000 Hz per second) and four filter bandwidths (from 10 Hz to 3,100 Hz} , an 85 dB dynamic range

over either of two frequency ranges (20 Hz to 62 kHz and 200 Hz to 620 kHz) , 3 µ.. V to 30 V sensitivity, and built-in autoranging for ease of operation.
The result is a systems-analysis tool ideally suited for work in the lower frequency ranges, with the capability to work in higher frequency ranges as well!
The 3590A Wave Analyzer mainframe is $3200 ; the new 3595A plugin with the 10,000-second sweep time is $1250. Other plug-ins available for the 3590A are : the 3592A slave and program unit, for use with a second mainframe, $80; the 3593A with 3-digit mechanical display and 620second maximum sweep time, $1100 ; and the 3594A with 5-digit electronic counter frequency display and 620second maximum sweep time , $1600.
To get complete information on the HP 3590A and the various plug-ins, contact your local HP field engineer. Or, write to Hewlett-Packard, Palo Alto , California 94304. In Europe: 1217 Meyrin-Geneva, Switzerland .

E u crR ON IC D FSIGN 11. May 24. 1970

INFORMATION RETRIEVAL NUMBER 2

HEWLETT"' PACKARD
SIGNAL ANALYZERS

Allen-Bradley Type G
variable resistors help seal Sylvania's rescue transc;eivers against
ocean dunk·ng

Built primarily for aiding in the location and recovery of downed airmen, Sylvania's emergency rescue transceiver must be reliable under extremely adverse conditions. It is lightweight and compact enough to be carried in the pocket of a flight jacket. It must withstand impact and immersion in salt water without damage.
Essential to meeting these requirements is Allen-Bradley's Type G variable resistor. It's rugged. It's compact. And it provides the necessary seal against water. This particular Type G has two "0" rings-one between the bushing and shaft, and one between the bushing and mounting panel. This dual seal prevents water entering the enclosure, as well as the control.
The Type G variable resistor features the Allen-Bradley solid,
hot-molded resistance track. It gives long life-less than 103
resistance change after 50,000 complete cycles. The noise level is extremely low, and the smooth adjustment provides virtually infinite resolution. Low inductance permits operation across a broad frequency spectrum.
For complete details and immediate delivery on this 112-inch diameter Type G 1h-watt variable resistor, call your authorized A-B industrial electronics distributor. Or write : Marketing Dept., Electronics Div., Allen -Bradley Co ., 1201 South Second Street, 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 EC69-11A

Type G variable resistor shown actual size
Sylvania AN / PRC-90 dual channel rescue transceiver permits two -way voice communication, the transmission of Morse code or the sending of a homing beacon.
m ALLEN-BRADLEY ~ QUALITY ELECTRONIC COMPONENTS

~l~ctronic Design .1.1
NEWS
21 News Scope
25 Invisible, corner-turning IR detects thieves 26 Process squeezes out wire like toothpaste
28 Army perfecting thermoelectric power for patrols
30 The 1971 wristwatch: No hands, no moving parts
32 Laser makes air visible to aircraft designers 36 Electronics scores in sports
Its applications range from spectacular computer-operated stadium scoreboards to complex motor speedway timing systems. 47 Washington Report

TECHNOLOGY
78 Liberate your FET amplifier design from tight device specifications by using this combination bias technique.
86 Design filters in minutes. Characterize performance by nondimensional ratios and calculate their values on a computer.
90 Gate your op amp-and get a powerful new device that simplifies test, control, switching and modulatioo circuitry.
96 Engineers want more challenges, according to this attitude survey. They may even change jobs because the work is elementary and boring.
103 Product Source Directory: Squarewave and Function Generators
108 Ideas for Design

PRODUCTS

117 ICs & Semiconductors: Content addressable memories tell of match or mismatch .

122 Modules & Subassemblies: D/a converter for $195 settles to 0.1 % in only 25 ns.

124 Components: Red light-emitting-diode lamp sells for just 50¢ each in quantity.

127 Instrumentation

131 Microwaves & Lasers

129 Tools & Engineering Aids

132 Data Processing

130 Packaging & Materials

148 Product Index

Departments

?7 Editorial: Lesson from Apollo: plan for contingencies

13 Designer's Calendar

135 Design Aids

44 Letters

136 Application Notes

50 Sidelights

138 New Literature

134 Evaluation Samples

146 Advertisers ' Index

Information Retrieval Service Card inside back cover

Cover: Electronic scoreboard in the San Diego Municipal Stadium designed by the Cubic Corp., San Diego.

ELECTRONIC DESIGN is published biweekly by Hayden Publishing Company, Inc., 850 Third Avenue , New York, N _Y. 10022 . James S. Mulholland, Jr.. President. Printed at Brown Pri nting Co ., Inc ., Waseca, Minn. Controlled
circulation postage paid at Waseca, Minn., and New York, N .Y. Copyright © 1970, Hayden Publishing Company ,
Inc. 81 ,801 copies this issue.

~ INFORMATION RETRIEVAL NUMBER 3

Decimals: Autopoint and scientific notation.
Automatic entry of e and 7r.
Ten directly addressable storage registers
Programming : Up to 128 steps. Conditional
branching and automatic entry of programs with card reader.

Model 1655. Size: 13" x 13V2" x 6W'.
Announcing an important breakthrough for engineers and scientists. Calculators based on the latest MOS/LSI technology. In both printing and display models. Available in over 350 cities coast to coast
Supported by more than 3,300

ELECTRON IC D ESIGN 11 , M ay 24, 197 0

Dynamic range: 10- 99 to 10+99

Automatic special functions:

;cos- ax, Log 1ofloQe, SIN/COS,

S1N- 1

1 xi 1

'IX t

Radians to Degrees,

Single key lx, lx2, N,

Rectangular to Polar Conversion.

Just plug in and put it to work.

Weight: Twelve pounds.

sales and service technicians.

Monroe men who know everything

there is to know about calculators.

Because calculators are our only business.

That's how we got our name.

Monroe. The Calculator Company

A DIVISION OF LITTON INDUSTRIES
550 Central Avenue. Orange, New Jersey 07050

INFORMATION RETRIEVAL NUMBER 4

E u CTRO IC D ES IG I I, May 24. 197 0

Q When you need a high-performance operational · amplifier that combines low input current and high

slew rate, and is internally compensated, what's

A your first choice?

MC1556G

· · 2.0 nA (max) input offset current.

· I5.0 nA (max) input bias current.

· 4.0 mV (max) input offset voltage.

· 40 kHz (typ) Power Bandwidth

· 2.5V/µS (typ)[UnityGa.in]slew rate .

Q Suppose you want to avoid cascading packages and · have some rather severe economic restrictions in addition to high-performance specifications. Obviously, a dual op amp is the answer. What's your best bet? A The NEW MC1558G/MC1458G · · Internal frequency compensation.
· Short-Circuit protection.
· Dual MCI 74I · · Only $4.50 (100-up) MCI458 G

Q When your design·calls for an op amp with maxi· mum slew-rate capability plus other high-perfor-
mance characteristics; and, a hermetiC package at
a realistic cost, what would you choose?
A MC1539/MC1439G · · Slew Rate - 34 VI µS (typ) at Av= IOO
· Class AB output for excellent linearity.
· 20V p-p output swing at 10 kHz (min).
· 2.0 mV (typ) input offset voltage.

Q What is the "industry-standard'', general-purpose · op amp? Probably, the one that has been specified more often than any other. A MC1709/MC1709C · · I 50 ohms (typ) output impedance. · Large output-voltage swing.
Low Temperature drift.
· High open-loop gain.

Q What's the best all-around, internally-compensated, ·general-purpose op amp available today? Hint: Same pin configuration as the MC1709. A MC1741/MC1741C · · Offset voltage-null capability.
· Wide common-mode and differential voltage ranges.
· Low-power consumption.
· No latch-up problems.

Q If none of these op amps fit your specific applica· tion, what do you do next? A Select one of the others from Motorola's · "broadest of all" op amp lineup:
MC1520
differential output/ wide bandwidth
MC1530/1430
uncompensated
MC1531 /1431

low input currents
MC1533/1433

Vio adjustable
MC1535/1435

Q For optimum economy - where high gain is re· quired with excellent stability - what's your ideal

op amp choice?

r-----,

A MC1437

· · Two op amps on one chip (Dual MCI709) - for very little
more than the cost of one.

· I' L _____ JI

· High-performance open-loop gain.
· Low temperature drift.

Dual Op Amp
MC1712
Wide Bandwidth
If you scored l 00% , it's probable that you are already benefitting from Motorola's wide range of op amp types. If not, you should write for our Application Selector Guide - to P.O. Box 20912, Phoenix, Arizona 85036.
We may ask more questions, later!

v -wwfkp~~t4aau! ~MOTOROLA INTEGRATED CIRCUITS

INFORMATION RETRIEVAL NUMBER 5

INFORMATION RETRIEVAL NUMBER 6 ...

the decade and its capability

1969 Application of the versatile Veeder · ~eca.de i.s limited only by the designer's · 1maginat1on, and .. .
you'll find that its tremendous flexibility produces everwidening vistas of possibility. A module that's easily stacked into a compact, multi-digit counter package, the Decade is the ideal unit for high-speed count accumulation , storage and transfer in data processing , control equipment systems, and ... well, about the only thing we can't count is the number of applications for this unique product. The Series 1969 is a single wheel electric counter with electric read-out (BCD or decimal) , transfer and reset , and 2400 cpm speed. It combines large figure readability with

narrow width for space economy. Another Decade model, the Series 7266, offers wheel configurations for recording time and counting dozens and denominations of money. The 1969 is only one of the many performers in VeederRoot's total capability lineup of counting, recording, and controlling instruments-mechanical, electrical, electronic. For information about our complete line, write: Veeder-Root, 70 Sargeant St., Hartford, Conn . 06102 . (203) 527-7201 .
,:.1 _v_e_e_o_e_R_-_R_o_o_T_ _ _ _
INNOVATORS IN NUMERICS : COUNTING/RECORDING / CONTROLLING

V··d.er- Ront Wn,.1..t .Wi..t· · .&ra·ntina· R11·nn<. Air·<-. Audrali,. · MP.lbnurn·. Brazil: Sao Paulo. Emrland : New Addin1Zton . Surrey. Scotland : Dundee · West Germany: Neuhausen/Filder ·Canada : Toronto

General Electric helps you solve the tough ones

GE has the broadest line of electronic components in the industry. From the tiniest integrated circuits to powerful high performance motors, GE components help you solve your tough problems . . . in design, in performance, in economy. Take a look at these GE problem solvers.
General Electric delivers 19 new epoxy T0-18 transistors for demanding applications. GE 's encapsulated devices are performance-proved, reliable. And they cost less than metal-case devices. The new epoxy transistors include PNP types , PNP/NPN complementary pairs, and low level amplifiers. They offer breakdown voltages as high as 60V with excellent beta linearity and dissipate up to 500 mW. They handle collector currents up to 1 amp. Get spec sheets on GE 's new epo xy transistor lineup. Circle number 2 11.
GE meter relays put accurate dependability into critical new medical systems. A new heartbeat monitor, for instance, uses GE meter relays to indicate the heart beat visually. And they have the added capability to sound an alarm when preset limits are reached.

Either the easy-reading BIG LOOK® or the low profile HORIZON LINE® styles feature solid state control for precise accuracy. Put GE dependability into your critical circuits. Circle 212 for details.
Forget capacitor leakage problems with GE military-type tantalum wet slugs. The special GE design incorporates a double elastomer seal that maintains performance even through the 35 temperature cycles requ ired by MIL-C-3965E. And life tests show a capacitance change of less than 5% in 2000 hours operation. GE wet slugs come in 4 case sizes for applications up to 125 volts de; 1.7 to 1200 µf. GE 's 20 years expe rience is your assurance of dependability. For complete information, circl e 213.
GE Microwave Circuit Modules save up to 60% in size and weight for critical communications and radar systems. GE MGM 's may be used as oscillators, amplifiers, multipliers, detectors, mixers, integrated isolators and circulators. And they are extremely stable even in adverse environments.

The GE C-2003E , for example, is used in pulsed transponder applications. It operates dependably from
+ - 54 to 125C and withstands vibra-
tions at 15G from 20 to 500 Hz. Frequency stability is ± 3MHz with minimum life of 500 hours operation. Get GE 's MCM cata log. Circle 214.
New magnetic material gives 6% increase in residual flux density ... resists demagnetization. GE 's new Alnico BC was developed for applications requmng high resistance to demagnetization plus a higher flux output than other Alnic.o 8 alloys. Alnico BC is the latest development in GE 's complete line of Alnico permanent magnets. It's another example of the technical expertise you get when you specify General Electric to solve your magnet problems. For details on the entire GE Alnico family circle 215.
Get more capacitance In less space with GE computer-grade capacitors. These aluminum electrolytic units deliver up to 540,000 µf at 5 VDC (34,000 µf at 100 volts) . . . highest capacitance per case size available. They are rated for continuous duty at 65C or at SSC

with the broadest line of electronic components

with proper voltage derating. GE computer grades feature high
ripple current capability with low equivalent series resistance . Nine case sizes are available. Circle 216.

Rechargeable GE nickelcadmium batteries give you longer operating life. Proved GE reliability puts longer battery power into your application at an economical price. Nominal ratings range from 0.1 amphours to 4.0 amp-hours in sealed cells and up to 160 amp-hours in vented types at the one-hour rate. Put dependable GE power in your circuit. Circle reader card number 217.

Programmable UJT lets

you control the key

parameters with just two resistors.

That's right. You control 71, Ras, Ip and

Iv so that you design your own unijunc-

tion as you design the circuit.

Low leakage and peak point currents

make GE 's D13T programmable UJT a

natural for long interval timers. High

breakdown voltages, fast trigger pulsing

and low voltage operation add versa-

tility. And the plastic T0-98 case helps

solve economy problems. Get full de-

tails. Circle number 218.

Let General Electric help solve your component problems. Call your nearest Elec-

tronic Components Sales Operation Office. Or check with one of the many author-

ized GE distributors. P.S. Problems? General Electric has solutions.

2s5-64

GENERAL. ELECTRIC

INTRODUCING NEW RCA SUPERSWITCH:

THE NEW CA3062

$2.95 (1000-UNIT LEVEL)

Choose any medium-speed application that uses a light sensor. You'll find the circuitry easier to design when you use the RCA-CA3062- because there's less to design. The CA3062 consists of two parallel-connected photosensitive Darlington pairs which drive a differential power amplifier to provide a normally-off and a normally-on output in response to a light input. Turn-on time is typically 38 µs. Turn-off time is 43 µs.
Available in a compact, window-ended T0-5 style package, the CA3062 has 100 mA output current capability, and can be operated at supply voltages in the

I
range of 5 to 15 volts de. It is compatible with RCA's 40736R infrared emitter. Use it for counter and position sensors, optical tachometers, limit' detectors, level scanners, paper web sensors, wheel balancers, and similar devices.
For further details, see your local RCA Representative or your RCA Distributor. For technical bulletin, File No. 421, write: RCA Electronic Components, Commer-
cial Engineering, Section E52-2/CA26, Harrison, N. J.
07029. In Europe: RCA International Marketing S.A., 2-4 rue du Lievre, 1227 Geneva, Switzerland.

INFORMATION RETRIEVAL NUMBER 8

INFORMATION RETRIEVAL NUMBER 9 ~

Heads: You win.

Tails: You win again.

Elco rack-and-panel connectors give you a better head start.

And a choice of tails.

The head start is the connecting end of an Elco connector: the patented VariconTM contact that fully meets the requirements of MIL-E-5400. The four mating surfaces of this unique contact are coined to an exceptional hardness and wipe clean with each make. Once the contacts are joined, the inherent springiness of the gold/ nickel-plated phosphor bronze and the fork-like design make a superior, gastight fit.
Because the contacts are free floating, they align perfectly. A few contacts or 100 or more, all fit precisely together every time, over a long service life. There's no contact chatter. Nobody else gives you a contact head quite like the Varicon.
And nobody else gives you the choice of tails you get with Varicon. You can wire-wrap, crimp, clip, stake, or solder them. Whatever terminating technique or combination of techniques your assembly lines are set up for, we'll furnish the appropriate tail. If staking or crimping is your style, we

·· I

.078" Taper Tab

1· #

Solder/ .098" Taper Tab

= .·
Wire Wrap Tail .024" x .050" x .567"
= .·
Wire Wrap Tail
.024" x .050" x .760"
= ...
Crimp (Loose contact)

can supply the equipment too. Manual

or automatic. Purchase or lease.

Elco rack-and-panel connectors

come in standard rectangular models,

or as miniature connectors, or in

modular units. You can have them

with 2 Varicon contacts, or up to 140,

or anything in between.

In short, our line of Varicon rack-

and-panel connectors has a lot going

for it. Except price. Though it's a

precision component, the Varicon

contact is easily produced in high

speed progressive dies. There's no

expensive machining, no waste. When

you can turn out millions of Varicons

a week, you don't have to charge a

fortune for them.

There's a lot more to be told about

Varicon connectors. It's all in our 28-

page rack-and-panel connector guide,

and we'll be happy to send you a copy.

Just write, wire, call, or TWX us.

Elco Corporation, Willow Grove,

Pa. 19090.

~·-

(215) 659-7000. . ~

TWX 510-665-5573. ~-~ -

E iCQ 1

Rack-and-Panel

L...:

Connectors

When you want radar as pure and coherent as a laser beam ...

Symbolic electronic signal undistorted by EMI photographed by Howard Sochurek

bring ERIE in early.
31 ,000 feet ... heavy traffic . .. ugly weather over the Plains . This isn't the time for "noise" In the radar. But, no sweat! RCA's exciting new AVQ-30X Weather Radar is up front, sweeping the sky ... protected from EMI by 39 specia l ERIE filters. No other airborne radar has ever approached the single or dual system reliability of the AVQ-30. From the start, RCA l:las called on the outstanding research and component capability of ERIE TECHNOLOGICAL to help in the development of this great new unit. Proof, once again, that it pays to bring ERIE in early.
INFORMATION RETRIEVAL NUMBER 10

ERIE TECHNOLOGICAL PRODUCTS, INC.
644 West 12th Street, Erie, Pennsylvania 16512 (814) 456-8592

Designer's Calendar

When You Buy a Power Supply, Why Not Get the Best?

JUNE 1970

I-

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

1
For further information on meetings, use Information Retrieval Card.

June 24-26 Joint Automatic Control Conference (Atlanta, Ga.) Sponsors: IEEE, et al. D. Lyons, Dept. of Textile Science, Clemson Univ., Clemson, S. C. 29631.
CIRCLE NO . 447
June 28-July 1 Consumer Electronics Show (New York City) . Sponsor: Electronic Industries Association. Jack Wayman, EIA, Consumer Products Div., 2001 Eye St., N. W., Washington, D. C. 20006.
CIRCLE NO. 448

JULY 1970

f--

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
July 14-16 International Electromagnetic Compatibility Symposium (Anaheim, Calif.) Sponsor: IEEE. Jim Senn, Lectro Magnetics, Inc., 6056 W. Jefferson Blvd., Los Angeles, Calif. 90016.

CIRCLE NO. 449

July 21-23 Conference on Nuclear & Space Radiation Elfects (San Diego, Calif.) Sponsor: IEEE. Richard Thatcher, Battelle Memorial Inst., 505 King Ave., Columbus, Ohio 43201.
CIRCLE NO. 450

E L ECTRONIC DESIGN 11, M ay 24, 1970

Ml , ..,I H ""'

'.' t l'IHll ~-·\

~H , ·.· 1tH

~. ~· 1 ' ...... 'i

J(l

..,1. ,, ....... ..,,. 11 I 1-A... <,1! -..!'> ..,.\, ~ J\ C.I

II' ' ' \·~ 1 · , 11~: ·
·:.\~ ·l·~~I 'I '.,V q 1·,1

1V'o' I''. '., I\<

-..n '.H" '·I H
\H , l'l\WI N) M ft, ..10011 .... l'I I JfA,t.!
""'"I '!"M ·
11'\I U 1 Pt.f fl l'I'>' t
·,,t,r Ii""' 1, ·,ff·
1~1 1"1,f ·1

f·\1fl·, ~:.\ ·

MrG
~.lfc; ~MC;

S~'f NO PAR I ' 0 ~V)Of l

' Pl,T 'P· '\ t';f

INPlil HIA'\Sff'l.jl'\ t('\t 1-.. rur HR'.1 +

Lll.TPL:l

'~·

I P'!o

.!;

V 1lf1lol TfMM .._

l\Hu. fl;.q TU."fl ; ·.,;r l ... i· T ii_

01 Sf
M·, "~ 1,·,,,.,f

BLID-27.6A (I 09,890 Hrs .)

U2DS-22A (73,585 Hrs.)

53D-115A-400 (6I ,387 Hrs.)

Abbott's New Family of 100°C Units-

are designed to operate in t~e stringent environment required by military and aerospace systems - (per MIL-E-5400 or MIL-E-5272C)
from - 54 °C to + 100 °C.
RELIABILITY - MTBF (mean time between failures) as calculated in the MIL-HDBK-217 handbook can be expected in excess of 50,000 hours at 100°C for many of our power modules. The hours listed under the photos above are the MTBF figures for each of the models shown. Additional information on typical MTBF's for our other models can be obtained by phoning or writing to us at the address below.
QUALITY CONTROL - High reliability can only be obtained through high quality control. Only the highest quality components are used in the construction of the Abbott power module. Each unit is tested no less than 41 times as it passes through our factory during fabrication tests which include the scrutinizing of the power module and all of its
Please write for your FREE copy of this new catalog or see EEM (1968-69 ELECTRONIC ENGINEERS MASTER Directory), Pages 1727 to 1740.
,.,.#.881 t r a n s I s to r

component parts by our experienced inspectors.
NEW CATALOG - Useful data is contained in the new Abbott Catalog. It includes a discussion of thermal considerations using heat sinks and air convection, a description of optional features such as short circuit protection and remote output adjustment as well as operating hints for power supplies and a listing of environmental testing costs.
WIDE RANGE OF OUTPUTS - The Abbott line of power modules includes output voltages from 5.0 volts DC to I0,000 volts DC with output currents from 2 milliamperes to 20 amperes. Over 3000 models are listed with prices in the new Abbott Catalog with various inputs:
60~ to DC, Regulated 400~ to DC, Regulated 28 VDC to DC, Regulated
28 voe to 400£ti, 1cp or 3cp
60£t, to 400'\:7, 1cp or 3cp
TO: Abbott Transistor Labs., Inc., Dept. 67 5200 West Jefferson Blvd. Los Angeles, California 90016
Sir: Please send me your latest catalog on power supply modules:
NAME _ _ _ _ _ _ _ DEPT. - -
COMPANY---- - - - - -

LABORATORIES , INCORPORATED

5200 W. Jefferson Blvd./ Los Angeles 90016

(213) WEbster 6°8185

Cable ABTLABS

ADDRESS - - - - - - - - CITY & STATE - - - - - - - -

INFORMATION RETRIEVAL NUMBER 11
13

This is the fastest printer around.

It also produces both alphanumerics and graphics.

And printout is 132 columns
wide on an 11x8-1/2 format! The practical continuous
speed of the standard line printer is 600 lines per minute. But the new Gould
4800-11 will deliver 4800 lines per minute. And it'll produce both
alphanumerics and graphics simultaneously - directly from any source
of digital input as data transmission by telemetry, radio microwave, and/or land line. There's a new character
generator, too. With an ultimate capability of three 128 character fonts with dot
matrices up to 15 x 15.* And because it has a 132 character buffer, you ·don't have to burden your computer's memory
banks. The input control lines are built-in, too. Which makes it
comparatively simple to interface the 4800 with almost any
computer you have in mind. The 4800 provides
programmed control for a

variety of output forms ... line and letter spacing, paragraphing, columns and so forth. Plus a convenient capability to translate bit mode input into generalized graphics. But speed and versatility are just part of our story. Because it's electrostatic, the 4800 is infinitely quieter than line printers. Because it has fewer moving parts, it's more reliable. And because it's a lot simpler, it's priced well below printers that can't come close to the performance. So there you have it: the Gould 4800 electrostatic hardcopy printer. Isn't it time we talked? Graphics Division, Gould Inc., 3631 Perkins Avenue, Cleveland, Ohio 44114. *Supplied standard with unit: One 64 character font with 5 x 7 dot matrix.
GOULD CLEVITE
The Gould 4800. The next generation of high-speed printers.

INFORMATION RETRIEVAL NUMBER 12

1511 SERIES
Max. av. forward current at 120° C420 Amperes
Surge overload rating , 1 cycle6000 Amperes
Controlled Avalanche Voltage-12503500 Volts

A significant advance in silicon rectifier power handling capacity
3 new series of silicon rectifiers from Tung-Sol permit designers to meet extremely high power requirements.
· Reverse voltage ratings to 5000 Volts
· Average forward current to 500 Amperes · Surge overload ratings up to 8500 Amperes Controlled avalanche characteristics provide transient handling capability that results in increased reliab ility. All units feature ceram ic-to-metal seals, mount in any position and are supplied in either polarity.

1621 SERIES
Max. av. forward current at 120° C500 Amperes
Surge overload rating, 1 cycle8500 Amperes
Controlled Avalanche Voltage-11002300 Volts

1611 SERIES
Max. av. forward current at 120° C470 Amperes
Surge overlo ad rating , 1 cycle5200 Amperes
Controlled Avalan che Voltage- 26005000 Volts

Write for technical data bulletins-
Tung-Sol Division, Wagner Electric Corporation 630 West Mt. Pleasant Ave., Livingston, N.J. 07039 Twx : 710-994-4865 ·Phone: (201) 992-1100; (212) 732-5426

TUNG-SOL

High Power Silicon Rectifiers

Tra demark TUN G-S OL Reg . U. S. Pat . Off . and Marcas Registradas

INFORMATION RETRIEVAL NUMBER 13

ELECTRONIC DESIGN 11 , May 24, 1970

We've just advanced the Q-meter 17 years.

For lab and production-line work, our

new Model 4342A Q-meter measures Q

faster and easier than its classic

predecessor, HP's Boonton 260A.

It measures Q values from 5 to 1000

in a frequency range of 22 kHz

to 70 MHz.

· Automatic leveling of oscillator

source eliminates need for Q-Multiplier

controls.

Speedy GO/ NO-GO selector reduces

component testing time.

High impedance voltmeter virtually

eliminates frequent zero reset. New solid-state circuitry eliminates
unreliable thermocouple. Pushbutton controls give fast
frequency and Q range switching. All this means shorter measurement
time and a big boost for high-volume testing and lab use.
It's versatile, too. You can detect extremely small changes in Q . Or measure coil, capacitor and resistor parameters. And the price? Just $1500.
Okay. You want to measure up to

peak production. Dial your nearby Hewlett-Packard field engineer. He'll give you all the specs on HP's newest Q-meter in 17 years. Or write: Hewlett-Packard, Palo Alto, California 94304; Europe: 1217 Meyrin-Geneva, Switzerland.
HEWLETT" ' PACKARD
IMPEDANCE INSTRUMENTS
18002

... want a tantalum capacitor with proven performance?

Buy TYPE 1500 TANTALEX® SOLID-ELECTROLYTE CAPACITORS

INFORMATION RETRIEVAL NUMBER 884

· Hermetically-sealed in metal cases · Four case sizes, ranging from
*" 1,1,i" to length · Value-packed performance characteristics-
low impedances at high frequencies, low dissipation factor, minimal
capacitance drift with temperature, practically no change in
capacitance with life · Low leakage current limits · New higher
capacitance ratings · Request Engineering Bulletin 3520F

4SC-9144R3

Now...new, lower capacitance values!

Type 192P PACER® FILMITE® 'E' CAPACITORS

INFORMATION RETRIEVAL NUMBER 885

· Low-cost film capacitors with one-third the size of conventional tubulars · Eight new low-capacitance values (100 pF thru 390 pF @ 200V) added to broad range of standard ratings · Special construction-extended foil sections terminated in metal end caps, assuring positive contact with every turn of the electrodes · End caps are also effective moisture barriers · Entire assembly protected by special sleeve of high dielectric strength · Request Engineering Bulletin 2066B

For Engineering Bulletins as noted above, write to: Technical Literature Service, Sprague Electric Co., 347 Marshall Street, North Adams, Massachusetts 01247.

4 SC·0105 Rl
SPRAGUE®

THE BROAD-LINE PRODUCER OF ELECTRONIC PARTS

THE MARK OF RELIABILITY
'Sp ra1ue' and · @ · are re11 st er ed tra demar ks o l th e Spr11ue [lectm: Co

ELECTRO IC DFSIGN 11 . May 24. 1970

HiDhliDhling THE ISSUE

Are you bored with engineering'! Are you in favor of an engineer·ing union? Would you change your job title to match the work you do? How much more money do you think you should be earning? How much responsibility do you think your employer should assume for your continued education in technology? ELECTRONIC DESIGN has answers to these questions and many others as the result of a management survey conducted among a random sampling of 1000 of the magazine's s ub sc r i b e r s . Page 96

Electronic aids are infiltrating the world of sports-from spectator events like football and horse racing to field and stream activities like fishing and dog training. The most spectacular are the huge stadium scoreboards, ranging from a $600,000 computer-operated animated football ,scoreboard for the San Diego Municipal Stadium (see cover photo ) to a new $4-million system now being installed at the Ontario (Calif. ) Motor Speedway.
In addition, electronic timing systems have either completely taken over or are being used as backups in many sporting events. Page 36

Two new monolithic arrays form a unique family of memory products known as content addressable memories (CAMs).
In content addressable memories data can be associated. That is any data placed at the input of the memory is matched against the memory's stored data. The memory responds with a match or mismatch answer.
With these two new CAMs, data can be written into them just like any other read-write memory and they then provide the association of input to stored data. Page 117

ELECTRONIC DESIGN 11, May 24, 1970

Why Ragen Semiconductor tests C/MOS with a Teradyne J259

When you're testing complementary-MOS devices with twoorthree hundred transistors on a chip, you'd better be sure of your test equipment. Ragen Semiconductor, an acknowledged leader in C/MOS,has good reason to believe in its computer-operated test system: With thousands of C/MOS IC's tested and shipped, returns have been virtually nil.

He might also tell you some things the J259 doesn't do.
It doesn't force you to stop produc.tion once a week for recalibration adjustments.
RESET

oC
c

It doesn't break down every time

someone insults it. Ragen'sJ259down-

time has been less than one percent.

It doesn't leave you high and dry

when your test load changes. When you

expand, it expands, through the easy

addition of multiplexers, magnetic-

tape units, line printers, and all the soft-

ware you need to go with them.

Ragen's test system? A Teradyne J259.
Ask Ragen President Al Medwin what he likes about his J259 and he may tell you that its high-impedance measurement system is perfect for the low-current measurements he has to make. Or he may tell you about the strong software Teradyne supplies with its systems. He may well mention speed because each Ragen device sees 450 parametric tests almost as soon as it's placed in the test socket.

The J259 makes sense to Ragen Semiconductor. If you're in the business of testing circuits- integrated or otherwise- it makes sense to find out more about Teradyne computer-operated test systems. Just use the reader service card or write Teradyne, 183 Essex St., Boston, Mass. 02111.

Teradyne makes sense.
INFORMATION RETRIEVAL NUMBER 16

News scone

Mini-machines and mini-firms

marked this year's SJCC

Minicomputers, min ico m p u t -

er peripherals, and graphic termi-

nals were conspicuous among ex-

hibits at the 1970 Spring Joint

Computer Conference held in At-

lantic City, May 5-7. Inexpensive

digital cassette tape recorders and

magnetic disc;'I were also well repre-

sented .

Exh ib itors, too, showed a trend

t o the sma ll in s ize, according to

David T . O'Brien, district manager

of General Automation,. Inc., Ana-

heim, Calif.

" The small people," he said,

"gain credibility from attending

shows. They can demonstrate to a

dubious customer t hat they do, in

fact, have working hardware avail-

able. The large companies have

made t hei r mark and their show

expendit ures are not returned in

increased sales."

Some 360 exh ibitors displayed

computer hardware in 980 booths

at Convent ion H all. Among the

missing were several manufactur-

ers of large comp uters: CDC, XDS

and Burroughs, for example. And

software houses were not as heavi-

ly represented as in t he past.

An informal survey of exhibitors

showed t hat about 40% of those

making inquiries at the booths were

fr om upper levels of management

or engineering management. About

20 % were computer professionals

-engineers and programmers. Fif-

teen to 20% were university affili-

ated, and some of the remainder

were interested in investing oppor-

t unities.

The usual technical recruiting

associated with trade shows was

evident at t he SJCC although at a

much reduced rate. Two reasons for

this were offered by Dick Wana-

maker, who was managing the Ca-

reer Center.

Wanamaker said, "The job seek-

ers are not here in Atlantic City

because it is relatively remote, and

the jobs are not being offered by the employers." H e added, "The market fo1; computer professionals has only recently begun to soften. Large companies are now recruiting on a corporation-wide basis instead of the division basis in the past."
Wanamaker had another comment on today's applicants. He said, "They are waiting for agencies to call-they are not dropping in to look for jobs . They were spoiled by the booming demand for their skills in t he past."
Some 27,000 attendees paid registration fees of $20 for sponsor AFIPS (American Federation of Information Processing Societies) members, and $40 for non members. The previous $5 ticket for admission to exhibits only was not offered, thus making attendance comparisons to past joint computer conferences inconclusive.
Growing market seen for test equipment
The $260-million-a-year Government market for automatic test and checkout equipment wi ll double by 1975, Frost & Sullivan predicts.
The New York market-research company also forecasts that noncomputerized systems for testing and checkout, now a $490-million-ayear Government market, wi ll stay the same.
The biggest buys in automatic equipment will be to support aircraft, Frost & Sullivan reports. The B-1 manned strategic aircraft system will have a central, integrated test system as part of its avionics package. The Air Force's F-15 fighter plane will require from 15 to 20 field shops to maintain it, with $50-million worth of electronics in the shops.
The Army will buy automated

equipment for the field to red uce personnel. The Navy, which also wants to reduce personnel, needs automated systems on board a ship -not only electronic equipment but everything that operates.
Eventually, the Frost & Su ll ivan report says, built-in test equipment will monitor each subsystem so it can be repaired with redundant components when something breaks down. The bui lt-in equipment represents only 5% of the market now, but is expected to build up substantially by 1980. Built-in monitoring units for the space agency are expected sooner.
The findings, presented in a 175page report, are available for $245 a copy from Frost & Su ll ivan, 106 Fulton St., New York City.
New ceramic promises to be useful in devices
Practical devices made of ferroelectric ceramics may soon be available, according to two technical papers, presented at last month's meeting of the American Ceramic Society in Philadelphia.
The peculiar electro-optic properties of ferro-electric ceramics have been studied for several years, but their application to specific devices, such as information storage and display systems, has been limited by materials problems.
An improved electro-optic ceramic material-lead lanthanum zirconate titanate (PLZT)-discovered at Sandia Laboratories, Albuquerque, N.M., was described at the Philadelphia meeting by a Sandia researcher, Cecil E. Land.
The ceramic differs from earlier materials in that it is more transparent, producing black-white con trasts of as much as 1000-to-1 and a complete range of colors.
In optical ferro-electric ceramics, voltage is applied across a portion of the plate to establish an electrical polarization vector and align (pole ) minute dipoles within the material along this vector. Polarized light directed at the plate is modified as it passes through the ceramic, the degree of modification varying according to the wavelength of the light. The ceramic therefore separates colors much like a prism.
These optical effects remain even

ELECTRON IC DES IGN I I. May 24, 1970

News
SCOP8coNTtNUED
after the electrical field is removed, giving the material a true "memor.y" capability. The image display may also be viewed directly or projected like a photographic slide.
The second paper, by A. H. Meitzler of Bell Telephone Laboratories, Murray Hill, N.J., described a number of experimental imagestorage and display devices using fine-grain ferro-electric ceramics. Thin plates of lead zirconate-lead titanate in combination with transparent conductive and photoconductive films, are used to form device structures capable of storing high-contrast images under the control of electrical voltages.
Meitzler said that experimental devices had demonstrated a resolution of about 50 lines/ mm in 50 µ,m thick ceramic material and had been able to hold the image with no apparent change fo1: several months.
Motorola optimistic about MOS and ECL
"One-half of the ICs used in 1975 will be either MOS memory or ECL devices," according to Milton Laflen, group manager of digital IC product marketing for Motorola Semiconductor Products, Inc.
Speaking at a Motorola seminar on digital ICs, the Phoenix engineer said that emitter-coupled logic would be attractive to designers because of its high speed, while complementary MOS would offer low-power operation. Laflen saw the TTL market continuing to grow until 1972 or 1973, when he expects it to level off at high continued usage.
Another Motorola expert, Michael Callahan, agreed that MOS and ECL were headed for major growth. Callahan, who is operations manager for IC research and development ·in Phoenix, said that any semiconductor concern that wanted to be a leader would have to be involved in at least nine tech-

nologies. He listed them as follows: complementary MOS, silicon-gate technology, high-frequency bipolar circuits, multilayer metalization, beam-leaded chips, beam-lead laminates, computer-aided design, radiation hardening, and fusible-link RO Ms.
Callahan said that future MOS products would have to be lowthreshold circuits to be successful. Complementary MOS will give very low quiescent power dissipation, a feature much appreciated by designers, the researcher said, and the silicon-gate technology will yield smaller devices, lower Millereffect capacitance and higher frequency of operation.
"Multilayer metal will be invaluable in random logic," Callahan said, "where interconnection layout problems are most difficult." And computer aids will be mandatory. "Any vendor that is not willing to invest in CAD will not be in a leadership position in the semiconductor industry of the future," he said.
Callahan predicted that fusiblelink ROMs-which are programmed easily by the customer-would offer an easy way around the problem of system design errors. "System designers often make errors," he said, "and are faced with a three-month wait for new ROMs if a mask change is neecssary. The new programmable ROMs will make changes in memory programming easy."
And, surprisingly, the IC R&D expert saw a good future for the old RTL logic. "Motorola will introduce new RTL products in 1970," he said.
Laser radar to pinpoint details of moon's surface
Accurate mapping of the moon's topology from a spacecraft will be possible for the first time with a pulsed ruby-laser radar altimeter that measures altitude to within 6.6 feet at 60 nautical miles. The laser transmitter produces a 10-ns, 2-MW peak value. The system, being designed by RCA Aerospace Systems Burlington, Mass., under a $1.7 million NASA contract, is
a special version of RCA's ANI
GVS-1 portable Army range finder. Measurements of the moon's sur-

face using the new altimeter will be made from the orbiting Apollo 16 command and service module.
British urged to merge computer software firms
Within a few years, the expenditure in Britain on software wi ll be twice that of hardware, according to Dr. Ernest Davies, Joint Parliamentary Secretary to Britain's Ministry of Technology.
In addressing the Computer Services and Bureaux Association in London last month, Davies stated that the computer software industry "could be strengthened by some grouping together of software houses to create more viable organizations."
The Ministry of Technology has been responsible for implementing a number of mergers of British firms over the past three years.
Last year in Britain the cost of software was $72 million while the hardware was worth $77 mi ll ion.
Canon and Tl develop LSI pocket calculator
A battery-powered calculator, appropriately called "Pocketronic,"
has been unveiled by Canon, Inc.
Aimed for the mass consumer market, the calculator evolved from a joint development program between Canon and Texas Instruments. MOS/ LSI helped achieve the small size-4 by 8-3/16 by 1-15/ 16 inches. The unit weighs 1.8 pounds.
The calculator will be available for sale in Japan later this yeax, and in the U. S. in January, 1971. Initially, prices are expected to be under $400, with production starting at 10,000 units per month. Eventually, it is rumored, the price may drop to $100 .
The Pocketronic performs a full range of addition, subtraction, multiplication, division, credit balance and other manipulations of numbers as large as 12 digits.
All calculations are performed by three LSI chips built by TI. Total logic complexity for the three chips is 371 gates (with an average of 4.2 inputs per gate), 203 shift-register bits, and 10 flipflops. A paper tape is used to provide the readout for the calculator.

INFORMATI ON RETRIEVAL NUMBER 15 ....

Introducing Potter & Brumfield's unique
dual thin-line
dry reed relays

An entirely new magnetic structure makes possible an exceptionally low seated height of only 0.275 inch for high density board packaging. Circuit boards employing JDT relays may be spaced on 0.5 inch centers.
This design minimizes magnetic flux dispersion, resulting in a very efficient magnetic circuit. This decreases coil power requirements and often permits direct operation of JDT relays 'in low-power semi-conductor logic circuits. An interfacing am plifier may be eliminated in many applications~
Terminals are similar to those on IC packages, permitting spot testing on either side of a circuit board. The dual in-line terminals on 0.1 inch centers simplify circuit board design. The reed switches are rated at 10 watts maximum resistive (50V or 0.5A DC maximum) switching.
Mounted height is only 0.275"
Power requirements: only 75mw per pole
Combinations of Forms A, B and C are available
Single Lot Prices: JOT 4000 Series (4-pole) $ 7.65 JOT 8000 Series (8-pole) $12.95
Quantity discounts apply.

A solid state time delay circuit may be incorporated in this small package. Or a Darlington amplifier can be included to compensate for low current applications. However, the number of available poles for switching is reduced by the addition of either of these circuits.
The JDT is completely encapsulated in epoxy, giving protection against environmental contamination. The Series is presently available in many combinations of Forms of A, Band C.
···
Get full information today by calling your local P&B representative or call direct to Potter & Brumfield Division of American Machine& Foundry Company, Princeton, Indiana . 812-385-5251.

..- --- ~.e:-r-u""",_.-..e,., ·
~==":w,... )g.

. ,

POTTER &BRUMFIELD
Check 15

The seven day glitch killer

Every seven days we put another run of new Fluke digital voltmeters in the Fluke " hot box. " Here, by continuously cycling the input voltage and " baking in " the instrument at 122° F, we catch the glitches and bugs caused by long term operation in a hot environment.
The " seven day glitch killer" is, of course, only one of the many check-out steps we go through. We control the critical parts by manufacturing all of our own resistors and printed circuit boards and by 100 percent dynamic testing of all active components.
Further, the new Fluke DVM 's are designed from the ground up to give you long trouble-free life, low maintenance, and outstanding technical performance. For instance, the Model 8300A has only one-fifth as many components as comparable DVM 's. And it's built to work in an 80 percent relative humidity.
In other words, the glitches go before you get the instrument. Another typical Fluke trick.

Model 8100A 0.02% Digital Multimeter with complete portability for only $695.

..-:... ...... -.

~· ·

- ···h

-----· c r

- - - - c.

Model 8300A Digital Voltmeter with total built-in systems capability for only $1295.

IFLUKEI
..........................®

Fluke, Box 7428, Seattle, Washington 98133. Phone: (206) 774-2211 . TWX : 910-449-2850/ ln Europe, address Fluke Nederland (N.V.), P. O. Box 5053, Tilburg , Holland . Phone : (04250) 70130. Telex : 884-50237/ In the U. K., address Fluke International Corp., Garnett Close, Watford, WD2 4TT. Phone : Watford, 27769. Telex: 934583.

INFORMATION RETRIEVAL NUMBER 17

EU:CT RO IC DESIGN J I , May 24, J970

NEWS

Invisible, corner-turning IR detects thieves

Sol~d-state_ laser sy~tem employs repeaters to ring an mdustnal area with a beam-for miles, if needed

systems is redu ced. Bri ef in terruptions of t he beam
ca used by b irds or leaves do not

Jim McDermott East Coast Editor
Infra r ed-laser r epeaters t hat can project a n inv isible bea m aro und a corner and spot a b u l'glar befo re he gets to wor k a re makin g it hi ghly unlikely t hat ind ustr ial cr ime will pay.
The soli d-state r epeatei·sunique combinations of laser receivers/ t r ansmi tte r s-a re the main eleme nts in a new securi ty system t hat ca n wr ap a protective beam around a building fo r miles.
Un like most laser systems, precise ali gnment of the transmitter w it h t he r ece iver is not cr itical. Also, t he beam energy is low enoug h to be safe fo l' t he huma n eye-less t han 10-7 jou les / cm2.
In terru ption of t he beam at any po int se nds a coded signal to a mon itor statio n, locating the po int where the beam was intercepted.

Fo r a typ ica l fence system (Fig. 1) , a maste r transmi tter is p laced at some co nt r ol poi nt, such as a facto r y gate. From here, t he beam is projected along t he fe nce to t he receiver of the first repeater.
The receive r a mpli fies t he p ulsed signa l and appli es it to t he repeater transm itter, sending it out at the sa me power level as fro m t he master transmitter . The beam is t hu s passed on from r epeater to repeater to t he master r ece iver.
The outp ut of t he r ece iver is passed on to a m aste r ala r m and disp lay pa nel, wh ich, upon interru ption of t he beam, g ives an a udible or visua l ala rm and also ind.icates t he interru pted repeater.
The most se nsit ive s.vste m spans 50,000 feet r eli ab ly in clea r weather. T here a re a lso 5000-foot and 500-foot systems. Under heavy fog conrlit ions, t he capab ili ty of all

tri gge r t he a larm, s ince t he laser pulse r ate has bee n specifically chose n to minimi ze thi s. In a ddit ion t he maste r r ece iver s ignals an a la rm onl y after a pr eset number of p ulses have not been r ece ived.
If t he beam is interru pted a head of any r eceiver , a beam-interru pt detector tri gge r~ a local r epeat eride nt ification oscillator, whi ch t hen sends pulses thro ugh t he remainder of the system at a rate uni que to that sta tion. These p ulses are decoded by logic t hat in d icates wher e t he inte rru ption has occurred.
Th e system developed ori g inally for t he mili ta r y, ma intai ns a constant tra nsmi tter di ode power outp ut fro m - 30 ° to 130 ° F t hrou gh regul ation of t he laser-di ode drive. Thi s is accompli shed by fee din g back a signa l fro m a su bm iniature thermistor, mounted on t he diode, to t he drive r- reg ul ator (F ig . 2 ) .··

The transmi tter s in t he syste m,

developed by Holobeam, I nc., Param us, N.J ., use a gall ium a r senide

MASTER TRANSMITTER

(GaAs) laser diode, dr iven by 30'A, 150-nsec pu lses at a 30-H z rate and rad iating in t he invis ible r egion at 9050 A. For m ax imum

a ,___ ____, PULSE -DRIVER
t------~
REGULATOR

LENS

PULSED LASER BEAM

se ns it ivity, t he rece ivers use a si li -

con photod iode t hat peaks close to

t he sa me wave length.

LASER REPEATER

INDUSTRIAL FENCE
T R~PULSED LASER BEAM / T
MASTER-..R UNITS

GATE

LENS
PULSED LASER BEAM

LASER REPEATERS
,/

( R- RECEIVER T-TRANSMITTER l

LENS
PULSED LASER BEAM

BEAM INTERRUPT
DET

REPEATER
!DoEsNcT

a PULSE-DRIVER REGULATOR

MASTER RECEIVER

AMPL
INTERRUPTED REPEATER 1---'---.! !DENT
BEAM
1~C::::'T r--------------'---o..i

GUARD'S
ALARM AND
DISPLAY
PANEL

1. Transmitters and receivers of the IR security system are small unitsonly a few inches 'long.
ELECTRON IC D ES IGN 11 , May 24 . 1970

2. Attenuation . of the laser beam is overcome in ea ch repeater by amplifying the received s1gna~ and proiect1ng the new transmitted beam at the original system level. Receivers and t ra nsmitters are separate units .
25

NEWS

Process squeezes out wire like toothpaste

The first major change in wire making since jewelers in ancient Egypt began drawing gold wire through drilled stones is reported by Western Electric's Engineering Research Center in Princeton, N.J.
Instead of drawing the wire, as has been done for nearly 4000 years, the new process squeezes it out like toothpaste. Fluid under

high pressure does the squeezing. Known as continuous hydrostatic
extrusion, the new process is said to offer a number of advantages over conventional wire drawing techniques. These include lower equipment costs, cheaper maintenance, greatly reduced space and power requirements, less wire breakage and reduced labor. There

VISCOUS DRAG FLUID

PRESSURE INTENSIFIER
A viscous fluid, such as beeswax, drags the wire rod through the chamber in the direction of the die. There , another fluid under very high pressure reduces the wire rod's diameter.

Scale model of continuous hydrostatic extrusion machine will be able to extrude aluminum wire at up to 4000 feet-per-minute in sizes as small as 0.02 inch (24 gauge). The actual machine being built by Western Electric will be about 14 feet long. Wire rod will be continuously fed into the rear of the machine (right) and will emerge from its front end (left) as wire.

are also indications that wire made by hydrostatic extrusion is stronger than drawn wire of the same gauge, according to Western Electric researcher, Frank Fuchs, Jr.
Fuchs notes that engineers have been intrigued with the idea of using the process to manufacture wire for many years, but until now, nobody knew how to feed wire into a high-pressure chamber on a continuous basis.
Western Electric researchers, headed by Fuchs, solved the problem by "viscous drag feeding"-a method of us ing a fluid to force wire rod through the high-pressure chamber and out of the die. A fluid, such as warm beeswax, is pumped through the chamber in the direction of the die. Under high pressure, this fluid becomes sufficiently sticky to adhere to the rod and drag it along.
Another fluid is pumped into one end of the chamber under very high pressure to reduce the wire rod's diameter in the "die." Strictly speaking, Fuchs notes, this is not actually a die, since it serves only as a shaped container for the high pressure fluid. Ther e is no metalto-metal contact as there would be in a true die.
A prototype production machine in corporating all of these features is presently being designed and built by Western Electric for installation in their Atlanta, Ga., facility by the end of the year. The machine is designed to produce aluminum wire at speeds up to 4000 feet-per-minute in sizes as small as 0.02 inch (2 gauge ) .
Fuchs says that only one pass through a single "die" will be required, regardless of the size of wire being mad e. Conventional wire making, he notes, requires drawing the wire through as many as 24 dies in tandem on two different machines.
Although the process will initially be restricted to the manufacture of aluminum wire, it is ultimately expected to be used in the production of copper wire as well. · ·

INFORMATION RETRIEVAL NUMBER 18 ~

NEWS
Coming: portable thermoelectric power

For a long time, the Army has been looking for a quiet, li ghtweight, high-enduranc e power source, so its troops on patrol can operate portable radar, communication, data-terminal and other equi pment without telltale noise.
Now, with a few modifications, it may have just what it has been waiting for. A manpack thermoelectric generator-a developmental model, temporarily designated PP6311-has been built by the Minnesota Mining and Manufacturing Co . in Saint Paul, under contract with the Electronic Components Laborator y, U. S. Army Electronics Command , Fort Monmouth, N. J.
The generator was described last week by two Army laboratory men - J oseph P . Angello and Stuart J . Shapiro-at the Power Sources Symposium at Fort Monmouth.
The manpack generator is only 12 inches hi gh, 12 inches lon g and 5-1 / 2 inches wide. It weighs 15 pounds without fuel. And it operates 12 hours on one refueling.
Ot her points the Army likes : · It starts easily-10 minutes after it's turned on, the system produces rated power. · It has multi-fuel capabilitydiesel or jet fu els or combat gasoline can be used.

Manpack thermoelectric generator weighs 15 pounds. Top portion contains all electri cal and electronic circuits for the power source. Bottom section contains the thermopile, burner, fuel, cooling systems and the battery (not visible) .
· It operates quietly. The Army's goal of "inaudibility at 100 feet" hasn't been reached yet, but with more effort it will be, the two laboratory men say.
The generator produces power output by direct conversion of heat energy of the fuels to electrical energy. The process takes place within lead telluride thermoelectric co u~l es that are contained in the

thermopile. Heat is applied to one side of the thermopile by burning liquid fuel in a burner mantle. The other side of the thermopile is kept cool by forcing air, by means of a fan, across a row of heat-dissipating fins.
The fuel is fed to the burner from an internal tank by an electric pump. Fuel is co nditi oned for combustion by an ultrasonic atomizer.
The airflow necessary for combustion is suppli ed by a blower in the lower burner assembly.
Ignition is initiated with a glow coil, also in the lower burner assembly. The thermopile provides power for a ll accessory components as well as the external load.
To get the generator started, battery power is needed. But before three minutes have passed, the thermopile has sufficient power to support the operation alone.
More work on the generator is needed, the Army says. For example, heat from the combu stion chamber is so intense it could ignite dry grass, or other flammable materials. Another problem is that the unit's 6-volt level is too low. The Army wou ld like 24 to 28 volts de, "to be cons istent with Army equipment." · ·

Contactless magnetic counter has high accuracy

A magnetically settable counter that will prod uce any combination of precisely timed electrical pulses on command has been developed at Sandia Laboratories, Albuquerque, N.M.
The device is set without the need for electrical contacts and therefore is said to be more reliable and accurate t han similar coun ter s.
Th e output pulse combinations are set simply by moving a calibrated knob, which moves a magnetic co il , to various positions along a helical winding of nickel-iron

wire . When voltage is applied to the coil, a magnetic reversal (domain ) is stored in that particular part of the wire.
When the counter is set therefore, the nickel-iron wire contains one or more domains that may be arranged at linear or logarithmic intervals as binary numbers or as a pr edetermined code.
The counter's memory is "read" by activating a two-phase clock. The clock applies alternating electrical pulses to a series of paired conductive metal elements, whi ch move t he domains along the nickel-

iron wire toward an output coi l. The coil senses the arrival of each domain and prod uces a n electrical output pulse.
The inventor of the device, Gordon R. Bachand, supervisor of Sandia's Advanced Test Instrumentation Development Div., says the number and complexity of pulses that can be stored by the coun ter is limited only by t he length of magnetized wi r e.
Reli ability and accuracy are high, he says, because there are no ohmic contacts, whose characteristics wou ld change with time . · ·

ELECTRONIC DESIGN 11 , May 24, 1970

10100 and 10200 Series
INDUSTRIAL
SCR1s

ID 100 Series
Anode current rating SOOmA @ 100° C Case . Voltage ratings to 200V .
200µ.a max gate trigger current. Peak On-Voltage 1.7V max@ 1 Amp .
T0-18 can with 0.5" leads.
(SSPI Product Group)

Only last month you couldn't touch an SCR in a metal package for anywhere near the price of plastic
Now you can ....

ID 200 Series
Anode current rating 1.6A@ 70°C Case . Voltage ratings to 200V .
200µa max gate tr igger current. Peak On-Voltage 2.2V max@ 4 Amps .
T0-5 can with 0.5" leads.
(SSPI Product Group)

· Sensing types start at 24c each in 100K lots. Comparably low prices on control types and smaller quantities.
· Typical Unitrode quality ... from the people who introduced the first lead-mounted SCR's 12 years and millions of SCR's ago.

· Electrically equivalent to most widely used plastic devices.
· Used for lamp or relay driving, sensors, pulsegenerators, timing circuits, motor controls, and process controllers.

JN STOCK READY TO DELIVER NOW · SEND FOR YOUR FREE SAMPLES AND COMPLETE SPECS

[1!D For Fast Action call Pete Jenner collect .. . today!
A PRODUCT OF THE WIDE RANGING SEMICONDUCTOR TECHNOLOGY OF

ELECTRON IC D ESIGN 11 , May 24, 1970

UNITRODE

580 Pleasant St., Watertown , Massachusetts 02172
INFORMATION RETRIEVAL NUMBER 19

(617) 926-0404 29

NEWS

The 1971 watch: No hands, no moving parts

John F. Mason
News Editor
Press a button on your all-electronic, solid-state wristwatch, and the time appears on a face that looks like a miniature TV screen. 'An array of small dots, called the dot matrix, lights up to form the numbers for the hour and minutes.
By touching the button once, the wearer programs the hour and minutes to remain visible for 1 1/ 4 seconds. If pressure· is maintained on the button, the hour and minutes disappear, and seconds appear and continue to count off time for as long as the button is depressed.
Release the button, and your wristwatch screen goes dark.
Prototype models of this watch without hands or moving parts have been developed jointly by the Hamilton Watch Co. of Lancaster, Pa., and Electro/ Data, Inc., of Garland, Tex. Production units are scheduled to hit the market next year.
There's no problem about seeing the numbers in poor light. A builtin light sensory mechanism detects ambient light conditions and automatically adjusts the intensity of the dot matrix through four levels of brightness. On a sunny day the light is eight times brighter than

when the time is displayed in a poorly lighted room.
Development of the watch was made possible by the recent availability of ICs that draw only 18 microwatts of power and a highenergy, rechargeable silver zinc battery.
Hamilton's research director, John M. Bergey, alluded to the need for ultra-low-power ICs and the high-energy battery in an interview earlier this year with ELECTRONIC DESIGN (see "Time Marches Onbut Electronically Now," ED 7, April 1, 1970, p. 25 ).
Digital display in all-electronic watch that will sell for $1500"..

Hamilton will distribute the new wristwatch for $1500 retail.
Logic circuitry used
Called Pulsar, the watch computes and displays time electronically utilizing computer logic circuitry and gallium arsenide phosphide light-emitting diodes. The unit consists of three major components:· a time computer module with microminiature logic and display circuit substrates, a 3-cell, 4-1 / 2-V battery and a high-frequency, quartz crystal time base.
The operation begins with the battery stimulating the quartz crystal, which vibrates at precisely 32,768 cycles a second. The vibrations are then reduced to one pulse a second by a multi-stage, integrated circuit binary counter, which passes the pulses through the time computer module to timedisplay circuitry.
"The high rate of vibration, or frequency, is four times greater than in electro-mechanical quartz crystal watches and enables us to achieve an unprecedented degree of accuracy," says Bergey. "Units we've been wearing have not deviated more than three seconds a month."

z" DIVIDER

SET

RESET

.. - ~

..... -~
·· ··

OSCILLATOR

QUARTZ CRYSTAL
The battery in this solid-state watch stimulates a quartz crystal, which passes pulses through the time-computer module to the time-display stations. Components in photo

TIME
[ill~ ~0 @] ffi)
DISPLAY
are (from top to bottom): the battery, the display side of the computer module, quartz crystal and the module's logic side.

ELECTRONIC D ESIGN 11, May 24, 1970

So far only six of the wristwatches have been built.
"We not only had to create our own battery," Bergey says, "but to reduce it to operable size, we equipped it with a demand button, so that time would be displayed only on request."
This was done to conserve energy.
Supplying the power
The high-energy main battery, occupying 80% of the volume of the case, performs the dual functions of exciting the quartz crystal and maintaining the charge in a similar, internal sustaining battery -actually a capacitor-that continuously drives the logic circuitry of the computer module. The main battery is 1.035 by 1.4 by 0.196 inches. It operates for six months and can be recharged 50 times.
Spent batteries are replaced by unscrewing the back of the case and inserting a fully charged spare.
"No accuracy is lost during the exchange," explains George Thiess, president of Electro/ Data. "We have equipped the timepiece with a second energy source, permanently located on the underside of the logic circuit, to supply sufficient power to operate it during this brief period."
The watch contains 44 complementary-symmetry, met a 1- oxide semiconductor (MOS) integrated circuits. The circuitry, equivalent to 3474 npn and pnp transistors, is thousands of times more conserva:tive of power than the more conventional bipolar and noncomplementary MOS-ICs, says Hamilton's president, Richard J. Blakinger.
The logic circuitry consists of seven individual hybrid circuits on alumina oxide substrates 0.020inch thick.
The ICs, the hybrid-circuit logic substrates, display substrates and all wiring are utrasonically bonded and mounted on separate gold-plated shim plates of 0.015-inch-thick beryllium-copper. The shim plates, with their circuitry, are screwed together back-to-back and constitute a fixed-program computer approximately 1/ 10-inch thick. The computer and its internal sustaining battery are potted in epoxy and cannot be jarred out of order, Hamilton says. · ·
ELECTRONIC DESIGN 11, May 24, 1970

High impedance (1011n) FET differential input Adjustable gain of 1 to 1000
lntronics' model FA601 instrumentation amplifier is the optimum selection for transducer applications requiring precision, small size, and economy. Featuring a FET differential input with a high impedance of 1011n, the FA601 offers programmable gains of 1 to 1000 independent of the input circuit by means of a single resistor, a low input current of 100 pA, and a large unity gain bandwidth of 1 MHz. Special attention has been made to mir:iimize noise generated by the input stage.
The combination of high input impedance, a high CMRR of 86 dB, and low noise make the FA601 ideally suited to: · biological probes - thermocouples - strain gages · current sensing · servo amplifiers · multiplexer buffering
The FA601 's modular package, 2 x 2 x .625 inches, and light weight, 21/2 oz., allows convenient location near low level signal sources thereby eliminating cable noise and unwanted signals. The unit operates from ± 15 to ± 18 volt supplies and is easily connected to etched circuit boards or plugged into a mating socket. Price (1-9): $65.
For technical data or applications assistance on model FA601 or lntronics' broad line of specialized analog products write or call lntronics, 57 Chapel Street, Newton, Mass. 02158, Tel. (617) 332-7350; TWX: 710-335-6835.
· Scope trace demonstrating rejection of common mode noise reproduced from actual Polaroid scope photo.
111 intr«,nicM
INFORMATION RETRIEVAL NUMBER 20
31

NEWS

Laser makes air visible to aircraft designers

Fog moving past model plane in a wind tunnel at 4000 mph is illuminated to reveal the turbulence

Strange things happen to air rushing past an aircraft at six times the speed of sound. To design aircraft to travel at such speeds, aerodynamic engi neers have long needed to "see" the airflow and turb ulence clearly.
To help them examine both, wind-tunnel operators have often introduced smoke and water vapor into the air-stream and illuminated the area around the model aircraft with high intensity lights while photographs were taken. The airflow becomes visible under these

conditions because areas of low temperature contain more water particles, which in turn reflect light. Hotter areas contain less water particles and are" therefore less visible.
Now, using essentially the same principle-but with the big addition of a laser-engineers are getting better results.
Laser illuminates moisture
A continuous-wave, helium-neon gas laser was installed on one side

of a wind tunnel and a camera on the other. The laser illuminates the natural moisture in the air-which, when the air is pushed to speeds of 4000 mph, turns to fog-and the camera records the whole show.
The results with the laser are superior to those obtained with conventional lights, according to engineers at the Air Force Systems Command's Arnold Engineering Development Center at Tu llahoma, Tenn. The work is being carried out by ARO, Inc., for the System Command's Flight Dynamics Laboratory, Wright-Patterson Air Force Base, Ohio.
The laser-painted picture has much more resolution than the one illuminated by the high intensity light, the test engineers say. And, by placing the laser on one side of the tunnel and the camera on the other, they are obtaining a better perspective.
"When the laser looks back at the model aircraft from an angle of less than 90 degrees and the camera on the opposite side does the same, you get an almost threedimensional effect," one engineer notes.

CW LASER

WAKE PATTERN

PLANE OF ILLUMINATION
Laser and camera collaborate to show ae rodyna mi c enginee rs shock waves when wind rus hes past a model a ircraft at s ix t imes th e speed of sound. The turbulen ce behind t he ta il st ruct ure here is so pronoun ced t hat it looks like a ve rt ica l stee l rod emerging from a horizonta l layer of s moke.

Portability a feature
The laser is also portable. It can be moved around to provide varying perspectives.
The laser was built by Spectra Physics, Inc., Mountain View, Calif. Using 15 milliwatts of power, it operates at 6328 A.. It is mou nted on a swivel arrangement that permits it to beam through a verticle slit and across the test section, scanning the model from nose to tail.
Besides the laser tests, an oi lfilm technique is also used to study the flow of air over the surface of the model. This involves painting the model with viscous oil. As oil flows over the surface, the oil shapes itself to the airflow.
The oi l stays in place even after the model is removed from the air stream. ··

INFORMATION RETRIEV A L NUMBER 300 THRU 306 ....

component and Circuit Design

FROM
SYLVANIA

MICROWAVES
How m1cros1r1p designs solve microwave problems.
We've spent over four years in research and development to come up with some very interesting solutions to microwave miniaturization problems.
Our microwave people have spent a lot of time developing techniques for miniaturizing microwave circuitry. They have done microwave projects for both military and commercial applications and have the experience to turn your microwave project into a hybrid package that will fulfill your demands at minimum cost and in minimum size.
We have pioneered the development of beam-lead technology to give us a new and powerful technique for mounting semiconductor devices on microstrip circuitry. For example, we use Sylvania-developed lownoise, beam-lead silicon Schottky diodes in mixer applications, and we use beam-lead PIN diodes for many switch and phase-shifter applications. All of these devices meet the stringent military environmental specification.
To give you an example of our capability, we can list at least three microwave systems that have been developed around our hybrid microwave capability.
These developments include an integrated man-pack radar, an integrated Ku band transceiver and an integrated mixer assembly for a highly specialized application.
For the integrated man-pack radar system we developed a lightweight X-band system almost completely in hybrid integrated circuit form. The radar transmits a pseudo-random phase-coded CW signal. All functions of the radar, including

This issue in capsule
CRTs-Get high speed printouts with these monoscopes. Hybrid Microelectronics-Diode matrix modules
give you design flexibility. Television-We've squared off the color bright 85®tube for 1970.
Microwaves-Millimeter wave source puts out up to 50 mW CW. ICs-How to use programmable dividers as pulse-train gates. Diodes-TV high-voltage diodes minimize x-radiation.
Manager's Corner-Will the real Schottky barrier please stand up?

the low-frequency analog and digital circuitry, with the exception of a miniature coaxial avalanche oscillator and the antenna, are made in microstrip integrated form.
These units include an RF phase modulator, high speed RF switches, an oscillator that uses a Sylvania silicon avalanche diode, a balanced mixer using a beam-lead Schottky barrier diode, ferrite circulators and other passive transmission line components.
The hybrid integrated Ku band transceiver is in development under Air Force sponsorship (Contract No. 3361667-C-1896). In this project we are developing techniques for integrating a large number of functional components on a single alumina substrate at 13.3 GHz. The system, designed to operate as a doppler navigator transceiver, includes: master oscillator using a varactor-tuned avalanche diode that is frequency-stabilized by an integrated phase discriminator; a cascade of avalanche diode power amplifiers producing 100 mW CW output at 13.3 GHz; a frequency shift-key modulator using beam-lead Schottky barrier diodes; T-R switch using beam-lead PIN diodes; a balanced mixer using beam-lead Schottky barrier diodes; and an IF amplifier having a 1.5 dB noise figure at 120 MHz. The third project that demonstrates Sylvania's capability in miniaturized microwave circuitry is an integrated mixer subassembly designed and developed for a highly

specialized military application. The subassembly consists of a bandpass filter, 3 quarterwave contradirectional couplers, and four balanced mixers. All of the units are integrated on four alumina substrates. The individual substrates are interconnected with gold ribbons.
Design goals included minimum cross coupling between mixers, and packaging design that minimizes damage from shock and vibration. Semiconductor devices used in the subassembly include beam-lead Schottky diodes in the mixer circuits.
This integrated subsystem, specially packaged to withstand stringent environmental requirements, is now in volume production.
Among the other components that can be integrated by Sylvania into complex subsystems are limiters, detectors, circulators and isolators.
Circuits can be supplied unpackaged for assembly by the user, or can be packaged by Sylvania in rugged, hermetically sealed enclosures with coaxial connectors or other types of input-output connections.
If you have a microwave design problem, why not talk to our experienced microwave design engineers? You may be surprised at what they can do for you.
CIRCLE NUMBER 300

CRTs
Get hiUh-soaad printouts with these monoscooas.
Simple CRT system can generate over 30,000 characters per second from magnetic tape.

A monoscope is simply a cathode-ray tube which converts digitally coded information into video type signals. Because of this, it is a very valuable interface between computers and output display devices. And because we can tailor the target characteristics to the users' specifications, there is no problem in generating special symbols for chart, diagram and map displays as well as alphanumeric characters.
In its simplest form, a monoscope resembles a conventional CRT with electrostatic focus and deflection, with the exception that a solid metal disk replaces the phosphor screen. A typical monoscope of this type is shown in Fig. 1.
The metal disk has a surface which possesses good secondary emission characteristics. The alphanumeric characters or symbols are printed on the disk with a material having poor secondary emission characteristics.
When the electron beam scans a single character in a raster-like pattern, a video signal corresponding to the shape of the character is produced. An identical raster scans the display tube. The beam intensity of the display tube is modulated by the monoscope's video output and the character is produced on the phosphor screen. Used in this manner, the monoscope can produce up to 30,000 symbols per second.
The cathode of the monoscope is generally operated at 1200 to 1800 Volts below ground so that the anode can be run at or near ground potential. This simplifies the design of character selection circuitry from the information source.

A second type of monoscope is shown in Fig. 2. This type

uses a stencil-type target where the characters have been

chemically etched through the disk. The principle of opera-

tion is exactly the same as the first type described.

However, the stencil provides some advantages. Since

the beam proceeds unhindered through the stencil open-

ings, it can be displayed on a phosphor screen deposited on

the face of the tube. This provides an easy means of visu-

ally checking what is being scanned and is very useful in

setting up the tube for operation.

The third type of monoscope is shown in Fig. 3. It also

makes use of a stencil target, but it is used in a different

manner. In this case, surface condition of the stencil is not

important. We only use that part of the raster that gets

through the stencil and impinges on the front plate. This

type of monoscope has many advantages. No target surface

preparation is required. It can be mass produced at low cost.

A typical monoscope target format is shown in Fig. 4.

An 8 x 8 matrix is fairly standard, but 8 x 12 or 10 x 10

formats can also be used to obtain both upper and lower

case characters.

Targets can be custom-designed to meet your require-

ments and can be fitted to any of the three types of mono-

scope tubes. Some of the applications for these monoscopes

include computer display, airline status boards, stock quo-

tation boards, teaching machines, address label printers,

command control center displays, or anywhere that a high-

resolution electronic information readout system is re-

quired.

CIRCLE NUMBER 301

GLASS ENVELOPE

A NOOE

COLLECTOR

TARGET

' '

-1200 v

Fig. 1. Basic monoscope using solid target.

-1200V

GLASS ENVELOPE

ANODE

SCREEN

==-= - - - - --=--=-..:.:::-=

----~~
_II_

Fig. 2. Monoscope using aluminized stencil target.

-1200V

GLASS ENVELOPE

ANODE

STENCIL

c:::=-:=

-=--=---

-------'--,~II I

SIGNAL PLATE
'

-2!5V Fig. 3. Monoscope using untreated stencil and signal plate.

·
· ' & i'. $ +* '' 7 ..

·/.-,+*)(-

·76543210-

·?>=<; :98-.
-GFEDCEA@·

J I - n v., ·1,1 I "'""

~1 "1
· 1' -

wI I ·

-WVUTSRQP·

· ·JxJ«CZYX·

Fig. 4. Typical target stencil for alphanumeric readout ·

HYBRID MICROELECTRONICS
Diode matrix modules give rou design llexibilitr.
Our. semiconductor and hybrid microelectronics groups team up to offer a wide range of module designs.
Because Sylvania is both a manufacturer of semiconductors and a maker of hybrid microelectronic assemblies, we can offer you a wide range of diode types packaged to your specifications. Using our thick-film packaging approach we can design diode arrays incorporating precision thick-film resistors.
Take, for example, our diode array module. This module is a 13 x 32 diode array containing both pull-up and load resistors. The diodes are high-speed, low-capacitance types. The thick-film resistors are stable cermet elements having low temperature coefficients. These resistors can be trimmed to a tolerance of 0.2 % for weighted-network applications.
Other matrix forms are available that will let you in-

crease the efficiency of your logic system design without getting involved in the use of more complex monolithic structures.
Up to 512 diodes can be provided in a single package. The custom matrix design can provide address arrays in 20 x 25, 16 x 32, or in any subcombination that the design might require.
The diode matrix and resistor module can be used in
mmuanltyilevaeplplgicaatitniognsstriuncctluurdeisn,g:ANcDod/eO-tRo-cgoadteingc,ondveceorsdiionn~
networks, nondestruct permanent memories, and weighted networks. Some typical applications are shown in the diagrams.
The wide flexibility of our design approach allows us to offer you any combination of diode arrays with or without resistor elements. The final package configuration can be determined by the system application. Flat packs and dual in-line packages can be provided as well as hermetically sealed or encapsulated modules.
You'll be surprised at what our semiconductor hybrid microelectronics teams can come up with to meet your logic system needs.
CIRCLE NUMBER 302

(AJ ANO/OR GATING

(BJ WEIGHTED D/A NETWORK R

( CJ MULTILEVEL GATING

(OJ CODE CONVERTER

Four examples of how our diode matrix modules can be used.

TELEVISION
We've squared-on the color briaht 858 tube tor 1970.
New color-tube design gives more usable area with a 3 x 4 aspect ratio.
Here's your chance to become a real "square" in your next color TV set design. We've come up with a new family of color bright 85 picture tubes that give you squared corners and straighter side lines. The new tubes also feature a 3 x 4 aspect ratio which closely matches the configuration of the transmitted TV signal.
The new tubes are available in 19", 21" and 25" sizes and, of course, all of them feature Sylvania's new improved MV phosphor system that is 30 % brighter than previous designs. An outline drawing of our new squared-corner 25" tube is shown in comparison with a conventional 23" tube in the illustration. Note that screen area is increased to 315 sq. in. in the new tube as compared to 295 sq. in. in the conventional design.
As in other color bright 85 picture tubes, the new squared-off line features an aluminized screen for highest brightness. In addition, these tubes are available with a system light transmittance of 51 % . The face panel is a neutral gray filter glass to improve picture contrast.
The new tubes also have a new front panel and funnel design that increases X-ray absorption. When tested in accordance with standard JEDEC procedures, the X-radiation of these tubes does not exceed 0.5 mR/ hr. for the

2!5" v
l3X4)
--~~23 " v (3.13 X4)

--1---- . - - - - -----+ - - -

- - 2!5" v

23 " v
~~

27.466"_ __ - - MAJOR _____ 21. !501 "

17.375"_ - ___ MINOR-- - - _17.263"

26 . 202"_ - - _ DIAGONAL - - --24 . 566 "

31!5 SQ . IN. __ SCREEN AREA - - - 295 SQ. IN .

Faceplate outline of new squared-off 25" color picture tube as compared with conventional 23" picture tube.

useful life of the tube even when operated beyond the

design-maximum ratings of the tube.

As with all color bright 85 tubes, a temperature-compen-

sated shadow mask is a standard feature to prevent loss of

purity by uncontrolled thermal expansion. A sharp-focus

electron gun that achieves tighter beam bundling, and in-

tegral kimcode implosion protection are also features that

make the new squared-off color bright 85 the tube to plan

your next color set around.

CIRCLE NUMBER 303

DIODES
TV hiUh-vo11aue diodes minimize x-radiation.
Solid-state diode tripler and quadrupler assemblies cut down on radiation from high voltage section of TV sets.
One of the major sources of X-radiation in color TV sets is in the high-voltage cage. You can minimize this radiation by switching over to our high-voltage silicon diode multipliers.
In addition, you'll save money by eliminating the highvoltage cage and its associated hardware. High-voltage regulation is also improved since the loosely-coupled tertiary f!yback winding is eliminated.
Since each application of these high-voltage multipliers is unique, we don't offer them as off-the-shelf items. Our engineering staff will work with you to tailor a unit to fit your design needs.
One of our typical designs is shown in the illustration. It's a tripler circuit that takes an 8.5 kV input from the flyback transformer and puts out 25 kV DC to the color tube anode. Loading can be as high as 2.5 mA with minimal drop in output voltage. This circuit also provides a tap for the focus supply voltage.
The diode stacks used in our high-voltage multipliers are all carefully matched. They are then molded into a plastic package along with their associated capacitors. The plastic package will more than meet the environmental requirements of solid-state and hybrid color TV sets.
These requirements include such things as over-voltage

Typical high-voltage tripler delivers 25 kV to color tube anode.
INPUTO~
PULSE 8 .!5KV
~1--~ll'-----11-----"''----H---+---<o ~~~~u~c
FOC US VOLTAGE SUPPLY
surges, arcing and ambient temperature conditions. Why not discuss your high-voltage requirements with
our diode engineers. They'll show you how to reduce radiation and save money at the same time.
CIRCLE NUMBER 304

INTEGRATED CIRCUITS
How to use programmable dividers as PUise-train gates.
Simple circuit can be programmed to provide N consecutive output pulses on command.
Here is an application of our functional arrays that shows the flexibility of these devices. The SM-143 and SM153 are both programmable, synchronous down-counters with a built-in decoder that gives a logic "1" output when the counter is in the 0000 state. These programmable dividers are identical in operation except that the SM-143 is programmed by binary numbers and the SM-153 accepts a BCD input.
These dividers are ideal for use as programmable pulsetrain gates. The strobed data entry (SET ENABLE) makes it easy to program the counters without adding external logic circuits. The four-input clock gate reduces clock loading and allows logic flexibility. The internal decoder gate and single output cut down on package count and, in addition, power drain is significantly reduced since the four flip-flop outputs are not brought out of the package. A four-bit counter with similar features would use about 100 mW more power.
The circuit diagram and timing waveforms for a programmable pulse-train gate are shown in Fig. 1. For purposes of illustration we are assuming that there is a binary 17 on the input lines.
Grounding the CLEAR input resets the counters to 0000 and causes their decoded outputs (A and B) to go high. (The CLEAR pulse must be at least 150 ns wide.) The high outputs from the counters are applied to the NAND gate (Gl) whose "O" output now inhibits the CLOCK input to the system, thus maintaining a static condition.
When the START input is raised to a logic "1", the binary number (in this case, 17) is set into the proper counter flip-flops and decoded outputs A and B go low. The output of Gl now goes high and enables the first SM-143. (The second is still inhibited by decoded output A.) The START pulse must occur when the CLOCK input is low.
The system now allows 17 clock pulses to go through G2 in the following manner: The output of the first SM-143 (output A) goes high as the first clock pulse counts it from 0001 to 0000. This high input enables the clock gate of the second SM-143. The second clock pulse causes the second SM-143 to go from 0001 to 0000 thus setting output B high, at the same time changing the count in the first SM-143 from 0000 to 1111 and causing its output (A) to go low.
The logic "O" at A now inhibits the clock gate of the second SM-143 so that it remains at 0000 while the first SM-143 is counted down from 1111 to 0000 by the next 15 clock pulses (pulses 3 through 17) . At this point output A goes high again. Outputs A and B are now both high, forcing the output of Gl to go low inhibiting the entire system. The system is now in the same condition that occurred after the CLEAR pulse. It will remain in this condition until another START pulse occurs.
If an asynchronous START pulse is desired, additional logic can be added as shown in Fig. 2. In the static condition, both counters are at 0000 and their outputs A and B are high, setting the output of Gl low. Gate Gl now inhibits the output gate G2 and the inputs to both counters.
When the start input goes high it allows the programmed number to enter the counters. This will cause the counter outputs A and B to go low. The high START input is inverted by G4 which resets FFl and disables the J and K

.--++++-------<r---...++++--------,~CLEAR
RT ~---+---+--++-++---..-----+--<>sTA IL (SET
ENABLE)

c
PULSE TRAIN OUT

CLOCK

If THE INPUT NUMBER N= 17(BINARY)(OOOIOOOI) FOR SM 143°S

CLEAR START

CLOCK

lo OUTPUT A ~15141312n 10 9 8 7 6 5 4 3 2 I

OUTPUT B ----ot.....!_jo

GATE OUTPUT C
PULSE OUTPUT

t 2 3 4 5 6 7 8 g· IO II 12 13 14 15 t6 17

Fig. 1. Programmable pulse-train gate with timing waveforms for a binary 17 input.

NANO GATES SG 140 AND GATES SG 280 FLIP· FLOP SF 200

CLOCK

PULSE TRAIN OUTPUT

Fig. 2. Circuit of programmable pulse-train gate for use when an asynchronous START pulse is required.

inputs. The Q output of FFl then maintains the inhibit

condition on G2 and both counters. This condition is static

as long as the START input remains high.

When the START input goes low, G4 output goes high.

This enables FFl. The first positive clock edge to occur,

after the START input goes low, is inverted by gate G3 and

clocks FFl. The Q output goes high, enabling the output

gate G2 and both counters. This and succeeding clock pulses

are gated and counted as explained previously, the Q out-

put of FFl which is now low is connected to the K input,

thereby preventing resetting of the flip-flop by the clock

pulse output from G3 until the next START pulse re-initi-

ates the cycle.

CIRCLE NUMBER 305

MICROWAVES
Millimeter-wave source outs out up to 50 mw cw.
Fixed tuned, high efficiency source is available in frequency range from 52 to 70 GHz.

Solid-state millimeter-wave source. Optional half-frequency output port is visible on side.

AVALANCHE OSCILLATOR

TRIPLER

DIRECTIONAL COUPLER
(OPTIONAL)

OUTPUT FILTER (OPTIONAL)

5MW MIN. 52-70GHz

AUXILIARY OUTPUT AT FouT/2
Block diagram of SYG-2040 showing the basic options available.

Our SYG-2040 series solid-state millimeter-wave source is a new component that is particularly suited to applications including local oscillators, paramp pumps, and lowpower transmitters where long life is required. It also comes with a number of options that make it easy to fit it into a specific system requirement.
Basically, the SYG-2040 uses a high-power avalanche diode oscillator to drive an efficient tripler-doubler multiplier chain. The output frequency may be specified anywhere in the 52 to 70 GHz range.
Among the options available are a low-loss cavity output filter for applications requiring minimum noise sideband

power, and an optional sampling port that provides a 5 mW (min.) signal at half the final output frequency. In addition, the fundamental oscillator can be modified to enable either phase or injection locking techniques to be employed where frequency stability is important.
The basic SYG-2040 solid-state source comes in a 2" x 2" x 6" package. Models with the optional attachments are housed in a slightly larger package. A constant-current DC supply between 70 and 100 V and 60 to 110 mA (10 W max.) is required to drive the avalanche oscillator.
CIRCLE NUMBER 306

SEE OUR SPE C IFICATIONS IN
M IC ROFI L M C ATALOG FILE
Use Sylvania's "Hot Line" inquiry service, especially if you require full particulars on any item in a hurry. It's easy and it's free. Circle the reader service number(s) you're most interested in; then fill in your name, title, company and address. We'll do the rest and see you get further information by return mail.

·------------------------------------------

BUSINESS REPLY CARD
No Postage Stamp Necessary if Mailed in the United States

FIRST CLASS Permit No. 2833 Buffalo, N.Y.

POSTAGE WILL BE PAID BY
Sylvania Electric Products Inc. Sylvania Electronic Components
1100 Main Street Buffalo, New York 14209
Dept. E 3 3 3 3

MANAGER'S CORNER
Will the real Schonkr barrier Please stand up?
Several years ago, when Schottky barrier diodes using evaporated metal contacts were introduced, many engineers began to call the older point-contact types "the poor man's Schottky". Now that we have had time to compare both types, we wonder if it is entirely fair to use the connotation "poor man's" in referring to point-contact diodes.
Both diode types have really come of age within the past two years. Only now are we really beginning to find out the true differences between them in laboratory circuits and in operating radar systems. And strangely enough, the pointcontact mixer/ detector, with its tungsten whisker wire and pressure contact to epitaxial silicon, does not always come out as the underdog when compared to the more sophisticated Schottky barrier types. Perhaps even more significant, several distinct advantages and disadvantages of each type of diode can now be clearly seen.
Both types of devices are now made to cover the frequency bands from L to KA. Point-contacts do have a slight edge in being commercially available to meet requirements up to 100 GHz.
Generally speaking, in mixer applications, Schottky barrier diodes are available with up to 0.5 dB improvement in noise figure over equivalent-frequency point-contact types.
Above X-band, however, this advantage disappears and the noise figures are equal. For other important parameters such as RF and IF impedances, somewhat tighter controls can be maintained for Schottky barrier types.
If you consider local oscillator power level degradation with time, or situations where local oscillator power must be varied, you should take a careful look at the Schottky diode. In general, you'll find it is not the better choice of the two. On the other hand, the dynamic range of the Schottky barrier device is better than that of the point-

contact diode, making it the device of choice where this is an important parameter.
Also, in Doppler radar systems using the homodyne principle, the inherent low audio-frequency noise of the Schottky barrier device gives it an advantage over the point-contact diode in noise figure. In addition, microphonics are almost nonexistent in Schottky barrier devices.
Possibly one of the most important criteria to be considered when choosing between Schottky and point-contact diodes is resistance to "burnout" or degradation caused by external pulse power, spike energy, or CW power. Here the data are not sufficient to fit every circuit but, generally speaking, point-contact types are certainly to be favored under these conditions.
With rare exception, point-contact diodes made by the latest fabrication techniques can withstand 3 to 10 dB more incident power than an equivalent Schottky type. On the other hand, where burnout resistance is not a problem, the Schottky device has sufficient advantages to be the leading contender for new circuit designs.
Although it was originally assumed that the Schottky barrier diode would be superior to the point-contact type in environmental tests, such as shock/ vibration, this has not proven to be true. Point-contact devices have passed the most stringent MIL-STD tests successfully. Here we have equality but no superiority.
Although we've been working hard to replace the grandfather of all diodes (really, ofall semiconductor devices) the point-contact is not yet ready to retire. At the age of 27, he still has many good working years left. The Schottky barrier, by comparison, is still a baby and is just beginning to face the world.
We, as manufacturers, still have a long way to go before we can announce that a choice no longer exists between Schottky and point-contact devices.
~!.~"+:.~:::::-

This information in Sylvania ideas is furnished without assuming any obligations.
SYLVANIA
GENERAL TELEPHONE & ELECTRONICS
NEW CAPABILITIES IN: ELECTRONIC TUBES· SEMICONDUCTORS· MICROWAVE DEVICES· SPECIAL COMPONENTS· DISPLAY DEVICES

------------------------------------------~II

CITY _ _ _ _ _ _ _ _ _ _ _ _ STATE _ _ _ _ ZIP _ _

f J

Circle Numbers Corresponding to Product Item

J J

300

301

302

303

304

305

306

J I

Please have a Sales Engineer contact me.

OVisit OPhone ..· Phone No._ _ _ _ _ _ _ _ _Area Code_ _ _ _ __

HOT LINE INQUIRY SERVICE
Need information in a hurry? Clip the card and mail it. Be sure to fill in all information requested . We'll rush you full particulars on any item indicated.
You can also get information using the publication's card elsewhere in this issue. Use of the card shown here will simplify handling and save time.

Centralab gives transistor circuits longer, more reliable performance
with NEW 16, 25 & 50 volt Ultra-Kaps®
Centralab engineers have achieved a new degree of temperature stability in semiconductor type, low voltage ceramic disc capacitors with their development of temperature-stable Ultra-Kaps. The 16 and 25 volt units can hold a maximum capacitance change of +4.7%; 50 volt units as little as + 7.5%.
Ultra-Kaps also exhibit other superior performance characteristics, such as low impedance; high capacitance density; and operation to temperatures as high as 150°C, as low as -55°C. In 50v ratings average dissipation factor is as low as 1.5% ; leakage resistance of 1000 megohms, min.

Ultra-Kaps are ideal for use in transistor circuits because they are operable to a frequency of 1 MHz. And they' re still low cost units that replace more expensive mylar and " Hi-K" ceramic capacitors. On quantity orders, they're priced as low as 2112 cents each with delivery as short as 4 to 5 weeks. We can send you samples immediately for your evaluation .
Don 't let your design plans melt away because of inferior capacitor performance. Get the ultimate, Centralab's stable Ultra-Kaps.

CENTRALAB
Electron ics Division GLOBE· UNION INC. 5757 NORTH GREEN BAY AVENUE MILWAUKEE, WISCONSIN 53201

16 volt

25 volt

50 volt

Max. Max. Cap. Min. l.R. Max. Cap. Min. l.R. Max. Cap. Min. LR. Diameter MFD Megohms MFD Megohms MFD Megohms

.290

.02

5.0

.015

65.0

.01

1000

.390

.033

3.0

.405

.05

2.0

.485

.022

45.0

.Ql5

1000

.033

30.0

.022

1000

.515

.068

1.5

.05

20.0

.033

1000

.590

0.1

1.0

.068

15.0

.047

1000

.690

0.15

0.65

0.1

10.0

.05

1000

.760

.820

0.2

0.5

0.15

.068

1000

6.5

.920

0.3

0.33

0.2

5.0

0.1

1000

·Thickness : .156 inches maximum Lead spacing : Di scs less than .500" diameter, nominal lead spacin~ is .250"
Discs .500" and larger, nominal lead spacing is .375 '

M-6901

FOR MORE INFORMATION AND / OR DESIGN ASSISTANCE, WRITE CAPACITOR SALES MANAGER, CENTRALAB.

INFORMATION RETRIEVAL NUMBER 21

ELECTRONIC D ESIGN 11 . Ma y 24, 1970

a ''

e
0-1

512 bits (64 x 8) 65 ns access time 0° to + 75°C, $47.00* - 55° to + 125°C, $61.50*
*100 - 999 unit price
34

ELECTRO IC D ESIGN 11. May 24. 1970

ONE PROM*FOR ALL ROMS - - - - *(Programmable Read-Only Memory) It's made for a complete range of applications: · Microprogramming · Combinational Logic · Sequential Logic · Code Conversion
... or any application requiring many R0MS of differing patterns.
HERE'S HOW YOU GET IT!
1. Order the ROM-0512 off the shelf. 2 . Generate the truth table. 3. Electronically program each PROM, yourself. 4 . Plug it in!
HERE'S WHAT YOU GET!
· Custom programmed ROMS · 65 ns access time · DTL/TTL compatibility · Wired "or" output · 24-lead dual in-line or 24 lead flat pack
...And we haven't even scratched the surface!

Lexington. Massachusetts (617) 662-1055 Norwalk, Connecticut (203) 853-3646 Frederick, Maryland (301) 662-5400 Oaklawn, Illinois (312) 423-6010 Dallas, Texas (214) 231 -9031
Albuquerque, New Mexico (505) 268-3549 Palo Alto, Cal ifornia (415) 321 -2280
Long Beach. California (213) 426-7687 P. 0 . Box 37, Melbourne, Florida 32901 (305) 727-5430

EXPORT SALES, OAGE CORPORATION. STAMFORD, CONNECTICUT

ELECTRONIC DESIGN 11 , May 24, 1970

INFORMATION RETRIEVAL NUMBER 22

RADIATION
INCORPORATED
SUBSIDIARY OF HARRIS·INTERTYPE CORPORATION
MICROELECTRONIC S DIV ISION
35

Electronics scores

Ignition noise, corrosion and vibration are enemies of marine electronics. So the electronics on the con trol bridge of this Christ-Craft Commander Fiberglas yacht has noise-suppression circuitry and watertight, gold-plated avionics connectors. The equipment includes: a depth sounder, AM (2-5 MHz) and vhf-FM (156-162 MHz) radiotelephones , auto· matic pilot, automatic direction finder (200-1500 kHz) and radar. Special grounding is also provided .

Jim McDermott
East Coast Editor
Electronic aids are infiltrating the world of sports-from spectator events like football and horse racing to field and stream activities like fishing and dog training. The most spectacular are the huge stadium scoreboards, ranging from Cubic Corp.'!il $600,000 computer-operated, animated football scoreboard for the San Diego Municipal Stadium (see cover photo) to a new $4-million system now being installed at the Ontario (Calif.) Motor Speedway. The latter will be the world's first all-electronic timing, scoring and display system for keeping track of up to 50 autos in a 500-mile race.
Cubic's scoreboard, 29 feet high and 80 feet long, has 31,400 lamps, each 40 W and de-energized. The board is organized in a matrix of 110 rows by 310 columns and employs silicon controlled rectifiers. The design of heat sinking and cooling is critical in these systems, because the fully illuminated board consumes over a million watts. An advantage of the SCRs is that they are essentially a de memory element, remaining on

The newest electronics in small-boat navigation is a space-age version of an aircraft unit, by Radon,
Inc., Cos Cob , Conn. It uses vhf (108-118 MHz) Visual OmniRange (VOR) stations for obtaining
bearings, Traditionally, boat owners favor 200-kHzto -1500-kHz direction finders, which are subject to
a variety of errors caused by static, interference and propagation-effect fading. Vhf eliminates
these , but the signals from coastal VOR stations to boats are usually attenuated by intervening
terrain . Borrowing aerospace phase-lock and digital filtering techniques, Radon has produced a hundred -
fold increase in sensitivity over standard VOR receivers. The new equipment reaches down into the noise to extract a useful navigational signal.
36

ELECTRON IC DESIGN 11 , May 24, 1970

in sports

once triggered. But to update information, all conducting SCRs must be cut off and re-energized as new information is inserted.
Electronic timing systems have either completely taken over or are being used as backups in many sporting events traditionally timed by stop watch, :!luch as ski, ice-skate and bobsled racing, track events, swimming competitions, horse and dog racing, and automotive events. These timing systems can be simple or complex versions of a time base operating a mechanical or electronic counter and display. The time-base output is counted down to provide an accuracy of hundredths or thousands of a second.
For the time base, Heuer Time Corp. of New York City uses a 2000-Hz tuning fork, while Bulova Watch Co. depends on its Accutron. The Longines Watch Co.'s equipment for use with TV pickups has a quartz crystal time base with an IC binary countdown. Instead of requiring a separate TV camera to monitor the time display, the Longines system generates the numbers electronically and feeds them into the raster of a camera scanning the sports activity.

Conversation 100 feet down, without earphones and using only milliwatts of power, is like talking on the beach, thanks to a unique speaker-transducer design in Yack/Yack scuba diver communication sets (orange in the photo). The manufacturer, Y Square, Inc., of Santa Ana, Calif., says the trans· ducer is exceptionally efficient because of an oilfilled chamber that produces a very close imped· ance match between the driving element and the water around it. Sound is transmitted by vibrating the entire case of the unit.

E L ECTRONIC Dss10N 11, May 24, 1970

By building a plastic case and then designing the electronics to fit the case, Hartmann, Inc., of
Newark, N.J., has cut costs on four products: a fish finder (top), a hand-held direction finder with a compass (center), a wireless tachometer (bottom) and a depth sounder with a meter indicator (not shown). The Cycolac plastic is substantially superior to an aluminum case for withstanding abuse. By using the same case for all four products, Hartmann has reduced packaging costs from $3 to $5 for each item to about 75 cents.
37

>
f-
u
a:i
<,.(, ~"' "u0
38

For timing sports events, special systems have been designed. They include the Accutron Phototimer , developed by Bulova Watch Co. for track meets. Above , Bob Richards, Phototimer crew chief , mans a special slit camera at a Madison Square Garden track event. The slit is focused on the finish line , while the film moves by at a speed that freezes the racer 's motions. Fi gures on a digital counter inside the camera are strobed by a flash lamp and exposed on the film, as at left. Digital timing is controlled by a time base driven by an Accutron tuning fork, accurate to 1 part in 105 · Timing starts when a photocell transducer attached to the starter's pistol is triggered by the infrared energy of the fired blank. The photocell output is radioed to start the time-base counters at the camera .
ELECTRON IC D ES IGN 11 , May 24, 1970

Cubic Corp.'s giant football scoreboard (see cover photo, as well as this block diagram) is divided into three "game-in-progress" areas and an "animation" area. All sections can be controlled either independently or simultaneously by the operator. The system has a special computer with a 4-k, 30bit word structure and double-addressing for words. Double-addressing allows the updating of informa-

tion on one line while another is held constant. In operation, every location on the board does not correspond to a location in memory. Instead, the information is placed on the board ·in a column of lights and moved across the board in shift-register fashion. All data that flows through the system goes through the computer main frame, and in this fash ion can be constantly up-dated .

ELECTRONIC D ESIGN 11 , May 24, 1970

The world's first electronic timing and scoring system for auto racing, complete with a giant display board and four 50 -foot pylons that show the numbers of the top 10 cars , is a $4-million installation now being completed at Ontario (Calif.) Motor Speedway. For timing, radio transmitters are installed in up to 50 cars (compared with the present method at Indianapolis of sending hundreds of timers scrambling over the track with stop watches, eying assigned cars). Loop antenna arrays in the new system are buried at the start/finish line and at the entrances and exits of the pits. As a car passes over the loops , the receiver tuned to its frequency passes a signal to identification logic and to a controller clocking its time to l/lOOOth of a second. Two IBM computers control the entire operation. Computer No. 1 receives all the timing data, verifies it and stores it as a complex file , which computer No. 2 then searches to obtain updated race statistics. The statistics are available as a paper printout , on CRT monitors, or on big-board displays in any of a number of formats.
39

ELECTRONIC DESIGN 11, May 24, 1970

Now race-track fans can watch what once only the racing stewards saw-photo finishes and film play-
back of races to determine if any fouls were com·
rnitted. TV monitors are placed in the clubhouse , stands and other points within the parks-like the closed-circuit color TV system shown here at the Aqueduct track in New York City. These systems , engineered and installed at leading tracks throughout the country by Video Proj~cts , Inc. , of New Hyde Park, N.Y., use five to 10 cameras. Still photos of close finishes are transmitted directly from the ~rack ' s photo-finish room to 23-inch TV monitors within 30 seconds after the race is run. The video tape of a race-unlike the camera film , which takes .five to 10 minutes to process- can be played back :tor immediate viewing by the judges and fans. Special-effects equipment allows the system director to add such touches as split screens , lap dissolves and the insertion of text across the bottom of the JV picture.

HANO-HELQ YNII

COU.AA-MOUNTEO UNIT

"'_._,

JlANNTTDEDNONGA

WOVEN COLLAR

Color TV coverage of sports brings the thrills home, particularly with close-ups from the backpack camera. But behind the scene, problems are crying for solution, according to Laverne Pointer, director of broadcast engineering for the American Broadcasting Co. For example, the cables for field color cameras have 82 conductors and weigh a pound a foot. Golf matches require two or three mobile vans with up to 16 cameras and 2000 feet of cable. For field use , the cable is made up in 200-foot sections. Connector reliability is a headache , particularly when the cable lies buried under roads or fairways for days. If it is laid in the open , it is subject to rain, moisture and golf spikes. A much smaller and lighter cable, possibly with use of a multiplexing .scheme or some other reliable method of camera· to-van transmission, is needed. ABC uses microwave links between the backpacks and field stations, but only when cable can't be used. The microlinks (12· 13 GHz) suffer from multipath interference and random, variable attenuation .
ELECTRON IC D ESIGN 11 , May 24, 1970

A coded modulation signal is the key to success of a radio-controlled dog trainer, by Tri-Tronics, Inc., Tucson , Ariz. The dog wears a "shock collar" with a woven antenna, plus a receiver and shocking circuits that produce 5000 -V pulses across two neck electrodes. In use , the dog is allowed to pursue an undesirable behavior pattern. For example, a setter to be trained for pointing birds may chase a deer, with the trainer observing. When the trainer presses his transmitter button , the shock halts the dog in his tracks. The dog associates the shock with deer and then avoids those animals. The biggest problem with this type of equipment is accidental shocks due to random interference picked up by the dog 's receiver from Civilian Band transmitters , auto· ignition systems or power lines. This can ruin a $500 hunting dog in short order. To avoid this , the Tri-Tronics transmitter is modulated with a coded signal that is decoded in the collar unit.
41

Hyou're designln_g frequency-sensitive circuits, aren't these the measurements you should be making?

Oscillator Output Spectrum
Frequency scan: 0-100 MHz. Log display (LOG
REF= odBm) .
Oscillator output is flat at - 10 dBm, 20 to 30 MHz. Second harmonic is 35 dB down and flat; third harmonic goes from 50 to 55 dB down.

Spectral Purity Center frequency :
100 MHz. Scan width: 5 kHz/ div. IF bandwidth ; 300 Hz. Log display (LOG REF = O dBm).
Major noise sidebands are approximately
55 dB below carrier.

Frequency Drift Center frequency :
800 MHz. Scan width: 10 kHz/ div. Scans are triggered at 10 second intervals and.
stored on CRT. Drift = 42 kHz in 2 minutes.

Conversion Efficiency center
frequency: 50 MHz. Scan width : 5 MHz/ div. Log display (LOG REF = -10 dBm).
Double-balanced mixer with 0 dBm drive at 50 MHz and -30 dBm at 5 MHz. Display shows 45 and 55 MHz sidebands at -36 dBm; i.e., 6 dB conversion loss. (Display also shows signal feed-through at 50 MHz and harmonic distortion products at 40 and 60 MHz.)

AM Modulation Index Center
frequency: 60 MHz. Scan width : 10 kHz/di v.
+ Log display (LOG REF = 10 dBm) .
Low level 10 kHz modulation of 60 MHz carrier shows sidebands 40 dB down, i.e.,
2% AM. Sidebands as low as -70 dB or 0.06% modulation can be measured.

Harmonic Distortion Frequency
scan : 0-50 MHz. Log display (LOG REF = 0 dBm) .
Harmonic content of -16 dBm 5 MHz signal is displayed: 2nd harmonic -50 dB,
< 3rd harmonic -40 dB, others -60 dB.
Harmonic content as a function of absolute fundamental level can be observed.

Amplifier Response Frequency
scan: 0-500 MHz. Log display (LOG REF = +10 dBm).
With flat input at -20 dBm, gain and frequency response are read directly from CRT (20 dB gain, ±2 dB to 200 MHz, O dB gain at 320 MHz).
IM Distortion Center frequency: 60
MHz. Scan width: 100 kHz/div. Log display
(LOG REF = +io dBm).
Two-tone test using 59 .95 and 60.05 MHz
+ signals at 5 dBm each shows third-order
sidebands 30 db down. Higher order IM products can also be measured.

Transmission Bandwidth
Center frequency: 800 MHz. Scan width: 0.5 MHz/div. Log display.
Spectrum of pulsed 800 MHz carrier shows 2.2 MHz frequency range between -40 dB Jobes, which is bandwidth required to pass 99% of energy.
Filter Response Frequency scan :
0-100 MHz. Log display (LOG REF = 0 dBm). With 0 dBm test signal, passband insertion
and stopband rejection of 50 MHz bandpass filter are displayed. Insertion Joss is 3 dB, 3 dB bandwidth approximately 4 MHz and 60 dB bandwidth is 36 MHz (Shape factor = 9) .

There's only one lab tool that gives you the complete, accurate picture of measurements in the frequency domain: HP's series of fully calibrated spectrum analyzers. One covers 1 kHz to 110 MHz; the other goes from 500 kHz to 1250 MHz. Either is a convenient, easyto-operate basic instrument for general circuit design that enables you to make all the measurements you see on these pages, plus many more. Use it as a tuned voltmeter, a wave analyzer, distortion meter, frequency meter and power meter. Its absolute amplitude calibration, low distortion, high sensitivity, wide sweep capabilities and wide dynamic range make it a true multi-purpose frequency domain measuring instrument.
The analyzer displays absolute signal levels both in dBm and volts
from +lo dBm to <-120 dBm
(0.8V to 0.1 µ.V). And > 70 dB
distortion-free dynamic range permits exceptional accuracy in measuring complex signals.
Sweep the entire frequency range, then reduce the scan width for a closeup view of any portion down to .0002 % of the initial sweep. Selectable bandwidths let you get down to 50 Hz resolution with the lower frequency RF unit and to 300 Hz with the 1250 MHz unit. A variable persistence display shows the full trace even at the slow sweeps necessary to achieve high resolution.
You can perform all these measurements as easily as you operate your bench scope. Using HP's lab spectrum analyzers is simple and results are easy to interpret. The cost of the 8553B 110 MHz RF section is $2100; the 8554L 1250 MHz RF section is $3300. Either can be used with the basic 8552A IF section ($2050) and 141T Variable Persistence Display section ( $1 700) . There's a normal persistence display unit available, too. Your Hewlett-Packard field engineer has the complete details; or write to Hewlett-Packard, Palo Alto, California 94304; Europe : 1217 Meyrin-Geneva, Switzerland.

INFORMATION RETRIEVAL NUMBER 23

HEWLETT PACKARD
SIGNAL ANALYZERS
04005

Leners
You will be the ones out of step-not us
Sir: Mr. Jack J ones, in Letters, in
the March 15, 1970 issue (ED 25 ) , represents the myop ic, narrowminded sort of individual who, I fear, typifies the over-30 engineer. People like this, who can't see beyond the end of their slide rules, are precisely the reason why the engineering community has such a bad 1·eputation among a talented, soc ially aware yo un ger generation.
The United States is today in the midst of a revolution which must succeed if America or, for that matter, humanity itself is to survive. Whether this revolution is peacefu l or violent, orderly or chaot ic, wi ll to a large extent depe nd on how well established institutions respond to the crying need fo r extensive change. Recent experience, however , indicates that our estab li shed institutions-the electron ics industr y among t hemE:ither cannot or will not respond to this need.
Despite the ballyhoo over token efforts to attack real problems, the electr on ics industry remains heavily committed to weapons development. The reign of terror infl icted upon the Vietnamese people in the name of freedom is a direct result of American technology's eagerness to s upply the P entagon with every conceivable engine of destrn ct ion-at a handsome profit, of cou r se. As long as the electronics industry insists on maintaining its current cozy relationship with an arrogant, mindless military establi s hment, it will become increasingly difficult to recruit talented young people into the engineering profession.
Yes, Mr. J ones, today's youth is idealistic. And, as you suggest, we're also out of step. We are out of step with a war-based economy that squanders billions of dollars a nnu ally on useless, unreliable weapons systems for the Pentagon sandbox. We're out of step with :;u-called professional magazines and societies that glorify this toysoldi er nonsense a's be in g good business. or with the limp excuse

that it furthers scientific and tech-

nical "progess." We're out of step

with an economic phi losophy that

recognizes conspicuous consump-

tion as the on ly va lid measure of

national success. I cou ld go on, but

I think you get the idea.

Gentlemen, the days of "What's

good for General Motors is good

[or the country" are numbered. The

revolution is coming, and when it

does it wi ll be you who are out of

step and not us.

Douglas Abbott

University of Cali fornia

Berkeley, Calif.

Patent is pendingwe hasten to say
Sir: A minor, though urgent prob-
lem, occurred with the release of your feature article in Evaluation Samples, ED 6, March 15, 1970, p . 268, on our new packagin g system. Our intent with this a r t icle was to go on r ecord that the p rod uct was exclusive a nd that we had patents pending in the United States and many countries outside the U. S. as well.
It would be a great help if you could publi sh something as soon as possible, making it clear that the product line and product concept are exclus ively that of CircuitStik, Inc., and that a world-wide marketing line is planned.
Donald E. Harper Marketing Director Circui t-Stik, Inc. Gardena, Calif.

He calls attention to a lack of inversion
Sir : With regard to the article "Dia-
gram sequential logic on a cube" in t he 1 Mar. 1970 is ue, page 55, I believe you DID FORGET to paAu! the rear-left "A" CO STANT in your D cube in Fig. 3.
Wayne E. Snow Member Technical Staff North American Aviation Columbus Division North American Rockwell Corp.

From 31 components
you can make over
25,000 different
switches or indicators

Flexible, building block concept means low inventory investment. Arrow-Hart's name means top quality. And Authorized Specialty Switch Distributors (below) mean ready availability.

Arizona

Telephone

ELECTRO COMPONENTS

DISTRIBUTORS

602/258-2665

1641 E. McDowell

Phoenix, Arizona

California

T. V. WEATHERFORD 6921 San Fernando Road Glendale, California
ELECTRO COMPONENTS DISTRIBUTORS 122 So. Mission Road Los Angeles, California
FISHER SWITCHES, INC. 3381 Edward Avenue Santa Clara, California
FISHER SWITCHES, INC. 3400 S. Broadway Los Angeles, California
ELECTRO COMPONENTS DISTRIBUTORS, INC . 1667 Industrial Road San Carlos, California
CONSOLIDATED PARTS 180 E. Gish Road San Jose , California
ZACK ELECTRONICS 1422 Market Street San Francisco, California

213/849-3451 2 1 3 / 3 8 6 - 1611 408/244-6182 213/746-3740 415/ 592-3030 408/294-2302 415/626-1444

Colorado

ELECTRONICS PARTS
COMPANY 1277 Broadway Denver, Colorado

303/266-3755

I: ([/lllifllT1JII'lrj

ARROW-HART. INC. HARTFORD, CONN.

INFORMATION RETRIEVAL NUMBER 24 ~.

INFORMATION RETRIEVAL NUMBER 25

ELECTRONIC DESIGN 11 , May 24, 1970

Destroyer contract delayed again
Bath Iron Works and Litton Industries, which have been expecting for months to hear that one of them won the award to build six DD-963 class destroyers, may have to wait two more months for their answer. · The House approved $506.8-million for the ships but a rider was attached to the overall $20-billion defense author!zation bill requiring that the ships be built by two ship yards instead of one. The provision may be removed-as it was last year-by the Senate or later in joint House and Senate sessions. Meanwhile, the rider is holding up the contract award.
Action on the authorization bill may not· be completed before late June or July because it includes money for the Safeguard ABM, a program that will undoubtedly be delayed by a filibuster.

House votes $200-million for Lockheed 'contingency'
The House has approved $544.4-million for the C-5A program, $200million of which is to be used by Lockheed to cover expenditures during the next fiscal year. Lockheed told the Defense Dept. several months ago that it would need $600-million over the next three years to meet expenses. The House Armed Services Committee recommended the $200million for the coming year, stating that it was "doubtful" that Lockheed could cover these expenditures.
Deputy Defense Secretary David Packard told the committee that if the money was not approved, the C-5A program would have to be terminated under confusion and uncertain circumstances, without any clear picture of just what the Government would get for its large investment in the program.

Safeguard streaking toward trouble in Senate
The planned expansion of the Safeguard antiballistic missile system is in deep trouble in the Senate-and perhaps the entire ABM program along with it.
Senate supporters of the ABM system are not sure they can salvage any of the the program, let alone the $404-million earmarked for extra Safeguard sites. The House passed a $1,026,000,000 authorization for Safeguard in fiscal 1971, which included $305-million for construction of a new site at Whiteman AFB, Mo.; $35-million for additional Sprint missiles at Grand Forks, N. D., and Malmstrom, Mont.; $40-million for long-lead-time preparation of five additional sites, and $24-million for related work.
Last year deployment of the ABM squeaked through the Senate on a tie vote. This year proponents feel they will be lucky if they can even get a tie vote. One Senate supporter told ELECTRONIC DESIGN: "If they get us on the run, they'll kill the whole program."
Proponents point out that Sen. Everett Dirksen, a supporter, is dead and that Sen. Karl E. Mundt (R-S.D.) , another supporter, is hospitalized and not expected to be on hand for a vote. In addition there is little be-

ELECTRONI C D ESIGN 11 , M ay 24, 1970

Washington ReoorlcaNTINUED

lief in the Senate that Chinese attack capabilities call for extra ABM spending at this time. The plan within the Senate Armed Services Committee at the moment seems to be to bring out a modified bill that would kill the expansion but keep alive the basic program. Hopefully, say the proponents, this would get through the Senate and give the House a bill that it could live with.

Better planning sought in earth satellit e prog ram
The Senate Space Committee has instructed NASA to undertake immediately a study of other Government agency needs in the proposed Earth Resources Technology Satellite Program. The Committee told NASA it would like to see a formal agreement between Government agencies to improve planning and coordination. The recommendation came in the report of the Space Committee on NASA's fiscal 1971 authorization. The committee chopped $284.9-million from the $3.6-billion the House had approved. The bulk of the cut was in the manned space program, where the House had added almost $300-million more than the Admistration had requested.

AWACS contractor selection delayed
A contract award for the Airborne Warning and Control System (AWACS), expected in early June, has been postponed four to six months, Defense Dept. sources· say. No reason was given for the delay. But it's believed that a contractor for AWACS can't be selected until one is chosen for the B-1 advanced manned strategic aircraft. Announcement of the B-1 contract is imminent, and several of the bidders are involved in both contracts. Boeing and General Electric, for example, are both very much in the running for both contracts, and it's highly unlikely that pne company would get both awards.

Capital capsules: The Federal Aviation Administration (FAA) is taking a look

at a proximity warning device for general-aviation planes that costs less

than $400 and weighs only two pounds. The device, manufactured by

General Aviation Electronics, Inc., of Indianapolis, reacts to the trans-

ponders normally installed in military and airline aircraft . . . . Adm.

Thomas H. Moorer, Chief of Naval Operations, has revealed that two

North Vietnamese MIG fighters were knocked down in 1968 by Talos

missiles. Both planes were outside the 65-mile range of Talos. .News of

the downings was held up for security reasons, Moorer said . . . . The

Australian Parliament has agreed to lease U. S. Phantom F-4E fighters

as stand-ins for the 24 F-lllC planes it has on order, pending tests on

the grounded F-llls. The U. S. Air Force has announced, meanwhile, that

the F-111 wing under test at General Dynamic's San Diego facility failed

at 3,000 hours-1,000 hours short of its life expectancy. The Air Force

says, however, that the test has proved that the aircraft has many years

of use during which a fix can be devised .... The leading candidate for

the director of the new Office of Telecommunications Policy is said to be

William A. Niskanen, 37-year-old Pentagon economist and former director

of program analysis in the Institute of Defense Analysis. His deputy may

come from the communications industry.

ELECTRONIC DESIGN 11, May 24, 1970

SUB·PICOAMP lin FOR DIFF AMPS WITHFETS

Are these your requirements?- Less than 1 pA l in and low noise (for electrometer, Op Amp, or diff amp) or high slew rate (for sample and hold). Use FETs at the input in either long-tailed pair or differential source follower circuits. Another possibility -the temperature compensated source follower for unbalanced circuits.

e + 15

0 < 15nV/ (Hz @10 Hz

Av >23dB

OFFSET <5mV

1;0 < 1PA

Av > 0.96

OFFSET < 5mV

N5911
f3dB::::::::: 100MHz Av > 0.98 - 12 OFFSET < 10mV

Silicon ix assumes no responsibility for ci rcuits shown, nor does it rep rese nt or warrant that they do not infringe any patents.
Which FETs to use?· General Purpose: 2N5196-99; ·Low Noise: 2N5515-24; ·Low Leakage: 2N5902-09; ·Wide Band and/or High Gain: 2N5911-12.
For more information and applications assistance write or call any of the numbers below.

New York: Sy Lev in e (5 16) 796-4680 New England: Al La Croix (6 17) 762-8 114 Ft. Worth / Dallas: C ha rlie W illi a ms (2 14) 23 1-8 15 1 St. Louis: Jim Spicer (3 14) 291 -36 16 Minneapolis: Ed Koc lfge n (6 12) 920-4483 Southern California: Da vc Fe rra n (2 13) 420- 1307 Northern California: C huck Brush (408) 246-8000

Siliconix incorporated
220 1 La urelwood Road · Santa Clara · Cali fo rni a 95054 Telephone ( 408) 246-8000 Extension 20 I · TWX: 9 I0-33 8-0227
In Europe: Si liconix Limited. Saunders Way, Skell y. Swansea. G reat Brita in

ELECTRON IC D ESIGN 11 , May 24, 1970

SIDELIGHTS

New Infrared Detectors and Emitters.
Lead-Tin -Telluride Detectors for 8- 14 micron radiation. Optimum performance at 77°K. Peak spectral response can be selected. Available in various configurations.
Also available-a new family of high power, high efficiency gallium arsenide emitters. 150 milliwatts continuous outpuf at better than I0% efficiency. Substantially higher outputs achievable by cooling the diodes.

Shoot golf with pros - by computer
How'd you like to play an 18-hole round of golf on the famous course of your choice-without leaving your hometown? Our East Coast Editor, Jim McDermott, came across such an invention, called Golf-0-Tron. (Golf-0Tron Corp., New York, N. Y.) while gathering material for a story on the use of electronics in sports (page 36) .
An interesting hybrid-digital/analog-computer is used to control the practice game. The fairway is projected in color on a large screen in front of the player, who drives off the first (and succeeding 17 tees). His ball hits the screen, and from the impact, a computer calculates the trajectory the ball would have taken had our golfer been playing on the real course.
An image of the golf ball following this trajectory is projected on the screen. The computer measures the velocity of the ball and calculates the · yardage driven. The projector, controlled by the computer, automatically changes the pictures, as he progresses up the fairway, to correspond with the new position. Once the ball reaches the green, the player putts out on a grasslike surface with the real ball.
Other jobs the computer is undertaking in sports include picking new players for teams. It evaluates the prospects that team scouts report on. And computers are used also for analyzing opponents' games and players. In these cases, the machine makes a statistical analysis of important factors, and the results are printed out for the managers' and coaches' evaluation.

Raytheon produces IR detectors covering the spectrum from 2 microns to 8 mm. Both single elements and arrays have been produced.
lnSb Arra Dewar Assembly and Cryostat

INFORMATION RETRIEVAL NUMBER 26
50

With the Golf-0-Tron practice machine, a player is about to make an iron shot to the hole 50 yards away-on the screen.
fNFORMATION RETRIEVAL NUMBER 27 ~

TRIAL and
ERROR
eliminated with di1ita111 controlled power

210 0 6

POWER SUPPLIES
100 Locust Avenue, Berkeley Heights New Jersey 07922 · (201) 464-1234

... The most advanced instrument for automatic test systems ... designed to save you engineering time and money. HP Digitally Controlled Power Sources are more than digital-to-analog converters with output power capability, they include added "system-oriented" functions ... Internal Storage to increase computer operating efficiency; Isolation to break ground loops; Bipolar Amplification for fast up and down programming; Programmable Current Limit to protect sensitive loads; Pre-Interfaced at the factory to match your computer ... All this is in a single compact package. Outputs from -100V to +100V, currents up to 1A. $1,800.
Dlgltally Controlled Power Brochure available upon request.

DOW CORNING DOW CORNING DOW CORNING

Dow Corning® silicone sealants and protective coatings are the only ones that do not release acetic acid or other corrosive by-products during cure. They were specifically developed to protect delicate circuit boards and other electronic components from corrosion, dust, dirt, abrasive particles, solvents and chemicals. They are strong, have excellent bond strength, electrical strength; are easy to apply, and cure quickly. There's no "vinegar" smell, either. Dow Corning 3140 (clear) and 3141 (opaque) ATV coatings are ready-to-use silicone rubbers that cure at room temperature. They are ideal for conformal coatings on printed circuit assemblies or for encapsulating small circuits or connectors. Dow Corning 3144 (clear) and 3145 (opaque) ATV adhesive/ sealants are high-strength, noncorrosive, nonflowing silicone rubbers used to bond components and seal housings and connectors.
Stop component corrosion with these Dow Corning coatings and sealants. For more information, write Dow Corning Corporation, D.ept. B-9342, Midland, Michigan 48640.
Electrical I Electronic
materials from
DOW CORNING
INFORMATION RETRIEVAL NUMBER 28

Process more information faster and cheaper with HP hot carrier
diodes.-~

Now you can think about circuit switching speed in terms of picoseconds instead of nanoseconds, for digital logic systems, data handling and peripheral equipment and other applications where you're designing circuits for mixing, clipping, clamping, AID conversion, gating and sampling.
These low-cost hybrid Schottky diodes are fully passivated, have a 0.4 V threshold voltage, have

100 picosecond switching speed and 1.0 mV/degree C temperature coefficient. They'll withstand temperatures from -5 5° to 200 ° C and breakdown voltages up to 70 V. In fact, their near-ideal combination of forward voltage/current characteristics adds up to better-than-PNjunction performance at volume user prices. And they're newly EIA registered.

INFORMATION RETRIEVAL NUMBER 29
54

Check your HP sales office for prices, which are as low as 32¢ each in 100,000 quantities for the HP 5082-2800. Ask about specs and prices on the HP 5082-2810 and 2811, too.
.01008
SOLID STATE DEVICES
ELECTRONIC DESIGN 11 , May 24, 1970

00 00

o0o0

00
00
00
00

00
00
0o0o

Wi··lll!lll!r El··lr··i·I where in-stock printed circuit connectors are closing today's communications gap.

Typical of Winchester Electronics' capabilities in

MIL-C-21097 requirements but exceed them in

printed circuit connectors are our lines of card

quality and reliability at an economical price.

edge and board joiners pin and socket connector.

And for even more exacting applications, our

So, before you go to the expense of ordering a

military approved HB/HBD series.

special printed circuit connector, look into the

in-stock selection at Winchester Electronics. Just

Available in single and double row terminations, these
LrllOll E\NLIENCCTHREOSNTIECRS connectors not only meet

write Winchester Electronics, Main Street and Hillside
Ave., Oakville, Conn . 06779.

DIVISION OF LITTON INDUSTRIES

INFORMATION RETRIEVAL NUMBER 30

ELECTRON IC D ESIGN 11, May 24, 1970

Sfast
ways to
design-in
transformers.

O-1~ MAX T
T
15
32
1'
I \J
WEIGHT 1/10 OZ
00-TTM Transistor Transformers & Induc-
tors with frequency response of ± 3db,
300 Hz to 20 kHz. Primary im pedance ranges from 80 CT to 200,000 CT; secondary impedance from 3.2 to 20,000 split. Mw levels from 25 lo 500. Inductors
from .15 Hys @ 20 moDC to 6 Hys @ 2
mo DC.

Q.f.

,,.,...,,

9 IGMAX

q
.......

Q:"'

::JVl

.... u. (/) u.
60

1··.4!.

:::> Q: <II~
.....Q:
,.. Q:

""'

WEIGHT 1/15 Ol
New OO-T200TM Series Transformers & Inductors. Termination patterns conform with T0-5 cosed microcircuits. Frequency
response, ± 3db, 300 Hz to 20 kHz. Pri-
mary impedance ranges from 1,000 CT to 200,000 CT; secondary impedance from 50 to 12,000 CT. Mw levels from 25 to 100 . Also available in all standard DO-T specifications.

13MAX
32

.......

CZ:IM

.:.>..C..l.>.
"6'"0-

1·-.4!.

:IECZ:
.....<II~ Q: >Q:

""'

WEIGHT 1120 Ol
PILTM Ultraminiature Audio and Highfrequency Transformers & Inductors. Fre-
quency response ot 1 mw is ± 3db, 800
Hz to 250 kHz. Primory impedance, 500 CT to lOK CT; Secondary impedance, 500 CT to 2K CT. Mox. Mw level, 100. Inductors from .020 Hys @ 10 moDC to .66 Hys @ 0 moDC.

WEIGHT l/150Z
01-TTM Series Transistor Transformers &
Inductors. Frequency response of ± 3db,
400 Hz to 100 kHz. Primary impedance ranges from 80 CT to 30,000 CT; secondary impedance from 3.2 to 12,000 CT. Mw levels from 50 to 500. Inductors from .08 Hys @ 10 mo DC to 4.5 Hys @2 mo DC.

WEIGHT 1/15 OZ
Ol-T200TM Transistor Transformers & Inductors. Termination patterns conform with T0-5 cosed microcircuits. Frequency
response, ± 3db, 400 Hz to 100 kHz. Pri-
mary impedance ranges from 80 to 30,000 CT; secondary impedance from 32 split to 12,000 CT. Mw levels from 50 to 500. Inductors from .02 Hys@ 20 moDC to 4.5 Hys @ 2 moDC. Also available in all standard Dl-T specifications.

Here is the entire UTC DO-T family. Pick any one of these transformers
-you'll combine maximum performance characteristics, unusual power handling capability and high reliability in a tiny package. Their parameters greatly exceed those of conventional transformers, making them ideal for a wide range of applications.
All of these transformers hove the unique DO-T type construction that UTC developed. The bobbins are
56

completely rigid, eliminating stress and wire movement. All turns ore circular, rather than square, eliminating turn corner stress. All leads and wires are securely anchored to resist strain.
All units are hermetically sealed and are manufactured and guaranteed to MIL-T-27C specifications.
Insist on getting UTC transformers in these five basic series. Simplify your design problems-refer to the UTC catalog, which displays the largest
INFORMATION RETRIEVAL NUMBER 31

selection of items in the industry.

Standard items are available for im-

mediate delivery-plus custom designs

to your specifications.

Contact your local distributor. Or,

write for latest catalog to United Trans-

former Company,

Division of TRW, INC.,

150 Varick Street, New

I I

York, New York 10013 .

TRllK

INFORMATION RETRIEVAL NUMBER 32 ...

BEBE'S WHY:

· ± 0.01 % line & load regulation · ± 0.5% preset output voltage ·Short-circuit proof · MIL-STD-883 hermetic package · $40 (1-9 quantity) ·Model 828 (plus) and Model 838 (minus)
from stock ·Many other outstanding features ;
contact your local Helipot representative.

Beckman ·
HELIPOT DIVISION
FULLERTON, CALI FORNIA· 92634
INTERNATIONAL SUBSIDIARIES· AMSTERDAM. CAPE TOWN GENEVA . GLE NROTHES. SCOTLAND; LONDON. MEXICO CITY MUNICH. PARIS, STOCKHOLM. TOKYO: VIENN"

DUAL TRANSISTORS

THEIRS r URS

SURE A METAL CAN IS HERMETIC.
BUT IS IT WORTH A $7.00 PRICE DIFFERENTIAL?
Sprague thinks not. In 9 out of 10 industria l and instrument applications, it's beta match and VsE tracking that count in a dual transistor. Not the can. That's why we package in plastic. So you can save dollars on your design. With no loss in performance. Just like with ICs, where plastic DIPs are almost the rule . It's just that simple.

Now you can get what you need ; the specs. Without

paying an arm and a leg for a metal can. Look over

the table of types. The specs check. And the price is

$0.92 to $2.40 at 100-999. So pick up the phone to

save a pocketful of dollars.

·f

Iv..,_v,., I

5mV

lOmV

NPN /N PN TD-100 TD-200 TD-250

TD-101 TD -201

I I VH16

Vr.u2

lOµV /'C 20µV /'C 30µV /'C

Matched Duals

Pinning

c c 0 0 0 0 0 0

E I

E B

000 000

TD-250

TD-100 TD-200

TD-101 TD -201

TD - 2 2 1 9

TD-200 TD-201 TD - 2 0 2 TD - 2 5 0

TD - 1 0 0 TD- 10 1 TD- 102 TD-22 19

PNP / PNP

TD - 4 0 0 TD - 5 0 0 TD - 5 5 0

TD -401 TD -501

TD-550

TD-400 TD - 5 0 0

TD-40 1 TD-501

TD-2905

TD - 5 0 0 TD-50 1 TD-502 TD - 5 5 0

TD - 4 0 0 TD-4 0 1 TD-402 TD-2905

PNP / NPN

TD-600 TD-700 TD-600

TD-601 TD-602

TD-701 TD-60 1 TD-702 TD-602

TD - 7 0 0

TD-70 1

TD-702

PRICE? DELIVERY? LOCAL DISTRIBUTORS? TECHNICAL LITERATURE? GET THE ANSWERS AT ANY OF THE NUMBERS LISTED BELOW.

4SS·ll1 88 "3

ALA. Huntsville, no charge call operator, WX4000 ARIZ. Phoenix (602) 279-5435 CALIF. Burlingame (415) 347-7701 Los Angeles, Bell Tel., (213) 870-0161, Gen. Tel., (213) 391·06ll San Diego (714) 278-7640 COLO. Denver (303) 756-3611 CONN. Trumbull (203) 261-2551 DC. Washington (202) 244-6006 FLA. Orlando (305) 831-3636 ILL. Schiller Park (312) 678-2262 IND. Indianapolis (317) 253-4247 MASS. Newton (617) 969-2520 North Adams (413) 664·44ll MICH. Ann Arbor (313) 761-4080 Detroit, no charge call opera· tor, Enterprise 7498 MINN. Minneapolis (612) 335-7734 MO. St. Ann (314) 291-2500 N.J. Cherry Hill (609) 667-4444/(215) 467-5252 Wayne (201) 696-8200 N.M. Albuquerque (505) 265-1579 N.Y. Melville (516) 549-4141 Syracuse (315) 437· 73ll N.C. Winston-Salem (919) 722-5151 OHIO Chagrin Falls (216) 247-6488 Dayton (513) 223-9187 Cincinnati, no charge call operator, Enterprise 3-8805 TEX. Richardson (214) 235-1256 WASH. Seattle (206) 632-7761.

SPRllGUE
THE MARK OF RELIABILITY

INFORMATION RETRIEVAL NUMBER 823

ELECTRON IC D ESIGN 11 , May 24, 1970

YT19 system cabinet, holds all the equipment shown (except teletypewriter) with room to spare. CD51 controller-digitizer with programmable gain, controls 1024 channels, 10ns aperture time. TE33 teletypewriter with paper tape reader and punch. (Includes controller.)
CF16 minicomputer with a 4K x 16-bit memory (expandable to 24K) and four different 1/0 modes. (Includes software.)

Optionally

available:

MR50 hlgh-

level multi-

plexer and associated

:::;;

channels (approxi-
mately $2400 extra), if you

'11 (!ifffiTJV'?

want to mix

high and low

level signals. Also

10, 12or 15-bitDtoA

converters for closed

loop systems, and a

variety of other off-

the-shelf instru-

ments and op-

tions to solve

virtually any

data acquisi-

tion problem.

PE20 peripheral controller for CD51 /DM40 combination.
OP50 multiplexer switch card contains 8 switches with screw terminals. Each DM40 accommodates up to 16 such cards. Switch cards with other terminal types also available.
OP59 power supply for up to eight DM40s.

DM40 low-level differential multiplexer accepts up to 128 input signals (optionally expandable to 1024) in the range ±2.5mV to ±10V full scale, at a rate up to 20kHz, and
XIaI5 with a CMR of 120db at DC.
bAell cinasbtirnuemt emnotsunatneddinatnedrffaucnecstiwonil-l a 11 y tested together prior to
delivery. If you're in a hurry, call XuoxOataSustans (213) 679-4511, ext. 3668 or 3391. e5Egundo.cal4fomla

The last reason you should buy our data acquisition system is the price: $21,600.
INFORMATION RETRIEVAL NUMBER 33

A,ULSE

SNAP DIODE
lrom SlllCONll. ISlllCONIX iiI*
Here's a semiconductor diode that can really put a snap in your pulse circuitry. It can handle high amplitudes at picosecond speeds, all with simple, low-cost circuitry.

LEADING EDGE

TYPICAL APPLICATION: PULSE SHARPENER

TRAILING EDGE

o l---------<1..-----00
einlf ~t PSD e,LL.t 00 Transition times: less than 500 pS. Amplitudes to JOO V.

Other uses for this pulse snap diode include · Pulse Squaring · Pulse Delaying · Pulse Area Limiting · Impulse Generation · Sine-toSquare Conversion · Etc.

Instant data and applications information available from any of

the offices below. Just write or call.

*. a new addition to the

expanding family of high speed,

New York: Sy Lev in e (51 6) 796-4680 New England: Al La Croix (61 7) 762-81 14

HF and microwave devices from:

Ft. Worth / Dallas: C harlie Williams (214) 231-8151 St. Louis: 1im Spicer (314) 29 I -36 I 6

Siliconix incorporated

Minneapolis: Ed Koe Ifgen (612) 920-4483

2201 Laurelwood Road · Santa Clara · California 95054

Southern California: Dave Ferran (2 13) 420-1 307 Telephone ( 408) 246-8000 Extension 20 I · TWX: 910-338-0227

Northern California: Chuck Brush (408) 246-8000 In Europe: Si liconix Limited. Sa un ders Way. Skell y. Swansea. Great Britain

INFORMATION RETRIEVAL NUMBER 34

INFORMATION RETRIEVAL NUMBER 35 ....

That little black box is a power amplifier with 150 watt output

We said
one hundred fifty
vvatts!

This little beauty is the smallest power amplifier capa-

ble of 150 watt output and 100 watt interna l dissipation

·at 90°C case temperature. It's uniquely suited and priced

to drive industrial control systems using DC torque

motors, servo motors or for directly activating loud

speakers, actuators, sonar transducers and TV magnetic

deflection circuits.

Why try to duplicate lnland's years of experience in

designing, specifying and manufacturing control sys-

tems from command signal to

final drive. We can save you time

and money by solving your inter-

face problems before they occur.

And you get 2 weeks delivery.

The IC-100 is field repairable

and can be configured to meet

MIL-E-5400 including MIL-STD-

704. For further information in-

cluding quantity pricing, just give A o 1 v 1 s 1 o N o F

us a call or drop us a line.

KOLLMORGEN

_ _ _ _ _ _ ___.._ _ _ _ Inland Controls, Inc. 250 Alpha Drive , Pittsburgh, Pa . 15238 Tel: 412-782-3516

~o everheard
ofa computer
with an

Unlike any other computer you've ever seen, the GRI 909 Computer, a Direct Function Processor, has

an expandable instruction set. Starting with the basic configuration of nearly one hundred instructions, it can be expanded with firmware modules to literally thousands of instructions.

Typical units in our standard library of plug-in firmware operators are "Multiply/Divide" "Byte Swap/ Pack", "Byte Comparator" , and "General Purpose Registers". And, if you prefer, you can make up and plug in your own proprietary operators.

This is a true hardware expansion of the processor unit ... not merely a read-only memory execution of subroutines. (Although the GRI 909 can handle that

too, of course.)

Don't box yourself in. Get the GRI 909. It's a family of computers within a single processor unit.

For more information on the Direct Function

Processing technique write :

GRI Computer Corp.

~ 76 Rowe Street,

D I

Newton, Mass. 02166

* (617) 969-7346 EXPANDABLE PROCESSOR UNIT

INFORMATION RETRIEVAL NUMBER 36

INFORMATION RETRIEVAL NUMBER 37 ....

CELANESE NYLON IS
.MADE IN A TOTALLY CONTINUOUS PROCESS.

THAT'S ADVANTAGE NO. l.

Whiteness. We make Celanese®

guishing. And it has U/L rat-

Celanese nylon in a continu-

ing on electrical properties of

ous, patented process-so it

105 °C.

has a shorter heat history.

In fact, Celanese nylon has

That's why it's whiter in the

all the best properties you ex-

pellet. Whiter in your prod-

pectin nylon. Without the yel-

ucts. And it's whiter through

low. Write for a copy of our

successive regrinds.

brochure on electrical applica-

It's one advantage that

tions of Celanese nylon. Also

Buchanan Electrical Prod- dielectric properties, which a U/L Yellow Card. Celanese

ucts Corporation gets by us- allow thinner walls, more Plastics Company, Dept.

ing Celanese nylon for compact units. Greatmechan- N-500,

terminal blocks, connectors- ical strength and toughness. 1090 Lousons . .

some 30otherelectrical parts. Resilience, for parts that Rd., Union,

Other reasons for using have to snap-fit. Hold. New Jersey

Celanese nylon include high Celanese nylon is self-extin- 07083.
Celanese Plastics Company is a division of Celanese Corporation . Canadian Affiliate: Chemcell Resources, ltd . Export: Amcel Co., Inc ., and Pan Ame.el Co., Inc., 522 Fifth Ave., New York 10036.

CELANESE PLASTICS

EA 3000 I 2304 Bits

Features:

1. Fast-guaranteed maximum access times : 850 nsec to 1.5 µsec.
2. Low Power-90 mW typical. 3. Complete decoding within each ROM. 4. Wire-OR capability. 5. May be biased to be bipolar compatible . 6. Synchronous and compatible . 7. 24-pin dual-in-line packages.
Standard Patterns
available today at EA distributors
1. EA 3001-Starburst character generator and Selectric bail to ASCII code converter.
2. EA 3101-ASCll to Selectric Line Code and Selectric Line Code to ASCII code converter.
3. EA 3307-ASCll to EBCDIC and EBCDIC to ASCII code converter.
4. EA 3501-Row Scan Dot Code Matrix Character Generator.
5. EA 3701-Column Scan Dot Code Matrix Character Generator.

EA 3500 I 2560 Bits
Custom Patterns
Any EA ROM can be programmed to your specialized bit patterns. Allow 6 to 8 week delivery. For data sheets and forms for submitting your specialized bit patterns, contact your local representative or write Electronic Arrays, Inc., 501 Ellis Street, Mountain View, California 94040. (415) 964-4321.
[H1]
e1ec1ron1c arrays, Inc.

PROVEN MOS PRODUCTS DELIVERED IN VOLUME

INFORMATION RETRIEVAL NUMBER 38

ELECTRONIC DESIGN 11, May 24 , 1970

with RCA Microwave Devices designed for telemetry

Build into your telemetry system all the advantages of size, weight, power, economy, and shock cap ability with products from a single source-RCA.
For more than two decades, RCA has manufactured devices in high volume for use from low Lband all the way to Ku-band.
Today RCA offers products for such diverse applications as : radiosondes, missile guidance, shell telemetry, joint inflight data systems, weather observations, pollution control , and experiments in bio-medical research , stress, environment, pressure, temperature, and mapping with the help of infrared.
In outline, these are some of the RCA devices available for your airborne and ground-based telemetry systems: D L- and S-band-Pencil Tubes and Cavities, Transistor Power Sources, Oscillators, Microwave In-

tegrated Circuits-for applications from 250 mW cw to 600 W peak. D S-band-High Power Transistor Amplifiers, Microwave Integrated Circuit Modules-in 5 W to 10 W systems. DC-, X-, and Ku-band-TEO 's, Oscillators, Microwave Integrated Circuits-for use in the 100 mW range. D Wideband-Traveling-Wave Tubes for low and medium power applications up to 20 W.
For more i nformation on RCA products available for your telemetry requirements, see your local RCA Representative. For technical data, write: RCA Electronic Components, Commercial Engineering, Section E52-2/ZM7, Harrison, N.J. 07029. In Europe : RCA International Marketing S.A. , 2-4 ~!!!!,~ rue du Li evre, 1227 Geneva, Switzerland.
non

ELECTRO IC D ESIGN 11, May 24, 1970

So what if Grant Slides save
hours of down time?

Is there a quicker, more efficient way to get to a fault locatio
by immediate and smooth e of the unit for simple, fast
Would you guess the

How great is the value of slides if individual chassis' can be
interchanged with similar chassis' in moments?

What's it worth if slides enab} equipment to be serviced in half
-or less than half the time it ordinarily takes bolting and unbolting,
fastening and unfastening?

Virtually every product can use the ready access provided by Grant Slides. There are
thousands of types, styles and sizes available. Slides that tilt, lock, extend and lock and
perform dozens of other functions. Undoubtedly, there's a Grant Slide that can help make
your product better too.

EASTERN DIVISION: WESTERN DIVISION:

Write for complete data.
GRANT
PULLEY & HARDWARE CORPORATION
21 HIGH STREET, WEST NYACK, NEW YORK 10994 944 LONG BEACH AVE ., LOS ANGELES, CALIF. 90021

INFORMATION RETRIEVAL NUMBER 39

INFORMATION RETRIEVAL NUMBER 40 ...

Each Sylvania 7400N package is guaranteed to meet a hermeti cit y specification of 1x10- 7 cc / sec,
2% AQL. W e make this guarantee because
of the superior construction of our Cerdip package.
And you don't pay anything extra for this added feature; in fact you pay less. The price on our Cerdip 7400N devices is no higher than competing plastic units.

This guarantee of hermeticity Sylvania 7400N devices are at

applies to all 14 devices in our your distributor right now. You

present off-the-shelf line and will don't have to worry about prob-

apply to 13 additional 7400N TTL lems with plastics when you can

devices we will announce in the get our guaranteed Cerdip packs,

near future.

and save money, too.

We're pretty proud of this guar- Sylvania Electronic Compo-

antee and we are putting it on our nents, Semiconductor Divi-

data sheet just as we do with elec- · sion, Woburn, Mass . 01801.

trical specs. This is a major commitment to

SYLVANIA

improved reliability.

GENERAL TELEPHONE & ELECTRONICS

Guaranteed*hermeticity

in every package.

That's why you need 9th-sourcing in 7400N TTL.
~These integrated circuit s are guaranteed to substantially conform to Sylvania's applicable specifications and be delivere d free of defects in materials and work m anship. If they are d efective in such respects, at Sylvania's election, Sylvania will either repair, replace or grant a credit at invoice prices it defective integrated circuits are returned to t he factory pre. paid wi thin one yea rafter shipment. THESE GUARANTEES ARE IN LIEU OF ALL OTHER GU ARAN TEES EXPRESSED OR IM PLIED. Svlvania shall not be liable for ~OAr.ial nr"nnc·nu· n"·' -' · ~·n·· ·· .... --···-·

WE WANT OUR NAME ON THE TIP OF YOUR TONGUE!
~.~g~.~!l~~r 3m
INFORMATION RETRIEVAL NUMBER 41

small wonders: big news
Denser PC packaging at low cost is now possible .. . thanks to CAMBION's low-profile standard variable inductors. They're wound on new, thin wall coil forms that allow higher Q's and inductance values.
Ultra-reliable as well as miniature, these high performance inductors are built for longer life .. . longer by a factor of ten in tuning torque. They have an operating temperature range of -55° to 125°C and a tuning range of ±20% from the mean inductance.
For total circuit reliability - at a small price - it pays to choose CAMBION inductors. They're available in a wide choice of values, sizes, styles and finishes for immediate delivery.
Cambridge Thermionic Corporation, 445 Concord Ave., Cambridge, Mass. 02138. Phone: (617) 491-5400. CAMBION Electronic Products, Ltd., Castleton, Near Sheffield, England. Phone: Hope 406/ 407.
Standardize on
CIJ_.BIO.~
The Guaranteed Electronic Components
INFORMATION RETRIEVAL NUMBER 42
68

Grayhill Miniature Push Button or Rotary Switches with PC Terminals

I Push Button PC Switches · Rated 'I· Amp . - 115 VAC Resistive · 2 Circuits - One NC, One NO Can Be W i red Far SPOT · Flush Or Stand -Off Mounting

Rotary PC Switches

· 30° , 36° , 45° ar 60° Angle Of Throw

· 2 ta 12 Pasitians Per Pole

· 1 ta 4 Pal es Per Deck · 1 to 12 Decks
·Totally Enclosed
· Shorting Or Nan-shorting
l · Commercial Or Military

For yaur Grayhill Engineering Catalog offering complete technical data-contact

I ~

565 Hillgrove Avenue

y,,!.i// LaGrange, Illinois 60525

~ Area Code 312, Phone 354-1040

. . . the Difference Between Excellent and Adequate

INFORMATION RETRIEVAL NUMBER 43 ELECTRON IC D ESIGN 11 , M ay 24, 1970

The MAN 1:
A seven-segment light-emitting all-semiconductor alphanumeric readout.
Put the .attention-demanding red light from electrically excited GaAsP to work in your digital displays for industry, computer peripherals, or avionic/marine instrumentation. Our MAN 1 is shock-resistant and long-lived. Offers styling advantages because it's flat, parallax-free and visible within 150° . Reads out all numbers plus A, C, E, F, H, J, L, 0 , P and U. Available now. Any quantity. · Brightness: 350 foot-Lamberts @ 1·=20 mA, 3.4V, per
segment. · Pulsed forward current=100mA, 10% duty cycle/ per
segment. · Compatibility: directly interfaces with off-the-shelf IC
d e c o d e r/ drivers . · Price : 1,000 quantities, $11 .00 (all prices are suggested
resale figures).
The MAN 2:
An alphanumeric display made up of 36 discrete LEDs which can form 64 ASCII characters and a decimal point.
The IC-compatible 5 x 7 X-Y array gives you a bright red (peak emission 6500A), high contrast display suitable for keyboard verifiers, avionics or computer terminals or other displays. Since the 36 dots can make 2·· bits available, the MAN 2 can be very useful in film annotation work. · Per-diode brightness : 300 foot-Lamberts @ 1·=10 mA,
1.7 volt per diode. · Pulsed forward current (50 µsec 20% duty cycle) 100 mA · Light turn -on and turn-off 5 ns typical · New reduced price: 1-9 quantities, $40.00.
GaAsLITEs are in stock world wide.

GaAsLITE Update
Being a quick and thorough survey of what's available in solid state displays.

The MAN 3:
The world's first commercially available planar monolithic displav. low cost, besides!
The MAN 3 is a small (.125" high) bright red GaAsP sevensegment display that gives you extremely good v isibility with high density packing; 16 di gits need only 3 inches on your display. And since the MAN 3 interfaces with our standard IC drivers and uses as little as 10 mW per segment, it's simple to design numerical readouts into desk calculators, truly portable battery-operated instruments, even timepieces. · Brightness : 200 foot-Lamberts @ 1·=5 mA, 1.7 volt, per
segment.
· Total cont. forward current : 80 mA.
· Pulsed forward current=50 mA, 10% duty cycle per segment.
· Price : 1,000 quantities, $7.55.

0 0 0

123

·~

,-
.='I

18 g

MPC 1 MPC 2

MPC j

We've mounted the MAN 3 for you

Our MPC-series are simply the new MAN 3 numerics carefully soldered to NEMA-grade G-10 copper-clad glass/epoxy laminate pc boards.

You know that all of our products are available in the U.S. through Schweber (516) 334-7474; Semiconductor Specialists (312) 279-1000 ; K-Tronics (213) 685-5888 ; or Kierulff. You can get them overseas as easily:
United Kingdom : SEMICONDUCTOR SPECIALISTS, West Drayton 6415
France: YOUNG ELECTRONIC, 604-10-50 West Germany: Alfred Neye, ENATECHNIK, (04106) 4022 Denmark : SCANSUPPLY, AEGIR 5090 Belgium: TECHMATION, 384078 Netherlands : TECHMATION , 020-173727 Norway: ARTHUR F. ULRICHSEN A/S, 21 6510 Switzerland: OMNI RAY A.G ., 051-478200 Italy: SILVERSTAR LTD., 46.96.551 Sweden : GP-INGENJOERSFIRMAN , 08/930280 Japan : NEW METALS AND CHEMICALS LTD. CORP., (201)
6585-7 Australia: HAWKER DE HAVILLAND AUSTRALIA PTY.,
LTD., 93-0221 Israel : MONSEL

The MPC 1 and MPC 2 boards let you address each segment of the numeric independently. Th e MPC 3 holds six MAN J's which are multiplexable (X-Y addressable) . Th ere are two major benefits in doing your prototype work w ith our MPC units : 1) they' re a heck of a lot easier to breadboard and 2) yo u can use them for fast turnaround into full production . Send for complete details. Fast! Price, MPC 2: 1 to 9, $35.80 ea.
Monsanto
For additional technical information write Monsanto Electronic Special Products, 10131 Bubb Road, Cupertino,
California 95014. (408) 257-2140.

INFORMATION RETRIEVAL NUMBER 44

E LECTRONIC D ESIGN 11, May 24, 19 70

It decodes, level shifts and gates! It's in stock! Right now! Order for your requirements now. Computer Microtechnology Inc. is shipping from stock the CM1400 3 bit binary to one of 8 line decoders. It is a bipolar integrated circuit with standard TTL inputs and special output circuitry with high level signals for driving MOS devices. Many of your system functions can be performed by using the CM1400 decoder. You will find it ideally suited for address decoding and level shifting in MOS memories, gating low level MOS multiplexers and general high speed decoding applications. Two chip inhibit inputs are provided for easy expansion. Computer Microtechnology Inc. continues to supply products that increase the capability of memory systems. The CM1400 decoder illustrates this with its high speed and other excellent characteristics. Check the specs.

CM1400 3 BIT BINARY TO ONE OF 8 LINE DECODER
Propagation Delay ..... 50 nsec typ, 100 pf load
Power Dissipation, AC and DC ........ . 140 mw typ,
+5 and +10 v
Output High Voltage ..... 9.5 V typ, -0.l mA
Packaging .. . . .. 16 lead dual-in-line
Price ............ .. ... $15 .25, 1-24
Delivery ..... . .... . ... .. ... . Stock
Order yours today! They're in stock!

([]]]computer Microtechnology,Inc

CM AREA OFFICES

Plant

East

West

610 Pastoria

10 Dale Street

1627 Pontius Avenue

Sunnyvale , Calif. Wa ltham , Mass . 02154 Los Angeles, Calif. 90025

(408) 736-0300 (617) 891-0002

(213) 478-1285

INFORMATION RETRIEVAL NUMBER 45

ELECTRON IC D ESIGN 11 . May 24. 1970

' .

calibrcdion

and measurement

in one instrument.

co"··'A"N' D

8296 CALAIBCR/DACTION
ttFSt..T..A..N,..D...A,_R_D...,,,_.,,...,,.,,,,,,u.sA.

l!SIT
·

l:UN -UP
\. OH.., AMPlllUOE LUM!~

Model 829G
The best of both worlds

Now you can take advantage of the unique RFL Model 829G Universal Calibration Standard - a new, doubly useful instrument that provides a precision source of AC and DC volts, amps, ohms, - plus precision measurement of these parameters from external sources . . . with 5-digit read-out.
The new 829G replaces the famous 829 series, for l 5 years the industry calibration

standard. Take a lo:Jk at just some of its capabilities:
AC or DC voltages in 5 ranges, 0.1 V to l OOOV. Currents in 6 ranges, l OOuA to l OA. Ten precision resistance values, 0.01 ohm to l 0 meg. AC frequencies: 50,60,400, l 000 Hz and EXT. AC Watts capability when locked to another AC source. Four-terminal sensing in both source and measurement modes, plus high accuracies, high

resolution, and high output regulation. And all this priced at what you'd expect to pay for a calibrator alone. You can't afford not to have itthe cost $3 l 00.00. Write for complete data today.
RFL Industries, Inc. Instrumentation Div. Boonton, N. J. 07005. Tel.: (201) 334-3100 I TWX: 710- 9878352 I CABLE RADAIRCO, N. J.

~ RFL Industries, Inc:

INFORMATION RETRIEVAL NUMBER 46

RUBBERIZED ABRASIVES

COMPLETE KIT $750
CONTENTS: 8 tapered edge wheels 54" dia. 1 ~ 1 "; 16 cylinder points 1/." dia . 1 ¥1 " lone; 16 bullet points %1" dia. 1. l" long; 8 bullet points :Ya" dia . 1 %"lone; 8 straia:ht whHls l/z" 1 1/1" 1 Yi 6" hole; 16 straight wheels ¥1" 1 1/1" 1 Y16' hole; 8 straicht wheels l" 1 ¥16" 1 V. 6" hole; Z wheel mandrels 1/1" shank; 2 point m1narel1 1/a" shank. For use at spHds up to 25,000 RPM .

$7 .50 BUYS IT All - 80 piece introductory Kit 777 equally assorted in 4 grit textures: coarse , medium, fine and extra fine . TRY IT - Cratex Rubberized Abrasives improve the surface while pre · serving crit ical workpiece dimensions by its unique cushionin g action . FINISH THE JOB- to your most exacting specifications-often in a single operation . SEND FOR KIT 777 - or your FREE SAMPLE and catalog illustrating the foll Cratex product line and its applications .

,.nA .,.~v® RUBBERIZED
&,Kit/ /;;A ABRASIVES
1600 Rollins Road · Burlingame, California Sold through leading industrial distributors

INFORMATION RETRIEVAL NUMBER 47

Less than $30in Production Quantities
FEATURES:
· Output-15,000 voe@ 150 ,,A · lnput-15 voe
· Short Circuit and Reverse Polarity Protected · Fully Encapsulated · Volume only 18 cu. in.
VS/ also manufactures a com]Jlete line of high voltage Power Sllp]Jlies for I mage Intensifiers and Cathode Ray Tubes.
Send for brochllre today.
VENUS SCIENTIFIC INC.
399 SMITH STREET, FARMINGDALE, NEW YORK 11735 · (516) 293-4100
See us at Booth 17/SID Show
INFORMATION RETRIEVAL NUMBER 48
72

Stops on a diine ...
High Performance DC Motor jumps to full speed faster . . . stops quicker ... than others its size because it has lower inertia. Produces pulse torques up to 10 times rated torque. For either open or closed loop systems.
Options: Tachometers, special shaft lengths and shapes, forced air cooling adaptations.
Get the complete story from your MICRO SWITCH Branch Office.
Or write: MICRO SWITCH
FREEPORT. ILLINOIS 61032
A DIVISION OF HONEYWELL
INFORMATION RETRIEVAL NUMBER 49
ELECTRONIC D ESIGN 11 , May 24, 1970

Tackle box
Contains a full line of work-together electronic materials to tackle any job.

OWENS-ILLINOIS, INC., Electronic Materials, Customer Service Mgr., Dept. E-5. P. 0. Box 1035, Toledo, Ohio 43601

Please send me literature on:

O Package Sealants

O Glazed Package Parts

D Substrate Glazes

O Thick Film Pastes

O Sputtering Targets

O Preform Materials

D Have a technical representative call.

Name _ _ _ _ _ _ _ _ _ _ _ _Title _ _ _ _ __ Company _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _~

Address-------------------

INFORMATION RETRIEVAL NUMBER 50

ELECTRON IC D ES IGN 11 , M ay 24, 19 70

''BELLOWFORM'' PRINTED CIRCUIT
CONNECTORS
.025" Squar~ Terminations for Solderless Wrap
.100" and .125" Contactto-Contact Spacing

CUTAWAY SHOWS INTERNAL
CONFIGURATION ,

D 40, 50, 60, 80 or 100 contacts
D Polarizing slots in
molding- no loss of contact position
D For 1I16"·printed
circuit boards

80 CONTACTS ACTUAL SIZE

40 CONTACTS ACTUAL SIZE

Write for printed circuit catalog on our entire line of receptacle type connectors.

For the Sales Representative Nearest You, See Our Listings inEEM and VSMF Directories.

CONTINENTAL CONNECTORS

CONTINENTAL CONNECTOR CORPORATION 0 WOODSIDE, N. Y. 11377 0 TELEPHONE: (212) 899-4422

INFORMATION RETRIEVAL NUMBER 51

INFORMATI ON RETRIEVAL NUMBER 52 ....

This is our Molex 1175. A lighted push button switch. Snap mounts. Spade or wire terminals make assembly easy. In quantity, costs about sixty cents.
You could pay more, but that's the point. Men who use switches have told us, "enough is enough". We take that seriOusly. By creating switches that do the Job right, yet aren't over-engineered to the point that costs wind up in left field.
ltlis switch is available in nine colors, tions, and is built to go on and off and on. For about sixty cents.

Call RCA for tunnel diodes. They're stable, they're available off the shelf.

RCA tunnel diodes offer prime advantages of immediate availability plus remarkable stability proved by over a million device-hours of testing .
Note these outstanding characteristics : low capacitance, high 10/lv ratios, mechanical ruggedness, improved thermal resistance, uniform ity - all achieved through an RCA process of epitaxially-grown junctions. Check the chart for key parameters.
Added features: the gold-plated leads require no pretinning for soldering efficiency. And the package lends itself well for high-volume PC-board mounting operations . Use RCA tunnel diodes especially in your high-speed switching and high-frequency signal-processing applications .
See your local RCA Representative .for more information. Or call your RCA Distributor-he's fully stocked . Special selections are yours if you need them. For ·technical data on specific types, write : RCA Electronic Components, Commercial Engineering, Sec. 52E -2. Harrison, New Jersey 07029. In Europe : RCA International Marketing S.A. , 2-4 rue du Lievre, 1227 Geneva, Switzerland .

Type
40561 40562 40563 40564 40565 40566 40567 40568 40569 40570 40571 40572 40573 40574

10 (mA)

Min .

Max.

4 .5 9 18 45 90 4.75 9.5 19 47 .5 95 4.75 9.5 19 47 .5

5.5 11 22 55 110 5.25 10.5 21 52 .5 105 5.25 10.5 21 52 .5

1.11. Min .
6/1 6/ 1 6/ 1 6/ 1 6/ 1 8/ 1 8/ 1 8/ 1 8/ 1 8/ 1 8/ 1 8/1 8/ 1 8/1

C (pF) Max.
25 25 30 40 40 15 15 20 25 25
8 8 10 12

tr (ps) Typ.
1800 900 600 350 150
1200 600 400 200 100 600 300 200 100

INFORMATION RETRIEVAL NUMBER 53

ELECTRONIC D ESIGN 11 , May 24, 1970

Publisher
Hugh R. Roome
Editors
New York Office 850 Third Ave. New York, N.Y., 10022 (212) 751 -5530
Editor: Frank Egan Managing Editor: Ralph Dobriner Managing Editor: Raymond D. Speer Microelectronics, Steven A. Erenburg Computers, Milton J. Lowenste in Circuits, Don Mennie 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 Directory Manager, Greg Guercio Copy, Marion Allen
Field Offices
Massachusetts Jim McDermott P.O. Box 272 Easthampton, Mass. 01027 (413) 527-3632 San Francisco Elizabeth de Atley 2051 Wellesley St. (Suite D) Palo Alto, Calif. 94306 (415) 321 -7348 Los Angeles David Kaye 2930 Imperial Highway Inglewood , Calif. 90303 (213) 757-0183 Washington Don Byrne 1425 N St. NW Washington , D.C. 20005 (20 2) 667 -6568
Editorial Production
Dollie S. Viebig Richard D. Grissom
Art
Art Director, Clifford M. Gardiner Assistant, William Kelly Rita Jendrzejewski Lynn Thompson JoJo Miskimmon
Production
Manager, Thomas V. Sedita Helen De Polo Kathleen Mcconkey Lesl ie Stein
Circulation
Manager, Nancy L. Merritt
Information Retrieval
Genate Piccinetti
ELECTRON IC D ESIGN 11 , May 24, 1970

EDITORIAL
.Lesson from Apollo: plan for contingencies
When it all works well, everyon!'! is doing a great j ob. When things go wrong, we find out how competent people reall y are. Competent designers always design margin into their syst ems and plan for contingencies. Lesser designers merely t ry t o meet the specs, with little or no margin, and hope t hat nothing goes wr ong.
The true value of contingency planning really showed up during t he difficult moments fo llowing t h e explosion on Apollo 13.
It was about two years ago, at the North American Rockwell Corp., that the solution was worked out for t he problem of what t o do if two of the fuel cells failed aboard t he service modul e of t h e lunar spacecraft. A remarkable calm prevailed at the Manned Spacecraft Center in Houston, and also on board Apollo 13, when the explosion occurred. These men knew that the situation, while extremely dangerous, had a workable solution that ha d been pr acticed for many hours whi le t he astronauts were training for the mission. It was but one of many contingencies for which the astronauts had drilled. And Astronaut Jack Swigert h ad recently completed the writing of a manual concerned with what t o do if any malfunctions occurred in t h e comman d module.
What better example of the value of designing in margin than that of Grumman's outstanding lunar modu le? A veh icle designed to fly merely from an orbit around the moon to t he lunar surface and back again actually guided the command and service modules around the moon an d all t he way back to earth. This vehicle far exceeded the expected demands upon its navigation and life-support systems, its power ii!Upplies and its engi nes.
Yet it wasn't always so in the beginning of the Apollo program. Witness the disastrous fire th at cost t h e li ves of t hree astrona uts and the weight problems t hat the early lunar modul e h a d at Grumman. Each of t hese shortcomings co£t t he nation heavily. But the fina l design was excellent.
A lesson must be learned from the extremely compet ent design engineers who put together th e Apollo system. Never fa il t o plan for major contingencies. Always ails ume th at Mu r phy (wh oever he was) was right when he postulated his law: " If it can fa il , it will."
DAVID N. K AYE
77

Liberate your FET amplifier design from tight
device specifications by using this combination bias technique. Transfer curves greatly simplify the job.

Engineers often design FET amplifiers that are unnecessarily sensitive to device characteristics because they may not be familiar with proper biasing methods.
One way to obtain consistent circuit performance in spite of wide device variations is to use a combination of constant-voltage and self biasing. The combined circuit configuration turns out out to be the same as that generally used with bipolar transistors, but its operation and design are quite different.
Three basic circu its
Let's examine three basic common-source circuits that can be used to establish a FET's operating point (Q-point) and then see how two of them can be combined to provide greatly improved performance. The three basic biasing schemes are:
· Constant-voltage bias, which is most useful for rf and video amplifiers employing small de drain resistors.
· Constant-current bias, which is best suited to low-drift de amplifier applications such as source followers and source-coupled differential pairs.
· Self bias (also called source bias or automatic bias), which is a somewhat universal scheme, particularly valuable for ac amplifiers.
The Q-point established by the intersection of the load line and the Vos = - 0.4 V output characteristic of Fig. 1 provides a convenient starting point for the circuit comparison. The load line shows that a drain supply voltage, VoD, of 30 V and a drain resistance, R o, of 39 kn are being used.
The quiesent drain-to-source voltage, Vn sQ· is 15 V, allowing large signal excursions at the drain. Maximum input signal variations of ± 0.2 V will produce output voltage swings of ±7.0 V -a voltage gain of 35.
The constant-voltage bias circuit (Fig. 2) is analyzed by superimposing a line for Vos = con-
James S. Sherwin, Applications Manager, Siliconix, Inc., Santa Clara, Calif.
78

stant on the transfer characteristic of the FET. The transfer characteristic is a plot of In vs
Vos for constant VDs· Since the curve doesn't change much with changes in Vos, it is quite useful in establishing operating bias points. In fact, it is probably more useful than the output characteristics because its curvature clearly warns of the distortion to be expected with large input signals. Furthermore, when a bias load line is superimposed, allowable signal excursions become evident and input voltage, gate-source signal voltage, and output signal current calculations may be made graphically.
The heavy vertical line at Vos= - 0.4 V establishes the Q-point of Fig. 1. No voltage is dropped across resistor R0 because the gate current is essentially zero. Ro serves mainly to isolate the input signal from the Voo supply.
Excursions of the input signal, el(, combine in series with Vos so that they add algebraically to the fixed value of - 0.4 V. The effect of signal variation is to instantaneously shift the bias line horizontally without changing its slope. The shifting bias line then develops the output signal current as shown in color in Fig. 2.
The constant-current bias approach (Fig. 3) for establishing the Q-point of Fig. 1 requires a 0.39-mA current source. For an ideal constantcurrent generator, input signal excursions merely shift the bias line horizontally and produce no resultant gate-source voltage excursion. This bias technique is therefore limited to source followers, source-coupled differential amplifiers, and to ac amplifiers where the source terminal is bypassed to ground at the signal frequency.
If an ac ground is provided by a bypass capacitor across the current source, a vertical ac bias line will be established. Input signal variations will then translate the ac bias line horizontally, and signal development will proceed as with constant-voltage biasing (Fig. 3, color).
Should the bypass capacitor not provide a sufficiently small reactance at the signal frequency, the ac bias line will not be vertical.· It will still intersect the transfer curve at the Q-point but with a slope equal to - (1 / X .. ) = - wC (Fig. 4). This will lower the gain of the amplifier because of signal degeneration at the source. The input
ELECTRONIC D ESIGN 11 , May 24, 197 0

signal, eg, is reduced by the drop across the

capacitor:

= = Vgs eg - v. eg ::__ i sX c

(1)

It is clear from Fig. 4 that the input signal

only shifts the operating point by an amount

equal to vs., the effective input signal. As the

signal frequency is decreased, the slope of the

ac bias line decreases, causing the effective input

2ignal to approach zero.

Self bias needs no extra supply

The self-bias circuit (Fig. 5) establishes the

Q-point by applying the voltage dropped across

the source resistor, R5, to the gate. Since no voltage is dropped across Rs when I o = 0, the

self-bias load line passes through the origin. Its

slope is given by - 1/ R . Therefore, the

desired Q-point is es tab 1is he d by setting

-1/ Rs = Ioq/ VosQ·

Signal development is the same as in the case

of the partially bypassed constant-current

scheme except that the load line is a de bias line.

Signal degeneration is described by Eq. 1 with

Xe replaced by Rs. The ac gain of the circuit can

be increased by shunting Rs with a bypass

capacitor, as in the constant-current case. The

ac load line then passes through the Q-point with
a slope - (l/ Zs = - (wC + l / Rs).

The circiut is biased automatically at the de-

sired Q-point, requires no extra power supply

and provides a degree of current stabilization

not possible with constant-voltage biasing.

A fourth biasing method, combining the ad-

vantages of constant-current biasing and self

biasing, is obtained by combining the constantvoltage circuit with the self-bias circuit (Fig. 6). A principal advantage of this configuration is that an approximation may be made to constantcurrent bias without any additional power supply. The bias load line may be drawn through the selected Q-point and given any desired slope by properly choosing Yoo· (The bias line intercepts the Vas axis at Voo ). The larger V00 is made, the larger Rs will be and the better will be the approximation to constant-current biasing.
All three circuits in Fig. 6 are equivalent. Circuit 6a requires an extra power supply. The need for an additional supply is avoided in 6b by deriving Voo from the drain supply. R1 and R2 are simply a voltage divider. To maintain the high input impedance of the FET, R1 and R2 must both be very large.
Very large resistors cannot always be found in the exact ratio needed to derive the desired Voo in every circuit application. Circuit 6c overcomes this problem by placing a large R0 between the center point of the divider and the gate. This allows Ri and R2 to be small, without lowering the input impedance.
One point of caution worth remembering is that as Voo is increased, Vs increases, and Vos decreases. Therefore with low Voo, there may be a significant decrease in the allowable output voltage swing.
Biasing for device variations
The value of the combination-bias technique becomes apparent when one considers the normal

;..LI

-12

1. A large dynamic range is provided by the operating
point at VosQ= 15 V, 10 Q= 0.39 mA and VasQ = -0.4 V.
The output characteristics are for a typical 2N4339.
E LECTRONI C D ESIGN 11 , M ay 24, 1970

2. Constant-voltage bias is maintained by the V00 sup· ply as shown on this typical 2N4339 transfer curve . Input signal eg moves the load line horizontally (color).
79

+Voo

Vos·ISV

OUTPUT

..0.8 1-1 i ~

0.4

Vos·l~V 1.2

ac LOAD LINE
SL.DPE--WC--

0.8 .t4
~
0.4

VQSIV)

3. Constant-current bias fixes the output voltage for any R0 . Hence, input signals cannot affect the output unless the current source is bypassed (color).
production spread of device characteristics. The problem is illustrated in Fig. 7 where two limiting sets of output characteristics, representing the actual min-max spread of the Siliconix 2N4339, are presented. Limiting characteristics like these are not normally available. Even if they were, however, they'd be of little help in establishing operating points suitable for all devices with output characteristics lying between the two extremes. The problem is much more easily approached by using the set of limiting transfer characteristics of Fig. 8.
Attempting to establish suitable constantvoltage bias conditions for a production spread of devices is practical only for circuits with very small values of de drain resistance-for example, circuits with inductive loads. As the constantvoltage bias plot of Fig. 8 reveals, constant gate bias causes a significant difference in operating I oQ for the extreme limit devices. At Vos = - 0.4 V, the range of IDQ is 0.13 to 0.69 mA, and VosQ for a given R 0 will vary greatly for most resistance-loaded circuits. For the example of
= = Fig. 1, with R o 39 kn and V oo 30 V, VDsQ
varies from near saturation (5 V) to 25 V. An apparently excellent method of biasing is
the constant-current method of Fig. 3. Biasing in this manner fixes the operating drain current for all devices and sets VDsQ to VDD - IDQRL for any device in the production spread. Vos automatically finds a value to set the appropriate I oQ = constant for all devices. For the constant-
80

4. Partial bypassing of the current source (Fig. 3) lowers the circuit gain by tilting the ac load line from the vertical. The capacitor drop subtracts from eg.
= current bias plot of Fig. 8, with IDQ 0.39 mA,
Vos would range from - 0.11 V to - 0.67 V. Output characteristics are not needed as long
as IoQ is chosen to be below the minimum l oss·
With Ro = 39 kn and VoD = 30 V, VnsQ is 14.8
V for all devices. The disadvantages of the constant-current
method are that it allows no signal to be developed unless the current source is bypassed and, as we shall see, it lacks the flexibility to provide constant gain despite variations in the forward transconductance, g r., of the devices.
The self-bias scheme is a reasonable choice for single-ended de amplifiers and for ac amplifiers. In unbypassed or de circuits, some compromise must be made between the gain loss due to current feedback degeneration and the advantage of current stabilization achieved with high R s.
An appropriate choice of IuQ limits can be made by using the pair of limiting transfer curves. For example, for Rs = 1 kn, the load line shown on the self-bias curve of Fig. 8 is established. The maximum I o is 0.52 mA, and the minimum I 0 is 0.24 mA. The operating range of VDsQ may be calculated for any value of V00 and Ru. Clearly, for R u = 39 kr!, the maximumlimit device (device B) would operate with VosQ = 9.8 V and the minimum-limit device (device A) would operate with VusQ = 20.6 V. This results in fairly satisfactory operation for all devices. However, such a variation in IDQ imposes severe limitations on the circuit design.
ELECTRONIC DESIGN 11 , M ay 24, 1970

l.Z

-1.6

-1.2

5. The self-bias load line passes through the origin with a slope -1 /R s. Bypassing Rs will steepen the slope (color) and increase the gain of the circuit.
A better aprpoach is illustrated by the combination-bias curve of Fig. 8 with Voo = 1.2 V. The range of I oq for this bias condition is 0.25 mA to 0.32 mA. A similar minimum difference
in l oq could be achieved with Rs = 6 kfl and = V0 0 0, (a self-bias condition) but the operat-
ing points would be pushed toward the toe of the transfer characteristics and allowable signal input would be reduced.

= The upper load line allows v~, ± 1.8 V (limit-
ed by I Dss,d, while the lower line allows a v'"'s of only ±0.7 V (limited by VPA). (The subscript letters A and B refer to the minimum and maximum devices, respectively.) The combination circuit allows almost ideal operation over the full production spread of devices. Even with R 0 62 kn, the VosQ would range only between 10 and 15 V.
For this circuit, RD should be chosen to allow the largest output signal swing for l 0 q midway between the two extremes of 0.25 and 0.32 mA; namely 0.285 mA. Setting the voltage drop across R o at one-half of (Voo - 2V r typ) or 14 V, yields R0 = (14 V/ 0.285 mA) = 49 kfl.
It is helpful, in any design, to know the effect of temperature variations on the transfer curves and transconductance characteristics. Ideally, minimum and maximum transfer characteristics would be plotted at three temperatures: above, below, and at room temperature. Then the design would take all types of variation into account.
Minimize the gain variations
Leaving Rs unbypassed helps reduce gain variations from device to device by providing degenerative current feedback. However, this method for minimizing gain variations is only effective when a substantial amount of gain is sacrificed.
A better approach is to use the combinationbias technique with the bias point selected from the transfer and transconductance curves (Fig. 9) .
As Fig. 9 shows, it is possible to find an Rs and a Voo that will set I DQA and I oQB to values

Yos·l!lY

LZ
...
D
!

.
Ra
+'191
0

+Yoo Ro

+Vim "o

'='
0

Rs
0

-L6

-1.Z

-o.e

-0.4

VGS(V)

+o.4

+o.e

+LZ

+1.6

6. All three combination-bias circuits are equivalent. They add constant-voltage biasing to the self-bias circuit
ELECTRO IC D ESIGN 11 , M ay 24, 19 70

to establish a reasonably flat load line without sacrificing dynamic range.
81

1.2

-0.2

- 0.8
!
~ 0.4
0 0

-0 .4 - 0 .6

-0.8
-1.0 -1 .2

v05 1vl

7. The wide variations in device performance shown by this pair of output characteristics make clear the disadvantages of constant-voltage biasing.

so that g rsQ will be the same for both devices. The g rsQ of all intermediate devices will be approximately equal to the limiting values. Thus, a constant, or nearly constant, stage gain is obtained even with a bypass capacitor.
The design procedure is as follows: Step 1. Select a desired lnQA below InssA· A good value, allowing for temperature variations,
is 60 % of I nssA· This will allow for decreasing
Inss due to temperature variation and for reasonable signal excursions in load current.
Step 2. Enter the transfer curves at InQA :::::

0.6 I ossA (0.3 mA) to find VasQA· This VasQA :::::

0.2 V for the 2N4339.

Step 3. Drop vertically at V osQA to the mini-

mum limit transconductance curve to find g ,"QA ·

The value as read from the plot is approximately

1000 µ.mho.

Step 4. Travel across the g r. plot to the maxi-

mum curve to find VosQs at the same value of g r·.

This is VasQB · - 0.7 V.

Step 5. Travel vertically up to the maximum

limit transfer curve to find InQB at VosQB· This is

InQ B ::::: 0.36 mA.

Step 6. Construct an Rs bias line through

points QA and Q0 on the transfer curves. The slope of the line i~ 1/ R s, and the intercept with

the Vas axis is the required Voo-

As Fig. 9 demonstrates, it may be somewhat

inconvenient to perform Step 6 graphically. An

algebraic solution can then be employed instead.

The source resistance is given by

Rs = (VosQA - VasQB) / OnQB - IoQ.,) (2)

and the bias voltage is

Yao = R s InQB + VasQB

(3)

Care should be taken to maintain the proper

algebraic signs in Eqs. 2 and 3. (For n-channel

FETs, Vas is negative and I n is positive. For

p-channel units, the signs are reversed.)

If the transconductance curves of Fig. 9 are

not available, g r. can be determined by simply

measuring the slope of the transfer curve at the

desired operating point. Just place a straight-

edge tangent to the curve at the Q-point and note

the points at which it intercepts the I o and Vas

axes. The slope and g r. are given by:

slope = g fs = I D( intercept) / - Vos1;ntercept) (4)

In designing a constant-gain ·circuit, simply

Vos·l5V 1.5 L2

0.8 H
0
i
0.4 ~
-1.· -t.2 -0.8 -0.4 ValVl r - - - - - - - - - - r - 1.5
1.2

H ~
!
QA

0.8

0.4

-1.6 -1.2 -o.a -0.4

0 0 +o.4 -+0.8

+1.2 +J.6

-1.6 -1.2 -0.8 -0.4 VeslVl

L5 1.2
0.8 t:
!
0.4

8. The advantages of combination biasing, when one is working with a spread of device characteristics, are
82

made obvious by plotting the load lines for the various types of biasing on a pair of limiting transfer curves.
ELECTRONIC DESIGN 11 , M a y 24, 1970

set the straightedge tangent to the transfer curve of device A at point QA and slide it, without changing its slope, until it is tangent to the curve of device B. The tangency point is Qn.
Designing without output curves Although the transfer characteristic has been
seen to be extremely valuable in designing a bias circuit, it cannot be used to graphically establish V osQ· However, if a set of output curves is not available, V osq can be determined or selected from the transfer curve by using the following procedure:
Step 1. Establish Rs and limiting valueil of I0 q, Vasq and grsQfrom the transfer curve.
Step 2. Establish V00 as available, but in no case greater than BVass nor less than several
1.2
o.8 r
i
0.4

times V1.. There are special cases where Vl)n will be below this limit, but in no case should instan-

taneous be V c11< allowed to fall below 2 x VP if

minimum distortion is to be achieved.

Step 3. Set Vosq approximately midway be-

tween Vim and 2 x V r; lower if large output sig-

nals will not be handled.

Step 4. Select Ro to give the appropriate VDsQ·

The formula is:

Ro = [ (Voo - VDsQ) / 0.5 I oQA + loqu] - Rs. (5)

In the example of Fig. 8, this procedure would

have yielded Vosq = (30-3) / 2 = 13.5 V and

Ro= (30 - 13.5) / 0.5 (0.52 + 0.24) mA - 1 k!l
= 42.5 kn.

Step 5. Check to ensure that with this R 0 , de-
vice B is not in a saturated condition-Voqn =
VDD - IDnQ Ro > 2 Vr + Rs IonQ· Decrease

Ro if this condition is not met.

An alternate method, that selects R0 to provide a specified voltage gain, follows Steps 1 and

2 above and then proceeds as follows:

Step 3. Determine required stage gain, A" and

set Ro = A j grsQ·

Step 4. Calculate V osQ to ensure that the

criteria of Step 2 are not violated:

Vnsq =Vim - (Rn+Rs) IDQ·

(6)

Step 5. If necessary, change l oq, Vnn, A v and/

or Ro to obtain an optimum compromise. · ·

Bibliography
Sherwin, J. S., "How, Why and Where to Use FETs," Electronic Design, May 17, 1966, p. 94.
Sherwin, J. S., "Knowing the Cause Helps to Cure Distortion in FET Amplifiers," Electronics, Dec. 12, 1966,
PP. 99-105.

-1.6

-1.2

-0.8 !

ValVl

t -0.4

I I

2000

1600

1200
\
800
400

9. Gain variations are minimized when the load line is designed to intersect the pair of limiting transfer curves (top) at points of equal gr. (bottom).
ELECTRONIC DESIGN 11, M ay 24, 1970

Test your retention
Here m·e questions based on the main points of this article. Their purpose is to help you make sure you have not overlooked any important ideas. You'll find the answers in the article.
1. Why is constant-current biasing unsuitable for common-soitrce de amplifiers and unbypassed ac amplifiers?
2. What is combination biasing?
3. How can combination biasing be used to reduce amplifier gain variations when FETs with different transconductances are used?
4. How can a FET transfer characteristic be used to establish the output operating point when output characteristics are not available?
83

Output enable
1 Inputs
Input enable
Output enable
1 Inputs
Input enable
Output enable
Inputs )
l
Input enable Output enable
Inputs )
l
Input enable

I
DM8551
]
DM8551
I
DM8551
l
DM8551

Data Bus
ELECTRON IC D ES IGN 11 , May 24. 1970

Tri-state Bus-line
There's a third state in a TTL databus with our DM8551. Conventional low impedance logical 1, logical 0 and a high impedance state you can use as a logical "neutral." The 8551 gives you the high impedance characteristics of an open collector output with the high drive of TTL. It makes it possible to design mini-computers as bus-organized systems totally TTL. Direct coupling. Shorter lines. TTL all the way.
DM8551- Bus-OR'd Quad D - operates synchronously from a common clock. This element has the further advantage of input data acceptance without controlling the clock. Specifically designed for use in bit serial and bit parallel applications. Controlling the third state makes it possible to connect the output of the 8551 directly to the output of other 855ls. You can impede the output of all devices except the one you select, logically.
Take it from National. The 8551 is a new concept in TTL and something else in a databus. TTL/ MSI , logically from National Semiconductor. Write for App Notes and specs. 2900 Semiconductor Drive, Santa Clara, California 95051. (408) 732-5000. Telex: 346-353 Cables: NATSEMICON.
National/TTL MSI

INFORMATION RETRIEVAL NUMBER 54

ELECTRONIC 0 ES IG 11 , May 24. 1970

Design filters in minutes.
Characterize performance by nondimensional ratios
and calculate their values on a computer.

Filter design can be reduced to a simple routine by using a computer program to derive basic relationships, such as capacitance or resistence ratios. A plot of these results is then used to determine filter parameters. The entire process of filter synthesis can be completed in a matter of minutes.
As an example of this approach, two types of filters - an active low-pass and a passive bridgedT - are designed. Coefficients of the filter transfer functions are related to performance specifications, and suitable programs are written for them.

are dimensionless, a single plot provides a general solution to a set of specifications.
A BASIC program to compute values for Eq. 1 is given in Fig. lb. Capacitance ratios to 100 and damping ratios from 0.1 to 1.0 offer realizable results for Butterworth, Chebyshev and other lowpass filters.
Minimum capacitance ratio exists for R:i/ R1 = 0.5 and Ri = R2. The results are plotted in Fig. 2. Only this graph is required for the desired synthesis. For example, a Butterworth 2-pole, low-pass

Use dimensionless ratios
The key to the method is to define a set of dimensionless ratios that makes it possible to design the filters without regard to passband gain, corner frequency, damping ratio or impedance levels. Thus all filters can be designed from one set of curves.
For the feedback amplifier of Fig. la, for example,
Eo/ E1 = (Ra/ R, )/ (RaR1C1C2s2
+ (2 / R1 + l / Ra) R 1RaC2s + 1).
This equation is of the form

where:

W o = 1/ ""RaR 1C1C2

or C2 = l / (R1wo °" (R3/ R 1) (C1 / C2))

s and = °" (R, / R3) (CdC1) (1 + 2Ra/ R1) / 2

or C1 / C, = + (1 2Ra/R1 ) 2/ 4 (R a/ R 1) t 2.

(1)

The network thus provides adjustable passband
gain, R i/ Ri. damping factor, '' and corner frequency, W o.
Equation 1 is the relationship to be plotted. Instead of four independent variables, only two need be considered and, since all variables of Eq. 1

Benton Bejach, Electronic Development Manager, BorgWarner Controls, Santa Ana, Calif.
86

LOPASS
10 PRINT "R="· "Z="· "C=" 20 FOR N=l TO STEP 1 30 LET R = .Ob25*(2tN> ~O FOR Z=.l TO 1.1 STEP .2 50 LE , C =<<2*R+l>t2)/(~*R*<Zt2)) bO PRINT R,Z,C 70 NEXT Z 80 NEXT N 90 END
RUN
1. The active low-pass filter is based on a feedback amplifier (a). In the analysis given, R2 = R1 . A BASIC program computes values for the filter repsonse (b).
ELECTRONIC D ESIGN 11 , M ay 24, 1970

filter is required with a passband gain, Rd Ri. of 32 and a corner frequency of 1 kHz. R1 is chosen to be 10 kn and t = 0.707. Referring to Fig. 2:
C1/ C2 = 66 and C2 = 1/(104 X 27!" X 103 ..,/32 x 66).
Thus C2 = 347 pF, C1 = 66 X 347 = 22900pF,
and R2 = 32 x 104 = 320 kn.
When components with 5% tolerance are used, about 1-dB deviation from the predicted frequency response is observed.
Bridged-T filter is another test Another analysis treats the passive bridged-T
filter (Fig. 3). Its transfer function is of the form:
Eo/ E1 = [(s/ wo) 2 + 2t,s/ wo + 1] / [(s/ wo) 2 + 2t2s/ wo + 1].
Ifs = jw0, the notch depth is E0/ E 1= ti/t2and the
following dimensionless relationships exist:

Cd C1= (4ti (- 1 + t d ti ) 2)/ 4ti (- 1 + t d ti) - 1,

Wo = l /..J R1C1R2C2.

(2)

These relationships approach infinity for pairs of
ti and t2/ t1 obeying the relation:

Some values of this set that establish the boun-

daries of physically realizable networks are as

follows:

t2/ t1

0.10

26.0

0.15

12.1

0.20

7.25

0.25

5.0

0.30

3.78

0.35

3.05

0.40

2.56

0.50

2.0

The BASIC programs given in Fig. 3b plot the

R1 / R2and C2/ C1 ratios. Dummy variables are used

as follows: R for the resistance ratio, C for the

1000
I
· 7
!i 4 3
2

2
·1°9 7 6 !i 4 3
2

0 .2

0 .8

1.0

1.2

I ~ R2

R·¥I ·

TC2

CAPACITANCE RATIO PROGRAM.

s FOR D = S TO SO STEP S

10 PRINT "D ="i D

lS 20

= FOR ~ = .1 TO .S STEP .OS
LET C <~·~t2*<Dt2-2*D+l))/

( ~·~t2· <D-1 )-1)

PRINT "~ ="i ~ , "C="i C

NEXT ~

NEXT D

END

RESISTANC~ RATIO PROGRAM ·

S FOR D = S TO SO STEP S

10 PRINT "D="; D

lS 20

= FOR Z = .1 TO .5 STEP .OS
LET R l/(~*<.Zt2*<D-l>>-l>

25 PRINT ".Z ="; .Z , "R="; R

NEXT .Z

NEXT D

END

2. A nondimensional plot of low-pass filter response uses C, /C" and the damping factor as variables and R3 /R 1 as a parameter.
ELECTRON IC D ES IGN I I , M ay 24, 197 0

3. The response of the passive bridged-T filter (a) is computed by the BASIC program in (b) . Both capaci· tance ratio and resistance ratio programs are shown.
87

10009 8 7 6 5 4 3 2
2

4 3
2 R1
Rz
I
9 8 7 6 5 4
3
2

0 .1.

7 6 5
4

..... t2/t, ~~~~~~~~~
4. The ratio, C2 /C 1 , of the bridged-T can be read from this set of curves for any desired notch ratio and frequency.

0.01 0

tz I t1

5. The bridged-T resistance ratio, R1 /R 2 , is determined from this family of curves. Both this set and that of
Fig. 4 are plotted from the program values of Fig. 3 (b) .

capacitance ratio, D for the notch ratio and Z for t2/ l1- The results are plotted in Figs. 4 and 5.
For example, the open-loop transfer function of a proposed closed-loop system has complex roots at f0 = 10 Hz and t = 0.15. The bridged-T filter is selected so that its complex zeros cancel the plant poles. Figures 4 and 5 indicate that pole cancellation can be achieved over a notch ratio range of at least 15 to 50. Thus the undesired complex poles are exchanged for a pair of easily calculated realaxis poles. Considerations of the closed-loop problem at hand will dictate the optimum notch depth.
Assume that t2/ t1 = 30 is desired and that R2 = 100 k.
From Figs. 4 and 5 : R i/R 2 = 0.62 and C2/ C1 = 45.5.
From Eq. 2:

1
C i = - -- - --
~-~~~
WoR2..J (R1 / R 2) (Cd C1)

Thus

= 0.03µf ,

271" x 10 x 106 ..J0.62 x 45.5

C2 = 45.5 x 0.03 = 1.37 µf,
and R1 = 0.62 X 105 = 62 kQ, completing the synthesis. Again experimental results closely approach the theoretical. · ·
Test your retention
H ere are questions based on the main points of this article. Their purpose is to help you make sure you have not overlooked any important ideas. You'll find the answers in the article.
1. What are the advantages of using nondimensional ratios in filter design?
2. What causes most discrepancies between computed and actual performance?
3. What is the basic configuration of an active filter?
ELECTRON IC D ESIGN 11 , May 24, 1970

HERES HO THE VO-M SPECIALISTS GO DIGITAL

The principal problem with digital V-0-M's is that circuitry (rather than readability) limits their accuracy. Triplett has attacked that problem with characteristic thoroughness. The result .. . a totally new circuit (patent pending) in which there is virtually no internally-generated current from the V-0-M input circuit to affect measuring accuracy.
Triplett's Model 8000 digital V-0-M .. . the only V-0-M with this newly-developed circuit ... offers a true DC accuracy of 0.1% of the reading + 1 digit and an AC accuracy of 0.2 % -+- 1 digit. Triplett calls this "true accuracy " because it's the same accuracy you can achieve day-in and day-out, test-after-test, on any kind of circuit.
Quality-minded buyers will appreciate, too, the other job-matching features of Triplett's new digital V-0-M. Like . . . automatic zeroing; AC and DC voltage measurements from 0.1 mV to 1000 Vin 5 ranges at 10 megohms input resistance; AC and DC currents from 0.01 uA to 1000 mA in 6 ranges; 0.1 ohm to 10 megohms in 6 ranges.
Sounds like it was worth waiting for, doesn 't it? Available through your local Triplett distributor, the new Model 8000 is priced at only $575 suggested USA user net.
If you 'd like the added convenience of an instant replay circuit that displays a previously-
stored reading for on-demand comparison with an existing reading, ask for the Triplett Model 8000-A at $630 suggested USA user net. For more information, or for a free, no-obligation demonstration, call your local Triplett distributor or sales representative. Triplett Corporation, Bluffton, Ohio 45817.

1 l fTRIPLETT
The World's mo st complete line ol V-0-M's . . . choose the one that 's just right lor you

1. True 0 . 1 % DC a ccuracy . Virt ually no ki ckba ck curre nt*. Allows voltage measuremen ts in high resistance circu its at stated accuracy.
2. High AC accuracy with nearly perfect AC lin e ar ity and 10 megohm input resistance . .3. Low profile desi gn in sh ielded ca se with mo dular constructio n for ease in use and ma intenance . *There is vi rtually no internally gen e rated current from the V-0 -M input ci rcu it to affect mea suring accuracy . (Potent pending on this feature).

fUN ( TION

RANGE

·/ 100

I
0 H

.1K

M s

PO WER OFF . . ON

TYPE I

INFORMATION RETRIEVAL NUMBER 55

ELECTRON IC D ESIGN 11 , May 24 , 1970

Gate your op amp-and get a powerful
new device that simplifies test, control, switching and modulation circuitry.

Adding a gate to an operational amplifier produces a new device that acts as both a switch and an amplifier. It isolates inputs and outputs when a gating signal is applied, and it functions as a conventional op amp when the signal is not present.
The gated op amp can be used to provide variable gain, switch ac and de signals, perform sample and hold operations and act as a wideband, phase-sensitive demodulator. And it usually does so with fewer components than conventional circuits require.
The supply voltage, ground or any other convenient source may be used to provide the gating signals. Depending upon the output stage configuration, converting an existing op amp for gated operation may be as simple as adding a single lead. But for most currently available IC op amps several external components will be required.
How to add the gate
A typical example of how to add gating control is shown in Fig. 1 for an amplifier with a Class A output stage using two npn transistors. In this case the addition of two diodes provides the required output isolation.
Assuming a high impedance drive from the preceding portion of the circuit, diode Di cuts off the constant current source, Q,, when the gating terminal is connected to the negative supply, and diode D2 protects the reverse base emitter junction of Q2.
A similar example, involving only the addition of a lead for the gating signal is accomplished with the Ferranti ZLD2T op amp (Fig. 2).
In this case, with the gating input unconnected the amplifier performs as a normal ZLD2T, allowing the usual op-amp functions. When the gating input is connected to the negative supply line, both Q3 and Q6 are cut off. With no current supplied to Q1 and Q;, Q, does not conduct. The inverting and noninverting inputs are thus isolated from each other, and from the output.
John M. Morrison, Senior Research Engineer, Ferranti Limited, Edinburgh, Scotland

DRIVE 01

GATING INPUT
1. Two diodes add gating capability to this Class A out· put op amp. Similar techniques can be applied for op amps with Class B and emitter-follower output stages.

u - - - - - - - - ' NON-
INVERTING 3 INPUT

~OUTPUT

INPUT ' - -- i ---0 8 GATING

'-------<>4
2. One lead is all that is required to convert the ZLDT operational amplifier for gated operation. External com· ponents are required to convert most other existing IC op amps.

ELECTRONIC DESIGN I I , May 24, I970

Build a pulse train encoder and visual fault indicators.

A simple pulse coding circuit is one application for gated op amps. As shown in Fig. 3, a gated op amp and four resistors will combine three pulse trains into a single signal. The eight possible input combinations produce eight distinct output voltage levels. This circuit is particularly useful in test data recording where the number of inputs exceeds the number of recording channels.
A useful display that provides visual fault indication is a second application for the gated op amp in test instrumentation. In a system where a single input generates multiple ac or de outputs, all of varying amplitudes or polarities, a simple histogram plot on an oscilloscope screen (Fig. 4) is a time-Saving check. For example, if we have a range of de voltages to be monitored, which bear a specified relationship to each other, these voltages are normalized to some convenient value by a choice of suitable resistor ratios, and sequential selection is obtained by a ring counter synchronized with the time base sweep of the oscilloscope. Instant indication of any deviation is displayed.

o~ R3
Vo

GATING

INPUT

-v

3. A handy coding circuit produces eight dis· tinct and unambiguous output voltage levels for three pulse train inputs. A much more complex circuit would be required if a gated op amp was not used.

TO OSCILLOSCOPE Y DEFLECTION AMP.
RI

4. A ring counter controls the switching of the gated op amps in this histogram display. The oscilloscope alerts an operator to any -vo malfunction . Any deviation from the refer· ence voltage (VA) is indicated as a change in voltage level on the scope.

G1 . f l _ _
GATING G2 . J l _ _ INPUTS G __fl_
3 : _ ; G4_Jl_

Get variable gain elements or three-state comparators.

Another application is the three-state comparator circuit of Fig. 5. An op amp in an openloop configuration has two stable states. By adding two transistors to a gated op amp, a third state, with the output level zero, is present when the input voltage allows the extra transistors to conduct, thus cutting off the amplifier. This circuit is useful for limit monitoring.
A variation ·can be obtained by adding a third transistor (Fig. 6). Applications include a servo gain-change element, a portion of an afc feedback loop, frequency doubler and a special-purpose comparator.

v1 RI
QI

lleE

I I

FOR QI

5. Get a th.ree-state comparator by using two transistors with a gated op amp. The circuit is useful for automatic testing and sorting.

6. Gain varies with input level when a third transistor is added to the circuit of Fig. 5. The circuit is particularly useful in nonlinear control systems.

EL ECTRONIC D ESIGN 11 , M ay 24, 1970

Sample and hold with a FET and a capacitor.

With a capacitor and FET connected across the output (Fig. 7) , the gated op amp acts as a sample and hold circuit. When the amplifier conducts, the capacitor is charged to a value set by the external gain-control resistors.
The FET allows the charge on the capacitor to be held for a period that is a function of the FET gate leakage and the cutoff leakage of the op-amp output stage transistors. Since the FET is inside the feedback loop, its gate source voltage is largely irrelevant.

GATING

INPUT

lo_sAMPLE

-v

7. Make a sample and hold circuit using a FET and a capacitor with a gated op amp. A feedback capacitor will convert this circuit to an integrating sample and hold circuit.

Perform multiplication and division of two variables.

Multiplication of two variables can also be accomplished with a gated op amp. When a de voltage is applied to the noninverting input, and a variable mark-space ratio square wave is used as the reference gating signal (Fig. 8), the mean output level is proportional to the product of the input voltage and the conduction period. (Many methods exist for generating a pulse period proportional to a de voltage.) Division can be accomplished in a similar way.

8. A voltage multiplier circuit consists of a gated op amp and a pulse generator. Pulse repetition rate is constant while pulse width
is proportional to v2.

Use gated op amps to switch both ac and de.

The gated op amp can also be used in many switching applications. With unity gain and an inherently low output impedance due to the
100 % series voltage feedback (Fig. 9), the con-
ducting gated op amp develops its input voltage,
V11 across the load. When it is cut off, there is a potential divider action that allows a defined fraction of V2 to appear across the load, with isolation from the amplifier input. Both ac and de signals can be switched.

Vi 0 - - - - - - - - - J V I R " ' - I- - - -

GATING INPUT

....

9 . Switch both ac and de signals with the same gated op amp. When the op amp is conducting, output voltage is V1 .

ELECTRONIC DESIGN 11 , M ay 24, 1970

Modulators are possible, too.
Modulation is also an interesting field of application for the gated op amp. With a de voltage applied to the input of the noninverting amplifier and a square-wave gating signal (Fig. 10), an output is generated that is synchronous with the gating reference.
With a sinusoidal input and square-wave reference gating signal, a half-wave, phase-sensitive demodulation is produced. This circuit has a number of advantages over conventional demodulators. They include:
· High input impedance. · A wide range of allowable load impedance. · Wide range gain. · No need for special reference transformers. Full-wave demodulation is made possible by using an inverting amplifier configuration and an input in phase with the switching reference (Fig. 11). In this case one input half cycle is inverted when the amplifier conducts, and the other half cycle is reproduced across the load by the potential divider action of R1 and Rz when the amplifier is cut off. Unlike the half-wave demodulator, the output amplitude is load-dependent during one-half cycle. ··

de R2

RI
GATING INPUT
I0 0 0 SQUARE ·WE REFERENCE

SQUARE WAVf. SYNC
TO REFERENCE
loon

10. Modulate an input voltage signal using a square· wave reference to gate the op amp. Normal op-amp characteristics provide ga in for low-level signals .
R2

R3 GATING INPUT

IV\N
OEMOOULATED SINE WAVE

l o o SQUARE WAVf. REFERENCE

11. Full-wave demodulation without special transformers is accomplished in this gated op-amp circuit. The same circuit can be used for a wide frequency range of signals.

E LECTRO IC D ESIGN 11 , M ay 24 , 1970

STATE OF THE ART SEMINARS
FOR ENGINEERS

AND SCIENTISTS

Here's an opportunity to engage in short programs that will review many of the latest advances and engineering techniques in your field · . · presented
by RCA Institutes.

LOGIC DESIGN

Minneapolis Washington, D. C. Chicago Albuquerque Montreal Detroit

5/18-22 6/1-5 6/15-19 7 /27-31 8/24-28 8/31-9/ 4

DIGITAL SYSTEMS ENGINEERING

Cleveland Boston
Montreal Denver New York Washington, D. C. San Francisco San Diego Huntsville, Ala. Chicago Houston

5/11-15 5/18-22
6/1-5 6/22-26 7/6-10 7 /13-17 7/20-24 7 /27-31 8/3-7 8/10-14 8/24-28

DIGITAL COMMUNICATIONS

Albuquerque Houston San Francisco Boston Los Angeles Huntsville, Ala. Minneapolis Syracuse, N. Y. Washington, D. C. New York

5/18-22 6/1-5 6/15-19 6/22-26 6/22-26 7/6-10 7/13-17 7 /27-31 8/10-14 8/24-28

INTEGRATED CIRCUITS

San Francisco San Diego Detroit Rochester Montreal Houston Pittsburgh Clark, N. J . San Francisco Los Angeles

5/20-22 5/25-27 6/8-10 6/29-7 /1 7/6-8 7 /13-15 7/27-29 8/3-5 8/10-14 8/17-19

Above schedule subject to change
R B n ~---------------------~

RCA Institutes, Inc. Dept. ELD -50 Institute for Professional Deve1opment Central & Terminal Avenues. Clark. N. J. 07066
For free descriptive brochure, please check the seminar in which you are interested.
D Logic Design D Integrated Circuits D Digital Communications D Digital Systems Engineering

Name _ _ _ _ _ _ _ _ _ _ Title _ _ _ _ __ Company_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ __

Address _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ __

City

State

Zip _ _ __

~---------------------~

INFORMATION RETRIEVAL NUMBER 56

yes, mag tape terminals

It's true.
After helping a jillion feet of paper tape wind and unwind its way through communications systems everywhere, Teletype announces the addition of magnetic tape data terminals.
There are some basic advantages in both mediums. But as you are well awa re, the medium that's right for a system depends a lot on the application criteria.
Th e new magnetic tape data terminals have many operational features that make life less complicated for the operator.

New, modular line of Teletype® 4210 magnetic tape data terminals.

For example, take a look at the tape cartridge, which was specifically designed for reliability required for data transmission.
Its vital statistics are: 3" x 3" x 1".
It contains 100 feet of X" precision
magnetic tape.
It will hold 150,000 characters of data, recorded at a density of 125 characters per inch. The equivalent of a 1000 foot roll of paper tape.
This means that your data is easier to store, easier to handle, easier to work with than ever before. And it's reusable.

Teletype is a trademar k reg istered in the U.S. Pat . Off ic e.
94

ELECTRON IC DESIGN 11, May 24, 1970

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

The units have a "fast access" switch which will move tape forward or reverse at a speed of 33 inches per second . A digit counter provides a reference poinf to help locate various areas of the tape.
Four ASCII control code characters can be recorded in the data format to aid character search operations. When the terminal's "search" button is pressed, tape moves at the rate of 400 characters per second

Also magnetic tape adds high speed on-line capability to low speed data terminals.
You can zip data along the line at up to 2400 words per minute. For example: Take a standard speed Teletype keyboard send-receive set, and a typical typist. Add a new magnetic tape unit to this combination and the on-line time savings can pay for the magnetic tape terminal in short order.

Straight-through threading makes tape loading and unloading exceptionally easy.
They can send or receive at high or low speed. Or can be used independently as stand-alone terminals online.
If you would like to know more about this new line of Teletype magnetic tape data terminals, please write Teletype, Corporation, Dept. 89-15, 5555 Touhy Avenue, Skokie, Illinois 60076.

until the control code selected is detected. Then the terminal stops the tape automatically.
A "single step" switch is also provided which enables you to move the tape forward or backward one character at a time. In editing or correcting tape, you can send a single character using this feature.

You can take better advantage of voice grade line speed capabilities.
An operator can prepare data for magnetic tape transmission using the keyboard term inal in local mode. Then send it on-line via the magnetic tape terminal up to 2400 words per minute.
These new modular magnetic tape data terminals offered by Teletype are perfectly compatible with model 33, model 35, model 37 and lnktronic® keyboard send-receive equipment.

Teletype 4210 magnetic tape data terminal with 37 keyboard send-receive set.

machines that make data move E LECTRONIC D ESIGN 1l, May 24, 1970

INFORMATION RETRIEVAL NUMBER 57

TELETYPE
'H:'
95

MANAGEMENT

Engineers want more challenges, according to
this attitude survey. Many respondents say they not only become bored but even change jobs because the work is too elementary.

Richard L. Turmail , Ma nagement Editor
Are you bored with engineering? Are you in favor of an engineering union? Would you change your job title to match the work you do? How much more money do you think you should be earning? How much responsibility do you think your employer should assume for your continued education in technology? ELECTRONIC DESIGN has answers to these questions and many others as the result of a management survey conducted among a random sampling of 1000 of the magazine's subscribers. Of the nationwide sample canvassed, 55 per cent responded to our questionnaire. A further breakdown of responses by titles reveals that 2 in 3 respondents are engineers; 1 in 4 is a manager; 1 in 19 is a president or vice president; and 1 in 24 is a chief engineer. Over one-third of those who responded are in their 30s, while those in their 20s and 40s split half the total response.
Survey data
This report reveals the findings of a survey conducted in March, 1970, among subscribers to ELECTRONIC DESIGN. we mailed 1000 questionnaires to a random sample of our subscribers, and 550 replies were returned to us in time for tabulation and analysis. All information was treated anonymously.
The survey was designed to include responses from two engineers for each manager-a job title ratio that adequately reflects our subscription list.
The questionnaire contained 18 items. Engineers were told that the information they supplied on the form would be used in a management survey article designed to inform them how their attitude compares with that of their colleagues concerning their career needs, their complaints and their e~pectations in the engineering profession.
96

Nearly 1 in 2 respondents indicated that they lived on either coast, with those of the East Coast having a slight edge in numbers. The Midwest was represented by 1 in 6 engineers. Nearly 4 in 5 engineers like their employment location. Those who would rather live elsewhere woul d choose, in order of preference, the West Coast, the Southwest or the South, mainly because of the warm climates in those areas.
Spotlight ing the survey highl ights
Some of the attitudes that are generally assumed to be held by EEs-such as believing they're underpaid, and feeling that they've had a poor education-are generally confirmed by the response. Other responses, however, are more enlightening-and sometimes disturbing:
· Although you may find your present work satisfying or even challenging, 1 in 6 responding engineers admitted they were bored with their profession. As a matter of fact, EEs in their 20s and 30s indicated that they were the most bored of the four age categories listed. The main reason given for this engineering ennui is that an EE career is unrewarding, with little hope for advancement. Two other reasons listed are bad management and work that is elementary.
· One of the most tossed-about issues in t h e engineering community has been whether or not the engineer should unionize. In this survey, nearly 1 in 8 EEs said that their company is unionized. Asked "Do you favor an engineering union?" 1 out of 4 engineers who responded to the question said they thought a union would promote more benefits and job security for the EE, and more bargaining power with corporate management.
The remaining 3 of 4 responding EEs reported, in many cases angrily, that union affiliation would stifle incentive, degrade the engineering profession, create a barrier between the engineer and his manager, hinder the recruitment of new employees, and foster promotion on a seniority basis rather than on merit.
Engineers from New England and the South reported the greatest number of unionized com-
ELECTRO IC DESIG 11 , May 24, 1970

Profiles in challenges

Age group

)

20 - 29

) Like to build things

Other

)

Best salary

)

Teaches sequence

)

54% 28% 10% 8%
-;;-

Yes

50%

30-39

40-49
~~

· · · w r.fllm1..'{:..11 ·

_.,, ~

CHiI.ilTIT:!·miT· r~ rA":.r·

....

"'w;;,I

47%

49%

75%

33%

31%

12%

10%

' . · · · --"IHltHlJ

fiE)

""'

28%

24%

20%
-
5%
14%

) Unchallenging work

Advancing career

)

Underpaid

)

Yes

)

Unchallenging

)

) Too much time reading

34%

16%

18%

71%

20%

32%

40%

14%

16%

19%

18%

__.. __.,,

l~!l

""'

""l;ol

. ·~

22%

11%

97%

84%

a 87%

- 16%
[I{I] I J..'.t..l_i,,f,:w.J_J.-I_ITT)

13%

100%

rttt 1or:..1:n· Fm ~:nlnTili

) Interesting work

44%

29%

40%

39%

Money

)

29%

27%

23%

37%

Promotion

)

27%

23%

24%

) Socially-conscious work

21%

13%

16%

B c

Legend
A -None
B - Enough to keep up with the job
C - Enough to keep ahead of the competition
0 - Unlimited responsibility

53%

54%
46%
.,.

45%

panies, while the least number are reportedly in

the Southwest and West Coast.

East Coast engineers favor unionization most,

while Southwestern EEs favor it least.

· What's in a title? "Nothing," say some engi-

neers, while others would upgrade their titles if

given the option. Still others report they would

have to downgrade their title if it was necessary

to describe what it is they actually do.

Of the presidents and vice presidents repre-

sented in the survey, only 1 in 8 would change

his corporate nomenclature. Of course, the vice

presidents would most often change their title

to "division president," while many presidents

would change theirs to "retired." (So they said.)

Only 1 in 10 chief engineers reporting would

change his label to read either "department

head" or "engineering manager." Most chiefs are

satisfied with their designation-probably be-

cause the title of chief is all inclusive.

Of the managers, only 1 in 10 would rather be

called "consultant" or "vice president." Very few

respondents downgrade their titles at this level.

Engineers, however, apparently feel that they

are the most maligned of career men in the mat-

ter of titles. One in six of them would change

their name plates to read either "clerk" or "as-

sistant technician." Jobs at the engineering level

tend to be general in nature, with the usual load

of paper work and technician's duties.

· Regardless of title, however, most respond-

ing engineers agree on the amount of additional

salary they think they should be earning. One-

third, representing a plurality of the respondents

in each title category (excepting that of presi-

dent and vice president) believe that they should

be taking home $2500 more annually than their

present salary. Reasons given for the proposed

increase are that experience, responsibility, and

the high cost of living justify it.

Three of 10 of both managers and engineers

feel that their present wages are satisfactory. Half of the presidents and vice presidents are satisfied with their stipend, because, in most cases, they either receive a liberal bonus or own the company.
· And if you owned a company, how much of your profits should you invest in the continued technical training of your employees? In our survey, 1 in 2 of all responding EEs feel that their employer should finance enough training to keep them ahead of the company's competition. One in four EEs feel that their company should at least be responsible for keeping them up with the latest developments in their work.
While over 2 in 5 of all companies reported by responding EEs offer enough education to keep their engineers up to date on the job, 1 in 5 companies reported offer no training at all.
There is an interesting parallel between those EEs who are for or against unionization and the amount of company-sponsored training of-

...

en
~
u.0..
en
w ~

"c'C: ~

(.)
·.;::;

w"c'S>
~
zCl)

...
en
~

...

...u0

en
Cl)
~

en
Cl)

"'C

c:
~
~
<(
:2 :E

....s::.
:::J
~

3: :E

EL ECTRONI C D ESIGN 11 , M ay 24, 1970

B. C

-
A B CD

AB CD

A BCD

ABCD

ABC

62"
32'!1. 26%

fered. Seven of ten of those who are pro-union, believe that their non-union companies should keep them ahead of the competition or should take on unlimited educational responsibility. Yet significantly, according to our survey, pro-union EEs work for companies that, in 7 out of 10 cases, offer either only enough training to keep the EE proficient at his job or no education.
Responding engineers who are anti-union tend to believe that their company should not necessarily be responsible for much more than enough training to keep them up with their work. Yet, according to the report, most anti-union· engineers work for companies that offer more training than they expect to receive.
Job-hopping by age groups
As might be expected, the survey indicates that the younger the engineer the more likely he is to change jobs. In the past two years such
EL ECTRONIC DESIGN 11, May 24. 1970

was the case of half the respondents in the 20to-29 age category. The reasons most often given for the change were either "unchallenged by the work" or "advancing the career."
According to our survey, the percentage of job-hopping EEs decreases, however, as they grow older. Three out of 10 EEs in their 30s have changed company allegiance in the last two years, stating as their reasons: "to advance their career" or "underpaid." One in five engineers in their 40s switch jobs, usually for purposes of advancement, and only 1 in 7 of those respondents in their 50s had a change of scene, with the excuse of "finding more rewarding work."
What EEs say about higher education
Nearly half of the respondents reported that their engineering training in college did not prepare them properly for contemporary technology, at the time of their graduation. The reason most often listed for this lack of preparation is "not enough practical application of engineering fundamentals in college." "Poor choice of curriculum" is another reason often given. Poor instruction is least noted as a cause.
Over half of those EEs who indicated that their training was satisfactory said that they chose engineering because they like to build things and because the profession teaches them logical sequence.
Two apparent contradictions developed in the areas of job-hopping and career choice when compared with education tabulations. For example: one of the main reasons given by "poorly educated" EEs for choosing an engineering career was that they thought they "could earn the best salary." The second contradiction is the report that while "well-educated" EEs change jobs to advance their careers, "poorly educated" ones say they usually change jobs because they're
99

unchallenged by the work. Interesting also, is the finding that companies,
regardless of location, place exactly the same emphasis on the amount of training they offer their employees. They are, in order of preference: enough for the job; enough for the competition; none; and unlimited responsibility.
Perhaps help is on the way for the current crop of student EEs in the matter of insufficient practical engineering application in college. In an article published this year by the American Society for Engineering Education, an industry spokesman suggested, at a conference attended by representatives of both industry and education, that industry update both curriculum and student by creating more part-time employment opportunities for engineering students and faculty members. In reciprocation, the spokesman 1mggested the schools could create a more practical, industry-related curriculum.
The extracurricular engineer
A few respondents facetiously-perhapsconsidered "paying my family's bills" and "job hunting" to be worthwhile community activities, while others listed such disparate activities as the "third world liberation front," "underwater rescue team," and "converting text books to the Braille system" as being worthwhile projects.
One disturbing tabulation is that one engineer in five is not engaged in any community activity at all. Most of' those in that category plead that their engineering studies don't give them time.
One engineer in five, however, has found time to serve his church, and 1 in 7 busies himself in civic affairs, including such diverse activities as the chamber of commerce, law enforcement, conservation, voluntary fire department, parks commission, Red Cross, and the development of human resources. Scouting engages 1 in 10 engineers, and the PTA and other school associations hold the attention of 1 in 20 EEs. Additional activities listed include charities, social work, little league, little theatre, politics, YMCA, and volunteer teaching.
What about that generation gap?
It appears that the so-called generation gap certainly exists, but not on the scale we've been told-at least not in the engineering profession.
Of those who considered themselves qualified to answer the question, 1 in 6 engineers under 30 years of age said that he had trouble understanding his boss. The most prevalent reason for the misunderstanding, according to the young EE, is that his supervisor is either "unwilling or unable to make clear-cut decisions."
Only 1 in 12 managers over 30 years of age
100

reported having trouble understanding their under-30 subordinates. The reason most often given for this gap was "language" (a failure to express himself) or "attitude" (he thinks the world owes him a living).
Most respondents said they understood each other pretty well, either because the age difference between them was slight, or because most companies have a policy to air grievances.
That great advancement in the sky
Of all respondents, whether by age, title, or location, 2 out of 5 said that the most important consideration in the advancement of their engineering career in the next five years revolves around "more interesting work." One in four said that "more money" is the most important consideration, while another quarter of them said "promotions" were more important. The least listed consideration was "socially conscious work."
Sounding board vs the suggestion box
What then is the general mood and attitude of electronic design engineers, according to our survey results?
For one thing, even though some younger EEs are admittedly bored with their work, most respondents are EEs because they like to build things. And even though their working conditions are often undesirable, the vast majority of them still don't want anything to do with a union, mainly because it would stifle their incentive and degrade them as professionals. Those who are pro-union feel that their company should provide them with more training.
While most respondents feel they should be earning more salary, a surprisingly high percentage of them are satisfied with their pay.
Although the majority of responding engineers say they were "poorly trained," the reason they most often give for switching jobs is that they were unchallenged by the work.
It may be that the respondents to this survey took advantage of it to register all the opinions and gripes they couldn't air at work. If so, the survey is a sounding board that should be posted in electronics firms across the country where management, as well as other EEs, can read it. Who knows? It might even replace the suggestion box. ··
Our thanks
to those 550 engineers and engineering managers who took time out to complete our questionnaire. You have performed a nationwide service for EEs.
E LECTRON IC D ESIGN 11 , M ay 24, 1970

essthe priceof 's new counter

au es:
it averages time intervals to 10 picoseconds it has a built-in 0.05% integrating DVM it's de to 50 MHz, CW or burst its counter and DVM are easily programmable

Surprise : $1550. That modest amount buys a Hewlett-Packard timer/ counter that does things universal counters never did before. For example, it averages time intervals as short as 0.15 nanoseconds. So you can resolve to 10 picoseconds on repetitive signals.
That modest sum also buys a counter with a built-in integrating digital voltmeter. So it's the only counter that can measure internal trigger level settings or other inputs with DVM precision. Now you can measure 10 to 90 % rise times, half power points and other voltage-dependent time intervals. That means unprecedented simplicity, for example, in propagation

delay measurements. The counter also features four integration times. As a DVM, it provides three voltage ranges, 60 dB noise rejection and 0.05 % accuracy.
Even without these exclusive features, the 5326's are real bargains. They count to 50 MHz direct with seven-digit resolution (eight digits optional) , measure period and multiple period average and scale input frequencies by any power of 10 up to 108· They measure ratio and they totalize.
With programming and BCD output options, the 5326's fit easily into systems applications. Counter and DVM are DTL programmable through a common connector.

You can get all of these benefits in the 5326B for $1550, or buy the same counter, less the DVM, in the 5326A for $1195. Any way you look at the 5326 A or B-either is a great counter value. Your local field engineer has all the facts about HP's new IC counter line. Give him a call or write to Hewlett-Packard, Palo Alto, California 94304; Europe: 1217 Meyrin-Geneva, Switzerland.
ELECTRONIC COUNTERS

INFORMATION RETRIEVAL NUMBER 58

02003

'". '
:.(
THE MODEL 142-THE FIRST 10 MHz VOLTAGE CONTROLLED GENERATOR THAT IS ALSO AN OSCILLATOR, A PULSE GENERATOR,
AND A SIGNAL GENERATOR THAT SELLS FOR ONLY $595.
WAVETEK MARCHES ON! P.O. Box 651, San Diego, Calif. 92112 (714) 279-2200 TWX 910-335-2007 INFORMATION RETRIEVAL NUMBER 59

Product source Directory
Function Generators Squarewave Generators

This Product Source Directory covers Squarewave and Function Generators.
For each table t he instruments are listed in ascending order of one major parameter. The column containing this is color-coded white.
The following abbreviat ions apply to all instruments listed:

Abbrev.

Company

Square· Function wave

Argonaut

Argonaut Associates Inc. P.O. Box K Beaverton. Ore. 97005 (503) 292-3149

451

452

Datapulse Datapu lse Div.

Systron-Donner Corp .

10150 W. Jefferson Blvd .

453

Culver City, Calif. 90230

(213) 836-6100

EICO

Electronics Instrument Co., Inc.

283 Malta St. Brooklyn, N.Y. 11207

454

(212) 949-1100

EMR

EMA-Hatboro

East County Line Road Hatboro, Pa. 19040

455

(215) 672-1240

Exact

Exact Electronics Inc. 455 Southeast 2nd Ave. Hillsboro, Ore. 97123 (503) 648-666 1

456

457

General Radio Co.

22 Baker Ave. W. Concord, Mass. 01781

458

(617) 369-4400

Heath

Heath Co. Benton Harbor, Mich . 49022 (6 16) 983-3961

H-P

Hewlett-Packard Co.

1501 Page Mill Road

Palo Alto, Calif. 94304

(415) 326-7000

IEC Krohn -Hite

Interstate Electronics Corp. Data Products Div. 707 E. Vermont Ave. Anaheim, Calif. 92803 (714) 772-2811
Krohn-Hite Corp . 580 Massachusetts Ave. Cambridge, Mass. 02139 (617) 491-3211

459

Contact local sales office

460

461

462

ina- information not available

n/ a- not applicable

req- request

Unless otherwise specified, the power require-

ments for t he instruments are 105-125 Vac.

Manufacturers are identified by abbreviation.

The complete name of each manufacturer can

be found in the Master Cross Index below.

Abbrev.

Company

SquareFunction wave

Marconi Marconi Instruments

111 Cedar Lane Englewood, N.J. 07631

463

(201) 567-0607

Measure

Measurements, McGraw-Edison

P.O . Box 180 Boonton, N.J. 07005

464

(201) 334-2131

Microdot Microdot Instruments

220 Pasadena Ave. S. Pasadena, Cal if. 91053

465

(213) 682-3351

Philips

Phil ips Electronic Instruments

750 S. Fulton Ave. Mount Vernon, N.Y. 10550

466

(914) 664-4500

Radiometer Radiometer

The London Co.

811 Sharon Drive

467

Westlake, Ohio 44145

(2 16) 871 -8900

RCA

Electronic Components & Devices

415 S. Fifth St.

468

Harrison, N.J. 07029

(201) 485-3900

Servo

Servo Corp. of America

111 New South Road Hicksville, N.Y. 11802

469

(516) 938-9700

Tektronix Vari t ron

Tektroni x Inc. P.O . Box 500 Beaverton, 0 re. 97005 (503) 644-0161
Varitron Corp . P.O. Box 2594 St. Lou is, Mo . 63114 (314) 231 -9240

470

471

472

Wavetek

Wavetek 9045 Balboa Ave. San Diego, Calif. 92123 (714) 279-2200

473

474

ELECTRO IC D ESIGN 11 , May 24 , 19 70

103

Function Generators

Manufacturer

Model

FREQUENCY

Min.

Max. Rise

Foll

kHz µs

µs

Function

Voritron EMR Servo Philips Argonaut
Tektronix

WBFG 1641 1999 PM5168 LRG 051
162

0.02 0.02 0.001 0.005 0.01
o. 1

0.2

0.3

0.5

n/ o

ino

ina

o c b b
square romp
pulse del. pulse pulse gate sawtooth

H-P Krohn-Hite Krohn-Hite H- P H-P H- P Krohn-Hite H- P
Voritron
Exact

203A 4025 4024 3300A/3301 A 3300A/3302A 3300A/3304A 4100 3300A/3305A WBFG 505B

0.005 0.001 0.001 0.01 0.01 0.01
o. 1 o. 1
20 0 . 0001

0.2

100

inc

ino

100

inc

100

0.25

100

0.25

100

0.25

100

ino

inc

100

o. 25 o. 25

200

0.3

1000

0.05

Exact Exact Exact Exact Exact
Wovetek
Wovetek Wovetek Wovetek Wovetek

5000 502 503B 504B 500B 116 115 111 112 114

0.0001 0.0001 0.0001 0 . 0001 0.0001 0.0015 0.0015 0.0015 0.0015 0.0015

1000

0.05

0. 05

1000

0.05

1000

0.05

1000

0.05

0 . 05

1000

0 . 05

0. 05

1000

0 . 01

1000

0.01

1000

0.01

1000

0.01

1000

0.01

Wovetek Wovetek Microdot Microdot
Datapulse
Datapulse Wavetek Wovetek Wovetek Wovetek
Wovetek Microdot Microdot Microdot Microdot
Exact Exact Exact
H-P
Exact

113 110 F280A F270A 410 401 130 131 134 135
136 F220A F210B F240A F230B 120 123 126 3310A 100

0 . 001 0.005 0.01 0.01
o. 0002
0.02
o. 2
0.2 0.2 0.2
0.2 0.005 0.005 0 . 005 0.005
o. 1 o. 1 o. 1 o. 0005
0.001

1000

0.01

1000

0.01

1100

0.01

1100

0 . 01

0.01

2000

2000 o. 1

o. 1

2000 o. 1

o. 1

2000 o. 1

o. 1

2000 o. 1

o. 1

2000 o. 1

o. 1

3000

0 . 01

3000

0.01

0 . 01

3000

0 . 01

3000

0 . 01

3000

0.06

3000

0.06

3000

0.06

0 . 06

5000

0.03

5000

0.05

IEC IEC IEC IEC IEC Wovetek
Wove tek Tektronix
Tektronix

F55 F54 F53 F52 F51 144 142 Rl 16 115

0. 0005
o. 0005 o. 0005 o. 0005
0. 0005 0.001 0.001 99.9 100

10000 10000 10000 10000 10000 10000 10000 10000 10000

0.03

0.02

0 . 02

0.02

0.01-110 0.01-110 0

0.01-100 0.01-100 a

Tektroni x

284

lOOk lOOM lOOk

10000 1 GHz 10000

70x 10-6 inc

pulse sine square

Min.
v
1 ±lOµV 20 inc 0 0 0 0 50 50 25
0.3
ino inc
-40 dB -40 dB -40 dB ina 0.03 1 0
0 0 0 0 0 1 1 1 1 1
0.01 1 0 . 01 0.01 0.004 0.002 0.01 0.01 0.01 0.01
0.0001 n/ o n/ o n/ o n/ a 0.01 0.01 0 . 01 0.03 0. 01
n/ a n/ o n/ o n/ o n/o 0.0001 0 . 0001 ±0.02 0.02
0.01
o. 1
0.01

OUTPUT

Max.

Imp.

600

±10

500

600

100

1000

100

n/ o

1000

n/ o

1000

145

1000

30 10 rms 10 rms 35 p-p 35 p-p 35 p-p 10 rms 24 p-p 3 28

600 200/600 200/ 600 600 600 600 50 600 600 600

600

30 30 11 p-p
11 p-p 40 0.02 20 20 20 20

50 50 50 50
50/600 50/600 50 50 50 50

20 16.25 16.25 16.25 16.25 10 10 10 24 p-p 15

50
50/600 50/ 600 50/600 50/ 600 50 50 50 50 50

±10

± 10

o. 1

Atten. dB
n/o n/ o 111 ina n/ o
ino
40 inc inc 40 40 40
inc
40 n/ o 40
40 40 40 40 40 40 40 40 40 40
50 40 yes yes 40 40 40 40 40 40
80 yes yes yes yes 60 60 60 60 70
yes yes yes yes n/ o 80 80 inc
inc
ina

Misc. Features
o cd
i
z z y x w I
UV 0
gi
gh e ei gi
pu mu u
trigger
s
pushbutton 6 ou tputs qkr qr
0
b b b u u
b ekp nk ekm ek b
ef st e
al, aS al, a4 al, a3 al, a2 ol pu u
0 0

80
Price
s
126 63B5 3575 550 275
165
1250 1950 1200 730 945 945 550 1675 96 645
500-1200 385 545 565 495 845 745 545 695 795
595 44S 1545 1445 995 395 295 395 495 695
595 1085 785 1105 1095 295 345 495 595 445
1195 1085 895 795 595 895 595 1825 865
555

a. Functions, sine, square, triangle, pulse, sine squared, sawtooth.
b. Functions, sine, square, triangle. c. True arbitrary. d. Poper tape programming . e . Functions, sine, square, triangle, romp, pulse, burst. f. Internal sweep, de offset. Pulse variable in width and
repetition rote. Gating and triggering. g. Functions, sine, square, triangle, romp, pulse, hover-
sine, hovertriongle, half sine. h. Modular construction, price varies with requirement. i . VCF 50: 1. Gating & triggering. De offset. Three output amplifiers. j . Functions, si ne , square, phase shifted sine and square. k. VCF 100: 1. Gating & triggering, de offset, phase shift. I. Functions, sine, square pulse. Model 4130 ot $1295,
programmable. m. Phase lock generator. n. Functions. sine, square, triangle, romp, pulse.

o . Programmable pulse-paired, burst, gated, de layed & undeloyed generator.
p. Triggered tone burst generator. q. Functions, sine, square, triangle, si ne squared. r. All functions programmable. s. Functions, sine, squared, triangle, ± pulse, ± romp. t. Programmable frequency within one range. Sync output
and de offset included. u. Functibns, sine, square, triangle, romp.
Type 3305A, sweeper plug-in ot $975 included. 0-4 decades log sweep in any one range. Functions, sine, square, triangle, sawtooth. Type 3304A, sweep/ offset plug-in at $285 included. Programmable frequency withi n one range. Sync pulse output, de offset included. Type 3302A trigger/ phase lock plug-in ot $245 included. Programmable single period, multiple period, phase lock &
(crm tin111·d nn py. 106 )

10-1

IN FO RM ATI O N RETRI EV AL N UM BE R 6 0 ....

Big or little , one channel or two, FM or AM, square,

fast 40 nanoseconds. To handle low levels, we give you

triangular, sine or swept, the new family of Datapulse

80 db dynamic amplitude range.

function generators makes better waves. What's more, we've put a couple of new ideas to work in the design so that you get more \/\ tru V\ for your$$$.

You can field calibrate the 401 with a screwdriver, and we give you a calibrated 1V p-p square wave out for scope work. A switchable 40 db attenuator and your choice of

The little beauty on top, the Datapulse Model 401, sells for only $395 and gives you a dial accuracy of one per-

50 or 600 ohms output impedence further simplifies your life. You get 1000:1 voltage ~ontrol, too.

cent (that's about twice as good as the competition).

The other unit, the one with all the buttons, bells and

Frequency is 0.02 Hz to 2 MHz, and sine distortion

whistles, is the elegant and sophisticated Model 410. It

is only 0.25

takes up where the 401 leaves off.

percent inthe audio range . Square-wave rise time is a

Frequency is 0.0002 Hz to 2 MHz. Dial accuracy is 1% . Uniquely among function generators, the 410 allows you to both AM and FM outputs for an extra dimension in
wave generation. A built-in triggerable sweep generator

gives complete flexibility using either or both of the lf:ii~~~lll independently controllable 40V p-p output channels

to generate sine, square, triangle, sawtooth, and

swept waves. Price is a modest $995.

To arrange a demonstration or obtain more data, contact your local S-D man. Or address Datapulse Division, Systron-Donner Corporation, 10150 W. Jefferson Blvd., Culver City, California 90230. Phone (213) 836-6100.

CATAPULSE
DIVISION
DONNER

Squarewave Generators

Monufacturer
Argonaut EICO GR Heath Measu re GR RCA RCA EICO GR

Model
SRS020 377 13 13-A IG-18 71 1309-A WA -504A WA -44C 379 121 0-C

Min. Hz
o. 1
60 10 5 6 10 0.02 0.02 20 20

FREQUENCY

Max. Rise

kHz

µs

10 0 . 5

ina

50 o. 1

100 0.05

100 0. 2
100 o. l

200 1

200 ina
200 o. l

500 0.35

Fall µs
0.5 ina
ino
0.05
o. l
ina 1 ina ina inc

Min.
v
0.01 10 n/ a 0 0 n/ a n/ a n/ a 0 0

OUTPUT Max.
v
150 10 5 p-p 10 75 5 p-p 10 8 10 30 p- p

Imp. 0
a 1000 60 52 var 600 ina lOOk ina 2. 5k

Atten. dB
n/ a n/ a 0-20 - 62 to +22 s 0-20 n/ a n/ a n/ a
inc

Exact Krohn-Hite Marconi Tekt roni x Radiometer Heath Tektroni x Wavetek H-P Exact
Exact Measu re Wa vetek H-P H-P H-P H-P H-P H-P H-P

500B 4100 2103 106 RCO ll EU W- 2 7 114 130 209A 120
123 72 142 8005A 8003A 8002A 8010A 221A 220A 211B

0.000 1 0.01 10 10 10 20 100 0.2 4
o. 1

1000 1000 1000 1000 1000 1000 1000 2000 2000 3000

0.05
ina
30 0.012 0.05
o. 15
0.01
o. 1
0. 05 0. 06

0.05 ina 30
inc
0. 05
inc
0.01
o. 1
0.05 0. 06

0
inc 0.25 0.5 0
o. l
l
o. 1
- 20 dB 0.01

28 10 rms 2.5 120 l 10 10 20 20 p-p 10

600

inc

50/ 600 u

n/ a

ina

600

o. 1

3000 0.06

0. 06

0.01

5000 0 . 05

0. 05

0.0001 10000 0.02

0.02

0.0001 30

0.3

10000 10ns-2s 10ns-2s 0. 02

0.3

10000 0.005 0.005 0. 05

0.3

10000 10ns -2s 10ns-2s 0. 05

10000 12ns-ls 12ns-ls 0.02

10000 0.01 5 0.0 15 0

10000 0.0 15 0.015 . 0

-5

10000 0. 005 0.005 0. 02

75/ 500 s

Microdot
Marconi Microdot H-P H-P Tektro nix H-P

F324A

1370A

F323A

222A

100

1900A/ 1905A/ 1915A 25

2 101

2.5

1901A/ 1905A/ 1917A 25

10000 0.01

0.01

lOOµV 6. 32 p- p 50/ 600 yes

10000 0.4

0.4

0.001 73. 2 p-p 75-100 -50

10000 0.01

0.01

lOOµV 6. 32 p-p 50/ 600 yes

10000 0.004 0.004 0 . 05

25000 7ns-lms 7ns- lms ±]. 25 ±25

25000 0 . 005 0.005 0.5

25000 10ns-40ms lOns-40ms 0. 2

a. 50mA max imum current.
b. Sol id State. c. Also Si ne wave output. d. Programmable de. e. Three outputs. f . De offset. g. Output impedance on O. lV & l V range, 2200 on lOV
range . h. Programmabl e sync. i. Also 6000 unit, 1 Hz-1000 k Hz, 70 ns rise & fall time,
0.3-30V output . Attenuator ca librated in volts, 7 steps in l, 2. 5,- 5 sequence with vern ier . j. Remote frequency programming. Attenuation calibrated in volts. k. Pulse generator that may be operated as squarewave generator. Attenuation calibrated in vo lts, 7 steps from O. 1-lOV in 1, 2, 5 sequence. m. Plug-in pulse generator operated as squa rewave generator, programming is optional. Attenuation cal ibrated in vo_lts, 5 steps . Price includes one blank plug-in.

n. Plug-in pulse generator operated as squarewave generator,
programming is optional. Attenuation calibrated in volts, ±2. 5 to ±50V high Z source and± l. 25 to ±50V, 500 source. p . Pulse generator operated as squarewave generator. Attenuation calibrated in volts, 7 steps in 1, 2. 5, 5 sequence with vernier . q. Simu ltaneous + and - outputs. r . Two independent channels. Outputs may be combined. s . Attenuation calibrated in volts. t. Battery or Iine operated. u. Attenuation calibrated in volts, 4 steps, l, 10, lOOmV, l V. v. Continuously variable pulse width period & variable amplitude. w. Continuously variable period, duration, delay, amplitude and baseline offset. x. ± fast rise or high amplitude, sync input or trigger output. y. Expanded scale. Conversion from rms to p-p available. z . Expanded scale.

Misc. Features
a
c g s c b
b c
ef s t x bu c v
ch
d s
pq p p pr
i i
i
bz c by k n w m

81
Price
s
225 60 350 99 290 375 95 99 95 255
495 550 135 665 633 100 340 295 345 295
345 360 595 1100 470 700 1925 225 225 450
660 935 795 690 2570 req 1195

( continu ed from pg . 104 )
reference frequency. Sync pulse output included . Functions, sine, square, triangl e (2 outputs). y. Functions, sine, square, triangle (2 outputs). Type 330 1A plug-in at $30 included. Programmabl e freq uenc y within one range. Sync output inclu ded. z. Functions, si ne, square, pulse. Model 4024 frequency accurac y O. 5%, model 4025, O. 1% accuracy.

a 1. Functions, sine, square, ± ramp, triangle, ± pulse, variable width pulse.
a2. Gate & triggering included. a3. Gate, triggering and phase lock included. a4. Gate, triggering and sweep included. a5. Gate, triggering, phase lock and sweep included.

106

EL ECTRONIC D ESIGN l J, May 24, 1970

Let's face it: We won't knock them out of the ring tomorrow. But Microdot is hereby announcing its entry into the general instrument market. With a full line of solid state waveform generators and test oscillators. So, while the guys at H-P are still yawning with surprise, here are some facts for your consideration.
There are five models in each series. The waveforms cover a frequency spectrum of .005 Hz to 3 MHz. They offer a wide variety of output signals: sine, square, triangle, ramp . and sync pulse. Their versatility is evident in one model which offers you six instruments in one: function generator, VCO, sweep generator, sawtooth generator, pulse generator and tone burst generator. Other models provide full digital programming capability that is compatible with system interfaces using standard TTL and DTL positive logic.
The five test oscillators cover a frequency range

from 10 Hz to 10 MHz. Each instrument includes an output signal level monitor, and amplitude is controlled by precision step attenuation.
When Microdot takes on a giant of the instrument business, we don't fool around. These instruments are now in the hands of good reps all across the country, and inventory is available for immediate delivery.
So write. Or give us a call. We'll offer you complete literature, a demonstration if desired - and, of course, a pair of miniature boxing gloves inscribed with our motto (which might be yours someday): "Sock it to the fat cats. " After all, if we're going to get into a fight against these kinds of odds, we need all the friends we can get.
@MICRODOT INC./ INSTRUMENTATION
DIVISION
220 Pasadena Ave., South Pasadena, Calif. 91030

Here we were, busily competing with Amphenol on connectors, Belden on cable products, SPS and Esna on fasteners and Philco-Ford on RF instrumentation-
and now some wise guy decides to take on Hewlett-Packard.

INFORMATION RETRIEVAL NUMBER 61

E L ECTRON IC D ES IG I 1. M ay 24. 1970

10 7

Ideas For Design

Integrated op-amp pulse circuit has 18-second time constant

New-generation low-input current-integrated operational amplifiers lend themselves readily to long-tfme constant pulse circuits. In the following example, a monostable multivibrator with an 18-second time constant is achieved with a minimum of components, cost and complexity.
To understand circuit operation (Fig. 1), assume the output to be in its quiescent state at the positive saturation level of the LM 107. In that case, the noninverting terminal is at approximately (V.ad (Ra) (R2+ Ra). The inverting terminal is at Vo( = 0.56 Vat room temperature) .
If a negative spike greater than [ (RaVsat ) I
(R2+ R3 )] + V0 is brought to the noninverting terminal, the amplifier output will reverse states at the slewing rate of the amplifier (= 0.34vI µ.s). After this has occurred, the capacitor C1 will charge through R1 until the voltage across C1 is greater than ( - V,a, ) (Ra) / (R2+ Ra). At this point the amplifier, acting as a comparator, will return itself to the quiescent state.
However, as shown in Fig. 2, the one problem with this basic circuit is that the rel?et time is as long as the output pulse. To remedy this, it is

necessary only to add a diode and resistor in the feedback loop (D 2, R.,) in such a direction that the reset time constant is shortened as shown in F ig. 1 where

pulse duration =

R 1C1 In

( R R 2R 2+ 3

Vn ) , V sat

assuming t hat V.at = - Vsat·

Choose:

· R ., « R 1.

· (V.,nRa) l (R2+ RJ » V0 (to minimize effects of Vo changes with temperature).

· (Vsat Ra) l (R,+ Ra) « Vsat (to minimize ef-

fects of Vsat changes with temperature).

Reset time= R4C 1 In

( R 2 R+zR 3 -

VV 0 )
sat

Note that ion-implantation diodes have a lower

forward breakdown and a better temperature co-

efficient than standard silicon junction diodes,

and that they result in an even more stable out-

put over temperature.

Peter Berg, Group Supervisor, Dalmo Victor

Co., Belmont, Calif.

VOTE FOR 311

...,..____ Vo · ______.,:
I

500k RI

'='

I Ok

1. Reset time is shortened by addition of De and

R, to the feedback loop.

108

+v~; --,

-VsAT

---j

! I OUTPUT

I PULSE I

---:RESETTIME ....___

Vo Vc1

~ ' .·~/r::z,.''

STANDARD

~~'L------ IMPROVEO

2. Timing diagram indicates improvement obtained from circuit modification.

ELECTRONIC DESIGN 11, May 24, 1970

There isllt another like it. A 14-inch, single-pole, six position, 28-vdc. Helipot switch for PC boards.
Beckman® INSTRUMENTS, INC.
HELIPOT DIVISION Fullerton, Cal iforn ia 92634
INTERNATIONAL SUBSIDIARIES: AMSTERDAM; CAPE TOWN; GENEVA; GLEN ROTH ES. SCOTLAND; LONDON; M EXICO CI TY; M U NICH; PARIS; STOCKHOLM; TOKYO; VI ENNA

Model 374H $3.00 (1-9 pieces) Model 374 $2.75 (1-9 pieces)

INFORMATION RETRIEVAL NUMBER 62

ELECTRON IC D ES IGN 11 , M ay 24, 1970

109

IDEAS FOR DESIGN

Monolithic circuits provide inexpensive dual regulation
For powering analog circuits, such as op amps, both positive and negative voltages are usual ly needed. A low-cost approach to the problem of providing dual, regulated voltages is shown in the circuit diagram.
The heart of this design is a low-priced monolithic operational amplifier connected in a unity gain, inverting configuration. The monolithic voltage regulator provides the reference voltage, and the op amp provides negative current.
Because of the circuit arrangement, both output voltages-e01 and e02-can be controlled by the one regulator. The negative output stability will be dependent upon the positive output stability. This is acceptable because most operational amplifiers that could be powered from this circuit are insensitive to common-mode voltage changes.
The input-output voltage drop is 5 V and the maximum available current is about 25 mA. These two figures indicate a safe margin on power dissipation at maximum load current.

r.AJ..,.,....----..---1.__.......~ ~

l+15Vl

+
r~
R3 IOk

R4 IOk
>--------o(-15Vl 'o2

l-20Vl u------
UNREGULATEO INPUT

·01 · 1.BIRl+R2l/R2
102 · -t41o1lR4/R3

Dual regulated outputs, e0 1 and e02, are control led by a single voltage regulator. Maximum current
is 25 mA.

Richard C. Gerdes, President, Optical Electronics, Inc., Tucson , Ariz.
VOTE FOR 312

Low-voltage shunt regulator can power tunnel diodes

A simple circuit that has only three components can provide a low-voltage (0.3-V), lowimpedance (0.3 fl) power supply with a temperature coefficient on the order of 0.1 % / °C.
A high-gain general-purpose silicon npn transistor is used in a basic shunt mode, with a forward-biased germanium diode in series with its collector. As shown in Fig. 1 the output voltage V0 is initially the difference between the conduction potentials of the silicon base-emitter voltage (0.6 V) and the germanium-diode drop (0.3 V). The collector-to-emitter saturation voltage of Qi must be less than the difference.
It is more convenient, in practice, for improved thermal tracking of the two junctions to employ a diode-connected pnp germanium transistor, Qz, rather than a germanium diode. With both transistors in T0-18 cans, and collectors to case, a small heat sink maintains good thermal contact.
Base-emitter voltage of Qi decreases by about 2.3 mV/° C, tending to reduce V0 ; but the baseemitter voltage of Q2 decreases by approximately the same extent and opposes the change in V0 caused by Q1· Since the temperature dependent term is a function of junction current, the tern-

perature stability varies with load R L. The shunt configuration gives an inherently
low output impedance, as shown in Fig. 2, with RL = oo, R r, = 1 kfl and R i, = 220 fl , over a range of input voltages. The slope change from negative to positive output impedance is due to the finite current gain of Q 1. With Q i and Q 2 in a
02 , 2N966 (GERMANIUM l
1. Low-voltage shunt regulator uses germaniu·m transistor as diode to provide voltage difference.

110

ELECTRONIC D ESIGN 11 , M ay 24, 1970

· section PG5 -2/UF7

INFORMATION RETRIEVAL NUMBER 63

E LECT RON IC 0 ES IG 11 , M ay 24, 1970

111

IDEAS FOR DESIG N

0.325,t-----+---+--+--+-+-+-+-+-++----

0.320t-----+---+-+--+-+-+-+-t-++----+--l--+---l~l--l4~

SLOPE IMPEDANCE'. +0.60 l5mA TO 15mA)

0.315':-:----...._-......._ ..................L...........L..L.L~--....L.--'--....l.---IL..-L......IL....L...L.,!,----'---...L.-'--.................L............,

0.1

1.0

100

2. Plot of current vs voltage for different load conditions indicates low impedance of regulator.

= common heat sink and no load, V0 0.326 V at
25 °C and 0.310 V at 75 °C, corresponding to 0.32
= = mV/° C change. For R L 220 fl, V0 0.313 at
25 °C and 0.290 V at 75 °C, equivalent to 0.42
mV/° C. The supply was designed for powering a gal-
lium-arsenide tunnel-diode oscillator where 0.3 V

crosses the negative resistance region. With suitable choice of Q , and Q 2 it is also useful as a lowvoltage stable reference derived from a widely varying input voltage.
John M. Morrison, Design E ngineer, F erranti, Ltd, Edinburgh, Scotlan d.
VOTE FOR 313

High-frequency VCO uses TTL gates

One of the problems encountered when constructing high-frequency astable multivibrators from cross-coupled transistors is the shunt capacitance, Cb·· of each transistor. This capacitance sets an upper frequency limit on the multivibrator. The input circuit of a TTL gate presents only a small shunt capacitance to the circuit.
The circuit shown utilizes two TTL NAND gates, two capacitors and six resistors to form a voltage-controlled oscillator (VCO). With the

indicated component values and V in at 0 V, the frequency of oscillation is approximately 7 MHz.
The gates are biased at their turnover points (typically 1.4 - 2 V) by the voltage divider networks R,, R 2 and Ra, R·. These networks, together with C1 and C2 define the basic operating frequency. The gates are protected from negative-going input pulses by diodes D, and D2·
R,, and Rs provide the input connections for the oscillator control voltage V in · The frequency may be adjusted ±10 % by varying V in between

112

ELECTRONIC D ESIGN 11 , M ay 24, 1970

THREE NEW OP AMPS YOU HELPED DESIGN
AVAILABLE FROM STOCK
These new ampIifiers represent three of the best design alternatives emerging from today's technology . They have been created as a result of literally thousands of contacts between you, the op amp user, and Analog Devices' applications
engineers. Each is designed to maximize user value... that is, the best possible performance at
the lowest possible cost.

LOW COST FET
$12 Unit Quantities
At just $12 . in unit quantities, the Model 40 becomes the FET input op amp recommended in nearly all general purpose applications where high input impedance and low bias current are required. Two versions are offered whi ch differ only in initial offset voltage, input bias and difference current, and price. The encapsulated module measures 1" x 1" x 0.5''.

CHOPPERLESS DIFFERENTIAL
0.25µVfC
Newest in a series of low drift chopperless differential op amps, the Model 184 gives chopper-stabilized-like performance with the application flexibility of differential inputs, coupled with low cost. The 184 is recommended for an extremely wide variety of high performan ce applications and promises to become the industry standard for low drift requirements. Three versions are available, differing principally in drift characteristi cs and cost. Package si ze is 1.5" x 1.5" x 0.4" .

FAST SETTLING FET
0.6µs to 0.01%
Settling time of just 0.6µsec to 0.01 % accuracy makes the new Model 45 applicable to many high speed/fast settling requirements such as A/D and D/A converters, pulse height amplifiers, etc. Input parameters are characteristi c of FET differential input ampIifiers. Two versions are available with differing offset and drift specifications. Pack age si ze is 1.12" x 1.12" x 0.4".

ANALOG DEVICES, INC. · 221 FIFTH STREET · CAMBRIDGE, MASSACHUSETTS 02142 · TEL: 617/492-6000

r. ANALOG Ill
WDEVICES~

Data on these three amplifiers is contained in a new brochure featuring pre-selected Analog Devices' op amps. The amplifiers outlined in this short form catalog are those recommended for about 85% of the requirements evaluated by Analog Devices ' applications engineering department. Available without charge on request.

CAMBRIDGE· MASSACHUSETTS

INFORMATION RETRIEVAL NUMBER 64

IDEAS FOR DESIGN
+5 V and - 5 V. The basic operating frequency may be in-
creased by using smaller values of C1 and C2. By reducing the value of R5 and Ra, the frequency control range may be extended.
The inverting gates are optional, but they provide improved wave shape, and buffer the output from external clock loads.
A. C. Burley, A. V. Aellen, Senior Engineers, Hawker Siddeley Dynamics Ltd., Hertfordshire, England.
VOTE FOR 314

+5\IOLTS
RI lk

R2,R4-200 OHMS ALL GATES ARE 114 SN74001T:rl

.___ _ _O INVERTED

V1N

OUTPUT

Small shunt capacitance of TIL input gates allows ~his VCO to operate at 7 MHz.

Noise generator simulates radar return-signal 'grass'

Radar return-signal "grass" can be simulated in test setups by the following random-noise generator that operates in the range of 100 kHz to 8 MHz.
The circuit and its output signal are shown in the figure. The design uses one Motorola MC-

2 5k
Pl
MCl836P HEX INVERTER PKG.
8

Cl
200pF
C2

1836P hex inverter package that contains three circuits in each of two networks. A variable resistor and fixed capacitor in parallel connection control the network frequency. Each network is adjusted to a different frequency, and the coupling capacitors, C1 and C2, provide interaction between the two circuits. The result is a random noise output signal.
Potentiometers P1 and P2 are used to produce various "colors" of noise. P :i varies the output from 0 to 3.0 V peak to peak. Potentiometers are Spectro model 153-1. The capacitor C:i is used to couple the noise into a video output amplifier. Fixed resistors could replace the variable potentiometers if only one output level is desired.
Donald D. Lacy, Member of T echnical Staff, Logicon, Inc., San Diego, Calif.
VOTE FOR 315
VOTE! Go through all ldea·for·Design entries, select the best, and circle the appropriate number on the ReaderService-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 technique, 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.

5k OUTPUT
P3 (-o
C3 200pF
Random noise from 100 kHz to 8 MHz is adjust· able in content (P11 P2) and level (P8). Scope photo sensitivity is 2 µ,s x 1 V.

IFD Winner for February 1, 1970 George S. Oshiro, Design Engineer, Teledyne Systems, Los Angeles, Calif. His Idea "EXCLUSIVE-OR Gates Replace Choppers in Phase-Lock Loop" has been voted the Most Valuable of Issue award. Vote for the Best Idea in this Issue.

114

ELECTRONIC D ESIGN 11 , May 24 , 1970

Rugged Reliability is only one great feature of the new SPC-16 computer for your industrial automation
SPC-16 also performs li ke two computers in one ... hardware features accommodate real -time dedicated control in the foreground, while performing background batch processing.
SPC-16 blends an unmatched combination of fast response time and powerful computing capability with fail safe features and rugged industrial reliability.
And more importantly, SPC-16 can increase your productivity and profits with a minimum initial investment . . . with fast pay back.
Ask about the reliability of SPC-16 today ... it's backed by afull range of software packages, technical services and maintenance support.

Ask about other automation computers in the GA family. The SPC-12 for less than $5000. System 18/30 for under $20,000.

GENERAL AUTOMATION INC

1402

East ChestnU t'

Santa

Ana
'

Ca't" ~or:nt"a 1' /I

92701

(71 4) 835-4804

TWX (910) 595-1780

CALIFORNIA Los Altos. (415) 941 ·5966 Dra nge,( 714)633-0680 TE XAS
~~~::~~~/ni,5~j~1i~ 1 6
ILLINOI S Des Plai nes, (3 12) 298-4650 (Californ ia G.A. Corp.)
OHIO Cleveland , (11 6) 351 ·1175
GEORGIA At lanta , (404) 161-6103

ELECTRON IC D ESIGN 11 , May 24, 1970

INFORMATION RETRIEVAL NUMBER 65

PENN SYLVANIA King of Prussia, (2 15} 265 ·6525 MARYLAND Silver Sp·ing. (301 ) 587·7090
CONNECTICUT Stamford , (203) 325-3883 MASSACHUsm s Waltham, (617) 899-6170
INTERNATIONAL BELGIUM G.A.I. 24 Blvd. de l'Empereur Brussels, 13 78 03

ENGLAND G.A. Ltd. Wren House EPsohretsrm6o5u7t6h4Road. Esher.Surrey
m~~.~rronische Rechenanla1en
51 Aachen, Postfach 465 Werk: Verlautenheide Lindenweg 23 01405 -4444
G.A. GmbH. 6200 Wiesbaden Frauenlobstr. 9 06111·83073
11 5

HartAdvance Versatility

HART-ADVANCE RELAY DIVISION
CAT. NO. W115A3-00I
COIL 115V. 60 CTC. LOAD 25 AMP.

W SERIES RELAYS

KEPCD TALKS
POWER SUPPLY
TECHNDLDGV:
HOW TO TEA C H AN ANALOG VO LTAGE , DIG ITA L TR IC KS
The output of a power supply is an infinite continuum of possible settings limited only by the resolution of the control and your steadiness of hand. To subject such an analog continuum to digital control requires that we divide it into digits of information which can be machine-processed (as opposed to your personal tweaking of a control). The digits must be timed and sequenced correctly-stored if necessary-and then used to select command levels for a programmable power supply.
The device to do all th.is may take one of several forms. It may be a low level D/A employing semiconductor switching with some sort of capacitive or transformer signal isolation-or it might be a high level D/A, operating at the output voltage level, using mechanical means to switch fixed control resistors.
The first method obtains speed at the expense of resolution and stability. The best semiconductor switches exhibit relatively large "on" resistances and a distinctly noninfinite "off' resistance. Moreover, at low levels, noise limits the resolution. Typically, this type of D/A produces a small (under IOV) analog output that must be amplified in a linear manner by the power supply that it controls, noise and all.
Kepco has chosen the second method. Cycle times don't break any speed records but are in line with the speed of the fastest programmable power supplies. We use reed relays arranged in decades of four each, controlling precision , wirewound, low TC resistors scaled 8- 4- 2- 1.

One switching decade shown

Range Control

Smallest Enclosed Power Relay Available 25 Amp, 250 Volt, 2 Circuit
U/L and CSA RECOGNIZED-Only 11/i sq. in. x 1 'l's" high, ideal for single and two phase switch-
ing. Features AMP quick connect terminals with companion U/L recognized socket available. Many, exclusive patented features.
HEAVY DUTY and RUGGED-W Series relays are DPST general purpose relays with 25 amp contact ratings, able to handle 1 and 2 HP motor loads easily.
MOUNT UPI-Optional mounting ... choice of panel, side or socket.
APPLICATIONS-For appliances, automation equipment, motor starting, vending machines and panel boards.
For full details, write today for the General Catalog.

116

HART-ADVANCE RELAY DIVISION
OAK ELECTRD/NETICS CORP· CRYSTAL t..AKE. ILL 60014 PHONE: 815-459-5000 . TWX: 910-634-3353
INFORMATION RETRIEVAL NUMBER 66

OUTPUT
0
0
KEPCO "S DIGITAL PROGRAMMER CON NECT S TO ANY PROGRAMMABLE POWER SUPPLY (SHOWN BY THE BOLO CIRCUIT! UP TO 1000 VOLTS
Because the D/A is working right at the output level, controlling voltage l: 1, you can divide voltage into some mighty small pieces. A three-position movable decimal point helps. Model DPD- 3 , for instance , will control 0- 1000.00, 0- 100.000 and 10.0000 volts! And, because the reeds firmly connect precision-fixed resistors- with a low "on" resistance- directly to the power supply's control loop, you can leave the setting indefinitely, confident that it will stay right on the nose.
Transients are avoided by a two-stage switching system. A command change is initiated by first opening the mercury-wetted relay to throw the power supply onto an analog memory "hold" capacitor, while the individual decade reed switches open and close in a dry circuit, establishing a new precision command level. The mercury-wetted relay then cycles closed , permitting the supply to slew to its newly established voltage level.
There are seven different D/A' s available with separate 3, 4 and 5 digit storage registers, plus a handy keyboard for manual entry. These will teach digital tricks to any of some I 02 different programmable power supplies ranging up to 1000 volts.

EP C D

For complete sp~ifications

and appl1cat1ons notes,

write Dept. DB- 5

KEPCO, INC. · 131-38 SANFORD AVENUE· FLUSHING, N.Y. 11352
(212) 461-7000 · TWX # 710-582-2631

INFORMATION RETRIEVAL NUMBER 67
EL ECTRONIC DESIGN 11, May 24, 1970

New Products

Content addressable memories match input to stored data

Signetics Inc., 811 E. Arques Ave., Sunnyvale, Calif. Phone: ( 408) 73.9 -7700. P&A: 40¢ to 70¢ per bit, 80¢ to $1.40 per bit; stock.
Two new monolithic arrays form a unique family of memory products known as content addressable memories (CAMs). They are the high-speed model 8220 and the low-power model 8222 elements.
Content addressable memories are memories in which data can be associated. That is any data placed at the input of the memory is matched against the memory's stored data. The memory responds with a match or mismatch answer.
With these two new CAMs, data can be written into them just like any other read/ write memory and they then provide the association of input to stored data. They also give the address location of what word in the memory matches the data presented at its input.
Until now, to use data in a read/ write memory, the stored data had to be processed after the input data was read in. The use of computer software was a common technique.
The model 8220 high-speed element can perform an associate function in 25 ns, while the model 8222 low-power element dissipates on ly 300 mW maximum and 200 mW typical.
Both elements incorporate the necessary addressing logic and contain eight identical memory cells, which are organized as four words, each being two bits Jong.
With reference to input and stored data, both can be conditioned to perform the following functions: associate, write-in only and readout only.
Write-in can be done simultaneously to all bits, or to one bit at a time. The readout function of the stored information is perform ed on one word at a time.
Cell selection for read and write functions is obtained by the proper

addressing of input and output lin es.
The cell's output structure for each element is of the "bare collector" variety which allows cells to be mutually connected.
This feature permits the memories to be expanded in two directions-in word length and in the number of words when multiple packages are employed.
Each array contains 100 discrete gates and each has a circuit structure of the familiar TTL type (DCL family ) and is fully compatible with TTL and DTL input and output structures. Both memory elements can be used in a computer data processing associative process and in stored comparator applications.
Each element can also be configured as a self-learning memory. In this mode, the memory does not issue a write command for the output if a matching input word is contained in its storage.

If however the input word is not contained in the storage, the memory will "learn" to put the input word into storage for subsequent associative functions.
In the self-learning configuration, the element is always in the associate mode when no word has to be written into storage.
Monitoring the output lines provides a convenient wa:r, of decoding an available address.
A clear command totally erases the memory contents. The process of selectively erasing individual words is also a simple one.
The model 8820 is available in 16-pin flatpacks in either temperature range of - 55 to +125 ° C or 0 to + 75 °C. It is also available in a 16-pin dual-in-line case for the temperature range of 0 to + 75 °C.
The model 8222 is available m the following versions: 8222B (O to +75 ° C) and 8222R ( - 55 to +125°C and 0 to +75°C).
CIRCLE NO. 250

ELECTRONIC DESIGN 11, May 24, 1970

117

ICs & SEMICONDUCTOR S

Monolithic op amp

has FET inputs
~· a.n-.~~1 -~~:~.

30pF MOS Capacitor

lL!·

~:·.&I~it~'l [§ ...._-.i
ri-D!1~1IkDlliliU,jnnw~

J·FET Trans is tor

J·FET T r a n s is tor

Radiation Inc., Microelectronics Div., sub. of Harris-Intertype .Corp., Melbourne, Fla. Phone: (305) 727-5412 . Price: $82.50.
Incorporating an on-chip resistor ladder network, the RI-1080 monolithic digital-to-analog current-mode converter can handle up to eight bits of data at the same time. Depending on the external voltage reference, this new MSI device can operate in three modes:' bipolar, unipolar positive or unipolar negative. Operating tempera-
t ure range is - 55 to + 125°C.
CIRCL E NO. 2 52
Dual transistor gains up to 1500

Silicon Gen eral Inc., 7382 Balsa Ave., W estminster, Calif. Phone: (714) 839-6200. P&A: $5 .30; stock.
Permitting fast low-cost fabrication of custom ICs, a new monolithic IC breadboard, the SG3801 Qu ikChip, contains over 50 separate components of various types and values. These components can be interconnected with a wire bonding machine, allowing the circuit designer to construct prototypes without the customary reliance on the semiconductor manufacturer.
CIRC LE NO . 2 54

Faii·child S emiconductor, 313 Fairchild Dr., Mountain View, Calif. Phone : ( 415) 962-3563. Price: $37.50 01' $73.50.
Hailed as an industry first, the µ,A740 is a monolithic FET-input operational amplifier that operates with 200-pA maximum current into either input. In addition, the device features equivalent betas of more than 15,000 and an input
impedance of 1012 n. Unity-gain slew rate is 6 VIµ, s; voltage gain
is 120 dB.
CIRCLE NO. 251
Int ersil Inc ., 10900 N. Tantau A ve., Cupertino, Calif. Phone: (408) 257-5450. P&A: $6; stock.
Suited for both radiation-hardened and industrial applications because of its dielectrically isolated construction, a dual monolithic super-beta transistor guarantees a beta of greater than 1500 at a 1-µ,A base current. Model IT1 24 also features a capacitance of 0.8 pF and a unity-gain crossover frequency of 100 MHz. Current offset is 0.5 nA.
CIRCLE NO. 253
Monolithic breadboard allows customized ICs

Dual transistors boast 1.5,mV match
Qualidyne Corp ., 3699 T aho e Way, Santa Clara, Calif. Phone: (408) 738-0120 . A vailablity: stock.
A complete line of high-gain npn and pnp dual transistors features a matching specification (baseemitter voltage ) as t ight as 1.5 mV. These devices cover almost a ll of the popu lar dual 2N numbers now in use-over 150 transistors in all. Gains are greater than 200 w ith a 10-µ,A base current, and output capacitance iR aR low as 1 pF. Unity-gain crossover frequency is greater t han 200 MHz.
CIRCLE NO. 255
Transistor for 84¢ accommodates 30 W
Power Physics Corp., P.O. Bo:r 626, Eatontown, N .J. Phone : (201 ) 542-1393. P&A: 84¢ ; stock.
Sell ing for 84¢ each in lots of 100 to 999, a new si licon npn power transistor can typ ically handle collector-emitter voltages of 140 V, Type 2N3054 offers a power capabi lity of 30 W. Peak collector curren ts range from 3 to 7 A. The unit, which is packaged in a T0-66 metal can, is expected to be used in power supplies, oscillators, voltage r egul ators and amlifiers.
CIRCLE NO. 256
Digital ICs clamp inputs
Sylvania E lectric Products Inc., sub. of Gen eral T elephone & Electronics, 1100 Main St., Buffalo, N. Y. Availability: stock.
Now avai lable are 14 new series 7400N TTL integrated circuits offering the advantage of clamping diodes on all inputs for reliable short-circu it protection. Fully interchangeable with competing lines, t he new devices come in a standard all-ceramic package w ith tapered lead ends to faci litate socket insertion. Circuit functions include NAND gates, :AND-OR-INVE RT gates, and dual D and J -K flipflops.
CIRCLE NO . 257

118

ELECTRONIC D ESIGN 11, May 24, 1970

Counter/driver IC runs readout tubes

General l nstnimPnt Corp ., 600 W. John S t ., Hick sville, N .Y. Phone: (516 ) 783 -8333. Price : $20.
Sa id to do the job of three conve ntional I C packages, a BCD co unter/display-dri ver ca n power a s in gle seven-segment nume ri c indicator by itself. i\Iodel 1056 is an l\IOS I C that contains a s in gledecade up-down BCD co unter, a storage register , a BCD-to-sevensegment decoding matrix, and display drivers. It is suppli ed in a 24lead dual-in-lin e package.
CIRCLE NO . 258
Plastic complements dissipate 15 watts
Geneml Electric Co., S emiconductor Products Dept., 1 Rive1· Rd., Schen ectady, N .Y. Phone : (315 ) 456-2396. P&A: 45 ¢ to 65¢ in quantity; stock.
Offering collector satu rati on Yoltages of 0.5 V at 3 A, two new 15-W co mplementa r y Power Pac tra nsistor s, the D44C and D45C. a r e rated at 30, 45 and 60 V. Th ese pla tic uni ts haYe typical sw itch in g ti mes of less than 600 ns. The D44 C is an npn dev ice, while the D45C is a pnp devi ce.
CIRCLE NO . 259
ELECTRON IC 0 ES IG I I. May 24. 1970

How small
are your
EMI problems?
An EMl/RFI problem used to be one of the least appealing facts of circuit life. Add the requirements for a small unit with high attenuation characteristics and you were in trouble. Not anymore. Today, you'll find lasting happiness with two proven USCC series of miniature filters. Both provide up to 70 dB of attenuation.
Series 2000 suppresses conducted noise from SCR's, switches, relays, motor commutators, etc., in low voltage de lines from 10 kHz to 10 GHz. Available in Pi, L or T section units for 50/100/200/300 WVdc and 115/230 Vac in 10 current ratings and 2 thread lengths.
Series 3000 subminiature units are for use where size, weight and reliable performance are critical as in microwaves, communications and airborne equipment. Available in Pi or multi-section units for 50/100/ 200 WVdc from 10 MHz to 10GHz.
Send for the complete details in a series of technical catalog sheets: U.S. Capacitor Corporation , 2151 No. Lincoln Street, Burbank, California 91504. Phone : (213) 843-4222. TWX: 910-498-2222.
-
Other reliable USCC EMl/RFI products: general purpose filters , signal line/communications filters, power line filters and cabinet assemblies, data processing filters, and special/custom filters.
INFORMATION RETRIEVAL NUMBER 68
11 9

INFORM ATI O N RETRE V AL NU M BER 69
120

ICs & SEMICONDUCTORS
Arithmetic logic unit adds 16 bits in 42 ns
Fafrchild Semiconductor, 313 F afrchild Dl'ive, Mountain l!iew, Calif. Phon P: ( 415) 962-5011. Pric e: $14 to $30.80.
Model 9340 four-bit arithmetic logic unit is a new MSI circuit that can add two 16-bit numbers within 42 ns when connected in multiple. The unit can also perform several other functions like OR, AND, subtraction, and equivalence. Because the device includes carry-lookahead circuitry, the user can add up to 16 bits with only four 9340s and no other package. It comes in military or commercial versions, either fiatpacks or DIPs.
CI RCLE NO . 26 0
Zener diodes accept 50 W
Electronic Transistors Corp., 15313 Northern Blvd. , Flushing, N.Y. Phone: (212) 539-6700.
Offering tolerances of ± 20, ± 10 and ± 5%, a new line of generalpurpose zener diodes can dissipate power levels as high as 50 W. This new family of r ectifi ers comes in JEDEC T0-3 packages or in studmounted D0-5 packages. Their operating temperature range is
- 65 to + 175°C; voltage ratings
range from 4.7 to 200 V.
CIRCLE NO . 2 6 1
Dual sense amplifiers strobe independently
National Semiconductor Corp., 2900 Semiconductor Dr., Santa Clam, Calif. Phone: ( 408 ) 7325000. P&A: $7 or $9 .10; stock.
Intended for use with small core memories having as many as 4000 words, two new monolithic dual sense amplifiers feature independent strobing. The LM354A and LM354 are fuctionally identical. but the LM354A has a tighter guaranteed input threshold voltage uncertainty. Typical outputs for the circuits are 3.9 V for a logi cal 1 and 0.25 V (0.4 V maximum ) for a logi cal 0.
CIRCLE N O . 262
ELECTRONIC D ES IGN 11 , May 24, 1970

Photosensor chip can drive directly
Dionics Inc., 65 Rushmore St., Westbury, N.Y. Phone: (516) 9977474.
Dielectrically isolated for good high-frequency response and radiation resistance, a new line of npn silicon matched - pair transistor chips provide a close parameter match, from 10 µA to 1 mA. Types 3423 and 3424 have their collectors isolated from each other and from the bottom of the chip. The chips are gold-backed, permitting conventional eutectic die-bonding.
CIRCLE NO. 264
Tiny thermistors
give up to lOku
Texas Instruments Inc., Components Group, P.O. Box 5012, Dallas, T ex. Phone: (214) 238-2011 . P&A: $2.68 or $3.70; stock.
With a power output that is spectrally compatible with silicon sensors, two new pn gallium-arsenide light sources provide a minimum power output of 1 mW (the TIL24 ) or 0.4 mW (the TIL23). The units cover both the military and industrial temperature ranges. Both light sources have a narrow light beam emission at an angle of 35 degrees.
CIRCLE NO. 266
ELECTRONIC D ESIGN 11, May 24, 1970

RCA / Electronic Components, 415 South Fifth St., Harrison, N .J. Phone : (201) 485-3900. P&A: $2.95; stock.
Combining a photosensitive section, an amplifier and two 100-mA driver transistors on a single chip, the CA3062 monolithic li ght sensor can drive a lamp, relay or triac without additional amplification. The unit operates either as a normally OFF or normally ON photoswitch. It comes in a hermetic 12lead T0-5-style package.
CIRCLE NO. 263
Transistor chips match to 10 µA
~~..;--~....,..~~~--,
Sensitron Inc., 225 Paularino Ave., Costa Mesa, Calif. Phone: (714) 540-4160.
Called micro-silicon devices, a new line of thermistors, the size of a 0.1-in. sphere, are available with resistances from 10 to 10,000
n. Series 125 units are available
with radial leads or radial-opposed leads. Maximum operating temperature is 150 °C, and nominal temperature coefficient is 0.7% /°C. The devices are designed for semiconductor circuit compensation.
CIRCLE NO. 265
Light sources put out 1 mW
INFORMATION RETRIEVAL NUMBER 70 ·

Alone in its class
Johanson products stand alone as a symbol of leadership. Even an unpracticed
eye can see the differences between a
Johanson capacitor and its counterpart. Such things as ultra-high Q (useable at
microwave frequencies) ... ultra-high
stability (0 ± 15 PPM/'°C) ... and "sizes"
for hybrid and microcircuit as well as for conventional applications .. . these and other integral design advances attest
superiority. Send for a complete Johanson
catalog. Let a Johanson product Model 5801 help your product be a leader!
(actual size)
Johanson Manufacturing Corporation Rockaway Valley Road, Boonton , N.J. 07005
(201) 334-2676 ·Telex : 13-6432
PHOTO BY PHI LIP GEND REAU FROM NATI ON AL AUDUBON SOCIETY

MODULES & SUBASSEMBLI ES

Fast d I a converters
settle down in 25 ns
Burr-B?"Own R esearch Corp., International Airport Industrial Park, Tucson, Ariz. P hone: (602) 2941431. P&A: $110, $90, $70; stock to 4 wks.
A line of three new chopperstab ilized low-d r ift operational amplifiers include diffe r ential inputs . Models 3354/ 25, 3355/25 and
3356/25 drif t 0. 2, 0.5 a nd 1 µ.V/° C,
respectively. Input bias currents a r e 20, 50 and 50 pA, respectively. Open-loop gain is 140 dB at de.
CIRCLE NO. 268
Low-cost FET op amp chops price to $17
Optical Electronics, Inc ., P.O. Box 11140, Tucson, Ariz. P hone: (602) 624-8358. P&A: $87; stock.
The model 5882 multiplier is a low-cost four-q uadrant analog unit with a wide bandwidth of de to 30 MHz. Its features include a maximum untrimmed offset voltage for both X and Y inputs of ± 2 V. Also feat u red is a null rejection character istic of 73 dB at 5 MHz. Both inputs have an impedance of 4 kn and a dynamic output range of -10 to + 10 V.
CIRCLE NO . 270
122

Datel Systems Corp ., 943 Turnpike St., Canton, Mass. Phone: (617) 828-1890. P&A: from $195; 2 wks .
Containing buffer logic, switches, a ladder and voltage reference in a single package, the DAC-H series of d/ a converters feature an output settling time of 25 ns to ± 0.1 % of final value. This allows for an update word rate of 40 MHz. Output is ± 2.5 mA full scale with a voltage compliance of ± 1.2 V, and output linearity is ± 2.5 µ.A with a 5-µ.A resolution.
CIRCLE NO. 267
Chopper-stable op amps are differential units
~\
C>
J
GPS Corp., 14 Burr St., Framingham, Mass. Phone: (617) 8750607. P&A: $17; stock.
Including an adjustable input offset voltage of 2 mV and an input bias current of 50 pA, the lowcost model 801 differential FETinput operational amplifier retails at $17. Other characteristics are an open-loop gain of 100,000, full output frequency of 50 kHz, a slewing rate of 5 VIµ. s and an input drift of 100 µ,V/ V. The output is ± 10 Vat ±20 mA.
CIRCLE NO. 269
Wideband multiplier spans de to 30 MHz

Low-cost multiplier downs price to $29.50
T eledyne Philbrick/Nexus Research, Allied D?·. at Route 128, Dedham, Mass. Phone: (617) 3291600. P&A: $29.50; stock .
Providing an output of ± 10 V at frequencies to 40 kHz, the model 4452 low-cost four-quadrant multiplier/ divider retails for only $29.50. Its voltage range for either X or Y input is ± 10 V and each input's impedance is 30 kn. Operation to 400 kHz is possible with dcrating of parameters. The unit measures 1.5 by 1.5 by 0.6 in.
CIRCLE NO . 271
DecoderId river display slims depth to 1 inch
Integrated Circuit Electronics, Inc., 237 Riverview Ave., Newton, Mass. Phone: (617) 891-4311. Price:· $49 .50 (3 decades).
The D-4000 series decoder/ driver display features behind-thepanel depth of only 1 in. It contains a bezel with filter lens, decoder, driver circuitry and replaceable low-voltage low-power readout tubes. It is IC-compatible and interfaces to four-line BCD levels. The use of a single-connector termination eliminates wiring.
CI RC LE NO. 2 72
ELECTRONIC DESIGN 11, May 24, 1970

High-voltage supply drives price under $30
.Venus S cien tific Inc., 39 9 Smith S t ., F armingdale, N .Y. Phone:: { 516) 293-4100. Price: under $30.
Supplying an ou tput of 15 kV at 150 µ,A, t he new all-s ilicon L-15 low-cost h igh-voltage power supply for computer and CRT displays boasts a price of less than $30 . It is a de-to-de converter operating from 15 V de and is short-circuit and arc-over protected. The input is protected against reverse polarity and the output has less than
1% of pk-pk ripple.
CIRCLE NO. 273
Tiny low-cost op amp is priced at $26
Z eltex, Inc., 100 Chalomer Rd., Concord, Calif. P hone : (415) 6866660. P&A: $26; stock.
F eaturing 15 pA of input current, a 100,000 :1 common-mode rejection ratio and frequency response of 4 MHz at unity gain is the tiny low-cost FET-input ZA80 2Ml operational amplifier that measures 1 by 1 by 0.4 in. and costs $26. Maximum input voltage drift
is 50 µ,V/° C for the temperature
range of -25 to +85°C.
CIRCLE NO. 274
ELECTRONIC DESIGN 11, May 24, 1970

New
low cost LED Vactrol photon isolator

F--==j

c~ ...-.... I

~
as low as $4.20 each 1n 1,000 quantities

· all solid state

· ideal for environments where shock

· 4 types of photoconductors

and vibration are a problem

combined with LEDs

· applications include photo-

· hermetically sealed T0-5 enclosure

choppers, linear isolators, noiseless switching , SCR and triac turn -on, audio level

· unlimited life-no filaments controls, etc.

Part Number

LED
Cu rrent (ma)
(1.6Sv typ .)

Max. Cell Resistance

PHOTOCELL
Typical Rise Time (ms) *

Decay

VTL2C1

10 K n

3 .S ms ··

VTL2C2

soo n

3.S

SOO ms t

VTL2C3

2 Kil

2.S

3S ms t

VTL2C4

· To 63% conduc tance

?Sil
··To 1 meg

6 .0
t To 100 K fl

1.S sect

J-3 P HOTOCELL
2 4 LED
2J- }I r------{[-I--,J
i~ l

+ I

~---------.J

Va ctec confines its production activities entirely within the United States.

Advanced m echanized techniques provide highest quality at prices competitive

with other manufacturers anywhere in the world.

VACTEC, INC.
2 4 23 No rthline Ind. Blvd. M aryland Heig hts. Mo. 63043 Phon e: ( 31 4 ) 872 -8 300 Write for Bullet in VTL2 C Spe cializing in st an dard Cd s. Cdse, and Se sells ; custom engineering for every photocell need .
listed in £BG under "Semi-Conductors" and in £EM Sec. 3700.
INFORMATION RETRIEVAL NUMBER 71
123

COM PO NENTS
Low-cost LED lamp _sells for only 50¢

Indicator light for ICs works from logic levels
·-

Spdt thumbwheel switch is but 0.225-in. long

HP1dett-Packard, 1501 Page Mill Rd., Pcilo Alto, Calif. Phone:

( 415 ) 326-7000. P&A: 50¢; 30 days.

Designed to replace miniature

incandescent lamps, the 5082-4403

red light-emitting diode features a price of only 50¢ in large quanti-

ties. It requires on ly 1.8 V at 20

mA to operate and provides high

visibility over a broad angle. This

GaAsP lamp self-mounts in panels

or on printed circu it boards and is

compatible with most integrated

circuits.

CIRCLE NO. 275.

r-----------

GuARANTEEo UNIFORMITY

IN ELECTRICAL, PHYSICAL

CHARACTERISTICS

· Available in 2, I, 1/2 and Y4 watt sizes. · Uniform from resistor to resistor, order to order. · 100% tested for resistance value. · Solderability, load life and humiditytemperature characteristic checked. · Impregnated to assure moisture resistance. · Write for literature.
INFORM A TION RETRIEVAL NUMBER 72
124

Dialight Corp., 60 St ewart Ave., Brooklyn, N .Y . Phone: (212) ) 4977600.
Designed for integrated circuits, a new transistorized indicator light operates directly from TTL, DTL and RTL modu les thereby eliminating the need for a special power supply and interface circuitry. It includes all driving circiutry within its housing and accepts wide voltage swings without increases in signal current. Lamps used are T-1-3/4 incandescent types.

CIRCLE NO. 276

r----------------,

I I

TWO, NEW

I I I

POWERFUL CERAMAG9 FERRITE MATERIALS

I I

24H 5000

24K 7500

PERM

I I I

· True 5000 and 7500 permeability ratings.

I · Both 24H and 24K stay at designated

perm over a wide range of sizes.

· Curie point for 24H and 24K is 175°C, typical.

· Precision engineered materials produced through exact processing, density checks and controls.

· Terrific inductance in a small size.

· Residual magnetism is 850 (24Hl and 700 (24Kl gauss.

· Write for data about these production materials.

INFORMATION RETRIEV A L NUMB ER 73

Wilbr echt Electrnnics, 240 Plato Blvd., St. Paul, Minn.
On ly 0.225 inches long, the model 2000 spelt switch sets new standards for ultra electromechanical miniaturization. Its uniquely designed detent produces large-size switch feel. The use of precious metal contacts and wiping action results in low contact resistance. It is enclosed to ensure long li fe of over 50,000 cycles. For added flexibi lity it is avai lable in a variety of colors.

CIRCLE NO . 277
,-----------

1 ENVIRONMENT PROOF

ROTARY SWITCHES

I
I

Series 600 1%" Dia. - Series 100 11/a" Dia .

· Both index mechanism and electrical

sections are completely enclosed.

· Corrosive atmospheres, dust, dirt and

moisture are permanently sealed out,

lubricants sea led in.

l · Solder or qu ick-connect terminals
molded permanent ly into position mini-

mize production damage.
I · Standard index angles inc lude IS ·, I 30 ', 36 °, so · and 90 °, special angles

available on request.

I · Write for engineering bulletin.

I I

~~ STACKPO&E

: I

COMPONENTS COMPANY 1'

I..._ ___ __ _ I ®

P. 0 . Box 14466

....'.'.,a~h~ c~1:_

INFORM A TION RETRIEVAL NUMBER 74
ELECTRONIC DESIGN 11 , May 24 , 1970

Resistor I capacitors
are dual-in-line arrays
-~
I0 '
<7a.-z
(

Pulse transformers handle 500 Vµs

Tiny ceramic FM filter measures but 0.016-in.3

iiiiiiRfff
l ? 11 10 g 8 7 6 5 4
California Microcircuits, Inc. subsidiary of T eller Industries, Inc. Phone: (213) 772-2161.
New arrays containing networks of up to thirteen resistors or capacitors in a single 14-pin dualin-line package are available. Resistors can have any value ranging from 20 n to 1 Mn with a tolerance down to ±0.1 %. Capacitors can have values ranging up to 0.1 µ.F. A 15-resistor array is also available in a 16-pin DIP housing.
CIRCLE NO. 278
UNEXCELLED QUALITY FOR LESS THAN 5C
· Listed by UL AND CSA, I to 10 amps at 125V AC. · 7960 slide switch combinations-23 basic types. · New rugged solder lug terminal, de· signed for use with quick connectors. · Uniform quality assured by automated assembly. · Electro-si Iver plated terminals and contacts-shorting and non-shorting. · Phenolic or nylon triggers in a variety of colors. · Write for engineering literature.
INFORMATION RETRIEVAL NUMBER 75
ELECTRONIC D ES IGN 11 , May 24, 1970

Aries T echnology, 1247 El Camino

R eal, Mountain View, Calif. Phone:

( 415) 964-1606. Price: $3,85 to

$4.10.

Two series of pulse transform-

ers feature a product of pulse

height times pulse width of 300

Vµ.s (type BM ) and up to 500 Vµ.s

(type BN) . They were designed for

SCR trigger circuits and general

instrumentation where relatively

long pulses are required. All units

are available in a variety of turns

,- -- - - - - - - - - - ratios and use self-supporting #24

AWG leads.

CIRCLE NO. 279

1 CERAMIC CAPACITORS :

WITH SUPERIOR

I TEMPERATURE COEFFICIENT

· . I

I
I · Available in range of 0.1 to IO pico·

I'~

farads. · Tolerances of 5%-10%-20%, at rated

working voltage of 500V DC.

· Temperature coefficient is ± 2% for ~ values of 0.1 to 5.1 pf over a tempera-
ture range of -55° C to 85° C.

· Only ± 3% temperature coefficient

I · I~'

for values of 5.1 to 10.0 for temperatures ranging from -55° C to + 85° C.

Power factor less than 1% at 1 mega·

I · ~ cycle at less than 80% RH. Write for bulletin.

~0> II

STM:kPOlE CARBON COMPANY

Electronic Components Division

St. Marys, Pa. 15857

INFORMATION RETRIEVAL NUMBER 76

Gould Inc. Piezo electric Div., 232

For bes Rd., B edford, Ohio. Phone :'

(216) 232-8600. P&A: 50¢ per

100,000; 2 wks.

Combining small size and high

selectivity is the new FM-4 10.7-

MHz ceramic bandpass FM filter. It

is a high-Q piezoelectric ceramic

molded in epoxy measuring only

0.415 by 0.38 by 0.1 in. It is dis-

tortion-free to a stop-band above 45

dB, with a 3-dB bandwidth of 235

kHz and a 40-dB bandwidth of 825

,--------- -- kHz.

CIRCLE NO. 280

J SLIDE-TROL®- NEW CONCEPT
I IN POTENTIOMETER DESIGN

I
I
I I
I I

· Mount horizontally, vertically or sideways, either singly or in multiple units.
· Standard solder lug, wire wrap or printed circuit terminals available.
· Low noise and low contact resistance, plus uniform heat distribution.
· Ratings 40-50011 1.5 watts, 5005Kn 1.25 watts, 5K11 and over 1. watt.
· Thermal expansion-contraction and shock hazard problems eliminated.
· Know resistance setting at a glance.
· Compact, lightweight, functional, attractive.
· Write for SLIDE·TROL ® Brochure.

---------- ....INFORMATION RETRIEVAL NUMBER 77 125

COMPONENTS

SUPPLIES
with guaranteed 3-day shipment
The Acopian promise of 3-day shipment doesn't apply to just part of our line-ar to even 90% of our line. It is your assurance that whenever you order supplies listed in the Acopian catalog, your order wi 11 be on its way to you in 3 days. We guarantee it. Do you have the latest Acopian catalog? It lists AC to DC power modules with both single and dual outputs. Regulated and unregulated. With plug-in, barrier strip or solder lug terminations. 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 7B 126

Passive LC filters are dual-in-lines
ESC Electronics, 534 B ergen Blvd., Palisades Park, N.J. Phone: (201) 947-0400.
Housed in cases measuring 0. 76 by 0.46 by 0.25 in. are several series of passive low-pass LC filters in dual-in-line packages. DIF-L20 units attenuate 20 dB minimum in the stopband beyond cutoff. DIFL39 units attenuate 39 dB minimum in the stopband beyond cutoff. Insertion loss is 0.5 dB and passband ripple is ± 1 dB. Other filter geometries are available.
CIRdE NO. 281
Low-noise active filters reach down to 0.001 Hz
Analog Devices, Inc., 221 5th St., Cambridge, Mass. Phone: (617) 492-6000. P&A: $34 to $99; 2 wks.
The series 700 low-cost low-pass active filters use !Cs and computeraided design to span the frequency range of a low 0.001 Hz to 20 kHz at cutoff with only 50 µ,V of noise. Cutoff-frequency tolerance is 2% and signal amplitude range for a minimum discernible signal to ± 10 V full scale is 104 : 1. The filters incorporate a two-pole Butterworth design.
CIRCLE NO. 282

Malfunction indicator shows faults in color
A. W. Haydon Co., 232 N . Elm St., Wat erbury, Conn. Phone: (203) 756-4481.
A low-cost tiny fault indicator provides an instant visual display of a transient or continuous circuit malfunction by a color transfer of its display mode. This 0.32in. dia device latches into place magnetically until it is reset. Resetting is done by energizing a reset coil. It was designed for pulse operation and does not need continuous power.
CIRCLE NO. 283
Miniature rotary switch has 9/ 16-in. diameter
Daven Div. of Thomas A. Edison Industries, Grenier Fi eld, Manchester, N.H. Phone : (603) 6690940.
With a diameter of only 9/ 16 in., the new series S compact rotary selector switches offer as many as 10 decks with spacings of 18, 22-1 / 2, 36 and 45 degrees. Onepole versions are available for 2 to 20 positions and 4-pole versions for 2 to 5 positions. Shorting and non-shorting types are included.
CIRCLE NO. 284
Shielded blower units suppress emi to 24 GHz
McL ean Engineering Laboratories, P.O. Box 127, Princeton Junction , N.J. Phone : (609 ) 799-0100.
Generating no measurable emi noise, the R2EB300 series of blowers are designed with a theoretical attenuation capability for electric fields and plane waves of 109 dB to a frequency of 24 GHz. Tested against MIL STD 280, a shielded blower-enclosure combination provided attenuation of 71 dB to 10 GHz. Airflows range from 150 to 1000 cubic feet per minute.
CIRCLE NO . 285
ELECTRONIC D ESIGN 11 , Ma y 24, 1970

INSTRUMENTATION
In-circuit IC checker tests all pins at once

Oscilloscope for $300 reaches out to 8 MHz

Calt1'0n Industri es, 2015 S econd St., B erkeley, Calif. Phone: (415) 548-1966. P&A: $229; 4 wks .
Circuit-Vu 100 portable integrated circuit analyzer speeds the trouble-shooting of digital systems by allowing in-circuit checking of all inpu~ and outpu~ of an IC simultaneously. The status of each input and output is displayed through an overlay containing the schematic of the logic element under test. The overlay eliminates checking IC manuals for pin layouts.
CIRCLE NO. 286

RCA / Electronic Components, 415 South Fifth St., Harrison, N.J. Phone: (201) 485-3900. Price: $298.50.
Besides a flat (within ± 1 dB) vertical-amplifier frequency response from de to 5 MHz, the W0505A solid-state $298.50 oscilloscope is usable out to 8 MHz. This high-performance instrument also offers a gain of 15 mV pk-pk per inch on the high-sensitivity range of the vertical amplifier. Another feature is return-trace blanking circuits.
CIRCLE NO. 288

True rms voltmeter reads 1000 times/s

Oneofthe -unique qualities

of Electro Cube

·······
Spectrum Dynamics, P.O. Box 23699, Fort Lauderdale, Fla. Phone: (305) 566-4467. P&A: $295; stock to 2 wks.
Carrying a price tag of only $295, a new integrated circuit tester is a compact manually programmed instrument designed for de and functional testing of most digital ICs. Model 101 has a 4 by 16 program matrix that permits selection of supply voltage, logic level 1, ground, or no connection at each pin. It has a pushbutton pulser.
CIRCLE NO. 287
ELECTRONIC DESIGN 11, May 24, 1970

H ewlett-Packard, 1501 Pag e Mill Rd., Palo Alto, Calif. Phone: ( 415) 326-7000. P&A: from $800 or $900; stock.
Model 3480A/B general-purpose digital voltmeter is a four-digit instrument that can make up to 1000 readings per second for de voltage or resistance. The unit also offers a true rms ac converter plug-in measuring down to 100 mV full-scale with response from 1 Hz to 1 MHz. The 3480A is a halfrack DVM, while the 3480B is a full-rack one.
CIRCLE NO. 289
INFORMATI ON RETRIEVAL NUMBER 79 ...

is to produce
non-standard
packages readily
electro cube fJ capacitors
We also make 4,000 or more standard capacitors with wound dielectrics . If case style is a problem, ask. We'll help. Electro Cube, Inc., 1710 South Del Mar Road, San Gabriel, California 91776. (213) 283-0511

Face up to the flat one!
The inherent advantages of Zenith Flat-Face CRTs assure the brightest. clearest display of alphanumeric and analog data . Parallax errors are minimized . Provides resolution as high as 2500 TV lines . Design variations include single and dual neck configurations. Optional rear projection ports and laminated implosion shields. For details, write or call (312) 674-8000.

THESE
..

. N.. .E.W

LUM-PED

.; : .·
""'-

. . .

::
- -""

E ·K11neeiP<1

c C

x"i 1pcn ·11t .i1p,111v

- CONS~=T--A·-N--T

DELAY LINES
:·-.:

E 1Kl llf'Plf 'd C o1"i 1po 10 1h

C cx11; 111y

ARE A- V-A-·IL. .ABLE 1' ::: ...
E 1ll11ric't'1t·11 C uh 1po ~ ' 11
C (Xllpdll\'

FROM

5 TO 25NS IN ONE-

HALF
~

N.....A.. N. OSECO-""-' ND

E 1K111lt~1t·,I

C cx"i11xx1e11t

c , )1111)(111y

INCREMENTS!

If you 've been looking for lumped constant delay lines in the 5-25NS delay range...with fixed delays at half nanosecond increments, look to ECC's Series 25 Delay Lines. Avail-
able in .11 fixed delay versions from
5-25NS, these lines are epoxy encapsulated in Diallyl Phthalate cases ranging in size from .500W x 1.300L x .375D to 1.200W x 1.300L x .375D. All cases feature stand-off feet for PC board mounting. Rise times for this series is from 1NS to 2.25NS. Impedance is 75 ohms and attenuation is .1 db max . This series meets applicable portions of Ml LD-23859A and MIL-STD -202C. All units are available from stock to 3 weeks ARO . Contact the factory for complete details.
ecc
ENGINEERED COMPONENTS CO. 2134 West Rosecrans Avenue Gardena, California 90249 Ph. (213) 321-6565,321-8294

INFORMATION RETRIEVAL NUMBER 81 128

INSTRUM ENTAT ION

Digital panel meter measures 17 ranges

· '~ff~~~~~~~-:::-~ ,
.=.. ~-t~~~~~::~:~~~~,.,~

DIXSON

VI JOO

Dixson Instruments, P.O . Box 1449, Grand Junction, Colo. Phone: (303) 242-8863. P&A: $199; stock.
A new 3-1/2-digit panel meter can measure 17 ranges of de and ac voltage, and de and ac current by simply switching its interchangeable plug-in cards. Model VT300 features a built-in power supp ly, automatic zero, overrange indicator, internal calibration reference voltage, BCD output, and an external trigger input. Accu-
racy is ± 0.1 % of reading, ± 0. 1 %
of full scale.
CIRCLE NO . 290
Pu Iser for $390 reps out to 10 MHz

Data Dynamics Div., 240 H umphrey St., Englewood, N.J. Phone: (201) 567-5300. P&A: $390; stock.
Costing only $390, a new pu lse generator, model 5109, can deliver repetition rates from 10 Hz to 10 MHz. It has three separate outputs, which are always active and are simultaneously available. The three outputs are: positive pulse, negative pulse, and an IC-compatible output specifically des igned for TTL, RTL and DTL circuits. Pulse width is adjustable.
CIRCLE NO. 291
ELECTRONIC DESIGN 11 , May 24, 1970

TOOLS & ENGINEERING AIDS
Low-cost lead bender retails for $14.95

Universal work station
· adjusts several ways

Ii
By-Buk Co., 4326 W. Pico Blvd., Los Angeles, Calif. Phone: (213) 937-3511. Price: $14.95.
A new lightweight componentlead bending block with gauge plate for use in prototyping, testing and product assembly costs only $14.95. Model 700 is a precision-made banding block which gives neat rounded bends to leads on resistors, diodes, capacitors, transistors and inductors, doing away with nicks, rings and plier damage normally encountered.
CIRCLE NO. 292

Siks Manufacturing, Inc., 143 233 St., Bronx, N.Y. Phone : 892-8566.
Adjustable to accept a wide variety of printed circuit boards, terminal boards, connectors and assemblies is the Uni-Stat work station which can be positioned to allow different types of electronic and mechanical assembly operations. It is adjustable to combinations of height and width within its holding dimensions of 0 to 5in. wide and 0 to 2-in. high.
CIRCLE NO. 294

Technical pen set streamlines design

Fiber-optic source beams 800 foot-candles

i. S. Staedtler, Inc., Box 68, Mont-
ville, N.J. Phone: ( 201) 335-1800. The Mars-700 S9 is a new tech-
nical pen set whose compact design makes it ideal for both desk and board use. The set's case functions as a work stand and is designed to close in such a way that it is easy to store and convenient to carry. Keyholes are provided to hold the cap of each pen in a vertical position so the user can change line width easily.
CIRCL E NO. 293
ELECTRONIC DESIGN 11 , May 24, 1970

Bausch & Lomb, 635 St. Paul St ., Rochester, N.Y. Phone: (716) 232-6000. P&A: $300; stock.
A new fiber-optics illuminator provides a cool 800-foot-candles spot of light within a 7-in. dia circle up to 6 in. from the end of its probe. The probe is a 1/ 2-in.dia fiber-optics bundle and is available in two or three-foot lengths. It is flexible to allow its bending and will retain almost any shape to direct the illumination.
CIRCLE NO. 29 5
INFORMATION RETRIEVAL NUMBER 82 ...

who's first with a Z-combo cassette head for dictating and telephone answering?
.OJO# proximity of erase and r/ p gaps allows precision editing. R/ P inductance
200 mhy, 3"0 ohms
D.C.R., 9.7 RMS
voltage at 1 khz.

PACKAGING MATERIALS

High-density PC board reduces circuit size

Wood-metal cabinets enhance enclosures

Circa-Tran, Inc., P.O. Box 832, Wh eaton, Ill. Phone: (312) 8583727.
A new PC board that reduces circuit s ize features copper conductors that are electroplated rather than etched to the phenolic substrate in thicknesses from 0.1 to 1 mil. Circa-Board's design allows mechanized assembly of all components to the same side as the copper conductors. Mechanized assembly via programmed feeders is made possible by distinctively shaped components.
CIRCLE NO. 296

... 1
Javelin Precision, Inc., 116 Toledo St., Farmingdale, N.Y. Phone: (516) 293-6443. Availability: stock.
Slope-front desk panel cabinets, known as the Executive series, provide a unique combination of wood and aluminum. The enclosure's wood panels arc constrn cted of hand-worked solid walnut, deep grained with an attractive lu ster finish. Metal panels are fabricated of 16-gauge anodized aluminum with a clean natural finish. All cabinets are equipped with rnbber feet.
CIR CLE NO . 298

Custom-woven cable fits any application

One-system liquid
bonds in 60 secon-d-s --

Nortronics is who!
· Extended tip version for card reader, drum and belt applications
· Dual channel units available · Applicable as m ini-d igita l tunnel -
write head; request d ig ita l specs
NORTRONICS COMPANY, INC.
8101 Tenth Aven ue North Mi nneapol is, Minnesota 55427 (612) 545-0401
INFORMATION RETRIEVAL NUMBER 8 3
130

Th e Zipp ertubing Co., 13000 S. Broadway, Los Angeles, Calif. Phone : (2 13) 321-3901.
In instan ce,; when only a certain type of connector will do for a given application, but the cable or harness presents a problem, FRC Fab-Ri-Cable may be the ultimate solution. A low profile allows it to fit into extremely limited spaces, and to fold once or several times. It will bend, spiral, or accordion fold without affecting the performance of the conductors.
CIRCLE NO. 297

l oz
CONTllrT r.FMENl
T escom Cm·p., In strument Div ., 2633 S. E. Fourth St., Minneapolis, Minn.
Called Zipbond, a new onesystem bonding liquid .ioms most materials to themselves and to each other in just 60 seconds . Because no heat or pressure treatment is needed, it is ideall y suited for jobs requiring fast curing time. Its tensile shear strength is 2770 psi. All types of mate rials can be bonded including rubber , metals. plastics, wood and glass.
CIRCLE NO . 299
ELECTRONIC D ES IGN 11. May 24. 1970

MICROWAVES & LASERS
Amplifiers for C band lower cost to $850

Pnp power transistors take 40 Wat 175 MHz

Varian Solid State Div., B everly, Mass. Phone: (617) 922-6000. P&A: $850; 60 days.
Covering the frequency band of 3.95 to 8.2 GHz, the model VSC9650K (3.95 to 5.85 GHz) and VSJ-9650K (5.85 to 8.2 GHz) impatt amplifiers deliver outputs of 100 mW at $850 per unit including the circulator. Both have two versions : one with a 50-MHz bandwidth and 13-dB gain and one with a 500-MHz bandwidth and 13-dB gain.
CIRCLE NO . 335

Motorola Semiconductor Products Inc., Box 20924, Phoenix, Ariz. Phone: (602) 273-3466. P&A: $6.20, $15, $23, $38; stock.
Four new additions to a line of pnp rf silicon power transistors are types MM4020, MM4021, MM4022 and MM4023. They feature output powers and gains at 175 MHz of 3.5 W at 11.5 dB, 15 W at 7 dB, 25 W at 5.5 dB and 40 W at 4.5 dB, respectively. Each transistor features balanced-emitter construction.
CIRCLE NO . 337

Low-noise transistors operate to 2000 MHz

GaAs laser diode line spans 8 to 200-W range

A vantek, Inc. , 2981 Cooper Rd., Santa Clara, Calif. Phone: (408) 739-6170. P&A: $13, $25; stock.
Two families of silicon npn transistors are the AT-25, 25A and 25B, in T0-72 packages, and the AT-50, 50A, 51, 52 and 55, in stripline packages. The AT-25 series works to 1000 MHz, with a noise figure of 1.5 dB and 14-dB unneutralized gain at 500 MHz (AT-25B ). The AT-50 series works to 2000 l\IHz with a noise figure of 2.5 dB and 14-dB unneutralized gain at 1 GHz (AT-50A) .
CIRCLE NO. 336
ELECTRON IC D ES IGN 11 , May 24, 1970

Sperry Gyroscope Electro-Optics Group, Great Neck, N.Y. Phone: (516) 574-2715.
Featuring low threshold currents and low costs at peak power densities is a line of new GaAs laser diodes ranging from 8-W units to 200-W arrays. Single diodes in the 8 to 23-W range are stud mounted. Higher-power units include a 40-W dual diode and 100 to 200-W radial arrays. Units in 500 and 1000-W densities will be available in the future.
CIRCLE NO . 338
INFORMATION RETRIEVAL NUMBER 84 ~

DATA PROCES SI NG

Low-cost calculator uses mosaic lamps
Spiras Systems, Inc., 332 Second Ave., Walt/mm, Mass. P1·ice: $7000 to $8000.
Introd uced as a specialized version of the Irascope CRT data base display termina l, the model DBEC 1000 U/L system features 72 IBl\Ifo nt upper and lower-case characters. This new terminal provides local and/or remote editing capabi li ties. It also claims fli cker-free characters in a 2000-character fi eld a nd a bonded safety faceplate etcherl for minimum glare.
CIRCLE NO. 340
CRT computer displays show black-on-white
Wy lP Laboratories, Computer Product.s Div ., 128 Maryland St ., El Segundo, Calif. Phonl': (213) 3221763.
Labeled as Computerminal, a new data display terminal offers a display capacity of up to 1024 characters . Model 800 can han dle transmi ssion speeds as fast as 2400 bits per second. It provides control disciplines that are equi valent to IBM models 2260 and 2265. Special keyboard confi gurations permit its use in a variety of appli cations .
CIRCLE NO. 342
132

Dictaphone C01'P., B usiness Machine.<; Div., 120 Old Post Rd., Rye, .V .Y. PricP: $695.
A 14-digit calculator, which sells for $695, uses a mosaic-lamp display to elimin ate depth perception prob lems and glimmerin g effects, and to minimize operator eye fatigue and transposition e rrors. A principal feature of model 1401 is its zero suppression system, which displays only the actual numbers put into the calculator and the results.
CIRCLE NO. 339
CRT terminal stylizes font
Applied Digital Dnta Systems, Inc., 89 Marcus Blvd., Hauppcluge, N.Y. Phone: (516) 273-7799. P&A: $2995 to $8995; 90 to 120 days.
Unlike most co mputer terminals, the Consu l seri es of CRT displays s how black characters on a white display page ce nter ed on the sc reen to ease eyestra in. The page fo rmat provides margins that enable the user to anticipate the end of a line or the last of a sequence of text. The units arc compatible with teletypewriters.
CIRCLE NO . 341
Data display terminal shows 1024 characters

Low-cost minicomputer simplifies programming
Atrnn Corp., Tmpp Rd ., St. Paul, Minn . PhonP: (612) 454-6150 . Price : fl'Om $6000.
Th e Datamanager 501 is a new low-cost mini computer that is said to significant !~' red uce programming time. Its processor is spec ifica lly designed to handle data in strin gs as well as single characters. The basic machin e, whi ch costs $6000 in quantity, includes four hi gh-speed buffered I / 0 channels with fu ll bu ffcr acid ress co ntrol and two direct memory access ports.
CIRCLE NO . 343
Solid-state keyboards cost just $100 each
Contrnl Devices, Inc ., 204 Neu· B oston St., Woburn, Mass. Phone: (617) 985-1105. P&A: $100; 80 days.
Low-profile solid-state keyboards are sa id to use a uniqu e switching technique that allows these fu ll~· encoded units to sell for less than $100 in production quantities ( 1000 units or more). Series CDK ke~· boards offer two basic formats : one for typical typewri ter applications and one for keypunch-type applications. The basic configuration has up to seven rows of k e ~1 s.
CIRCLE NO. 344
INFORMATION RETRIEVAL NUMBER 246 ...

· The best power supply to tuck into impossible spaces is the one specificall designed to tuck into impossi le spaces.
We make it. We call it our Impossible Space
Power Supply.
(also known as the JR series)

. ...,......,..,,.... ................. ....... .... ...... .............. ..... . ..;::,t,,:~:..::.,!, ·r:;;~.~_ H;;T~~~t~~7~,,i,7H;~n,t~H~

t · l # · l l · tit f 1111 1·,t#lll#.ll11111111 #111111#1-1#111111
f # t · · · " f. t· o·.t·· f.t ,.,_..., t t · If 111111111 f l f"#llll f l t t · # I

))···I I I t·.t I 11.tJ #11 fl.I I It IJI. I l.t It I If

11·11tIIf111

f 4 ·'I ·4

f Io It I I t"t

········································11·-······ ..······························ 11

·· · ······· ···· 111 ················ ·t1·111a ··111· ············ ···· ·············· ·····

::::::.':.·:.·.·::.·:.·::::::::::::::::::;::::::::::::::::::::::::::::::; :: : : : ,',','

; ;;;;

'!' fl ~-·~ t .· t · ·· !'! ·: f?:S.t !!.fJ !..?· ·!·· !.!:! ·,: ·:.·!!!!-':U.· !l-.! ··:t.t ··~ ~::-: · ! ·J~!! ·· ·· ! ·.e ·-:·.!

------ -

Weighing in at a mere 1.5 pounds and measuring only 1%" x 3Y8 " x 6.5", ACDC's new JR offers more watts per unit volume than any other miniature power supply on the market. It's so small that you can put five of them in the same space normally occupied by one of "theirs" . . . so efficient (80%) that it requires no internal heat sinks .. . and so noise-free that you can use it anywhere.
Three JR models are available in continuously adjustable

output voltage ranges from 3.0 to 30 volts (0.1 % regulation)
and in current ratings from 2.0 to 10 amps. And most impor· tant, it operates from conventional 60 or 400 cycle input.
Of course, the JR costs a little more than conventional power supplies ($285 in small quantity), but if space and efficiency is your problem, the JR is your only answer.
Get one tomorrow ... or five ... or ten .. . or a hundred. They' re on the shelf.

acdc electronics inc.
Oceanside Industrial Center, Oceanside, California 92054, (714) 757·1880

JR Miniaturized Power Supply Module / Specifications

.... .2l
~
u
ca
.·..~..
Ill ::I 'tl
c:
Q)
'tl
"iii c:
m
<J
0
·cu-.·.
uen
·-c
0
..u
Q)
-Q)

Nominal Output
Output Voltage Voltage Range= (VDC) (VDC)

Maximum Current Rating (Amps)

3.0

5.0

5.5

6.0

Maximum Dimensions
(inches)

1.375 3.125 6.5

4.0

3.0

1.375 3.125 6.5

2.5

2.0

· continuously adjustable

1.375 3.125 6.5

Weight approx. (lbs.)
1.5
1.5
1.5

Model

(Add -1 for

Case

Overvoltage

Size

Protection)

JR5KIO

JR15K4 .0

JR25K2.0

Quantity

Price (add $30 for OVP)

1-9 10-24 25.49 50-99
1-9 10-24 25 -49 50-99
1-9 10-24 25-49 50-99

$298 291 285 280
$298 291 285 280
$298 291 285 280

Input Output
Regulation
Ripple
Stability Transient Response Remote Sensing
Remote Voltage Adjustment Ambient Temperature Weight Mounting
Dimensions

105-125VAC, 47 -420Hz, single phase.
Voltage range shown in table is continuously variable between limits by externally accessible scre.wdriver adjustment of multiturn pot. Output is floating - either positive or negative terminal may be grounded . Current: zero to full load as shown in tables.
0.1% + 5mV NL-FL ± 0.lo/o ± 5mV for ± 10% input variation .
3mV RMS max (120Hz) . 25mV P-P (spikes at 50KHz rep. rate).
Typical lOmV for eight hour period after initial warm up.
Typically less than 1 msec in response to an NL-FL step.
Terminals are provided to maintain regulation at the load, compensating for the DC voltage drop in the load cable.
Terminals are provided to adjust the output voltage by means of a remote variable resistor.
Unit must be mounted to allow conductive heatsinking to hold the case temperature below 80 °C.
Approx. l '/2 lbs.
Mounting surface 3V8 x 6'/z has threaded mtg.
holes.
1%x3 1/s x 61/2.

Overload Protection
Overvoltage Protection (Optional)
Connector Construction
Temperature Coefficient

Models are inherently protected against overload and short circuits of any duration. Automatic recovery is electronically accomplished.
A complete independent overvoltage protection module is available and straddles the output terminals. This protection does not depend on the regulating circuitry of the supply. Trip voltage adjustable from 5-30 volts.
Barrier strip termination .
Black anodized aluminum case. Unit may be removed from case for complete serviceability.
0.02o/o/ °C max.

100
~ "
u 80

~
a::

'l;

u"" 40

8: 20

TEMPERATURE GRAPH FOR JR SERIES POWER SUPPLIES .

Temperature in Degrees Centigrade
A. Ambient temperature . Unit unmounted . Base plate vertical. B. Ambient temperature. Unit attached to HS-I Heatsink . Fins vertical. C. Base plate temperature of supply.

I -0-
1

832TH"O 8PL.ACCS

MOUNTING SURrACE 650

f 137
'--'--1-+-~~~~~~--' _l

Full-feature display has $2995 price tag
Hazeltine Corp., Industrial Products Div., Little Neck, N.Y. Phone: ( 212) 321-2300. P&A: $2995 or $88 / month; stock.
The model 1760 terminal is a compact stand-alone desktop display that includes a keyboard input and a CRT monitor for on ly $2995, not $500 as previously reported (ED 9, April 26, 1970, page C41, circle no. 265 ). This new display terminal can present 1760 characters on 32 lines of 55 characters each, or 1998 characters on 27 lines of 74 characters each. In addition, the 1760 offers split-screen capabilities and full editing features.
Characters have a 5 by 7 dot matrix structure, and character
generation is by means of ONI
OFF control of a standard 525-line TV raster. Nomin al transmission rate for the new terminal is 110 baud, adjustable to 2400 baud or to below 110 baud. The unit comes with 9 or 12-in. monitors.
CIRCLE NO. 345

Electronic calculators trim operator time
!ME Sales Corp ., One !ME Plaza, North B erg en, N .J.
Designed for general business use, series 120 electronic calculators feature a simplified keyboard to reduce the number of key depressions, thereby increasing operator efficiency by as much as onethird. Visual recall of both the factors and the total of the previous calculation, automatic rounding, and self-clearing are other advantages. The units are supplied with fo ur, five or six memories.
CIRCLE NO. 346
ELECTRONIC D ESIGN l l , May 24, 1970

Who says diallY.I ohthal1te is for small parts? Not GE!

GE specified a diallyl phthalate is extremely strong. Used in large,

compound for this 8 1/4 -pound mold- high voltage power transformers, it

ing because of its remarkable insu- proves that diallyl phthalate has

lating properties. It is one of the more than just application in small,

largest moldings ever made of the precision-molded parts.

material.

If you need molded parts that

FMC's diallyl phthalate ':' resin stay on the job, remember a com-

has negligible lifetime shrinkage, pound based on FMC's diallyl

doesn't lose its electrical insulating phthalate resin can solve a wider

properties , and isn't degraded by range of tough-and big-prob-

moisture or aging.

lems. Organic Chemicals Division,

In fact, among thermosetting FMC Corporation , 633 Third Ave.,

plastics , it is unsurpassed in

N.Y., N.Y. 10017.

the ability to retain its electrical characteristics at high temperature and humidity levels .
This big insulating header, molded with an Acme Res in glass-fiber-filled compound,

fmc
· · · · ·,

*F MC supplies basic diallyl phthalate and diallyl isophthalate resins under the tradename DAPON. Write for complete information and a list of companies supplying molding
compounds and prepregs ® based on these resins.

FMC Chemicals
INFORMATION RETRIEVAL NUMBER 85
133

Evaluation samn1es

Dry transfer lettering

Rrron 000000000000 :.L . T Cylindrical Style Interference Filters
that reduce or eliminate unwanted noise or signals. Small size, light weight, maximum attenuation. Voltage current or insertion Joss characteristics required, determine physical size. Maximum isolation of terminals and high frequency performance are assured by threaded neck design for bulkhead mounting. Feed-thru capacitor circuitry conserva-
------------- tively rated for both military and com-
mercial applications.
Rl"PDfl corporation
P.O. Box 743 Skokie, Illinois 60076 Phone 312 · 327-4020
D Send catalog and prices. O Have Representative call.
D Specifications enclosed on Multi-
circuit or custom design filters. Send estimate. Name_ _ _ _ _ _ _ _ __ _ _~
Firm
City_ _ _ _ _ _ _ _ _ _ __
State _ _ _ _ _ _ _ _ _Zip_ __
INFORMATION RETRI EVAL NUMBER 86
134

Free samples of an extensive line of dry transfer letters and symbols are available. The line consists of four type styles ( #1200, #9700, # 1400, and # 5700) in a variety of sizes. Styles include Jason, Computype, Parady and Futura Light in lower-case and capital letters and numerals. Tactype Inc.
CIRCLE NO . 347
PC board etchant
Phodar is a new photopolymer dry-applied resist that reduces PC board etching to a simplified fiveminute process. Preparation time is cut because no special cleaning solutions are required and meticulous care to assure perfect adhesion between fi lm and plate is unnecessary. There is no waiting time between lamination and exposure and Phodar completely eliminates the post-baking cycle after development. Full details and a free test pack are available to qualified readers. Photopolymer Research Corp.
CIRC LE NO . 3 4 8

Temperature monitor
A free evaluation sample is available of a self-adhesive miniature 5/ 16-in. square temperature recorder. The model 200 is a pastel temperature monitor that indicates the temperature attained over the range of 100 to 1100°F by turning black permanently when its rated temperature is reached. l\Iodels are available with one to eight different calibrated temperature ratings. The rated temperature is printed below each indicator window. William Wahl Corp.
CIRC LE NO . 349
Drawing board cover
Vyco is a new cover that rejuvenates drawing board surfaces for better protection and longer life. It's vinyl three-ply laminated construction assures crack-free surfaces and consistent line drawing reproductions at high quality. It has two useable surfaces: green and ivory. Compass point holes and hard pencil impressions will not mar its two surfaces. Sample pieces are a\'ailable for examination. Alvin & Co., Inc.
CIRCLE NO. 3 50
ELECTRONIC DESIGN 11. May 24. 1970

Design Aids
Resistor curves
A series of three curves and a table of compar ison are avai lable to assist engineers in calculating resistor power ratings. The curves are used to approximate how much heat a given resistor will generate under a given condition. One is a derating curve for resistor ambient temperature, another curve shows the resistor's temperature rise vs its power dissipation and the third curve gives the percentage of the resistor 's power rating vs its temperature rise. The table gives the amount of heat the resistor will generate under a given circuit and ambient conditions. Ward Leonard E lectric Co.
CIRCLE NO. 351
Color selector
A new contemporary color selector for a standard line of metal enclosures for electronic instruments and systems is avai lable. It shows color swatches that are se lected to afford t he enclosure designer a wide opportunity to create attractive color schemes by coordi nating, contrasting or harmonizing the standard colors shown. P remier Metal Products Co.
CIRCLE NO . 352
Frequency chart
A frequency-conversion chart that covers the frequency range of 1 Hz to 10 GHz and directly indicates frequency stabilities of oscillators is available. It give frequency stabilities in parts-permillion and in per-cent figures. It is designed as a time saver for those engineering groups and manufactu rcrs who are con ti nu ally work ing with frequency-contro l devices. Accutronics/ Div. of Gibbs l\Ianufacturing and Research Corp.
CIRCLE NO . 353
ELECTRO IC DESIGN 11, May 24, 1970

0 DBM IU!,: t mwjtOOA

·ZEllO

· ~

SOLID

V 0 LT - OHM - MI LLIAM Ml!Tl!R

Simpson's NEW solid-state VOM with FET-lnput
· HIGH INPUT IMPEDANCE ... 11 Meg Q DC 10 Meg Q AC
· PORTABLE . .... battery operated · 7-INCH METER . .... overload protected
Simpson's new 313 gives you high input impedance for accurate testing of latest circuit designs ... free of line cord connect ions. Over 300 hours operation on inexpensive batt eries. And the new 313 is stable, which means positive, simplified zero and ohms adjustments. Protected FET-input handles large overloads. DC current ranges to 1000 mA. Sensitive Taut Band movement and 7-inch meter scale provide superior resolution down to 5 millivolts. Write today for complete specifications.
Complete with batteries, 3-way AC-DC-Ohms probe, and operator's manual .. . ...... . ... . . .. .. . .. .... .. $125.00
GET "OFF-THE·SHELF" DELIVERY FROM YOUR LOCAL ELECTRONIC DISTRIBUTOR

ELECTRIC COMPANY

DIVI SION

5200 W. Kinzie Street, Chicago, Illinois 60644 · Phone (312) 379-1121
EXPORT DEPT.: 400 W. Madison Street, Chicago, Illinois 60606. Cable Simelco IN CANADA : Bach-Simpson Ltd., London, Ontario · IN INDIA : Ruttonsha -Simpson Private Ltd., International House, Bombay-Agra Road, Vikhroli, Bombay
IN FORMATION RETRIEVAL NUMBER 87
135

ALL NEW 3230 SERIES SOLID STATE
POWER AMPLIFIER LINEAR OUTPUT TO 4 WATTS

C-COR MODEL 3231 Bandpass Power Amplifier With frequency range from 90 to 500 MHz a_nd bandwidth to 60 MHz, the MODEL 3230 series
amplifiers provide excellent transient response, smooth flat bandpass frequency
response and wide dynamic range. The new C-COR 3230 Series will find use where several
watts of power are required for pulse, FM, AM,
or CW signal amplification.

Specifications

Model 3230 Series

Frequency Range MHz

90 to 500

3 dB Bandwidth [M inj

30 to 60

1 dB Bandwidth [Typ 803 of 3 dB Bandwidth

Gain

20 to 35dB

Power Output

[Min] [dBm] at

1 dB compression

+30 to +36

Package size : 2" H x 3" D x 7" L

(o ver 325 MHz Units 9" L)

Input/ Output Impedance ohms and power required

for is

+a2l8l

mod els is . 50 Vdc. Operating

temperature -40 to +60°C (Air Temperature)

Model 3230 Series are standard catalog units

aligned to customer's exact bandpass. Hence

they provide a fast, economical answer to a

large variety of linear amplifier needs. More

difficult requirements can often be met by

paralleling or otherwise modifying standard

units.

Write or telephone for catalog and technical data on your amplification requirements .. . or check C-COR listing in EEM .

"C-COR Amplifiers . .. Rated first Where Performance is Rated first."
-®rut
C-COR
ELECTRONICS, INC. 60 Decibel Road
State College, Pennsylvania 16801 814 238-2461
INFORMATION RETRIEVAL NUMBER 88
136

APPllCBllOD
Notes
Logic handbook
The sixth edition of the 1970 Logic Handbook contains 448 pages covering solid-state logic, application notes and descriptions and prices of more than 200 standard logic and accessory items. It describes M-series TTL interface and design circuits, K-series industrial control logic, analog/ digital converters, power suppli es, mounting hardware, cabinetry, and wirewrapping services. It also describes earlier R, B and W-series logic modules. Digital Equipment Corp.
CIRCLE NO. 354
Wave analyzer
A number of typical wave analyzer applications are illm;traterl in a new 20-page booklet. It shows instrument connections on a page that is opposite an X-Y graphical recording of the result. Applications include measuring harmonic ampli tudes, determin in g distortion, comparing filter characteristics and audio frequency-response recording. Hewlett Packard Co.
CIRCLE NO. 355
Ultrasonic delay lines
An illustrated two-color brochure describing new digital delay lines and their applications is available. It covers the basic definitions and measurements of delay, attenuation and spurious signal levels. Characteristic operating curves and tabulated performance data for representative designs are included. Microsonics Division of Sangamo Electric Co.
CIRCLE NO . 356

Analog multipliers
Application notes on hi gh-speed analog multipliers are available in a new booklet. It presents a series of block diagrams with simplified technical descriptions of many useful multiplier applications as a systems component. Included are applications in the field of computation, signal conditioning, highspeed switching and modulation/ demodulation. Useful background information on types of multipliers and typical sources of error is also presented. GPS Corp.
CIRCLE NO. 357
Data retrieval
"Modulated Time Codes Find Data in Analog Recording Systems" is ari illustrated handbook on the theory of time code indexing and automatic data retrieval. It discusses the theory of operation, bandwidth r ecording on magnetic tape, time error accumulation and synchronization a cc u racy, weighted digit code recognition and reader-automatic search. CGS Scientific Corp ., Datametrics Div.
CIRCLE NO. 358
Signal processing
A new method of signal processing called differential pulse width modulation is discussed in a sixpage brochure. The method permits transducers to produce a high-level output signal to overcome the problems of noise and ground loops or power-frequency pickup. The brochure includes basic principles of operation with illustrations. Setra Systems, Inc.
CIRCLE NO. 359
ELECTRONIC D ESIGN 11 , May 24, 1970

lmpatt diodes
A new method fo r measuring t he t hermal impedance of impatt diodes is discussed in a new application engineer ing bu lletin. The new method achi eves meas urement resu lts by the use of the reversebias characteristics of the diode's current-voltage curve. Thermal impedance values obtained by t hi s method have been fo und to be more r eli able a nd mor e mea ningfu l than values obtained from forward-bias char acteristics. Varian, Solid State Div.
CIRCLE NO. 360
Ladder networks
A new 14-page application engineering b ulletin surveys the d/ a and a/ d requirements for networks and describes design principles for ladders. Schematic diagrams show basic converter circuits as well as formu las for calculating transfer functions and binary relationships. Circuit diagrams are also used to describe weighted, current-fed, and voltage switch ing ladders . Advantages and limitations of various networks for use in a/ d and d/ a converters are also presented. Vishay Resistor Products, Division of Vishay I ntertechn ology, Inc.
CIRCLE NO. 361

You can
reduce costs
by
Improving
Reliability

..~
~'

.·

AEROTRONIC ASSOCIATES CAN HELP YOU KEEP THE COMPETITIVE EDGE with Burn-In and Life-Test Systems custom designed to your own specifications. If
you are a large user of semiconductor or IC devices, preconditioning can significantly
reduce sub-assembly or system failures. Eliminate costly rework by
preconditioning semiconductor and IC components.
Reduce SUB ·ASSEMBL Y FAILURES as much as 80 percent Reduce SYSTEM failures by 40 to 50 percent
Circle our information retrieval number for a copy of, " A Logical Approach to Testing ICs."

Contact AEROTRONIC ASSOCIATES

CONTOOCOOK. NEW HAMPSHIRE 03229

TELEPHONE (603) 746 - 3141

INFORMATION RETRIEVAL NUMBER 89

Neon glow lamp design
An ill ustrated tech nical discussion on the design of neon glow lamps, t heir operational characteristics and applications is available in a 12-page broch ure. It starts with a discussion of what a neon lamp is. how it works and why, and what the operational characteristics of the device are. Included are two and t hree-element lamps showing how light is generated and what the spectral distr ibution of the light is. Ignition characteristics and methods are discussed with man.v curves and charts showing how the lamps act under different co nditions. Signalite Inc.
CIRCLE NO . 362
ELECTRON IC DESIGN 11, May 24, 1970

From schematic drawings to card cage systemsIN ONE ST~P!
·NO ETCHING · NO DRILLING ·NO ART WORK

SEND FOR YOUR
FREE CATALOG AND SAMPL~S.

All types of circuit-element configurations may be mixed and combined on the same b9ard.

drc· nI t-stl.k0
151 8 W. 132nd STRE ET, GARDENA, CALI FORNI A 90249

· Pate nt Pen ding

INFORMATION RETRIEVAL NUMBER 90
137

New Literature

\.. ~

··''

· A Texas ln~trumenls Applic11tion Report

·
Switches
l\Iiniature electronic witches, terminations, indicator lights, and a multitude of termination hardware are listed in a new comprehensive 88-page catalog. Switches contained include pushbutton, rotary" lighted and printed circuit t,vpes. Termination hardware inc:ludes binding posts, test jacks and clips, insu lators, coil forms, washers, and transistor, lamp and tube sockets. Specifications, outlined dimensions and illustrations are shown. Grayhi ll Inc.
CIRCLE NO . 363

MOS !Cs
Two new application reports discuss the use of MOS integrated circuits. One 16-page booklet discusses how MOS shift registers can be combined with TTL ICs to form economical data memories. The three main parts of a circulating memory are discussed in detail. Block diagrams are included to illustrate each of the circulating memory parts. The other report describes MOS read-only memory character generators and how they can be used adrnntageously in display systems. Covered are fundamenta ls of character generators and detailed applications. Texas Instruments Inc.
CIRCLE NO. 365

Metric tools
A broad line of foreign metric and domestic industrial tools are described in a new illustrated catalog. Tools shown include taps, dies, reamers, wrenches, precision and special instruments and other accessories in metric and nonmetric sizes. The catalog is carefully compiled and designed for convenience, ready reference and reading ease. It includes tables of conversions and charts that are useful for practical shop work. Veteran Tool & Supply Co.
CIRCLE NO. 367

Indicator lights
Catalog MIL-70 is a quick and handy cross-reference to military numbers of indicator lights, base and cap assemblies. It also covers military products that are qualified and tested to meet requirements of l\IIL-L-3661B. The twofold. three-ring-punched catalog detai ls indicator-light specificatiuno: and illustrates many military :;tyles. i\Iarco-Oak, a division of Electro/ Netics Corp.
CIRCLE NO . 364
138

Modules and matrices
Programming modules and matrix boards and accessories are detai led in a four-page two-color condensed catalog. It describes the role of the matrix board as a fundamental programming method for thousands of different instruments and systems. l\Iatrix boards listed are shown with ho le patterns and spacing dimen ions. Various ways are shown in which appropriate nomenclature, symbols and programming stripes can be added . Interswitch.
CIRCLE NO. 366

Shelf power supplies
A complete line of shelf power supply packages is described and shown in a new 12-page two-color catalog. Supplies shown include six different-sized packages with seven voltage levels ranging from 3.6 to 28 V de at current ratings from 0.35 to 85 A. General specifications, dimensional data, options, accessories and prices are given. North E lectric Co., Electronics Div.
CIRCLE NO . 368
ELECTRONIC DESIGN 11, May 24. 1970

Connectors
A full line of solderless terminations and unique attaching tools are described in a four-color 28page catalog. Illustrated are insulated and non-insulated terminals to meet every requirement. Also included are special-type terminals for hi gh-tem perature applications up to 650 ° F. Vaco Products Co.
CIRCLE NO . 369
Instruments
Various laboratory and measurement instruments are described in a new 32-page illustrated catalog. It contains informati on on voltage, current and power measurin g equipment. It also includes laboratory standards, ratio transformers, high-voltage dividers and several i n st rum en t accessories. Singer Instrumentation Div.
CIRCLE NO . 370
Filter program
A filter program that a llows the filter designer or systems analyst to select a given filter transfer function from a program list is described in a new booklet. Selectab le transfer functions include Bessel, e 11 i pt i c, ButterworthThompson and ultrashperical, plus othe rs. Selection can be made for the filter's geometry, and frequency and impedance transformations. Systems Associates, Inc.
CIRCLE NO. 371
ELECTRO IC D ESIGN 11 , May 24, 1970

Why settle for molded composition
when you can get ·the superior quality of
~ [f[]~[ii]) [f[fil@cl] ~
at even lower prices!

Available in wattages of 1/a, 1/4 and 1/2 ... in
resistance ranges from 1 ohm to 10 megohms .. . at tolerances of 5% and 10% ... Amperex carbon film resistors offer all the advantages of high stability, low noise level and long life that make them ideal for all applications.
Proven superior to competitive molded composition types and priced (for example)
at $50.00 per thousand for a 1/a watt resistor
with a 5% tolerance, Amperex carbon film resistors are immediately available in unlimited production quantities from our main warehouse in Hauppauge, New York as well as from strategically-located distribution centers all over the U.S.A .
For detailed data and evaluation samples, write: Amperex Electronic Corporation,
Component Division, Dept. R,
Hauppauge, New York 11787. For even faster service, phone 516-234-7000.

TOMORROW'S THINKING IN TODAY'S PRODUCTS

'vH\ Y

INFORMATION RETRIEVAL NUMBER 91
139

NEW LITERATURE

SHIELDED BOXES with CARD GUIDES
Rugged die-cast aluminum boxes, slotted to accept Kt circuit
boards and shielding dividers. Excellent for packaging electronic circuitry. Boxes have removable top and bottom covers. Useable inside space: 4"x2"x1 V2". Several models with various connectors.
Write for 1969 Catalog
~ POMONA ELECTRONICS CO., INC.
~ 1500 E. Ninth Street, Pomona, California 91766
INFORMATION RETRIEVAL NUMBER 92

Instrumentation
The 1970 edition of the Honeywell 276-page hard-cover instrumentatjon catalog is available to qualified readers. It covers in separate sections technical information on instruments and systems, applications notes on how and why particular instruments are used and descriptions of supporting services. Products shown include recorders, voltmeters, amplifiers, monitor scopes and data-acquisition and bio-medical systems. Other products include medical instruments1 transducers, rfi/emi instrumentation, and signal-conditioning equipment. Honeywell Test Instruments Div.
CIR~LE NO . 372

Thanks for Visiting the Mitsubishi Booth
We extend our sincere appreciation to all those IEEE Show visitors who took the time to stop by the Mitsubishi Electric booth. The enthusiastic interest shown in the displays was especially encouraging. We are glad to be able to report that our monolithic ICs and mini circulators- VHF . UHF, and SHF, as well as the 700 MHz type- were all favorably received.
Now that the show is over, we welcome any further inquiries from you about the new research developments and techniques.
· ADVANCED AND EVER ADVANCING
#-..MITSUBISHI ELECTRIC Tokyo. Japan INFORMATION RETRIEVAL NUMBER 93
140

Components
The new 120-page Component Selector contains listings and extensive engineering information on new lines of standard products that are said to cover 98% of industry requirements. These products include SCRs, capacitors, lowpass, L-section and rfi /emi filters, enclosed general-purpose relays, dual temperature-rated tantalum foil capacitors and many other components. Cornell-Dubilier Electronics.
CIRCLE NO. 373
ELECTRONIC D ESIGN 11, May 24, 1970

-·

INDUSTRIAL

~~~1~2.LS .. Ii

· CUllHllT -TOllS

· IOI.ID STATE COllTROLS
· TIMI DELAY RELAYS
Industrial controls
Application notes describing a line of monitors and time-delay re lays are included in a revised 12-page catalog. Monitors included are voltage, current, phase-sequence and phase-loss types. Th ese are for single-phase or threephase delta or wye monitoring. Solid-state time-delay relays include delay-on-operate, intervalon-operate, delay-on-release and single-shot models. Diversified Electronics Inc.
CIRCLE NO. 374

HIGH DENSITY
IC PACKAGING PANEL
Modular Type
INCREASES FLEXIBILITY IN PROTOTYPING, PRODUCTION AND FIELD SERVICE.
P Series Panel with Point to Point wiring saves time, space and money. o Available in multiples of 30 IC pattern sections up to 180 patterns.
o Two pins of each pattern tied directly to power and ground planes.
Different numbers avai Iable for different pin assignments.
o IC pattern also accepts 1.0. plugs and adaptor plugs for discrete
components.
o Excellent contact retention and low contact resistance. o Wire Wrap terminations with Tri-level connection length.
Request Complete IC Folder
AU6ATINC. Tel: 617-222-2202 31 Perry Ave., Attleboro, Mass. 02703
INFORMATION RETRIEVAL NUMBER 94

Connectors
A large number of styles and sizes of high-density rack-andpanel connectors are described in a 12-page catalog. Described are military and commercial types with 9 to 51 contacts in plastic and metal s h ells. Included are detailed engineering drawings, photo graphs, and exploded parts views that present all physical parameters and contact locations. l\Iicrodot Inc., Connector Div.
CIRCLE NO. 375

Lamps and magnifiers
A full line of industrial lamps, magnifiers, and magnifier-lamp combinations are described in a comprehensive eight-page catalog. Lamps covered include high-intensity. balanced-arm engineering, magnetic-base, spotli ght and utility lamps. Accessories and prices are also shown. Roxter Corp.
CIRCLE NO. 376
ELECTRON IC D ES IGN 11, May 24, 1970

Asize breakthrough in metalized polycarbonate capacitors
is now produced by S&EI Manufacturing. The new mini-miniature 22 series of SOVDC and 100VDC metalized polycarbonates are available in all standard encasements. They feature an excellent combination of high thermal stability and small size, making them particularly superior for circuits requiring a flat T.C. and low losses. A typical size in our 22R series, of 10.0 mfd. 50VDC, is .58 O.D. x 1.16 in length. A 1.0 mfd. size is .40" ~ .67". So we invite you to call for any special configuration techniques and sizes, or send for our data catalog sheets.
S&fJ{}(} Mcinufacturing/ Capncitors
18800 Parthenia Street, Northridge,Caliiornia 91324 · (213) 349-4111 ·TWX 910-493-1 :!52
INFORMATION RETRIEVAL NUMBER 95

NEW LITERATURE

Microwave products
A line of broadband components for rf, i-f and microwave signalprocessing systems is available in a 12-page catalog. It gives descriptive specifications on over 150 devices offered in standard connector and subminiature PC plug-in types. Hybrids, power dividers, combiners, directional coup lers, and balanced mixers de cribed cover the frequency range of 0 to 3 GHz in multi-octave bands to permit broadband signal processing. Anzac Electronics division of AdamsRussell Co.. Inc.
CIRCLE NO. 377
De power supplies
A complete line of regulated and parametric de power supplies are cover ed in a new eight-page document. It li sts six basic lines and numerous models of de power supplies for both laboratory and systems requirements. Included is such data as regulation, ripple, noise, attenuation, response time, operating temperature, circuitry, dimensions and delivery information. Wanlass Instruments.
CIRCLE NO. 378

~~·
zVm>
V>

_~~\ ....,
..1:;:

semiconductor =0z
."."..'.

SENSITRON

;;:;-

===~-

Power semiconductors
Specifications for a complete line of power transistors, power rectifiers, rectifier assemblies, zener and reference diodes, triacs and SCRs are offered in an 80page catalog. Individual booklets of different colors separate the catalog into various product families. A listing of JAN and J A TX military part numbers is also included. Sensitron Semiconductor.
CIRCLE NO. 380

Thermistor probes
Thermistor probes for precise temperature measurement and control in medical, scientific, and industrial applications are illustrated and described in a new eight-page catalog. It contains complete specifications, prices, and ordering data. Included is information on an improved line of probes offering close tolerances. Also included are extremely small, hi gh-temperature, and linear-output probes. Yellow Springs Instrument Co., Inc.
CIRCLE NO . 381

Dual-in-line packaging
How to mount 5 dual-in-lines in a package 1/ 4 the size of a PC board in 30 seconds without a drop of solder is only one of the features covered in a 16-page catalog. It details how a new high-density IC packaging device eliminates most of the problems associated with PC boards and socket mounting systems while providing highc;apacitance and low-impedance grnund and power plan es . Other areas covered in detail are the device's capability to accommodate dual-in-lines with Yarying tolerances. ACS Industries.
CIRCLE NO. 383
IC sense amplifiers
A series of high-speed sense amplifiers is fully described in an eight-page booklet. Electrical characteristics, recovery and recycle times and logic diagrams are included. Switching characteristics and schematics are also included. Three output configurations that are widely used in this series are shown. Component values are included on schematics. Silicon General Inc.
CIRCLE NO. 384

Resistors and rheostats
Various types of wire-wound resistors, rheostats and accessories are featured in an 18-page catalog. Included are fixed, adjustable, noninductive, axial-lead and lug-ended type resistors with power ratings from 1 to 225 W. Power rheostats with ratings to 300 W are also shown. A discussion on resistor selection and ratings is contained along with resistor temperature-rise curves. Ward Leonard Electric Co.
CIRCLE NO. 379
142

Terminals
Open-barrel terminals for automatic-machine applications are covered in a 32-page catalog. It describes over 825 types that are intended for high-speed automatic installation. The associated automatic machinery is also described. Part numbers, dimensions and material contents are detai led in tabular form. A handy numerical index for locating any part number in the catalog is also included. AMP Incorporated.
CIRCLE NO. 382

SCRs and triacs
Specifications, characteristics, parameters and ratings for the selection and application of SCRs and power logic triacs are contained in a new 112-page catalog. It includes outline drawings, an abundance of characteristic cu rves, dimensional data and pertinent considerations r egard ing device use. A separate section contains information on power control assemblies and a discussion on heat exchangers. International Rectifier.
CIRCLE NO . 385
ELECTRONIC D ESIGN 11. May 24. 1970

Electronics in Canada
Over 200 Canadian electronics co mpanies are listed in a comprehensive booklet, published by the Canadian Government, to serve as a ready reference for anyone who is interested in Canadian electronic products and services. Listings of electronic equipment and systems, components, consumer products and consultant companies include addresses, products and services. A product index shows you exactly where to look for particular requirements. The booklet also outlines the story of the growth and success of the electronics industry in Canada. Canadian Department of Industry, Trade and Commerce.
CIRCLE NO . 386
Rf coaxial connectors
Miniature SMA 3-mm rf coaxial connectors designed to meet r equirements of 'lIL-C-39012 are described in a 32-page catalog. It also contains a complete line of S:'IIB and Si\IC subminiature connectors which meet requirements of l\fIL-C-22557 and MIL-C-39012. The comprehensive catalog con tains specifications and mating characteristics typical to each Ii ne, p lu s detailed mechani cal drawin gs of each connector style. Wherever necessary, recommended cable impedances and type numbers are called out. Sealectro Corp.
CIRCLE NO . 387
Lafayette catalog
The new 116-page 1970 Lafayette Radio Electronics catalog 704 is available. It features highfidelity systems and components, cit izen's band eq uipment, radios, television , tape recorder s and small home appliance . It also features automobile tape players, musical instruments and amplifiers, ca mera eq ui ::iment and specia l closeout prices on speakers. Lafayette Radio Electronics Co r p.
CIRCLE NO . 388
ELECTRONIC D ES IGN 11 , May 24, 1970

eee
Simpson's new 2700.
Versatile Digital System:
· New, fast warm-up*
· 41;2 digits
· 0.05% accuracy · 5 plug-in function modules

DC VOLTAGE

DC CURRENT

RESISTANCE

AC VOLTAGE

· Automatic Polarity Selection · Built-in Self Calibration · 100 Microvolt Resolution · Optional BCD output
· IC Modular Design for reliability

AUTOMATIC RANGING
DC VOLTAGE

2700 DIGITAL SYSTEM
complete with DC voltage range module, test leads, and operator's manual
AVAILABLE "OFF-THE-SHELF" AT ELECTRONIC OISTRIBUTORS STOCKING SIMPSON INSTRUMENTATION PROOUCTS.

ELECTRIC COMPANY
DIVISION
5200 W. Kinzie Street, Chicago, Illinois 60644 · Phone (312) 379-1121 Export Dept: 400 W. Madison Street, Chicago, Illinois 60606. Cable Simelco
IN CANADA: Bach-Simpson ltd., London, Ontario· IN INDIA: Ruttonsha-Simpson Private ltd., International House, Bombay-Agra Road , Vikhroli, Bombay
INFORMATION RETRIEVAL NUMBER 96
14 3

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 concepts 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 and engineering managers doing 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 appear at the end of the Letters column.
· To refuse any advertisement deemed to be misleading or fraudulent.
Microfilm copies are avail able of complete volumes of ELECTRONIC DESIGN at $19.00 per volume, beginning with Volume 9, 1961. Work is now in process to complete the microfilm edition of Volumes 1-8. Reprints of individual articles may be obtained for $2.00 each, prepaid ( $.50 for each additional copy of the same a rticle) no matter how long the article. F or further details and to place ordern, contact the Customer Services Department, University Microfilms, 300 North Zeeb Road, .i}.nn Arbor, Michigan 48106 : telephone (313) 761-4700.
Want to contact us? If you have any comments or wish to submit a manuscript or article outline, address your correspondence to:
ELECTRONIC DESIGN, 850 Third Avenue, New York, N.Y. 10022.
144

PRECISION CARBON FILM RESISTORS

High Voltage . . . High Frequency .. . High Megohm . . . complete specifications for 120 devices and "The Case for Carbon Film" are presented in this new 1970 resistor catalog. Resistors are offered in 15 basic styles, ranging from .25 to 100 watts, with over LOO special variations available. Resistances range from 10 ohms to
100 Terohms and tolerances from ± 1 %. Ap-
plications include those requiring high resistances , voltage capability from 250 to 125,000 V, and high frequency or pulse circuits. Send for free catalog and engineering data.

Resistance Products Company
914 South 13th Street, Harrisburg, Pa . 17104 (717) 236-5081

171

Bus Bars For Noise Reduction

A 16 page Technical Bulletin is now available, describing a new concept in power or signal distribution. Basic mechanical and electrical design principles , along with descriptive pictures and diagrams , are included in this bulletin. These compact buses can replace bulky cable harnesses and repetitive wiring for computer or modular application . This method of construction satisfies the demanding requirements of low inductance and resistance of high speed, solid state systems , while controlling electrical noises.

Send For Free Sample

Eldre Components, Inc.
1239 University Avenue Rochester, New York 14607

172

Quality Fasteners For All Designs

- - ......... . ... ~~--=-·

This 8-page catalog provides design data on the complete group of DZUS 1/4-turn self-locking fasteners for standard, high speed and panel ap· plications , as well as universal high strength multiple thread fasteners for high tensile and shear stresses. Dzus stud assemblies, wire forms and receptacles offer an exceptional , wide variety of combinations from stock to fit specific fastening requirements. Diagrams and tables give full details for rapid, unlimited design selection. Condensed or complete Catalog available on request.

Dzus Fastener Co., Inc.
425 Union Boulevard
West Islip, L. I., N. Y. 11795

173

ELECTRO IC D ESIGN 11 , May 24, 1970

Manufacturers
A dv ertisements of book lets, brochures, catalogs and d ata sheets. To order use R eader-ServiceC ar d
(A dvertisemen t )

PORTABLE POWER SPECTRAL DENSITY SYSTEM ANALYZES VIBRATION AND NOISE ON-LINE

Mini-Ubiq'" Portable Real-Time Power Spectral
Density System

For production or field use; can be carried to automotive test tracks, heavy machine installations , aircraft fli ght lines. Provides, in seconds, a complete picture of the average spectrum , to determine condition of machinery, reveal developing malfunctions, locate source of unwanted noise. System consists of a UA-10 Mini-UbiqTM RealTime Spectrum Analyzer and a 1010 Di gital Averager; produces 200 -point narrow-band spectra in ranges from 10 Hz to 20 kHz wide.

Federal Scientific Corporation
a subsidiary of Elgin National Industries, Inc. 615 West 131st Street, New York, N. Y. 10027

174

Clamp or Tie Wire Bundles In Secondsl

Six-page catalog contains complete ordering information for CAB-L-TITE®clamps and BUND-L-TITE® straps, devices which provide a fast and reliable means of securing wires and wire bundles. Units withstand loadings greater than 50 G 's, are removable in seconds for re-routing wires, and are selflocking-no tying, no knots, no hitches to come loose. Lightweight Du Pont Zytel meets MIL-P-17091 and MIL-P-20693. Proved in aircraft and missiles. Photos, dimensional drawings, tables, physical properties, specifications, price list. Request catalog A.

Dakota Engineering, Inc.
4315 Sepulveda Blvd. Culver City, California 90230

175

DRAFTING AIDS CATALOG

- -DRAFTIH AIDS
...:=::-..":..":.:":..

Send today for the By-Buk Printed Circuit Drafting Aids P-45 Catalog featuring the most comprehensive listin gs of ba sic pressure sensitive printed circuit drafting shapes , tapes and aids. Contain s thousands of pads , tees, elbows , corners , donuts, connectors, fillets , colored tapes , muiti pads for dual in -lines , flat packs , TO cans and mo re. Here is your guide to better printed circuit draftin g. Scores of ideas to speed ma ster artwork preparation time and reduce drafting costs . Send for your free catalog and samples.

By-Buk Company
4326 West Pico Blvd., Los Angeles, Calif. 90019 Phone: (213) 937-3511

176

Electronic Design
Advertising Sales Staff Keith Aldrich Sales Manager
New York 10022 Robert W. Gascoigne Thomas P. Barth Samuel M. Deitch 850 Third Avenue (212) Plaza 1-5530 TWX: 867-7866
Philadelphia 19066 William C. Repetto P. 0 . Box 206 Merion Station, Pa. (215) MA-3-5888
Boston 01945 Joseph F. Palmer 14 Peter Hobart Drive Hingham , Mass. (617) 742 -0252
Chicago 60611 Thomas P. Kavooras Berry Conner, Jr. 200 East Ontario (312) 33 7 -0588
Cleveland Thomas P. Kavooras (Chicago) (312) 337-0588 (call collect)
Los Angeles 90303 Stanley I. Ehrenclou W. James Bischof 2930 Imperial Highway Inglewood , Calif. (213) 757-0183
San Francisco 94022 Arthur R. Shields, Jr. 95 Main Street Los Altos, Calif. (415) 941-3084
London 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 Hi;ayama Electronic Media Service Rm. 601, Daini Miyauchi Bldg. 6-8 -14, Roppongi , Minato -ku Phone: 402 -4556 Cable: Electronicmed ia, Tokyo
....._.~
AMERICAN BUSINESS PRESS, INC.

ELECTRONIC D ES IGN 11 , Ma y 24 . 1970

145

APT-1; 1 cu. in., 3.15 oz. (actual size)
More torque, Less weight
in moving coil mechanism
Highly stable, linear and accurate mechanism for indicating, control or recording systems. 18-0-18° linearity is 1%. Coil design with over 75% of winding "working" in high energy, uniform field air gap assures greater accuracy. Coil system weighs 0.85 gm, develops 26.4 mmg of torque; 31 :1 T/W. Mechanism offers negligible vibration pivots and jewels custom damping - wide range of sensitivities.
AMMON
AMMON INSTRUMENTS, INC. 345 Kelley St., Manchester, N.H. 03105
INFORMATION RETRIEVAL NUMBER 98
Amouse has al~ been saved
froni leukemia. Help us save a man.
For years, you've been giving people with leukemia your sympathy. But sympathy can't cure leukemia, Money can. Give us enough of that, and maybe we'll be able to do for a man what has already been done for a mouse.

Advertisers' Index

Advertiser

Page

ACDC Electronics

____________ J32A-B

Abbott Transistor Laboratories

Incorporated

.... J3, 16 A-B

Acopian Corp.

.. 126

Aerotronic Assoc iates

... 137

Alco Electronic Products, Inc. ..

____ 129, 131

Allco --------------·-·-··---·-

_________ 64B

Allen-Bradley Co.

Ammon In struments. Inc. ...........

....... .146

Amperex Electronic Corporation ___________________ J 39

Analog Devices, Inc.

............ 113

Arrow-Hart, Inc. ·-- _

...44, 45

Augat, Inc.

. ... ..................

........ 141

Beckman ln~truments , Inc.,
Helipot Division Bourns, Inc. ........ . By-Buk Company

____________ 57, 109 27
________ 145

C-Cor Electronics, Inc. ______________________________________ 136

Cambridge Thermionic Corporation

Celanese Plastics Company ............. ........

Centralab, the Electronics Division of

Globe-Union, Inc.

~~~'~:.t;,ii~ed1~~~1ogy, inc:.. : - ·- 1 ~6

Continental Connector Corporation

Cratex

Dakota Engineering, Inc. Dale Electronics, Inc. .......

-------------·--- 145 ____________ Cover II

DDzouws CFoarsnteinnger CCoor.p,orIantci.on ·····-·-··-_-__-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-__5__2_.J4534

Elco Corporation ..

Eldre Components, Inc. ----------------------------------· 144

Electro Cube, Inc.

... 127

Electronic Arrays, Inc. .....................

Electronic Design ..................... Engineered Components Co. _

··--·--------- 147 ......... ____ 128

Erie Technological Products, Inc.

FMC Corporation Federal Scientific Corp.

....... .

- -_-_-__-_-_-_-_-_-_-_-_-_·-_-_-__-_-_-_-_-_-_-_ 114353

Fluke Mfg. Co. , Inc., John

GR! Computer Corp. General Automation, Inc.

62 _______ 115

General Electric Company.

Components Sales Oepration

----------- 8, 9

General Radio Company ·-- -······-··

Gould, Inc., Graphics Division

.. 14, 15

Grant Pulley & Hardware Corporation

Grayhill , Inc.

Advertiser

Page

3M Compan ~·. Scotchpar _

MicroSwitch , A Division of Honeywell --------· 72

Microdot, Inc. Mitsubishi Electric

--··------·-····-·-- 107 ............ 140

Molex Products Company -------····-- --·-----········-· 75

Monsanto Company ------------------·------- 69, Cover Ill Monroe, D1v1s10n of Litton Industries .... 4, 5

Motorola Semiconductor Products, Inc. ..... 6

National Semiconductor Corporation....... 84, 85

Nortronics Company, Inc.

......... 130

Oak Electro/ Netrics Corp. Owens-Illinois, Inc.

....... 130 73

Philips Electronic Components and

Materials Division ·-··------------ ------------·--···· 64A

Pomona Electronics Co., Inc. ___

..... 140

Potter & Brumfield Division of American

Machine & Foundry Company

RCA Electronic Components and

Devices -···---- -----------·--- 10, 65, 76, 111, Cover IV

RCA Institutes, Inc.

RFL Industries, In c.

···---------·- 71

Radiation, Incorporated

____ 34, 35

Raytheon Ccmpany Special Microwave

Devices Operation

Resistance Products Company RtroN Corporation

····--·---_-_-_-_ 1J3444

S & El Corp. Siliconix Incorporated

-- -----·--------······-· t41 _______________ .49, 60

Simpson Electric Company

___ .... 135, 143

Sprague Electric Company

-·····--·-·----- 18, 58

Stackpole Carbon Company ----·-- .... 124. 125

Stackpole Components Company ·------·----·------- 125 Electronic Components G "oup ____________32A-H

Sylvania Electric Products, Jnc.,

Sylvania Electric Products, Inc., Electronic

Components Semiconductor Dept.

Systron-Donner Corpo.-ation,

Datapulse Division

____________________________ 105

Teletype Corporation
Teradyne ........... Triplett Corporation Tun~ Sol Division, Wagner
Electric Corporation

_____94, 95 20 89
16

U. S. Capacitor Corporation
United Transformer Co., Division of TRW, Inc.
Un itrode Corporation

--------- . 119
56 29

Hewlett-Packard ....... -----------------·-·-- 1, 17, 42, 43 , 51 , 54, 101

IMC Magnetics Corp. -·-····-···
Inland Controls, A Division of Kollmorgen --·----·-··-------
Tntronics, Incorporated

__________________ 120 61 31

Vactec Inc. Veeder-Root ....... Venus Scientific, Inc.

-- -------------------· .... 123 7
72

Wavetek -·--·· Winchester Electronics. Division of
Litton Industries

... 102 55

American Cance< SndetJ.

146

Space Conrrib11ted B y /..Ja)1den Publishin g Compan)1, In c.

Johanson M a nufacturing Corp.

. ..... 121

Kepco, Inc.

________________ 116

Xerox Data Systems

Zenith Radio Corporation

-------------- ________ 128

ELECTRONIC D ESIGN 11, May 24. 1970

now you can reach more engineers and reach them faster ...

.,,.
I

,(
I I
,d4
. ;. !;;/ I ;'/- . / {/ If ,/.///
I I
.1

/
)
I
I(

;
i
I

/1
~J
Electronic Design's NEW

r ""'>-....,· , ...._

I I

I·

/
I /

'·

Marketing and salespeople can't specify your products ... engineers can . Products don 't move through distributors until they are specified by engineers. Now there 's a way to reach more* EOEM engineers and reach them laster. It's Electronic Design 's new FAST CLOSE FORM-right up front in the News Section . You can get out your new product story, your price announcements or delivery and distribution information , quickly, while they're still hot. Closing date for film positives is only 24 hours before press time ... 48 hours before the issue mails. You save 3 full weeks over normal closing. The form will accept full pages or spreads in b&w or 2-color; premium is only $150 per insertion. Call your Electronic Design representative today for complete information.
·Electronic Design has 72,271 EOEM engineers and engineering managers-53,372 more than Electron ic News ... 37,998 more than Electronics. Source: December, 1969 BPA and ABC Publisher ·s Statements.

ISSUE DATE
June 7 June 21 July 5 July 19 Aug. 2 Aug. 16 Sept. 1 Sept. 13

ELECTRONIC DESIGN FAST CLOSE SCHEDULE
(Post on your production bulletin board .)

REGULAR CLOSING

FAST CLOSE

ORDER IN N.Y. OFFICE

FILM POS. AT PRINTER

ISSUE DATE

REGULAR CLOSING

May 4 May 18 June 1 June 15 June 29 July 13 July 27 Aug . 10

May 22 June 5 June 19 July 3 July 17 July 31 Aug.14 Aug.28

May 25 June 8 June 22 July 6 July 20 Aug.3 Aug.17 Aug. 31

Sept. 27 Oct.11 Oct. 25 Nov. 8 Nov. 22 Dec. 6 Dec. 20

Aug . 24 Sept. 8 Sept. 21 Oct. 5 Oct. 19 Nov. 2 Nov. 16

FAST CLOSE

ORDER IN N.Y. OFFICE

FILM POS. AT PRINTER

Sept. 11 Sept. 25 Oct. 9 Oct. 23 Nov. 6 Nov. 20 Dec.4

Sept. 14 Sept. 28 Oct.12 Oct. 26 Nov. 9 Nov. 23 Dec.7

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.