Elecraft K3 Schematics Jun 2010
User Manual: K3
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Elecraft K3 Schematics
This document contains the schematics for the Elecraft K3 Transceiver and its internal options. The
schematics are preceded by a Block Diagram for context.
The schematics are ordered as the basic K3/10, then various options.
BLOCK DIAGRAM
K3/10
RF Board Main module
Band Stop Filter 1st IF rejection
Mixer High dynamic range 1st mixer
Crystal Filter Roofing filter
KIO3 I/O module
KANT3 Antenna Connector if no KPA3 installed
KNB3 Pre‐IF Noise Blanker
KREF3 Reference oscillator, Tx mixer/Filter, Rx 2nd Mixer
KSYN3 Synthesizer
Front Panel Control logic
DSP Digital Signal Processing
DSP LPF Optional retrofit for earlier DSP boards
10‐watt PA Low power amplifier
OPTIONS
KBPF3 General Coverage Receiver Bandpass Filters
KXV3 Transverter Interface and Receive Antenna Switching
KXV3A Transverter Interface and Rx Ant Switch w/K144XV Support
KAT3 100‐watt Antenna Tuner
DVR Digital Voice Record/Playback
KPAIO3 Part of 100‐watt PA
KPA3 Part of 100‐watt PA
AuxDSP Part of KRX3 Second Receiver
KRX3 Part of KRX3 Second Receiver
K144XV Internal 2m Module
Copyright © 2007‐2010, Elecraft, Inc. All Rights Reserved.
64
K3 Block Diagram
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
1
2
3
4
5
6
7
8
9
J76
KIO3
P44E
1 2 3
P44C
1 2 3
SPKR_R
SPKR_L
AUXBUS
RXD
TXD
/KEY_IN
/PTT_IN
W. Burdick
Elecraft
Rev. Sht. DateBy
Appendix B
K3 RF Board
SCK3
MOSI3
7R
7T
40 40
40 40
27
C120 C157
C144
K6A K6B
C86
C154
C126
C174 C188
C182
K8A K8B
C149
C181 C185
C136
C78
C79 C84
150
560 560
150
470
39
2
39
470
220
2
220
K1A K1B
C81
1300
C82
1300
K7
L18
2
4
3
9
7
8
2
4
3
9
7
8
2
4
3
9
7
8
24
3
9
7
8
J12
J15
Key Out
J14
PTT In P a d d l e
FSK IN
XVTRON
1
2
3
4
5
6
P44A
5A
SCK3 MISO3
LD_IO
MISO3
K6
K5
K8
K9
K3
1
K1
1
10
SRCK
SOUT
/CLR RCK
SIN
VCC
/Q0
/Q1
/Q2
/Q3
/Q7
/Q6
/Q4
/Q5
GND
10
15
14
13
12
11
16
/G 9
2
3
1
4
5
6
7
8
U4
SCK3
MOSI3
.01
C165
C163
C164
C108
C75
C160
C90
5A
TPIC6C595D
K7
K4
1
10
SRCK
SOUT
/CLR RCK
SIN
VCC
/Q0
/Q1
/Q2
/Q3
/Q7
/Q6
/Q4
/Q5
GND
10
15
14
13
12
11
16
/G 9
2
3
1
4
5
6
7
8
U2
SCK3
C111
C191
5A
TPIC6C595D
MOSIBPF2
Band-Pass Filters
MISO3
1 of 4
/PWR_ON
40
C180 40
C184
L13
1.0
L12
1.0
L11
1.0
40
C135 L10
1.0 40
C134
40 40
40 40
C119 C156K3A K3B
C153
C125
C146
C179 C183
C133
1000
100 100
1000
K4
2
4
3
9
7
8
24
3
9
7
8
L9
4.5
40
C132
L8
4.5 40
C131
C118 C155
K5A K5B
C152C124
820
120 120
820
2
4
3
9
7
8L7
1.0
40
C130
L6
1.0
40
C129
C142
5
C123
100 C122
100
C117
56
C116
56
L5
4.5
L4
K2A
24
3
K2B
97
8
C173
1500
90
C178
C172
1500
90
C177
L3
0.25 L2
0.25
L1
0.25
C141 3.9 C140 3.9
K9A
2
4
3
K9B
9
7
8
20
C128
Q3
IRFI630 G
D
SR4
10K
RFC4
100
RFC3
RFC2
RFC1
/DASH
/DOT
/KEY_IN
/PTT_IN
C74
C107
C92
.001
C89
20
C148
C139 33
C187
33
20 C147
C138 33
C186
100
.01
C190
(Attn., SH. 4)
K10
C93
LINE_IN-
BK_MICAF-
LINEOUT_R
BK_PH_L
BK_PH_SW
LINE_IN+
BK_MICAF+
LINEOUT_L
BK_PH_R
ALC
12U
N:10
C223
22
C99
.047
Aux. BPF
L33
11.5
8.215 MHz
11
C218
K2
.01
C240
Relays
BPF
C236
.047
C61
.047
Relays
BPF
6 m
10/12 m
15/17 m
20/30 m
80/160 m
40/60 m
+
C2
+
C3
470 µF
C231
.047
C239
.047
C189
.01
(80) (80)
(160) (160)
(10/12 m)
(15/17 m)
(40/60 m)
(20/30 m)
(6 m)
(80/160 m)
(80 or 160 m)
(17/10 m or 15/12 m)
(60/20 or 40/30 m)
(60/20)
(40/30)
(17/10)
(15/12)
L16
1.2
C1
390
Q5
2N7002
G
D
S
7R
100
C251
J13
Key
RFC49
12A
12B
12B
12B
12B
MOSIBPF1
.01
C274
.015
C275
250V
12B
10
BPF_IF2
BPF_IF2
R28
100
LD_BPF
LD_BPF2
LD_BPF2
P44A/C/E
10
11
12
1
2
3
4
5
6
7
8
9
J64A
Sub Rcvr
7R
7T
BPF_RF
W4
SUBRX BYP
(Sh. 2)
C50
24
1
3
2
4
5
Z3
Stop-Band Filter
W30 W31
W32
W33
RFC36
100
R72
470
L35
11.5
8.215 MHz
11
C257
C71
24
BPF_IF
W15
RF CHOKE RFC53 & C143 MOD
B2 1/8/10
82RFC53
(C143 on rev A PCB)
* = Recent Changes
*
Switch
5.6 50
RFC32 RFC33
220
C70
C67
C72
2200
T-R
0.1
0.1
R58
D27D26 MA4P
4007
D31
Gro u n d
E1
VIPA
VTPA
W3
PA BYP
W. Burdick
Appendix B
K3 RF Board
A B
C D
T3
A B
C D
T4
D37
D36
BAS70
C53
.01
C52
.01
10K
R55
R46 R38
10K
R54
10K
R53
10K
R52
/FSCL /RSCL
7R
7T
SWR Bridge
100
RFC31
C260
0.1
100
R51
100
R50
7T
7R
R44 R35
51 51
W2
W1
XV
R X A
150
R57
100
RFC30
Relays
LPF
K12
K11
K15
K16
K17
K13
1
16
BPF_RF
SCK3
MISO3
V12SPA
MISO3
MOSI3
LD_XV
FCT
SRCK
SOUT
/CLR RCK
SIN
VCC
/Q0
/Q1
/Q2
/Q3
/Q7
/Q6
/Q4
/Q5
GND
10
15
14
13
12
11
16
/G 9
2
3
1
4
5
6
7
8
U5
SCK3
MOSI3
MISO3
.01
C161
C76
C109
C192
C166
C112
C94
C91
5A
TPIC6C595D
SRCK
SOUT
/CLR RCK
SIN
VCC
/Q6
/Q5
/Q4
/Q3
/Q1
/Q0
/Q7
/Q2
GND
10
15
4
3
5
14
16
/G 9
2
13
1
12
11
6
7
8
U8
SCK3
MOSIPA
5A
/FSCL
/RSCL
470
R49
2 of 4
10 11 12 13 14 15 161 2 3 4 5 6 7 8 9
J66 RF Acc.
MOSI3
C219
.01
12PA
12A
.01
C227
22K 22K
C230
0.1
2.2K
R34
12A
C241
.015
K14
(80 m)
(160 m)
(15/17 m)
(40/60 m)
C33
1 µF
12345
P 7 1 A
12345
P 7 1 C
101 2 3 4 5 6 7 8 9
P 7 1 B
Z2 LPA
C261
2200
100
RFC45
51
R48
5
67
+
-
3
2
1
+
-
8
4
U16
LM358
VFWD2
VFWD2
VFWD VREFL
Q7
ZVN3320
RFC46
100
8A
D25
64-05
100W
100
C51
LD_LPF
BYP
10
11
12
13
14
15
16
17
18
19
20
1
2
3
4
5
6
7
8
9
P6 7 A
100 W PA In
7R
7T
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
1
2
3
4
5
6
7
8
9
P67 B
100 W PA Out
10W
10
11
12
13
14
15
16
17
18
19
20
1
2
3
4
5
6
7
8
9
P7 0
ATU
12B
W19
C264
.047
1.0
C268
C267
0.1
C266
.01
C269
LD_LPF
MOSIPA
12B
SCK3
MISO3
LD_ATU
SCK3
W21
W20
BYP
7R
12A
P72
1 2
ATU (not used)
(Sh. 1)
K18 (6m OUTPUT)
(6m INPUT)
(20/30 m)
(6/10/12 m)
C278
.01
C282
C284
C279
C277
.01
C283
C281
C280
C63
0.1
K13B
K13A C151
C168
C176
C114 C121
C137
C85 C97 C103
C95 C101
C159 C170
C115 C127
C113
C105
K14B
K14A
L19 L21
L27 L30
L25 L26
L23
11
9
13
6
8
4
6
8
4
11
9
13
C73 C77 C80
K11B
K11A L14 L17
6
8
4
11
9
13
C83 C96 C102
C88 C100
C110
C104
K15B
K15A L20 L22 L24
6
8
4
11
9
13
Elecraft
Rev. Sht. DateBy
C145
C162 C171
L29 L32
K18
K12B
K12A
C150 C167 C175
C158 C169
L28 L31
11
9
13
6
8
4
80 m
C87 C98
6m
11,6
C216 C217
C234 C235
160 m
C64 C65
10/12 m
15/17 m
20/30 m
40/60 m
Low-Pass Filters
9,8
13,4
K17 11,6
9,8
13,4
K16
11,6
9,8
13,4
Reset = 160-15m; Set = 12-6m
L34
C276
C259
5600
RX: -20 dB
@ 0.5 MHz L34/C276
not used
B2 1/8/10
W. Burdick
Elecraft
Rev. Sht. DateBy
Appendix B
K3 RF Board
10 11 12
P3 0
13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 281 2 3 4 5 6 7 8 9
Front Panel
12345
P3 5
AUXBUS
/PTT_IN
/DOT
/DASH
/KEY_IN
/CSRFMUX
ADR0
ADR1
ADR2
ADR3
MOSI
VRFADC
FCT
RXD
TXD
XVTRON
/SPI_23_EN
12
J10
J11
12V Out
12V In
D34
1N4007
D6
SB530
F1
6A
FDS6375
Q2
G
DS
D28
BZW50-15
R76
2.7K
OUT
GND
IN
U13
OUTA
OUTB
INA
GND
INB
V+
NC NC
1
2
3
4 5
6
7
8
U11
TC4427
OUT
GND
IN
U12
7R
7T
8A
3 of 4
5A 8A
5R 5T
MOSI
ADR3
ADR2
ADR1
ADR0
/CSRFMUX
SCK3
LD_XV
LD_IO
LD_BPF
MOSI2
LD_SYN2
LD_SYN1
/CSPLL2
/CSPLL1/CSDDS2
/CSDDS1
LD_IF_S
LD_LPF
LD_ATU
LD_IF
MOSI3
TDI
GND
TMS
VCC
GND
VCC
GND
TCK
VCC
TDO
GND
VCC
25
14
5
31
21 22
16
17
6
30
8
28
18
15
24
3
26
19
20
29
27
23
32
2
44
43
36 42
40
39
38
41 37
35
34
IO
IO
IO
IO
IO
IO
IO
IO
IO
IO IO
IO
IO
IO
IO
IO
IO
IO
IO
IO
IO
IO
IO
IO
IO
IO
IO
IO
IO
IO
IO
IO
1
12
10
4
13
33
7
11
9
U7
CPLD
ATF1502
/SPI_23_EN
CH6 CH2
VEE
COM
CH5
INH
CH1
VSS
VDDCH4
CH7
CH3
CH0
10
11
12
13
14
15
16
B
A
C
1
2
3
4
5
6
7
8 9
U6
V12SPA
VRFADC
VTPA
VIPA
4051
R12
R11 MISO2
MISO3
2.7K
C66
.01
C54
.01
VI_LO
2.7K
VIFGAIN2
10
11
12
13
14
15
16
17
18
19
20
1
2
3
4
5
6
7
8
9
J73
Synth 1
8A
/CSPLL1
/CSDDS1
5A
LD_SYN1
10
11
12
13
14
15
16
17
18
19
20
1
2
3
4
5
6
7
8
9
J74
Synth 2
8A
5A
LD_SYN2
/CSPLL2
/CSDDS2
MOSI2
MISO2
SCK2
MOSI2
MISO2
SCK2
10
11
12
13
14
15
16
17
18
19
20
1
2
3
4
5
6
7
8
9
P5 0
DSP A.F. I/O
10
11
12
13
14
15
16
17
18
19
20
1
2
3
4
5
6
7
8
9
P5 1
DSP I.F. I/O
RX1_IF-
VIFGAIN1
100HZ
RX2_IF-
VIFGAIN2
VREFL
RX1_IF+
TXIF+
RX2_IF+
VFWD
BK_PH_R
LINEOUT_L
BK_MICAF+
SPKR_L
SPKR_R
BK_PH_SW
LINEOUT_R
BK_MICAF-
FSK IN
TXIF-
C58
470µF
+
MC7805ACT MC7808ACT
C57
470µF
+
C56
220µF
+
LINE_IN+LINE_IN-
ZXTC1010
LOAD
IOUT
GND
VIN
NC
1
2
3
4
5
U1
R36 0.05 Ω
VI_LO
R13 1K
FSK IN R14
100
12A
RFC6
C31
.047
C42
.047
RFC5
5A
/PWR_ON
C62
.01
C60
BT1
3 V Batt.
ALC
BK_PH_L
C220
.047
MOSI3
MISO3
LD_IF_S
100
+
-
12U
12PA
R77
2.7K
C226
.047
RFC40
C224
.047
C225
.047
VCO1
VPLL1
12A
VPLL2
12A
SCK3
5A
5A
+
-
X
LOAD
DOUT
/OE
GND
VDD
DIN
SCK VBB
Q10Q7
Q6
Q1
Q5
Q8
10 11
12
Q3
13
Q2
14
15
16
NC NC
Q4
17
18
19
Q9 20
1
2
3
4
5
6
7
8
9
U10
A6810
SCK3
LD_IF
5A
R82
R78
R79
R81
R80
MOSINB
MOSI3
R78-R82 = 100
PRE_ON
PRE_OFF
TXMIXFIL
R2
470
C246 .047
C247
.047
C248
.047
RX2_IF-
RX2_IF+
5A
C69
.047
VPLL2
VPLL1
10
1
2
3
4
5
6
7
8
9
P 7 9
CPLD Pgm
HAGC1
HAGC2
HAGC2
1 2 3 4 5 6 7 8
J75
Ref./2nd LO/2nd TX
100HZ
TXMIXFIL
RFC23
100
7T
C222
0.1
1.8K
R5
TXIF-
TXIF+
FL4
FL5
FL1
FL2
FL3
C255
.047
C254
C253
.047
C252
RFC43
100
RFC44
100
C35
10 µF
5A
NB1LVL
R87 470
VFWD
R88 470
VREFL
100HZ
RFC47
100µH
12D
12D
5D
5D
101112 123456789
J 6 4 B
Sub Rcvr
C270
.01
C265
0.1
C271
.01
RFC48
C272
.047 10µH
BW1
BW3
BW2
MISO
SCK
MISO
SCK
R91
100
SCK2
SCK3 ALT (TBD)
OUT
GND
IN
U17
78L09
C45
10µF
12A
LD_BPF_S
LD_BPF_S
+
12A
Q11
10K
R27
BC807
1µH
C35A
(not used)
9V
R98
10K
R99
10K
5A
R100
1K
D35
1N4007
F2
0.6A
W34
1/8/10B2
*
* = Recent Changes
VPOST
(Jumper, rev. A PCB)
*
*
P95
12V TO K144XV
*
R31
D23
470
1N914
*
*
D23-24 and R31-32
Are not on rev A PCB
R32
D24
470
1N914
*
*
*
(CUT)
(CUT)
*
Vfwd/Vrefl traces @P51
must be cut on rev A PCB
W. Burdick
Elecraft
Rev. Sht. DateBy
Appendix B
K3 RF Board
NE46134
150
C204
C202
C195
R60 R75
6.2Ω
R66
.047
100
68
100
Q8
.047
R45
R37
R43
.047
15
C211 .047
12A
SCK3
MISO3
MOSINB
LD_IF
RFC39
47 µH
NB1LVL
12A
5
67
+
-
U15B
3
2
1
+
-
8
4
U15A
14
2.7K
RP1
3
C201
0.1
C215
51
33KR42
6.2 Ω
R33
12
C214
1.0µF
C200
0.01
C213
51
33KR41
6.2 Ω
R40
2.7KRP1
1 6
C212
1.0µF
C199
0.01
C48
64-04
D22
64-04
D21
RFC27
100
D33
T5
4
3
1
2
G
D
S
Q1
C47
C46
R30
R29
R26
C44
R25
C43
RFC25
100
RFC24
100
C40
C39
J309
C198
220µF 100
R39
12A
+
.047 .047
.047
100
.047
22
1K
.047
0V = MAX GAIN, 3V = MIN
LM833
27
C19
.01
C17
R23
.047
560
R21 100
C12
C11
RFC20
RFC18
R19 100
C10
C9
RFC17RFC16
R18 100
C8
C7
RFC15RFC14
R17
100 C6
C5
RFC13
RFC12
R16
620
RFC11
100
Crystal Filters
FL4
FL3
FL2
FL1
VCO1
12345
Z1
560
R63
Preamp
NE46134
220
470
C209
R67
R59
R62
R74
18
0.1
R65
Q4
15
18
C210
.01
1K
R61
RFC10
100
R73
1K
C106
100
RFC9
100
7T
C207
68 RFC34
100
C221
.047
2
43
9
7 8
K10
Attn.
C194
.047
R70
470
C206
68
C205
100
C15
C16
RFC38
100
RFC8
100
PRE_OFF
C26
15
R20 100
C14
C13
RFC21RFC19
C203
0.1
R68
8.2Ω
FL5
7R
C41
R22 620
R15
1K
C4
R69
470
RFC35
100
R1
470
C208
.047
C193
.047
RFC37
100
-10 dB
4 of 4
T6
1
3
2
4
.047
D8
64-04
D7
D9 D10
C21
15
D17
D18
C25
15
D15
C24
15
D13
C23
15
D11
C36
22
C22
22
D20
D19
C29
22
D16
C28
22
D14
C27
22
D12
D5 D4
D3
64-05
D2
12A
C228
.047
RFC41
100
C233
.047
PRE_ON
1
2
P 8 6
I.F. Out
Q9
R56
8.2Ω
RFC29
100 µH
.047
C229
.047
8A
RFC42
100
C232
.047
6T
D1
.047
C242
.047 C243
.047
C245
.047
C244
.047
.047
2.7K
RP1
51
(not used)
8A
C237
.047
GS
D
Q10
J309
C55
.01
R8
13K
RFC22
100
R9
220
C68
.047
C59 .047
7R
RX1_IF-
RX1_IF+
C4-C14 = .047 µFRFC12-RFC21 = 100 µH
R7
1.8K 51
8A
C196
.01
C197
.01
D29
BAV99
D30
C238
0.1
R86
4.7M
HAGC1
3
2
1+
-
8
4
U3A
V-
V+
1
2
3
5
4
67
8
U9
C249
1.0µF
SA612
J 8 1
RXLO2
J 6 5
T X I F 1
C20
.01
TP1
TLV2462
R10
100
C250
.047
R83
100
7 R - 2
7R-2
C37
.047
7T-2
7T-2
7T
R84
100
C256
.047
7R 7R-2
(W6)
C30
120
C34 .047
C32
.047
C258 .047
X1
BW = 14 kHz
2nd RX
Mixer
(W14)
P45A
P46A
P47A
P48A
P49A
P45 B
P46 B
P47 B
P48 B
P49 B
C262
.01
I.F. Amp
C38
.01
R6 300
R3 300
R24 18
8.230 MHz
(W7)
8.215 MHz
R64
620
W17
W18
1234
P45C
12B
1234
P46C
1234
P47C
BW3
BW2
BW1
RFC7 100
7T
C273 .047
W16
W22
Post-amp
(Not on rev. XA PCB.)
F L 5
F L 4
F L 3
F L 2
F L 1
10 11 121 2 3 4 5 6 7 8 9
J 7 7
Noise Blanker
HAGC Det.
5A
5
6
7
+
-
U3B
VIFGAIN1
FL5/4/3 BW Control
XF2
M1
M2
8A
BAV99
D38
+11 dB
R89
4.7K
L36
18
X2
C49
10
L37
27
C18
0
L39
2.8
L38
2.8
RFC50
100
C285
150
16:5
BPF_IF
470K
R85
D32
Not on Rev A PCB
XF1
R102 1.8K
D40
R101 on Rev A PCB
Not on Rev A PCB
B2 1/8/10
VPOST *
* = Recent Changes
*
*
C:\Elecraft\Henry\Modules\Beta\BSF\Schematic\BSF.sch - Sheet1
C:\Projects\K3\Schematics\KR MixerRevXC.sch - Sheet1
C4 C5
X2 X3 X4
C6C3
X1 X5
C2 C7
L1 L2
C1 C8
E660032: 8.2125 MHz +/- 200 Hz; Lm = 25 mH +/- 2 mH, Co < 4 pF, Q > 100 K
E660027: 8.214 MHz +/- 200 Hz; Lm = 25 mH +/- 2 mH, Co < 4 pF, Q > 100 K
*
For CW bandwidths, X1-X5 must be hand-selected to 10 Hz, and for SSB bandwidths, 50 Hz.
CA CB
8.215 MHz 500 Ω 250 Hz 150 pF 750 pF 750 pF 750 pF 750 pF 750 pF 750 pF 0 pF 2.3 µH E660027
8.215 MHz 500 Ω 6000 Hz 0 pF 62 pF 47 pF 62 pF 47 pF short 62 pF 10 pF 16 µH X1, X3, X5 = E660027; X2, X4 = E660032
8.215 MHz 500 Ω 1000 Hz 63 pF 180 pF 240 pF 180 pF 240 pF 180 pF 240 pF 0 pF 3.9 µH E660027
8.215 MHz 500 Ω 3000 Hz 0 pF 51 pF 51 pF 51 pF 51 pF short 51 pF 0 pF short E660032 (4-crystal filter w/1dB ripple; X5 = short)
Fc Zin/out BW @ -6 dB C1,C8 C2 C3 C4 C5 C6 C7 CA,CB L1, L2 Crystal p/n, Inductor Windings, Notes
8.215 MHz 500 Ω 500 Hz 120 pF 470 pF 390 pF 470 pF 390 pF 470 pF 390 pF 0 pF 2.8 µH E660027; L1, L2 = 24 T #28 on T30-2
12
J1
1
2
J2
To RF Board, P45A-P49A To RF Board, P45B-P49B
FL1
CC
.01
CD
.01
Filter Module
NOTES:
2. CC and CD are used with a filter module (FL1). All other components are only used for constructing a discrete filter.
3. X1-X5 can be either 2- or 3-lead HC49/U types. Grounding pads are provided for both.
2
1
4
3
W. Burdick
E. Swartz
Elecraft
Rev. Sht. DateBy
1 of 1
KFL3A Filter Board
1. This PCB can be used to assemble a discrete 5-pole crystal filter, or as a carrier for filter modules (INRAD, etc.).
8.215 MHz 500 Ω 2700 Hz 0 pF 110 pF 47 pF 68 pF 68 pF 51 pF 68 pF 0 pF short E660032
8.215 MHz 500 Ω 3000 Hz 0 pF 62 pF 47 pF 62 pF 47 pF short 62 pF 0 pF short E660032 (4-crystal filter w/0.5 dB ripple; X5 = short)
B 6/20/07
8.215 MHz 500 Ω 200 Hz 120 pF 2700 pF 620 pF 1000 pF 1000 pF 620 pF 2700 pF 0 pF 2.8 µH E660027
5
5
4
4
3
3
2
2
1
1
D D
C C
B B
A A
Mounting Holes for
KIO3 Faceplate
2005042501 C
KIO3 Main
Elecraft, Inc. Copyright (C) 2007 - 2010.
L Johnson
B
13Wednesday, June 16, 2010
Title
Size Document Number Rev
Date: Sheet of
Sheet 2
BAND2
/PWR_ON
/PTT_IN
DTRA
nKEYOUT
DIGOUT0
DIG0
AUXBUS
DIG1
RTSA
BAND1
RXD
BAND3
ALC
TXD
DIGOUT1
BAND0
Sheet 3
BK_MIC_AF+
BK_MIC_AF-
LINE_IN+
LINE_IN-
BK_PH_L
BK_PH_R
SPKR_L
SPKR_RSW
MICBIAS
LINEOUT_L
LINEOUT_R
BK_PH_SW
ALC
BK_PH_SW
BK_PH_R
BK_PH_L
LINEOUT_R
BK_MIC_AF+
LINE_IN+
/KEY_IN
MOSI_3
+8T
+12SW
+12UNSW
AUXBIUS
SPKR_R
MOSI_3
LD_IO
MICBIAS
RTSA
/KEY_IN
BAND1
BAND0
BAND2
DCTRL1
nKEYOUT
DTRA
DCTRL3
/PWR_ON
RXD
TXD
DIG1
DIG0
LINE_IN-
BK_MIC_AF-
LINEOUT_L
SPKR_L
+8R
+8R
LD_IO
LD_IO
/PTT_IN
/PTT_IN
DCTRL2
DCTRL0
BAND3
DIGOUT0
DIGOUT1
MISO_3
/RSPKEN
/RSPKEN
VCC5
VCC5
VCC5
+12SW
+12SW
+12SW
VCC8A
VCC5
+12SW
U3
UA78M08CDC
1
2 4
3
+VIN
GND TAB
OUT
R8 1K
U5
TPIC6C595D
3
4
5
6
11
12
13
14
9
2
15
7
10
8
1
16
Q0
Q1
Q2
Q3
Q4
Q5
Q6
Q7
SDO
SDI
SCK
SCLR
RCK
OE
VCC
GND
TP1
GND
1
2A
B
C28
100 pF
R18 10K
R25
470R
C16
0.1 uF
C22
0.1 uF
Q3 MMBT3904
1
2 3
Q7
MMBT3904
1
2
3
Q4 MMBT3904
1
2 3
RP1A 100K
18
C14
0.1 uF
RP1D 100K
45
R23
100R
P76
RF Board
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
32
33
34
35
36
Q6 MMBT3904
1
2 3
C15
0.1 uF
Q8
MMBT3904
1
2
3
U2
UA78M05CDC
1
2 4
3
+VIN
GND TAB
OUT
+
C11
10 uF/25V
U6
TPIC6C595D
3
4
5
6
11
12
13
14
9
2
15
7
10
8
1
16
Q0
Q1
Q2
Q3
Q4
Q5
Q6
Q7
SDO
SDI
SCK
SCLR
RCK
OE
VCC
GND
RP1B 100K
27
MT1
1
Q5 MMBT3904
1
2 3
RP2 10K
1 2
3
4
5
6
7
8
910
C27
0.1 uF
R16
10K
R26
470R
+
C8
10 uF/25V
K1
DPDT
3
2
4
8
9
7
1
10
MT2
1
RP1C 100K
36
R12 1K
5
5
4
4
3
3
2
2
1
1
D D
C C
B B
A A
ACC COM
ACC DO1
Approximately 1 kHz
ACC DO0
ACC BND1
RS232 TXD
ACC BND2
RS232 RTS
ACC DI1
+5V
ACC DI0
ACC BND0
RS232 DTR
RS232 COM
ACC ALC
ACC PWR
ACC KEY
ACC AUX
RS232 RXD
ACC PTT
ACC BND3
2005042501 C
KIO3: Main, Sheet 2
Elecraft, Inc. Copyright (C) 2007 - 2010.
L Johnson
A
23Wednesday, June 16, 2010
Title
Size Document Number Rev
Date: Sheet of
D
0
TXD
BAND3
/PTT_IN
DTRA
RXD_X
DTR_X
RTSA
nKEYOUT
T
1
BAND2
/PWR_ON
BAND0
BAND1
AUXBUS
ALC
DIG0
RTS_X
DIGOUT0
DIGOUT1
TXD_X
DIG1
RXD
+12SW
VCC8A
VCC5
VCC5
R6
10R
Q2
2N7002K
1
32
C31
1000 pF
R5
2.7K
R1 1K
C41
1000 pF
C34
1000 pF
+
C9
100 uF/16V
R3
10K
C40
1000 pF
C37
1000 pF
D1
BAT54S
1 3
2
C7
0.01 uF X7R
C12
1000 pF
C32
1000 pF
C1
0.1 uF
L1 100 uH
+
C10
33 uF/16V
U1
LT1039ACN
1
2
3
4
5
6
7
89
10
11
12
13
14
15
16 V+
R1in
T1out
R2in
T2out
R3in
T3out
V-GND
T3in
R3out
T2in
R2out
T1in
R1out
VCC
R2
1K
C42
1000 pF
C6
0.022 uF X7R
R7 27K
C43
1000 pF
C44
1000 pF
C30
1000 pF
C38
1000 pF
C35
1000 pF
Q1
MMBT5089
1
2
3
J90
D-Sub IO Board
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
C2
0.1 uF
R4 27K
C4
1000 pF
C3
0.01 uF X7R
C29
1000 pF
C13
1000 pF
C5
1 uF/16V
C39
1000 pF
C36
1000 pF
C33 1000 pF
TXD
BAND3
DIGOUT0
/PTT_IN
BAND2
/PWR_ON
AUXBUS
ALC
BAND0
RTSA
RXD
DTRA
DIG0
nKEYOUT
BAND1
DIGOUT1
DIG1
5
5
4
4
3
3
2
2
1
1
D D
C C
B B
A A
This resistor sets gain of mic preamp.
LOUT L
SP C
SP L S
PH L
SP L
PH SW1
PH R
LIN C
PH C
LOUT R
LOUT C
PH SW2
LIN L
SP R
MIC A
MIC C
2005042501 C
KIO3: Main, Sheet 2
Elecraft, Inc. Copyright (C) 2007 - 2010.
L Johnson
B
33Wednesday, June 16, 2010
Title
Size Document Number Rev
Date: Sheet of
BK_MIC_AF+
BK_MIC_AF-
LINEOUT_L
LINEOUT_R
BK_PH_SW
BK_PH_L
BK_PH_R
LINE_IN+
LINE_IN-
MICBIAS
SPKR_RSW
SPKR_L
LINEJACK_COM
LINEJACK_L
VCC8A VCC8A
VCC8A
VCC8A
C21 470 pF
P25
INT SPKR
1
2
RP3D
10K
4 5
J91
Audio IO Board
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
C50
1000 pF
Q9
MMBT3906
1
23
C24
1000 pF
T3
TTC-108
1 6
3 4
RP3B
10K
27
R10 2.7R
R17
10K
C47
0.1 uF
TALT1
LM-NP-1001
1 8
4 5
+
-
U4A
LM833D
3
2
1
84
R24
62R
C51
1000 pF
C48
1000 pF
C23
1000 pF
TALT2
LM-NP-1001
1 8
4 5
C45
0.1 uF
T2
TTC-108
1 6
3 4
C19
1 uF
T1
TTC-108
1 6
3 4
R14 5.6K
R13 604R
RP3A
10K
1 8
C20
1000 pF C18
1000 pF
+
C17
10 uF/25V
R20
51R
R9 2.7R
R15
10K
C52
0.1 uF
TALT3
LM-NP-1001
1 8
4 5
C46
0.1 uF
RP3C
10K
36
R22
10K
C49
1000 pF
R21
10K
C25
1000 pF
+
-
U4B
LM833D
5
6
7
84
R19
51R
R11 2.7R
C26 470 pF
BK_MIC_AF+
BK_MIC_AF-
SPKR_RSW
LINEOUT_L
LINEOUT_R
BK_PH_R
BK_PH_L
BK_PH_SW
LINE_IN+
LINE_IN-
MICBIAS
SPKR_L
5
5
4
4
3
3
2
2
1
1
D D
C C
B B
A A
PH C
SP L S
LOUT R
SP L
LOUT L
SP L C
MIC C
LIN C
SP R
LIN L
MIC A
PH SW1
LINE C
PH SW2
PH R
PH L
2005042501 A
KIO3: Audio IO Board
Elecraft, Inc. Copyright (C) 2007 - 2010.
L Johnson
A
11Wednesday, June 16, 2010
Title
Size Document Number Rev
Date: Sheet of
SPK_R
SPK_LC
LINEJACK_L
SPK_LS
SPK_L
LINEJACK_R
LINEJACK_COM
LIN_LX
MIC_A
LIN_CX
PH_SW1
PH_L
PH_R
R1
2.7R
L13 BEAD
C9 1000 pF
P91
KIO3
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
J21
LINE IN
2
4
5
1
C7
0.1 uF
C1 1000 pF
L3 100 uH
L9 100 uH
C10
0.1 uF
L1 100 uH
C2 1000 pF
J22
LINE OUT
2
4
5
1
C6
0.1 uF
L6 100 uH
L4 100 uH
L14 BEAD
C5 1000 pF
L10 100 uH
L11 100 uH
J19
PHONES
6
7
1
4
8
3
5
C12 1000 pF
L5 100 uH
C8
0.1 uF
L16 BEAD
C4
0.1 uF
J18
SPEAKERS
2
4
5
1
J20
MIC
2
4
5
1
C3 1000 pF
C11
0.1 uF
R2
2.7R
L2 100 uH
L12 100 uH
5
5
4
4
3
3
2
2
1
1
D D
C C
B B
A A
RS232 COM
RS232 DTR
RS232 TXD
RS232 RTS
RS232 RXD
ACC COM
ACC BND0
ACC BND1
ACC BND2
ACC BND3
ACC KEY
ACC PWR
ACC ALC
ACC PTT
ACC AUX
ACC DI0
ACC DI1
ACC DO1
ACC DO0
Frame Ground
FSK IN
XVTR_ON
COMMON
AUXBUS
PWR_ON
BANDOUT_0
BANDOUT_1
BANDOUT_3
BANDOUT_2
PTT_IN
KEYOUT_LP
ALC_IN
COMMON
DIG_OUT_1
DIG_OUT_0
ACC PIN FUNCTION DIRECTION
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
DE9 PIN FUNCTION DIRECTION
2
3
4
5
7RXD_OUT
RTS_IN
TXD_IN
DTR_IN
COMMON
<---
--->
--->
<---
<---
<-->
--->
--->
--->
--->
--->
--->
<---
--->
<---
<---
<---
+5V
Frame Ground
2005042501 B.1
KIO3: D Sub RS232 IO Board
Elecraft, Inc. Copyright (C) 2007 - 2010.
L Johnson
B
11Wednesday, June 16, 2010
Title
Size Document Number Rev
Date: Sheet of
DTR_X
SER_C
TXD_X
KEY_X
BND2_X
BND3_X
ALC_X
PWR_X
DIGO_X
DIG1_X
DIGO1_X
AUX_X
BND0_X
PTT_X
BND1_X
RXD_X
RTS_X
DIG0_X
C11
1000 pF
R1 137K 1%
R12 220R
R18 220R
C4
1000 pF
J24
RS232
5
9
4
8
3
7
2
6
1
10
11
C14
1000 pF
R9 220R
R11 220R
L4 100 uH
C3
1000 pF
R5 2.2K
C6
1000 pF
R17 220R
C16
1000 pF
J23
ACC
15
10
4
14
9
3
13
8
2
12
7
1
11
6
5
16
17
R21 220R
R7
69.8K 1%
C2
1000 pF
R3 2.2K
C15
1000 pF
C10
1000 pF
R16 220R
R13 220R
R20 220R
R2 220R
R8 2.2K
C7
1000 pF
L3 100 uH
C9
1000 pF
C5
1000 pF
C12
1000 pF
P90
KIO3
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
R14 220R
C13
1000 pF
R6
100K 1%
R19 220R
R4 2.2K
R10 220R
C1
1000 pF
L2 100 uH
C8
1000 pF
C17
1000 pF
R15 220R
W. Burdick
Elecraft
Rev. Sht. DateBy
1 of 1
SA1
J69A
To J7
R1
560K
(ANT1)
10
11
12
13
14
15
16
17
18
19
20
1
2
3
4
5
6
7
8
9
J70
RF Board
L3
C5 C6
KANT3 Ant. Input Module
8.2 MHz Trap
L1
(jumper)
C2
C1 C3
L2
96 nH
C4
3900
R. Friess
NOTES: 1. All parts are through-hole.
2. Adjust L2 and C5 for minimum 8.215-MHz leakthrough.
3. = mounted on bottom side of PCB.
12
J72
*
* Not presently used
*
*
*
**
XC 10/13/08
C:\Projects\K3\Schematics\NOISE BLANKERrevB.sch - Sheet1
2N3904
Q3
1.2K
R9
1.5K
R8
330
R5
C26
0.1
W. Burdick
Elecraft
Rev. Sht. DateBy
1 of 1
V-
V+
1
2
3
4
5
67
8
U3
SA612
C12
0.1
C15 C16
39 33
X2 X3 X4
C14
33
X1
C13
39
C6
0.1
1K
R6
C20
0.1
C19
0.1
GND
OUT
14
5V
VC
NC
1
2
7
8
Z1
11
4
L2
27
CLR
CLK
Vcc
GND
1Q
1Q
1D
2Q
2Q
2D
15
4Q
14
4Q
10
3Q
11
3Q
13 4D
12 3D
16
1
9
2
3
4
7
6
5
8
U2
74VHC175
Divide by 6
/RST
Vdd
Vss 1
2
3
U1
MCP809T-450
12345678
P75
J6
Main RXLO2
C1
0.1
C2
100
C18
39
8
1
K1
D1
2N3904
Q2
R4 J7
8.215 MHz
TXIF1
KREF3 REF/2ND TX IF
330
J1
Sub Ref.
C8
0.1
L5
27
C11
0.1
TX Mixer
L1
27
R2
1K
R1
330
C4
0.1
TXIF2 (15 KHZ)
C22
0.1
L6
27
C3
0.1
C28
0.1
J3
Ext. Ref.
1.2K
R7
C5
0.1
C27
0.1
J2
Main Ref.
C7
0.1
J5
Sub RXLO2
100 HZ
C24
0.1
1N914
R3
15
L4
27
C23
0.1
330
R15
R14 330
330
R11
R10
150
330
R13
R12
150
VCTRL
5V
R17 330 R18 750
C10
0.1
100 HZ
TXMIXFIL
RF Board
2
4
3
7
5
6
K1
R16
68
5V
C21 0.1
MX
XF
7T
IN
2V
5V
7T
Fc = 8215.0 kHz, BW=4 kHz
Fxtal = 8212.5 kHz
CUT
J4-6 to U2-9
49.380
TX MIX OUT
12345678
J4
Ext. Sync. Module
XD 3/3/07
1K
.01
6.8K
C36
R34
R35
.01
C51
.27
C52
10K
R36
C9
R26
0.1
(not used)
L6
50 µH
2N3904
Q3
R21
12
12T, FT37-43
10
11
12
13
14
15
16
17
18
19
20
1
2
3
4
5
6
7
8
9
P73
C11
0.1
C13
0.1
C17
.01
C31
.01
Amp
R23
470
R24
470
FS ADJ
/FSYNC
A Vdd
D Vdd
RESET
SLEEP
SDATA
IOUTB
COMP
DGND
MCLK
FSEL
PSEL
SCLK
SIGN
IOUT
AGND
VREF
CAP
Vin
1011
12
13
14
15
16
17
18
19
20 1
2
3
4
5
6
7
8
9
U2 AD9834
C24
.01
C22.01
R25
200
C25
0.1
C190.1
R22
6.8K
C23
0.1
L9
27 µH
C26
0.1
L5
27 µH
L4
27 µH
C15
0.1
CPGND
DVDD
AVDD
RSET
AGND
DATA
DGND
RFB
RFA
MUX
REF
CLK
CP
VP
LE
10
11
12
13
14
15
16
CE
1
2
3
4
5
6
7
89
U3
ADF4001
DDS
R12
10K
C50 120
5V
ZXCL300E5
GND
N/C
OUT IN
EN
1
2
34
5
U6
W. Burdick
Elecraft
Rev. Sht. DateBy
K3 Synthesizer
DDS
C49
0.1
10 µF
C41
0.1
C39
L7
27 µH
0.1
C38
10 µF
C37
X3
R13
200
PLL
C64
C65
C68
47
10
47
L1L2
39µH
39µH
100K
R17
2N3904
Q6
R20
25.5
1K
R16
3V
L3
27 µH
100
R15
0.1
C47
/CSDDSB
/CSPLLB
MOSI2B
SCK2B
10K
R14
VPLL
1N4148
100K
MMBV109
J310
C33
C28
0.1
R32
R29
D8
Q1
D9
D10
22
10
G
D
S
VCO
C21
0.1
J310
Q2
G
D
S
2.7K
R31
C27 0.1
R27
22
330
R30
0.1
C53
1 of 1
3V
5V
Crystal Filter
8-46 MHz
SCK2B
MOSI2B
B A
D C
E
F
T1
75
6
24
3
K2
75
6
24
3
K1
75
6
24
3
K3
C4
2%
SCK2
/2OE
/3OE
/4OE
/1OE
GND
VCC
2A
4A
3Y
3A
4Y
2Y
10
11
12
13
14
1Y
1A
8
9
1
2
3
4
5
6
7
U7
74LCX125
/CSDDSB
/CSPLLB
MOSI2
MOSI2B
SCK2B
LD_SYN
2N3904
Q5
R10
56.2K
1N5711
D6
MMBD914
D5
C7
.01
R28
1.8K
8B
ALC
C6
1%
110
C5
30
L Select
1KR7
C3
30
D4
BAP64-04
1KR6
C2
15
D3
1KR5
C1
7.5
D2
.01
C45
K1
K2
18
SRCK
SOUT
/CLR
RCK
SIN
VCC
/Q0
/Q1
/Q2
/Q6
/Q4
/Q3
/Q7
/Q5
GND
10
15
11
6
12
14
16
/G
9
2
3
1
4
5
13
7
8
U1
5V
MOSI2
12V
TPIC6C595N
.01
C44
SCK2
LD_SYN
K3
470
R8
8B
+13 DBM
15K
R33
6
57-
+
8
4
U5A
8B
3V
OP284
3
21
+
-
U5B
L8
39 µH
0.1
C12
= On top side of PC board.
0.1
C48
.01
C57
.01
C54 C55 C56
.01
C59
0.1
C58
R38
100K
2.2 uF
C62
2%
12V
X2 X1
C66
12
XB XF
J83
C69
10 µF
J84
VCO Out
49.38 MHz
330
R11
Z = 500
Z = 200
C10
0.1
MISO2
R41
15K
R40
8.2K
0.01
C16
C20
.022
1
3
4+
-
5
2
U4
5V
VPLL
LMV321
VP
R9
75
C14
0.1
CP
X4
C67
10
MISO2
Q4
2N7002
C18
0.1
-6 dB @ +/- 1.2 kHz
8A
0.1
C60
8B
R39
22
C61
470 µF
+
8B
AB
AE
22
C35
C34
47
VCO
8.7-46 MHZ
VCO
LF
3LF
LD
LPF
VT
3V
DT
FS
CSP
CK
VCO
DET
GT
DR
+10 dB
12V
120
C29
120
C30
C71
12
C70
12
1KR18
C8
68
D1
C32
LPF
Fpll = ~22 kHz
MISO2
(1.0 or 0.25 µH,
Pri: 9t #26, bifilar;
Sec: 3t #26)
B,D=Grn
A,C=Red
R37
150
Leaded, 1/4 W
NOT ON REV A PCB
AC
A4 1-8-10
* = Changes (from rev A3 to A4)
*
*
K
K= Keyed connector pin
5
5
4
4
3
3
2
2
1
1
D D
C C
B B
A A
PCB Revision B
NOTES:
2004070601 B,1
Elecraft K3: Front Panel
Elecraft, Inc. Copyright (C) 2007.
L Johnson
A
17Tuesday, November 24, 2009
Title
Size Document Number Rev
Date: Sheet of
LCD
LCD
LCDSCL
LCDDI
LCDCE
LCDMODE
VCONTRAST
POWER
POWER
12V_SW
12V_UNSW
POWERHOLDON
/PWRON
VPWR_SW
V12MON
3VBATT
SDA
SCL
LEDS
LEDS
VLEDBRT
VLCDBKLT
MOSI
SCK
LOAD
MICBIAS
MCU
MCU
LCDSCL
LCDDI
LCDCE
LCDMODE
/PWRON
VCONTRAST
VR1FRONT
VR1REAR
VR2FRONT
VR2REAR
VFPADCMUX
MISCENCMUX
MAINENCB
MAINENCA
VLCDBKLT
VLEDBRT
RITENCA
RITENCB
SUBENCA
SUBENCB
12V_SW
12V_UNSW
VPWR_SW
V12MON
PWRHOLDON
ADR[2:0]
MOSI
SCK
LOAD
VMICBTN
MISO
/PTT
/DSP1BUSY
/DSP2BUSY
VSMTR
/CSDSP1
/CSDSP2
/CSDSPLOAD
3VBATT
MUTE
/ENC_EN
DSP1DATA
DSP2DATA
VFADCTAP
SCL
SDA
SWITCHES
SWITCHES
ADR[2:0]
VFPADCMUX
MISCENCMUX
MAINENCA
MAINENCB
SUBENCA
RITENCA
SUBENCB
RITENCB
/ENC_EN
VFADCTAP
MISCELLANEOUS
MISCELLANEOUS
VR1REAR
VR1FRONT
VR2REAR
VR2FRONT
VMICBTN
/PTTMICBIAS
LCDCE
PWRHOLDON
12V_SW
/PWRON
VCONTRAST
LCDMODE
LOAD
VPWR_SW
LCDDI
LCDSCL
3VBATT
MOSI
VLCDBKLT
VLEDBRT
V12MON
SCK
RITENCB
/DSP2BUSY
/CSDSP1
/ENC_EN
VR1REAR
/PTT
VSMTR
SUBENCB
MOSI
VFPADCMUX
SUBENCA
VR2REAR
DSP2DATA
VR2FRONT
VFADCTAP
VMICBTN
MUTE
ADR[2:0]
SCK
MISO
MISCENCMUX
RITENCA
MAINENCB
DSP1DATA
MAINENCA
/DSP1BUSY
/CSDSPLOAD
/CSDSP2
VR1FRONT
SCL
SDA
MICBIAS
12V_UNSW
J31
FP-DSP
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
5
5
4
4
3
3
2
2
1
1
D D
C C
B B
A A
NOTES:
R54 sets LCD driver current.
R57 sets LCD drive frequency.
LCD pinout is Rev F.
U2 K[0..4] to use separable vias to ground for debug/
development.
PCB Revision B
2004070601 B.1
Elecraft K3: Front Panel - LCD
Elecraft, Inc. Copyright (C) 2007.
L Johnson
B
27Tuesday, November 24, 2009
Title
Size Document Number Rev
Date: Sheet of
COM3
COM4
SEG1
SEG2
SEG3
SEG4
SEG5
SEG6
SEG7
SEG8
SEG9
SEG10
SEG11
SEG12
SEG13
SEG14
SEG15
SEG16
SEG17
SEG18
SEG19
SEG20
SEG21
SEG22
SEG[1..60]
COM1
COM2
COM[1..4]
LCDSCL
LCDDI
LCDCE
LCDMODE
SEG60
SEG59
SEG58
SEG57
SEG56
SEG55
SEG54
SEG53
SEG52
SEG51
SEG50
SEG49
SEG48
SEG47
SEG46
SEG45
SEG44
SEG43
SEG42
SEG41
SEG40
SEG39
SEG38
SEG37
SEG36
SEG35
SEG34
SEG33
SEG32
SEG31
SEG30
SEG29
SEG28
SEG27
SEG26
SEG25
SEG24
SEG23
SEG22
SEG21
SEG20
SEG19
SEG18
SEG17
SEG16
SEG15
SEG14
SEG13
SEG12
SEG11
SEG10
SEG9
SEG8
SEG7
SEG6
SEG5
SEG4
SEG3
SEG2
SEG1
SEG28
SEG29
SEG32
SEG24
SEG26
SEG30
SEG31
SEG25
SEG23
SEG33
SEG27
SEG41
SEG34
SEG40
SEG47
SEG36
SEG39
SEG38
SEG44
SEG42
SEG46
SEG35
SEG43
SEG45
SEG37
SEG50
SEG49
SEG48
SEG51
SEG55
SEG52
SEG54
SEG53
SEG59
SEG58
SEG57
SEG56
SEG60
COM2
COM4
COM3
COM1
LCDDI
LCDCE
LCDSCL
LCDMODE
VCC5
VCC5
VCC5
J36
OLED
1
2
3
4
5
6
R20 100K
D15
BAT54
13
R13
1K
DS1
K3 Custom LCD
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
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
4
3
2
1
SEG1
SEG2
SEG3
SEG4
SEG5
SEG6
SEG7
SEG8
SEG9
SEG10
SEG11
SEG12
SEG13
SEG14
SEG15
SEG16
SEG17
SEG18
SEG19
SEG20
SEG21
SEG22
SEG23
SEG24
SEG25
SEG26
SEG27
SEG28
SEG29
SEG30
SEG31
SEG32
SEG33
SEG34
SEG35
SEG36
SEG37
SEG38
SEG39
SEG40
SEG41
SEG42
SEG43
SEG44
SEG45
SEG46
SEG47
SEG48
SEG49
SEG50
SEG51
SEG52
SEG53
SEG54
SEG55
SEG56
SEG57
SEG58
SEG59
SEG60
COM1
COM2
COM3
COM4
+
C38
10 uF/25V
R16
10K0
L
U2
NJU6436
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
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
64
65
66
67
68
69
70
71
72
73
74
77
78
79
81
82
83
84
85
86
87
88
89
90
91
92
93
94
97
98
99
100
SEG1
SEG2
SEG3
SEG4
SEG5
SEG6
SEG7
SEG8
SEG9
SEG10
SEG11
SEG12
SEG13
SEG14
SEG15
SEG16
SEG17
SEG18
SEG19
SEG20
SEG21
SEG22
SEG23
SEG24
SEG25
SEG26
SEG27
SEG28
SEG29
SEG30
SEG31
SEG32
SEG33
SEG34
SEG35
SEG36
SEG37
SEG38
SEG39
SEG40
SEG41
SEG42
SEG43
SEG44
SEG45
SEG46
SEG47
SEG48
SEG49
SEG50
SEG51
SEG52
SEG53
SEG54
SEG55
SEG56
SEG57
SEG58
SEG59
SEG60
S0
S1
S2
S3
S4
S5
K0
K1
K2
K3
K4
REMIN
OSC1
OSC2
VDD
INH
CE
SCL
DI
DO
MODE
REQ1
REQ2
RESET
VSS
LED
VLCD
BIAS
COM4
COM3
COM2
COM1
C41
0.1 uF
D14
BAT54
13
+
C32
10 uF/25V
R23
1K00
LCDSCL
LCDDI
LCDCE
LCDMODE
VCONTRAST
5
5
4
4
3
3
2
2
1
1
D D
C C
B B
A A
NOTES:
PCB Revision B
2004070601 B.1
Elecraft K3: Front Panel - LEDs
Elecraft, Inc. Copyright (C) 2007.
L Johnson
B
37Tuesday, November 24, 2009
Title
Size Document Number Rev
Date: Sheet of
MOSI
VLCDBKLT
SCK
LOAD
VLEDBRT
MICBIAS
VCC5VCC5
VCC5
VCC8
R62 120R
R64 120R
R35 120R
U14
TPIC6C595D
3
4
5
6
11
12
13
14
9
2
15
7
10
8
1
16
Q0
Q1
Q2
Q3
Q4
Q5
Q6
Q7
SDO
SDI
SCK
SCLR
RCK
OE
VCC
GND
D8
SPEED (GRN)
21 R53 120R
R54 120R
D3
SHIFT (GRN)
21
C63
0.1 uF
D13
OFS + (YEL)
21
D10
COM OUT (GRN)
21
R33 120R
U13
TPIC6C595D
3
4
5
6
11
12
13
14
9
2
15
7
10
8
1
16
Q0
Q1
Q2
Q3
Q4
Q5
Q6
Q7
SDO
SDI
SCK
SCLR
RCK
OE
VCC
GND
R37 120R
D9
COM IN (GRN)
21
D4
LO (GRN)
21
D12
OFS - (YEL)
21
R32 120R
R36 120R
D5
HI (GRN)
21
D1
TX (RED)
21
D11
PWR (GRN)
21
R3
12R
R63 120R
Q4
FMMT614TA
2
1
3
R31 1K00
C62
0.1 uF
R34 120R
D6
WIDTH (GRN)
21
R61 120R
D2
D-F (YEL)
21
R67 120R
D7
OFS CLR (GRN)
21
Z8
LCD BACKLIGHT
21
VLCDBKLT
MOSI
SCK
LOAD
VLEDBRT
MICBIAS
5
5
4
4
3
3
2
2
1
1
D D
C C
B B
A A
NOTES:
PCB Revision B
2004070601 B.1
Elecraft K3: Front Panel - MCU
Elecraft, Inc. Copyright (C) 2007.
L Johnson
B
47Tuesday, November 24, 2009
Title
Size Document Number Rev
Date: Sheet of
RXD
PGC
PWRHOLDON
SDA
ADR1
PGD
/CSDSP1
LOAD
MISO
FCOUNT
EXP_FP1
VMICBTN ADR3
/CSRFMUX
MOSI
T5
R5
ADR0
ADR2
MCLR
VSMTR
TXD
PGD
PGC
/SR_EN
AUXBUS
ENC_EN
/PTT
/DOT
ADR[2:0]
SCK
/PTT
FCOUNT
/DOT
/DASH
/KEY
RXD
MOSI
SCK
/CSEEP
/CSDSP2
/CSDSPLOAD
/DOT
/PTT
/DASH
/KEY/KEYB
/ENC_EN
/KEY
/DASH
3VBATT
12V_SW
/PWRON
12V_UNSW
3VBATT
12V_UNSW
12V_SW
/PWRON
FCOUNT
VLEDBRT
AUXBUS_RAW
AUXBUS
/SR_EN
/SR_EN
SUBENCA
RITENCA
RITENCB
SUBENCB
MAINENCB
MAINENCA
T5
ADR0
/CSRFMUX
R5
SCK
ADR2
ADR3
ADR1
ADR2
ADR1
ADR0
/CSRFMUX
ADR3
R5
/SPI23_EN
T5
VRFADCMUX
MOSI
SCK
MISO
MOSI
MISO
/CSEEP
MISCENCMUX
MUTE
DIG1
DIG0
NB1AGC
DIG1
DIG0
NB1AGC
DIG1
DIG0
NB1AGC
/SPI23_EN
/SPI23_EN
VRFADCMUX
VFPADCMUX
VRFADCMUX
VR2FRONT
VPWR_SW
VR1FRONT
VR2REAR
VR1REAR
VLCDBKLT
VCONTRAST
V12MON
LCDMODE
LCDDILCDSCL
LCDCE
/DSP1BUSY
/DSP2BUSY
DSP2DATA
DSP1DATA
VFADCTAP
RXD
TXDQ
MCLR
TXD
TXDQ
TXD
MISO
MOSI
SCK
/CSFLASH
FPTMP
/CSFLASH
MISO
SCK
MISO
MOSI
/DSP2BUSY
DSP2DATA
SCL
EXP_FP1
FPTMP
VCC5A
VCC5
VCC5VCC5
VCC5A
VCC5
VCC5
VCC3
VCC3
VCC5
VCC3
VCC3
VCC5
VCC5
VCC5
VCC5
VCC5
VCC5
VCC5
VCC5
VCC5
C9
0.1 uF
R44
10K0
C86 1000 pF
R56 120R
C88 1000 pF
R80 120R
U5
M25P20
1
2
3 4
5
6
7
8
CS
SO
WP VSS
SI
SCK
HOLD
VCC
C20 0.01 uF
SC
Q5
2N7002K
1
32
C81
1000 pF
R76 47K0
C1
0.1 uF
C90
1000 pF
C10
470 pF
U6
SN74HCT125A
1
2
7
3
14
5
4
6
9
10
12
13
8
11
1OE
1A
GND
1Y
VCC
2A
2OE
2Y
3A
3OE
4A
4OE
3Y
4Y
R81 120R
J3
ICD-2
1
2
3
4
5
6
C85 1000 pF
R73 120R
C82 0.01 uF
J35
FP EXPAND
1
2
3
4
5
C83 0.01 uF
C70 1000 pF
R6 47K0
C96
1000 pF
C4
0.1 uF
C94 0.01 uF
R19
4K70
R83
47K0
R71 2K20
U8
AT25256A
1
2
3 4
5
6
7
8
CS
SO
WP VSS
SI
SCK
HOLD
VCC
C84 1000 pF
C18 0.01 uF
R75 47K0
C19 0.01 uF
U7
SN74LVC125A
1
2
7
3
14
5
4
6
9
10
12
13
8
11
1OE
1A
GND
1Y
VCC
2A
2OE
2Y
3A
3OE
4A
4OE
3Y
4Y
C11
1000 pF
R28 100K
C6
0.1 uF C14 1000 pF
R72 2K20
C7
15 pF
U15
LM20CIM7
1
2
34
5NC
GND
VOV+
GND
C93 1000 pF
Y2
16 MHz
R82 10K0
R70 2K20
C3
0.1 uF C91
470 pF
L7 100 uH
R77 47K0
C2
0.1 uF
R5 330R
MO
C17 1000 pF
R55 120R
R74 47K0
C12
1000 pF
C15 1000 pF
C13 1000 pF
C8
15 pF
C79 0.01 uF
C35
0.1 uF
D16
BAT54
1 3
C87 1000 pF
R69 2K20
MI
U1
PIC18LF8722
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
32
33
34
35
36
37
38
39
40 41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
RH2/A18
RH3/A19
RE1/WR/AD9
RE0/RD/AD8
RG0/CCP3
RG1/TX2/CK2
RG2/RX2/DT2
RG3/CCP4
MCLR
RG4/CCP5
VSS
VDD
RF7/SS
RF6/AN11
RF5/AN10/CVref
RF4/AN9
RF3/AN8
RF2/AN7/C!OUT
RH7/AN15
RH6/AN14
RH5/AN13
RH4/AN12
RF1/AN6/C2OUT
RF0/AN5
AVDD
AVSS
RA3/AN3/VREF+
RA2/AN2/VREF-
RA1/AN1
RA0/AN0
VSS
VDD
RA5/AN4/LVDIN
RA4/TOCKI
RC1/T1OSI/CCP2
RC0/T1OSO/T13CKI
RC6/TX1/CK1
RC7/RX1/DT1
RJ4/BA0
RJ5/CE RJ6/LB
RJ7/UB
RC2/CCP1
RC3/SCK/SCL
RC4/SDI/SDA
RC5/SDO
RB7/KBI3/PGD
VDD
OSC1/CLKI
OSC2/CLK0/RA6
VSS
RB6/KBI2/PGC
RB5/KBI1/PGM
RB4/KBI0
RB3/INT3/CCP2
RB2/INT2
RB1/INT1
RB0/INT0
RJ3/WRH
RJ2/WRL
RJ1/OE
RJ0/ALE
RD7/PSP7/AD7
RD6/PSP6/AD6
RD5/PSP5/AD5
RD4/PSP4/AD4
RD3/PSP3/AD3
RD2/PSP2/AD2
RD1/PSP1/AD1
VSS
VDD
RD0/PSP0/AD0
RE7/CCP2/AD15
RE6/AD14
RE5/AD13
RE4/AD12
RE3/AD11
RE2/CS/AD10
RH0/A16
RH1/A17
C92 1000 pF
R4 100R
R29 100K
+
C5
10 uF/25V
J30
RF BOARD
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
C16 1000 pF C80 0.01 uF
C21 0.01 uF
C89
1000 pF
VR1REAR
VR2FRONT
VFPADCMUX
MISCENCMUX
MAINENCB
MAINENCA
RITENCA
RITENCB
SUBENCA
SUBENCB
VPWR_SW
PWRHOLDON
ADR[2:0]
MOSI
SCK
LOAD
VMICBTN
MISO
/CSDSP1
/CSDSP2
/CSDSPLOAD
VSMTR
/PTT
/ENC_EN
/PWRON
12V_UNSW
3VBATT
12V_SW
VCONTRAST
VLEDBRT
MUTE
VR1FRONT
VR2REAR
VLCDBKLT
V12MON
LCDMODE
LCDSCL
LCDCE
LCDDI
/DSP1BUSY
/DSP2BUSY
DSP2DATA
DSP1DATA
VFADCTAP
SCL
SDA
5
5
4
4
3
3
2
2
1
1
D D
C C
B B
A A
NOTES:
Controls are dual pots.
REAR (INNER) LOWER POT
FRONT (OUTER) LOWER POT
PCB Revision B
REAR (INNER) UPPER POT
FRONT (OUTER) UPPER POT
2004070601 B.1
Elecraft K3: Front Panel - Miscellaneous
Elecraft, Inc. Copyright (C) 2007.
L Johnson
A
57Tuesday, November 24, 2009
Title
Size Document Number Rev
Date: Sheet of
/PTT
UP
BIAS
DN
VMICBTN
VR1REAR
VR1FRONT
VR2REAR
VR2FRONT
FUNC
AF
VCC5B
VCC5B
VCC5B
VCC5B
VCC5B
R52
1K00
TAIL7
C76 0.01 uF
C64 0.01 uF
TAIL8
FIDCL2
STNDO8
C45
0.01 uF
CNR1
STNDO1
L5 100 uH
TAIL11
J2
MIC
1
2
3
4
5
6
7
8
R87 10K0
R2 10K
1
2
3
4
5
6
7
8
9
C78 0.01 uF
TAIL9
C75 0.01 uF
C58 0.01 uF
FIDCL1
STNDO6
C47
0.01 uF
HOLE1
R51
1K00
STNDO7
C98
1 uF
TAIL14
C44
0.01 uF
PHONES
R49
1K00
CNR3
L3 100 uH
STNDO2
STNDO4
TAIL10
L9 100 uH
R89
5K60
HOLE2
C71 0.01 uF
C95 0.01 uF
TAIL3
CNR4
C43
0.01 uF
TAIL12
R88 10K0
L2 100 uH
TAIL2
C67 0.01 uF
L8 100 uH
C97
1 uF
TAIL4
C66 0.01 uF
R1 10K
1
2
3
4
5
6
7
8
9
CNR2
STNDO3
C74 0.01 uF
R50
1K00
TAIL13
MICGND
C65 0.01 uF
TAIL6
C46
0.01 uF
TAIL5
TAIL1
Q8
MMBT3906
1
23
L6 100 uH
STNDO5
C72 0.01 uF
J32
DSP MIC AUDIO
1
2
3
4
5
R48
1K00
VR1REAR
VR1FRONT
VR2FRONT
/PTT
VMICBTN
VR2REAR
MICBIAS
5
5
4
4
3
3
2
2
1
1
D D
C C
B B
A A
Regulators U3 and U5 SOT-223.
NOTES:
PCB Revision B
L1 occupies site
labeled R68.
2004070601 B.1
Elecraft K3: Front Panel - Power and RTC
Elecraft, Inc. Copyright (C) 2007.
L Johnson
B
67Tuesday, November 24, 2009
Title
Size Document Number Rev
Date: Sheet of
VPWR_SW
V12MON
12V_SW
VCC5CLK
SDA
SCL
VCC8
VCC5
VCC5B
VCC3VCC5
VCC5
C77
0.1 uF
C50
0.1 uF
R86
10K0
U11
74AHC1GU04
24
53
C61
0.1 uF
Q6
2N7002K
1
32
R85
10K0
+
C59
470 uF/25V
S18
POWER
R43 30K0
C51
0.1 uF
U9
LM2937IMP-8.0
1
2 4
3
+VIN
GND TAB
OUT
+
C57
10 uF/25V
C53
0.1 uF D17
BAT54C
1 3
2
Q2
2N7002K
1
32
C60
33 pF
TP1
GND
1
2
TP2
GND
1
2
C40
0.1 uF
R38
10K0
C42
0.1 uF
Q3
2N7002K
1
32
U4
LP2985-3.3
1
2
3
4
5
VIN
GND
Enable
Bypass
OUT
+
C73
470 uF/25V
R45
100K
C37
10 uF 10v ECJ
R24
10K0
C55
0.1 uF
R26
30K0
+
C52
1000 uF/10V
U10
UA78M05
1
2 4
3
+VIN
GND TAB
OUT
L1 (R68)
2.2 mH
U16
PCF8563T
1
2
3
4
5
6
7
8
OSCI
OSCO
INT
VSS
SDA
SCL
CLKOUT
VDD
R84 100R
Y1
32 kHz
+
C48
10 uF/25V
R25
10K0
12V_SW
12V_UNSW
POWERHOLDON
/PWRON
VPWR_SW
V12MON
3VBATT
SCL
SDA
5
5
4
4
3
3
2
2
1
1
D D
C C
B B
A A
NOTES:
PCB Revision B
2004070601 B.1
Elecraft K3: Front Panel - Switches
Elecraft, Inc. Copyright (C) 2007.
L Johnson
B
77Tuesday, November 24, 2009
Title
Size Document Number Rev
Date: Sheet of
SCANADC0
SCANADC1
SCANADC2
SCANADC3
SCANADC4
SCANADC4
TAP7TAP5TAP3TAP2 TAP4 TAP6TAP1
ADR0
ADR1
ADR2
SCANADC5
SCANADC5
SCANADC1
SCANADC5
SCANADC2
SCANADC4
SCANADC0
SCANADC3
SCANADC3
SCANADC1
SCANADC0
SCANADC5
SCANADC2
SCANADC4
SCANADC1
SCANADC2
SCANADC4
SCANADC0
SCANADC3
SCANADC1
SCANADC0
SCANADC2
SCANADC4
MAINENCA
SUBENCB
RITENCA
RITENCB
ADR[2:0]
SCANADC3
SCANADC1
SCANADC0
SCANADC6
SCANADC2
SCANADC5
SCANADC7
SCANADC4
SCANADC2
SCANADC3
SCANADC7
SCANADC6
SCANADC4
SCANADC2
SCANADC3
SCANADC0
SCANADC7
SCANADC1
SCANADC6
SCANADC5
SCANADC1
SCANADC3
SCANADC2
SCANADC0
SCANADC0
SCANADC1
SCANADC5
SCANADC0
SCANADC7
SCANADC6
SCANADC5
SCANADC4
SCANADC3
SCANADC2
SCANADC1
/ENC_EN
ADR2
ADR1
ADR0
MISCENCMUX
TAP1
TAP2
TAP3
TAP4
TAP5
TAP6
TAP7
TAP7
VFADCTAP
SUBENCA
MAINENCB
VFPADCMUX
VCC5
VCC5
VCC5
VCC5
VCC5
VCC5
VCC5
VCC5
VCC5
S24
M3 R66 10K0
R7 100K
S1B
BAND+
C26
0.01 uF
Q1
MMBT3904
1
2
3
R9
1K00
S9
M>V
C56
0.1 uF
S1A
BAND-
R41 10K0
R14 100K
S16
M2
C23 1000 pF
Z4 PWR
12
3
45
6 7
ACOM
B
SWSWCOM
MTG1 MTG2
S27
SPOT
S14
XFIL
J34
SUB ENC Z6 1
2
3
4
5
S31
XIT
C28 1000 pF
S11
ATUTUNE
S7
A>B
S25
M4
S3
MENU
Z1 SHIFT
12
3
45
6 7
ACOM
B
SWSWCOM
MTG1 MTG2
R39
1K00
C69
0.01 uF
C30 1000 pF
S2A
MODE-
R12
1K00
C33
0.1 uF
R60 10K0
R8 100K
S32
FINE
R57
1K00
C27 1000 pF
R78 10K0
V
S8
V>M
S13
AGC
S6
REV
S20
ANT
R42
1K00
S5
A/B
C34
0.01 uF
S12
PRE
S17
REC
S2B
MODE+
S34
RATE
R15
1K00
S30
RIT
Z2 WIDTH
12
3
45
6 7
ACOM
B
SWSWCOM
MTG1 MTG2
R27 100K
R59 10K0
R11 100K
S23
NOTCH
C36
0.01 uF
C54
0.01 uF
R40 10K0
R22 100K
C39
1000 pF
C22 1000 pF
R79 10K0
R21
1K00
C31 1000 pF
R58
3K00
U3
CD74HC4051M
13
14
15
12
1
5
2
4
6
11
10
9
3
7
8
16
X0
X1
X2
X3
X4
X5
X6
X7
INH
A
B
C
X
VEE
VSS
VDD
S28
CWT
S33
CLR
C68
0.01 uF
C49
0.01 uF
S10
XMIT
S4
DISP
S26
FREQ ENT
R17
1K00
S15
M1
S29
AFX
R46 10K0
R65 10K0
R10 100K
S19
RX ANT
U12
CD74HC4051M
13
14
15
12
1
5
2
4
6
11
10
9
3
7
8
16
X0
X1
X2
X3
X4
X5
X6
X7
INH
A
B
C
X
VEE
VSS
VDD
Z3 SPEED
12
3
45
6 7
ACOM
B
SWSWCOM
MTG1 MTG2
S
S35
SUB
R47 10K0
R30 100K
C24 1000 pF
C25
0.01 uF
S21
NB
C29 1000 pF
S22
NR
Z7
OFFSET
13
2
ACOM
B
J33
MAIN ENC Z5 1
2
3
4
5
Q7
MMBT3904
1
2
3
R18
1K00
ADR[2:0]
VFPADCMUX
MAINENCA
MAINENCB
SUBENCA
RITENCA
SUBENCB
RITENCB
/ENC_EN
MISCENCMUX
VFADCTAP
5
5
4
4
3
3
2
2
1
1
D D
C C
B B
A A
PCB Revision C
NOTES:
2004051101 C
K3 DSP: Top Level
Elecraft, Inc. Copyright (C) 2007 - 2010.
L Johnson
B
19Wednesday, June 16, 2010
Title
Size Document Number Rev
Date: Sheet of
MISC
MISC
/ENDVR
MMOSI
MSCK
/DVRCS
CMD
MMISO
RX1_IF+
RX1_IF-
VFWD
VREF
HAGC1
BK_PH_SW
ALC
LINE_IN-
LINE_IN+
BK_MICAF-
BK_MICAF+
MICIN
TXIFI
TXIFQ
VIFGAIN1
SPKR_L
SPKR_R
LINEOUT_R
LINEOUT_L
PHONES_L
PHONES_R
/RST2
MICBIAS
SMOSI
SSCK
/CSDSP1A
DIG0A
MUTEA
100HZA
/CSDSP2A
SMISO
/DSP1BUSYA
/RST
/MISOEN
/RST5
/SPIBOOT2
PCMDSP2
LRCLKPCM1804
CLK3MHZ
AICBCLK
FX2
/ENC2
/AUXDETECT
VSMETER2
RX2_BIF-
RX2_BIF+
DX2
PH_SW
PRGEXP
DSP2DATA
DSP1DATAA
MOSI
SCK
/CSDSPLOAD
VSMETER
CTDOB
/ENC1
AUXD0
AUXD1
DAC AUDIO
AUDIO
SPKR_L
SPKR_R
LHPOUT
RHPOUT
MUTE1
LOUT
ROUT
LINEOUT_L
LINEOUT_R
PHONES_L
PHONES_R
UP
HPCLK
RX IF BUFFER
RX IF BUFFER
RX1_IF-
RX1_IF+
RX1_BIF-
RX1_BIF+
Linear Power
Linear Power
+12V MICBIAS
TXDAC
TXDAC
AICBCLK
DSPDX0
MMOSI
/TXDACCS
MSCK
TCLK0
LRCLKDAC
TXIFI
TXIFQ
DSP
DSP
TCLK0
/DSP1BUSYA
/AICCS
DSPDX0
MSCK
SMISO
SSCK
MMISO
MMOSI
SMOSI
/SPIBOOT2
/DSPRST2
/CSDSP1
/CSDSPLOAD
/DVRCS
/ADCCS
/DACCS
MUTE
CMD
LRCLKPCM1804
CLK3MHZ
/RST
100HZ
AICADC
PCMADC
AUXDSPDX
AICBCLK
LRCLKAIC23
MUTE1
HPCLK
UP
AUXDSPFSX
/MISOEN
/CSDSP2
SCK
MOSI
/RST5
MICS[2..0]
DIG0A
/ENC2
PCMDSP2
/ENDVR
PRGEXP
DSP2DATA
LRCLKDAC
/TXDACCS
DSP1DATAA
CTDOB
/ENC1
LRCLKLIN
/LINCS
AUXD0
AUXD1
CODECS
CODECS
DSPDX0
MMOSI
MSCK
/AICCS
RX1_BIF+
RX1_BIF-
RX2_BIF+
RX2_BIF-
LHPOUT
RHPOUT
AICADC
AICBCLK
LRCLKPCM1804
CLK3MHZ
PCMADC
TCLK0
/RST
LRCLKAIC23
ROUT
LOUT
LINE_IN-
BK_MICAF+
BK_MICAF-
LINE_IN+
MICIN
MICS[2..0]
LRCLKLIN
/LINCS
ANALOG INTERFACE
ANALOG INTERFACE
MSCK
MMISO
MMOSI
nADCS
VIFGAIN1
nDACS
VFWD
ALC
VREF
HAGC1
VSMETER2
VSMETER
BK_PH_SW
PH_SW
/AUXDSPDET
SPKR_R
RX1_IF+
RX1_IF-
VSMTR
/ADCCS
MSCK
MUTEA
MMOSI
/DACCS
CMD
/DVRCS
100HZA
/CSDSP1A
MMISO
SSCK
SMOSI
/DSP1BUSYA
SMISO
/CSDSP2A
/RST2
/SPIBOOT2
FSX2
DX2
BK_PH_SW
LHPOUT
LINEOUT_L
ROUT
PHONES_R
LOUT
PHONES_L
UP
RHPOUT
MICBIAS
MUTE1
HPCLK
HAGC1
SCK
MOSI
/CSDSPLOAD
/RST
/RST5
DIG0A
LINE_IN+
LRCLKPCM1804
RX1_BIF+
/RST
AICADC
PCMADC
MMOSI
LHPOUT
LRCLKAIC23
AICBCLK
RX1_BIF-
MICS[2..0]
LOUT
RHPOUT
DSPDX0
TCLK0
CLK3MHZ
ROUT MSCK
BK_MICAF-
/AICCS
DSP1DATAA
TXIFQ
TCLK0
AICBCLK
/TXDACCS
MSCK
MMOSI
/ENC2
PCMDSP2
/ENDVR
PRGEXP
DSP2DATA
/MISOEN
TXIFQ
TXIFI
TXIFI
MICBIAS
LINEOUT_R
LINEOUT_R
LINEOUT_L
PHONES_L
SPKR_L
SPKR_R
PHONES_R
SPKR_R
SPKR_L
BK_PH_SW
/AUXDETECT
/AUXDETECT
ALC
ALC
VREF
VREF
VFWD
VFWD
HAGC1
VSMETER2
VSMETER2
VSMTR
VIFGAIN1
VIFGAIN1
BK_MICAF+
LINE_IN-
MICIN
RX2_BIF-
RX2_BIF+
BK_MICAF-
BK_MICAF+
LINE_IN-
LINE_IN+
MICIN
RX2_BIF-
RX2_BIF+
RX1_IF+
RX1_IF-
MMISO
MSCK
MMOSI
LRCLKPCM1804
AICBCLK
CLK3MHZ CTDOB
/ENC1
PH_SW
PH_SW
SPKR_R
LRCLKDAC
LRCLKLIN
/LINCS
DSPDX0
AUXD0
AUXD1 +12V
5
5
4
4
3
3
2
2
1
1
D D
C C
B B
A A
NOTES:
PCB Revision C
2004051101 C
K3 DSP: Analog Interface
Elecraft, Inc. Copyright (C) 2007 - 2010.
L Johnson
A
29Wednesday, June 16, 2010
Title
Size Document Number Rev
Date: Sheet of
HAGC1
BK_PH_SW
/AUXDSPDET
PH_SW
MSCK
MMOSI
nDACS
VIFGAIN1
PH_SW
/AUXDSPDET
BK_PH_SW
ALC
VFWD
VREF
MMOSI
MMISO
MSCK
nADCS
SPKR_R
VSMETER
VCC3A
VCC2
VCC3
VCC3
VCC3
R11
100K
R30 10K
U8
ADC78H90CIMT
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
CS
AVDD
AGND
AIN1
AIN2
AIN3
AIN4
AIN5
AIN6
AIN7
AIN8
DGND
DVDD
DIN
DOUT
SCLK
R71 100R R10 100K
R29 10K
D1
BAT54C
1 3
2
C17
0.1 uF
D2
BAT54C
1 3
2R50
10K
U18
AD5302A
1
2
3
4
5
67
8
9
10
LDAC
VDD
VREFB
VREFA
VOUTA
VOUTBSYNC
SCLK
DIN
GND
R28 10K
C14
0.1 uF
C106
0.01 uF
MSCK
MMISO
MMOSI
nADCS
VFWD
ALC
VREF
HAGC1
VSMETER
BK_PH_SW
PH_SW
/AUXDSPDET
VIFGAIN1
nDACS
VSMETER2
SPKR_R
5
5
4
4
3
3
2
2
1
1
D D
C C
B B
A A
NOTES:
PCB Revision C
2004051101 C
K3 DSP: DAC Audio
Elecraft, Inc. Copyright (C) 2007 - 2010.
L Johnson
B
39Wednesday, June 16, 2010
Title
Size Document Number Rev
Date: Sheet of
+12V
VCC5A
VCC8AVCC8A
VCC8AVCC8A
+
C15 10 uF/25V
+
C9 100 uF/6.3V
R66
10.5K 1%
C116
1500 pF 5% C0G
C11 470 pF
C16 0.47 uF
C10 0.47 uF
R68
34.0K 1%
C113
0.015 uF 5% X7R
C2 0.47 uF
+
-
U30B
TLC2274
5
6
7
411
R67
60.4K 1%
C1 470 pF
R63
60.4K 1%
C110
1000 pF 5% C0G
C112
1500 pF 5% C0G
C7
0.1 uF
C114
1000 pF 5% C0G
C8
3.3 uF
U2
LM4811MM
2
7
1
4
5
10
9
3
8
6
INA
SHUTDOWN
OUTA
CLK
GND
VDD
OUTB
BYPASS
INB
UP/DN
R6 2.7R
+
C13 100 uF/6.3V
+
C18 10 uF/25V
R69
10.5K 1%
R2 20K
R8 100K
C115
1000 pF 5% C0G
C109
0.015 uF 5% X7R
R65
10.5K 1%
C3 0.1 uF
+
-
U30A
TLC2274
3
2
1
411
+
-
U30C
TLC2274
10
9
8
411
R1 100K
+
C22
10 uF/25V
+
-
U30D
TLC2274
12
13
14
411
C19 0.47 uF
R9 20K
C111
1000 pF 5% C0G
+
C4
1 uF/25V
R3 2.7R
C6 0.1 uF
R70
10.5K 1%
R64
34.0K 1%
U1
LM4950TS
1
2
3
4
5 6
7
8
9
10
INA
SHUTDOWN
OUTA
GND
GND VDD
OUTB
BYPASS
INB
TAB
SPKR_L
SPKR_R
LHPOUT
MUTE1
LOUT LINEOUT_L
LINEOUT_R
PHONES_L
PHONES_R
UP
HPCLK
RHPOUT
ROUT
5
5
4
4
3
3
2
2
1
1
D D
C C
B B
A A
NOTES:
PCB Revision C
2004051101 C
K3 DSP: CODECS
Elecraft, Inc. Copyright (C) 2007 - 2010.
L Johnson
B
49Wednesday, June 16, 2010
Title
Size Document Number Rev
Date: Sheet of
LRCLKPCM1804
CLK3MHZ
DSPDX0
AICADC
PCMADC
TCLK0
/RST
MMOSI
MSCK
/AICCS
VMID
RX1_BIF+
RX1_BIF-
RX2_BIF+
RX2_BIF_
RHPOUT
LHPOUT
LRCLKAIC23
AICBCLK
TCLK0
MICIN
BK_MICAF-
BK_MICAF+
LINE_IN-
LINE_IN+
MICS0
MICS1
MICS2
MICS[2..0]
LRCLKAIC23
AICADC
RHPOUT
LHPOUT
RLINEIN
LLINEIN
MSCK
MMOSI
/LINCS
TCLK0
AICBCLK
DSPDX0
VMIDL
ROUT
LOUT
LRCLKLIN
VCC3
VCC3VCC5A
VCC3A
VCC3
VCC3
VCC8A
VCC8A
VCC8A
VCC8A
VCC5A
VCC3A
VCC3
VCC3A
VCC3
LHPOUT
+
-
U5B
LM833D
5
6
7
84
R24 10K
R14 10K
U4
74HCT4053M
1
2
3
45
6 7
8
9
10
11
12
13
14
15
16
Y1
Y0
Z1
ZZ0
INH VEE
GND
ZC
YC
XC
X0
X1
X
Y
VCC
U23
PCM1804DB
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
VrefL
AgndL
VcomL
VinL
VinL
FMT0
FMT1
S/M
OSR0
OSR1
OSR2
BYPAS
DGND
VDD
DATA/DSDL
BCK/DSDL
LRCK/DSDBCK
SCKI
RST
OVFR
OVFL
VCC
AGND
VinR
VinR
VcomR
AgndR
VrefR
C42
0.1 uF
C33
1 uF
R27
2.2K
C80
0.1 uF
R23 10K
R13 10K
C45 1 uF
AICADC
C44 1 uF
C36
1 uF
+
-
U5A
LM833D
3
2
1
84
+
C47
10 uF/25V
C34
1 uF
C30 100 pF
C28
1 uF
C89
0.1 uF
U7
TLV320AIC23B
20
19
1
11
23
24
21
22
27
28
6
4
5
3
25
7
2
8
15
14
18
17
9
10
16 26
12
13
LLINEIN
RLINEIN
BVDD
HPGND
SDIN
SCLK
CS
MODE
DVDD
DVSS
DOUT
DIN
LRCIN
BCLK
XTI/MCLK
LRCOUT
CLKOUT
HPVDD
AVSS
AVDD
MCIN
MCBIAS
LHPOUT
RHPOUT
VMID XTO
LOUT
ROUT
C31
0.1 uF
R20 10K
C108
0.1 uF
+
-
U6A
LM833D
3
2
1
84
+
-
U6B
LM833D
5
6
7
84
U29
TLV320DAC23
1
11
23
24
21
22
27
28
4
5
3
25
2
8
15
14
9
10
16 26
12
13
BVDD
HPGND
SDIN
SCLK
CS
MODE
DVDD
DVSS
DIN
LRCIN
BCLK
XTI/MCLK
CLKOUT
HPVDD
AVSS
AVDD
LHPOUT
RHPOUT
VMID XTO
LOUT
ROUT
R25
10K
C43 100 pF
R26 10K
R16 10K
RHPOUT
C107
10 uF 10v ECJ
C48
0.1 uF
C41
0.1 uF
R17 10K
R18 10K
R21 49.9K
+
C40
10 uF/25V
R22
2.2K
R15 100K
LRCLKAIC
C37
1 uF
C32 100 pF
R19
10K
DSPDX0
MMOSI
MSCK
/AICCS
RX1_BIF+
RX1_BIF-
RX2_BIF+
RX2_BIF-
LHPOUT
RHPOUT
AICADC
AICBCLK
LRCLKPCM1804
CLK3MHZ
PCMADC
TCLK0
/RST
LRCLKAIC23
MICIN
BK_MICAF+
BK_MICAF-
LINE_IN+
LINE_IN-
MICS[2..0]
LOUT
ROUT
LRCLKLIN
/LINCS
5
5
4
4
3
3
2
2
1
1
D D
C C
B B
A A
NOTES:
PCB Revision C
2004051101 C
K3 DSP: DSP AND LOGIC
Elecraft, Inc. Copyright (C) 2007 - 2010.
L Johnson
B
59Wednesday, June 16, 2010
Title
Size Document Number Rev
Date: Sheet of
TRST
DSP1DATAA
EMU0
TMS
TDI
TCK
TDO
/DSP1BUSYA
EMU1
/INT1
/INT0
/HOLD
/SHZ
/INT3
/INT2
/RSTDSP
A14
A11
D5
/PAGE1
A9
D3
A8
D15
A2
A12
A0
/PAGE0
D11
A4
/INT3
D2
D6
A17
/RDY
A6
D4
A13
A10
D14
D1
D10
/INT2
D7
A16
/HOLD
A5
D13
D9
/WR
A18
/INT1
A3
D0
/INT0
D12
A15
D8
A7
A1
A14
A12
A6
A9
A11
A13
A3
A0
A7
A16
A4
A5
A15
A8
A1
A2
A10
D2
D7
D4
D0
D3
D5
D1
D6
DSPFSR0
TCLK0
AICBCLK
DSPCLKR0
DSPDR0
DSPFSX0
/WR
/PAGE1
/RD
/SHZ
DSPDX0
/PAGE3
H1
CTDO
CTMS
CTDI
CTCK
D0
D1
D2
D3
D4
D5
D6
D7
D8
D9
D10
D11
D12
D13
D14
D15
CTDO
CTCK
CTMS
CTDI
/RST
/RST
TRSTTMS
TDO
TCK
TDI
EMU1EMU0
TCK
/SPIBOOT
MOSI
/RST5
SCK
/CSDSPLOAD
/DSPRST
/DSPRST2
/SPIBOOT2
MICS0
MICS1
MICS2
MICS[2..0]
/DSPRST
/SPIBOOT
TCLK1
/RDY
/WR
H1
/PAGE0
/PAGE3
/PAGE1
A1
A0
/RSTDSP
AUXDSPSFX
LRCLKPCM1804
CLK3MHZ
DSPDR0
/INT1
/INT0
/INT2
/INT3
MUTE1
UP
LRCLKLIN
HPCLK
TCLK0
/AICCS
/LINCS
TCLK1
DSPCLKR0
DSPFSR0
/RD
A3
A2
MMISO
MMOSI
MSCK
/DVRCS
CMD
/ADCCS
/SPIBOOT
/DACCS
/CSDSP1
DIG0A
MUTE
100HZ
/CSDSP2
/MISOEN
/RST
DSPFSX0
AUXD0
AUXD1
AUXDSPDX
LEDST2
LEDST1
/PAGE0
/PAGE3
D8
D9
D10
D11
D12
D13
D14
D15
CTDI
CTCK
CTMS
MOSI
SCK
DSP2DATA
/ENC1
PRGEXP
MICS0
MICS1
MICS2
/ENC1
PRGEXP
MICS0
MICS1
MICS2
/DSPRST
/TXDACCS
LRCLKDAC
CTDO CTDOB
A17
A18
/ENC2
/ENDVR
AICADC
SMISO
PCMADC
SSCK
SMOSI
PCMDSP2
LRCLKAIC23
AICBCLK
VCC3
VCC3
VCC3
VCC2
VCC3
VCC3
VCC3
VCC3
VCC3
VCC3
+5V
VCC3
VCC3
VCC3
VCC3
VCC3
R46 10K
R41 10K
C63
10 pF
R44 10K
U22
TPIC6C595D
3
4
5
6
11
12
13
14
9
2
15
7
10
8
1
16
Q0
Q1
Q2
Q3
Q4
Q5
Q6
Q7
SDO
SDI
SCK
SCLR
RCK
OE
VCC
GND
R33 10K
U16
TMS320VC33PGE
102
99
100
98
103
96
95
127
122
121
120
119
36
35
33
32
42
41
47
48
124
128
125
44
45
30
29
27
26
24
22
21
20
19
17
16
14
13
11
10
8
7
5
4
3
93
92
91
90
88
87
85
84
82
81
79
78
76
75
74
73
104
111
130
106
110
38
39
131
134
114
113
133
132
117
116
138
139
6
15
23
31
37
43
53
60
69
77
86
94
108
115
129
143
12
28
46
66
83
101
123
137
49
40
34
25
18
9
2
89
80
72
63
56
97
105
112
118
126
140
1
144
142
141
71
70
68
67
65
64
62
61
59
58
57
55
54
52
51
50
107
109
136
135
TMS
TDO
TDI
TCK
TRST
EMU0
EMU1
RESET
INT0
INT1
INT2
INT3
PAGE0
PAGE1
PAGE2
PAGE3
R/W
STRB
HOLD
HOLDA
EDGEMODE
SHZ
MCBL/MP
IACK
RDY
A0
A1
A2
A3
A4
A5
A6
A7
A8
A9
A10
A11
A12
A13
A14
A15
A16
A17
A18
A19
D0
D1
D2
D3
D4
D5
D6
D7
D8
D9
D10
D11
D12
D13
D14
D15
DR0
DX0
EXTCLK
FSR0
FSX0
H1
H3
PLLVdd
PLLVss
TCLK0
TCLK1
XIN
XOUT
XF0
XF1
RSV0
RSV1
DVDD
DVDD
DVDD
DVDD
DVDD
DVDD
DVDD
DVDD
DVDD
DVDD
DVDD
DVDD
DVDD
DVDD
DVDD
DVDD
CVDD
CVDD
CVDD
CVDD
CVDD
CVDD
CVDD
CVDD
VSS
VSS
VSS
VSS
VSS
VSS
VSS
VSS
VSS
VSS
VSS
VSS
VSS
VSS
VSS
VSS
VSS
VSS
A20
A21
A22
A23
D16
D17
D18
D19
D20
D21
D22
D23
D24
D25
D26
D27
D28
D29
D30
D31
CLKR0
CLKX0
CLKMD0
CLKMD1
PG1
R42 10K
R47 10K
R35 33R
R43 10K
R53 220R
R31 10K
U10
SST39VF800A
17
18
19
20
21
22
23
24
25
26
2728
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
16
48
1
2
3
4
5
6
7
8
11
A17
A7
A6
A5
A4
A3
A2
A1
A0
CE
VSSOE
D0
D8
D1
D9
D2
D10
D3
D11
VDD
D4
D12
D5
D13
D6
D14
D7
D15
VSS
A18
A16
A15
A14
A13
A12
A11
A10
A9
A8
WE
P57
JTAG - CPLD
1
2
3
4
5
6
7
8
9
10
R51 10K
U13
SN74LVC125A
1
2
7
3
14
5
4
6
9
10
12
13
8
11
1OE
1A
GND
1Y
VCC
2A
2OE
2Y
3A
3OE
4A
4OE
3Y
4Y
U11
74HC138M
1
2
3
6
4
5
15
14
13
12
11
10
9
7
16
8
A
B
C
G1
G2A
G2B
Y0
Y1
Y2
Y3
Y4
Y5
Y6
Y7
VCC
GND
R36 10K
R45 10K
R40 10K
U17
EPM240TQFP100
1
2
3
4
5
6
7
8
15
16
17
18
19
20
21
26
27
28
29
30
33
34
35
36
37
38
39
40
41
42
47
48
49
50
51
52
53
54
55
56
57
58
61
66
67
68
69
70
71
72
73
74
75
76
77
78
81
82
83
84
85
86
87
88
89
90
91
92
95
96
97
98
99
100
12
14
62
64
43
44
23
22
24
25
11
65
10
32
46
60
79
93
13
63
9
31
45
59
80
94
IO
IO
IO
IO
IO
IO
IO
IO
IO
IO
IO
IO
IO
IO
IO
IO
IO
IO
IO
IO
IO
IO
IO
IO
IO
IO
IO
IO
IO
IO
IO
IO
IO
IO
IO
IO
IO
IO
IO
IO
IO
IO
IO
IO
IO
IO
IO
IO
IO
IO
IO
IO
IO
IO
IO
IO
IO
IO
IO
IO
IO
IO
IO
IO
IO
IO
IO
IO
IO
IO
IO
IO
IO
IO
IO/GCLK0
IO/GCLK1
IO/GCLK2
IO/GCLK3
IO/DEV_OE
IO/DEV_CLRn
TDI
TMS
TCK
TDO
GNDINT
GNDINT
GNDIO
GNDIO
GNDIO
GNDIO
GNDIO
GNDIO
VCCINT
VCCINT
VCCIO1
VCCIO1
VCCIO1
VCCIO2
VCCIO2
VCCIO2
PG2
D4 STATUS1
21
R62
330R
R37 100R
R38 10K
R48 10K
R39 10K
P59
JTAG-DSP
1 2
3 4
5 6
7 8
9 10
11 12
13 14
R32 10K
R54 220R
R34 10K
R52 10K
D3 STATUS2
21
Y1 14.7456 MHz
C62
10 pF
R58 10K
U21
MCP120D
12
3
RSTVDD
VSS
TCLK0
/DSP1BUSYA
DSPDX0
/RST
/CSDSPLOAD
MOSI
SCK
/DSPRST2
/SPIBOOT2
/RST5
MICS[2..0]
AUXDSPFSX
LRCLKPCM1804
CLK3MHZ
MUTE1
UP
LRCLKLIN
HPCLK
/AICCS
/LINCS
AUXDSPDX
MMISO
MMOSI
100HZ
MSCK
/DVRCS
CMD
/ADCCS
/DACCS
/CSDSP1
DIG0A
/CSDSP2
/MISOEN
DSP1DATAA
DSP2DATA
LRCLKDAC
/TXDACCS
PRGEXP
CTDOB
/ENC1
/ENC2
/ENDVR
SMISO
LRCLKAIC23
AICADC
PCMDSP2
PCMADC
SMOSI
SSCK
AICBCLK
AUXD1
AUXD0
MUTE
5
5
4
4
3
3
2
2
1
1
D D
C C
B B
A A
NOTES:
PCB Revision C
2004051101 C
K3 DSP: Power Supply
Elecraft, Inc. Copyright (C) 2007 - 2010.
L Johnson
B
69Wednesday, June 16, 2010
Title
Size Document Number Rev
Date: Sheet of
VCC3 VCC2
+5V
VCC8A
VCC3
VCC3
VCC2
VCC8A
VCC3
VCC5A
VCC3A
+5V
VCC5A
U28
UA78M08CDC
1
2 4
3
+VIN
GND TAB
OUT
C61
0.1 uF
C86
0.1 uF
TP1
GND
1
2A
B
+
C27
10 uF/25V
C46
0.1 uF
+
C103
10 uF/25V
C58
0.1 uF
+
C104
10 uF/25V
C70
0.1 uF
C59
0.1 uF
C74
0.1 uF
C77
0.1 uF
+
C93
100 uF/10V
TP3
GND
1
2A
B
C35
0.1 uF
C21
0.1 uF
C12
0.1 uF
C79
0.1 uF
C68
0.1 uF
C64
0.1 uF
C54
0.033 uF
+
C85
100 uF/10V
U26
FAN1086M33
3
1
2
4
VI
GND
VO
VO
C78
0.1 uF
C100
0.1 uF
U27
UA78M05CDC
1
2 4
3
+VIN
GND TAB
OUT
C39
0.1 uF
C73
0.1 uF
C71
0.1 uF
+
C29
10 uF/25V
TP2
GND
1
2A
B
C65
0.1 uF
C38
0.1 uF
C60
0.1 uF
C53
0.1 uF
C49
0.1 uF
L1 100 uH
L2 100 uH
+
C51
10 uF/25V
C56
10 uF 10v ECJ
C105
0.1 uF
C50
0.1 uF
C75
0.1 uF
C72
0.1 uF
C23
0.1 uF
C52
0.1 uF
C87
0.1 uF
C57
0.1 uF
U9
LP3982
2 1
7
8
4
5
3 6
IN OUT
SHDN
FAULT
OUT
ADJ
GND CC
C66
0.1 uF
C102
0.1 uF
C69
0.1 uF
C55
0.1 uF
+12V
MICBIAS
5
5
4
4
3
3
2
2
1
1
D D
C C
B B
A A
NOTES:
PCB Revision C
2004051101 C
K3 DSP: INTERCONNECTS AND MISCELLANEOUS
Elecraft, Inc. Copyright (C) 2007 - 2010.
L Johnson
B
79Wednesday, June 16, 2010
Title
Size Document Number Rev
Date: Sheet of
MSCK
/DVRCS
MMISO
CMD
MMOSI
PGD
RX2_BIF-
/CSDSP2A
SMOSI
RX2_IF+
DSP2DATAA
/RST2
CLK3MHZ
FSX2
SMISO
/AUXDETECT
LRCLKPCM1804
DX2
/DSP2BUSYA
PCMDSP2
HAGC2
VSMETER2
/ENC2
AICBCLK
RX2_BIF+
SSCK
RX2_IF-
VIFGAIN2
/SPIBOOT2
VIFGAIN2
/DSP2BUSY
100HZ /DSP2BUSYA
SPKR_L
MOSI
BK_MICAF+
/CSDSP2
SPKR_R
SMOSI
MICBIAS
LINE_IN+
/DSP1BUSYA
MOSI
RX2_IF-
SCK
PHONES_L
BK_MICAF-
DIG0
VFWD
BK_PH_R
/CSDSP2A
TXIFI
LINEOUT_L
SSCK
MICIN
DSP1DATA
RX1_IF+
DSP2DATA
SCK
/MISOEN
LINEOUT_R
/RST5
MISO
PHONES_R
VREF
LINE_IN-
PHONES_L
TXIFQ
/DSP1BUSYRX1_IF-
/DSP1BUSY
SPKR_L
/CSDSP2
HAGC1
VSMETER
BK_PH_L
/CSDSP1
RX2_IF+
HAGC2
DIG0A
MISO
DIG0
ALC
100HZA
VIFGAIN1
MUTE
/CSDSP1 /CSDSP1A
/CSDSPLOAD
100HZ
BK_PH_SW
SPKR_R
/DSP2BUSY
/RST
SMISO
PHONES_R
DSP1DATA
DSP2DATADSP2DATAA
DSP1DATAA
PRGEXP
CTDOB MISO
SMISO
/ENC1
/ENC2
DSP2DATA
DSP2DATA
PGC
PGD
/MCLR
/MCLR
/ENDVR
SCK
PGC
MOSI
PH_SW
AUXD0
AUXD1
MUTE MUTEA
VCC3
VCC3
VCC8A
VCC3
+5V
+12V
+5V
+5V
+5V
VCC3
VCC3
PJG2
C67
0.1 uF
THERM03 1
FIDCL1
STNDO2
AUX DSP
1
R7 8.2R
THERM01 1
C76
0.1 uF
STNDO9
SHIELD
1
FIDCL2
STNDO5
AUX DSP
1
STNDO3
K3FP
1
R5 8.2R
STNDO1
KDVR3
1
J53
Aux DSP
1
2
3
4
5
J50
DSP AF
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
R49 10K
STNDO7
K3FP
1
U19
74VHCT244
2
4
6
8
11
13
15
17
1
19
18
16
14
12
9
7
5
3
20
10
1A1
1A2
1A3
1A4
2A1
2A2
2A3
2A4
1G
2G
1Y1
1Y2
1Y3
1Y4
2Y1
2Y2
2Y3
2Y4
VCC
GND
U14
SN74LVC125A
1
2
7
3
14
5
4
6
9
10
12
13
8
11
1OE
1A
GND
1Y
VCC
2A
2OE
2Y
3A
3OE
4A
4OE
3Y
4Y
STNDO6
AUX DSP
1
J51
DSP IF
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
STNDO4
K3FP
1
C26
0.1 uF
STNDO8
K3FP
1
J52
Aux DSP
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
C5
0.1 uF
R12 8.2R
U20
74LCX541
2
3
4
5
6
7
8
9
1
19
18
17
16
15
14
13
12
11
20
10
A1
A2
A3
A4
A5
A6
A7
A8
G1
G2
Y1
Y2
Y3
Y4
Y5
Y6
Y7
Y8
VCC
GND
J1
PHONES
9
3
8
4
2
1
7
6
5
P32
DSP MIC
1
2
3
4
5
SPARE1
U12
NC7SZ14
2 4
53
PJG1
P31
FP-DSP
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
R4 8.2R
THERM02 1
J54
DVR
1
2
3
4
5
6
7
8
9
10
U15
74HCT125
1
2
7
3
14
5
4
6
9
10
12
13
8
11
1OE
1A
GND
1Y
VCC
2A
2OE
2Y
3A
3OE
4A
4OE
3Y
4Y
MMOSI
MSCK
/DVRCS
CMD
MMISO
RX1_IF+
RX1_IF-
VFWD
VREF
HAGC1
BK_PH_SW
ALC
LINE_IN-
LINE_IN+
BK_MICAF-
BK_MICAF+
MICIN TXIFI
TXIFQ
VIFGAIN1
SPKR_L
SPKR_R
LINEOUT_R
LINEOUT_L
PHONES_L
PHONES_R
/RST2
MICBIAS
SMOSI
SSCK
/CSDSP1A
DIG0A
100HZA
/CSDSP2A
SMISO
/DSP1BUSYA
/RST
/MISOEN
/RST5
/SPIBOOT2
PCMDSP2
LRCLKPCM1804
CLK3MHZ
AICBCLK
FX2
/ENC2
/AUXDETECT
VSMETER2
DX2
PRGEXP
DSP2DATA
DSP1DATAA
MOSI
SCK
/CSDSPLOAD
VSMETER
CTDOB
/ENC1
/ENDVR
RX2_BIF+
RX2_BIF-
PH_SW
AUXD0
AUXD1
MUTEA
5
5
4
4
3
3
2
2
1
1
D D
C C
B B
A A
NOTES:
PCB Revision C
2004051101 C
K3 DSP: RX IF BUFFER
Elecraft, Inc. Copyright (C) 2007 - 2010.
L Johnson
A
89Wednesday, June 16, 2010
Title
Size Document Number Rev
Date: Sheet of
VCC8A
VCC8A
R55 909R
C90 10 uF/10V
C91 1000 pF
R60 3K
C88
2700 pF
+
C84
10 uF/16V
C83
0.1 uF
+
-
Vocm
EN
U24
OPA1632D
8
1
4
36
5
2
7
+
C92
10 uF/16V
R56 51R
R57 3K
R59 51R
R61 909R
C82 10 uF/10V
C81 1000 pF
RX1_BIF-
RX1_BIF+RX1_IF+
RX1_IF-
5
5
4
4
3
3
2
2
1
1
D D
C C
B B
A A
NOTES:
PCB Revision C
2004051101 C
K3 DSP: TX DAC
Elecraft, Inc. Copyright (C) 2007 - 2010.
L Johnson
A
99Wednesday, June 16, 2010
Title
Size Document Number Rev
Date: Sheet of
AICBCLK
LRCLKDAC
VMIDT
TCLK0
/TXDACCS
MSCK
MMOSI
DSPDX0
TXLOUT
TXROUT
TXIFI
TXIFQ
VCC3AT
VCC3
VCC3
C95
0.1 uF
+
C98
10 uF/16V
L3 100 uH
+
C94
10 uF/25V
C99
10 uF 10v ECJ
C96
10 uF 10v ECJ
C101
0.1 uF
U25
TLV320DAC23
1
11
23
24
21
22
27
28
4
5
3
25
2
8
15
14
9
10
16 26
12
13
BVDD
HPGND
SDIN
SCLK
CS
MODE
DVDD
DVSS
DIN
LRCIN
BCLK
XTI/MCLK
CLKOUT
HPVDD
AVSS
AVDD
LHPOUT
RHPOUT
VMID XTO
LOUT
ROUT
C97
0.1 uF
AICBCLK
DSPDX0
MMOSI
/TXDACCS
MSCK
TCLK0
LRCLKDAC
TXIFI
TXIFQ
5
5
4
4
3
3
2
2
1
1
D D
C C
B B
A A
E2008090801 A
K3: AF Filter
Elecraft, Inc. Copyright (C) 2009 - 2010.
L Johnson
A
11Wednesday, June 16, 2010
Title
Size Document Number Rev
Date: Sheet of
VCC8A VCC8A
VCC8A VCC8A
VCC8A
R7
10.5K 1%
C2
1500 pF 5% C0G
TP5
AFOUT1
1
R4
34.0K 1%
C5
1000 pF 5% C0G
C7
0.015 uF 5% X7R
+
-
U1D
TLC2274
12
13
14
411
R2
60.4K 1%
TP2
+8V 1
+
-
U1A
TLC2274
3
2
1
411
C1
0.1 uF
+
-
U1B
TLC2274
5
6
7
411
TP6
AFOUT2
1
TP4
AFIN2 1
R1
60.4K 1%
C4
1000 pF 5% C0G
TP3
GND 1
R6
10.5K 1%
TP1
AFIN1 1
C9
1000 pF 5% C0G
C6
0.015 uF 5% X7R
R5
10.5K 1%
+
-
U1C
TLC2274
10
9
8
411
C8
1000 pF 5% C0G
C3
1500 pF 5% C0G
R8
10.5K 1%
R3
34.0K 1%
C:\Projects\K3\Schematics\K3 LPA revA.sch - Sheet1
W. Burdick
Elecraft
Rev. Sht. DateBy
Appendix B
1 of 4
10
K1A K1B
L3
2
4
3
7
5
6
L1
18
L4
2.2
K2A
24
3
K2B
7 5
6
C1
2000 C5 390
C6
2000
L5
2.2
L2
18
C2
2000
RESET = 0.5-2
10
K3A K3B
L8
2
4
3
7
5
6
L6
1.5
L9
1.0
K4A
7
5
6
K4B
24
3
C9
910 C13 36
C14
56
L10
1.0
L7
1.5
C10
910
RESET = 4-7
6.8
K5A K5B
L13
2
4
3
7
5
6
(Cp ~3 pF)
L11
0.56
L14
0.68
K6A
24
3
K6B
7 5
6
C17
510
C22
22
C21
22
L15
0.68
L12
0.56
C18
510
RESET = 10-14
5.2
K7A K7B
L18
2
4
3
7
5
6
35t #28, T37-2
L16
0.22
L19
0.39
K8A
7
5
6
K8B
24
3
C25
470
C30
9
L20
0.39
L17
0.22
C28
560
RESET = 18-23
4-7/7-10 MHz
10-14/14-18 MHz 18-23/23-28 MHz
SCK3
K1
K2
K4
K3
1
8
SRCK
SOUT
/CLR RCK
SIN
VCC
/Q0
/Q1
/Q2
/Q3
/Q7
/Q6
/Q4
/Q5
GND
10
15
14
13
12
11
16
/G 9
2
3
1
4
5
6
7
8
U1
SCK3
.01
C34
C31
C32
C33
C35
TPIC6C595D
C39
.01
C36
.01
5V
KBPF3
K5
K6
K8
K7
1
8
SRCK
SOUT
/CLR RCK
SIN
VCC
/Q0
/Q1
/Q2
/Q3
/Q7
/Q6
/Q4
/Q5
GND
10
15
14
13
12
11
16
/G 9
2
3
1
4
5
6
7
8
U2
SCK3
.01
C44
C41
C42
C43
TPIC6C595D
C40
.01
5V
MISO3
MISO3
MISO3
MOSI3
LD_BPF2
LD_BPF2
LD_BPF2
C26
470
C27
560
C29
9
C20
820
C19
820
C12
1500
C11
1500
3 2 1
J44E
321
J44C
1
2
3
4
5
6
J44A
NOTE: K1-K8 are shown in the RESET position.
All relays are mounted on the back side of the PCB.
C3
.01
C4
.01
SET = 2-3.5 SET = 7-10
SET = 14-18 SET = 23-28
0.5-2/2-3.5 MHz
RFC1
22
5V
A6/29/07
5
5
4
4
3
3
2
2
1
1
D D
C C
B B
A A
NOTES: 1. KXV3-1 and -2 modules are soldered together
via right-angle male connectors at J/P41A/C.
2. K1 and K2 are DPDT relays shown in RESET position.
3. W1 and W2 on the RF board must be removed or
cut when the KXV3 is installed.
3.6VDC ~
1.0 mW
RF Detector
4. W4 must be installed on the RF board when the KXV3
is installed (between RF-P86 and KXV3-P87).
2006030602 B1
KXV3: Main
Elecraft, Inc. Copyright (C) 2007 - 2010.
L Johnson
B
11Wednesday, June 16, 2010
Title
Size Document Number Rev
Date: Sheet of
MOSI3
SCK3
LD_XV
/LP
/LP
MISO3
7R
LPTX
7T
12V_SW
12V_SW
12V_SW
12V_SW
P41B
4-pin RA
1
2
3
4
C1
0.01 uF
C6
0.01 uF
R6
100K
L1
100 uH
C13
100 pF
C9
1000 pF
D1
BAP64-05
1
3
2
R9
2K2
Q2
MMBT3906
1
23
P66
K3 RF Board
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
D5
BAP64-04
1
3
2
C16
0.1 uF
R11
1K
C10
0.01 uF
D3
1N5711W
21
R15
300R
R13 100R
R3
1M
C2
0.01 uF
U2
TPIC6B595DW
3
4
5
6
11
12
13
14
9
2
15
7
10
8
1
16
Q0
Q1
Q2
Q3
Q4
Q5
Q6
Q7
SDO
SDI
SCK
SCLR
RCK
OE
VCC
GND
K1
DPDT
3
2
4
8
9
7
1
10
C3
0.01 uF
R10
2K2
C7
0.01 uF
R5
180K
C17
0.1 uF
D4
5V1
1 3
R12
1K
C8
0.01 uF
D2
1N5711W
21
C14
0.1 uF
RFC1
47 uH
C12
0.01 uF
+
-
U1A
TLV272
3
2
1
84
L2
100 uH
R7
1M
+
-
U1B
TLV272
5
6
7
84
P41A
4-pin RA
1
2
3
4
R2
470K
C11
0.1 uF
R14
68R
R8
2K2
C4
0.01 uF
Q1
MMBT3904
1
2
3
R1
1K
R4
330R
K2
DPDT
3
2
4
8
9
7
1
10
C15
0.1 uF
C5
0.01 uF
5
5
4
4
3
3
2
2
1
1
D D
C C
B B
A A
NOTES: 1. KXV3-1 and -2 modules are soldered together
via right-angle male connectors at J/P41A/C.
2. K1 - K3 are DPDT relays shown in RESET position.
3.6VDC ~
1.0 mW
RF Detector
2006030602 D
KXV3A: Main
Elecraft, Inc. Copyright (C) 2007 - 2010.
L Johnson
B
11Wednesday, June 16, 2010
Title
Size Document Number Rev
Date: Sheet of
MOSI3
SCK3
LD_XV
/LP
/LP
MISO3
7R
LPTX
7T
12V_SW
12V_SW
12V_SW
12V_SW
12V_SW
P41B
4-pin RA
1
2
3
4
C1
0.01 uF
C6
0.01 uF
R6
100K
C13
100 pF
C9
1000 pF
L2
100 uH
D1
BAP64-05
1
3
2
R9
2K2
Q2
MMBT3906
1
23
P66
K3 RF Board
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
D5
BAP64-04
1
3
2
C16
0.1 uF
R11
1K
C10
0.01 uF
R15
300R
D3
1N5711W
21
K3
DPDT
3
2
4
8
9
7
1
10
R13 100R
R3
1M
C2
0.01 uF
C23
56 pF
U2
TPIC6B595DW
3
4
5
6
11
12
13
14
9
2
15
7
10
8
1
16
Q0
Q1
Q2
Q3
Q4
Q5
Q6
Q7
SDO
SDI
SCK
SCLR
RCK
OE
VCC
GND
K1
DPDT
3
2
4
8
9
7
1
10
C3
0.01 uF
C19
0.01 uF
R10
2K2
C21
0.01 uF
L1
100 uH
R5
180K
C17
0.1 uF
J1
XVTR IN INT
1
2
3
D4
5V1
1 3
R12
1K
C8
0.01 uF
D2
1N5711W
21
C14
0.1 uF
RFC1
47 uH
C12
0.01 uF
+
-
U1A
TLV272
3
2
1
84
RFC3
47 uH
C20
0.01 uF
R7
1M
+
-
U1B
TLV272
5
6
7
84
P41A
4-pin RA
1
2
3
4
R2
470K
C11
0.1 uF
C7
0.01 uF
R14
68R
R8
2K2
J2
XVTR OUT INT
1
2
3
C4
0.01 uF
C22
56 pF
Q1
MMBT3904
1
2
3
RFC2
47 uH
R1
1K
L3 0.15 uH
R4
330R
C15
0.1 uF
K2
DPDT
3
2
4
8
9
7
1
10
C18
0.01 uF
C5
0.01 uF
5
5
4
4
3
3
2
2
1
1
D D
C C
B B
A A
2006030602 A1
KXV3: Connector
Elecraft, Inc. Copyright (C) 2007 - 2010.
L Johnson
A
11Wednesday, June 16, 2010
Title
Size Document Number Rev
Date: Sheet of
J38
XVTR In
1
2
3
4
5
MT1
SWAGE
1
C2
Not Used
J41A
4-pin RA
1
2
3
4
GAP1
SPARK GAP
J41B
4-pin RA
1
2
3
4
MT2
SWAGE
1
R2
1M
C1
2 pF
J37
RX Ant Out
1
2
3
4
5
J39
XVTR Out
1
2
3
4
5
J40
I.F. Out
1
2
3
4
5
R1
100K
J87
RX IF
1
2
3
Q1
BCV27
2
1
3
J36
RX Ant In
1
2
3
4
5
C3
0.1 uF
D1 BAT54S
13
2
W. Burdick
E. Swartz
Elecraft
Rev. Sht. DateBy
0.48 µH0.05 µH 0.11 µH 0.23µH
L1 L2 L3 L4
C1 C2 C3 C4
12 22 39 82
C TX
C ANT
4.4 µH1.0 µH 2.1 µH
L5 L6 L7
9.0 µH
L8
1 of 1
150
C5A C5B
12 330
C6
330
C7A C7B
330 330
C8A
C8B
330
C8C
330
C8D
330
SA1
SA2
L10 96 nH
C10
3900
J69A
To J7
J69B
To J8
RFC1
47 uH
0.1
C24
0.1
C25
K8
K7
K14
K13
K12
K5
1
16
SRCK
SOUT
/CLR RCK
SIN
VCC
/Q0
/Q1
/Q2
/Q3
/Q7
/Q6
/Q4
/Q5
GND
10
15
14
13
12
11
16
/G 9
2
3
1
4
5
6
7
8
U2
C36
C27
C45
C32
C34
C35
C44
5V
TPIC6C595D
K6
K11
K4
K3
K16
K10
K9
K1
1
16
SRCK
SOUT
/CLR RCK
SIN
VCC
/Q0
/Q1
/Q2
/Q3
/Q7
/Q6
/Q4
/Q5
GND
10
15
14
13
12
11
16
/G 9
2
3
1
4
5
6
7
8
U3
.01
C38
C31
C30
C37
C39
C42
C29
5V
TPIC6C595D
K2
K15
K18
K17
1
16
SRCK
SOUT
/CLR RCK
SIN
VCC
/Q0
/Q1
/Q2
/Q3
/Q7
/Q6
/Q4
/Q5
GND
10
15
14
13
12
11
16
/G 9
2
3
1
4
5
6
7
8
U4
C40
C41
C55
5V
TPIC6C595D
12V_ATU
100
C16
100
C17
100
C18
100
C19
100
C20
100
C21
.001
C22
.001
C23
KAT3 ATU
78L05
OUT
GND
IN
U1
5V
0.1
C15
0.1
C14
0.1
C13
R1
560K
R2
560K
11
13
6 8
4
9
K2
11
13
6 8
4
9
K1
11
13
6 8
4
9
K3
11
13
6 8
4
9
K4
11
13
6 8
4
9
K5
11
13
6 8
4
9
K6
11
13
6 8
4
9
K7
11
13
6 8
4
9
K8
11
13
6 8
4
9
K17
11
13
6
8
4
9
K9
11
13
6
8
4
9
K10
11
13
6
8
4
9
K11
11
13
6
8
4
9
K12
11
13
6
8
4
9
K13
11
13
6
8
4
9
K14
11
13
6
8
4
9
K15
11
13
6
8
4
9
K16
11
13
6
8
4
9
K18
Main Ant. Switch
47
C12
C Ant./C TX Select
.01
C26
C28
.01
C47
C50
C48
.01
C33
C43
.01
C46
C49
.01
C52
.01
C51
C53
.01
C54
= Parts mounted on the bottom of the PC board. In addition to these, all relays are on the bottom.
(ANT1)
(ANT2)
I.F. Trap
40 nH
L9
9
7
8
2
4
3
K19
K19
1
10
Sub. RX Ant. Switch
J43
To Sub. RX
10
11
12
13
14
15
16
17
18
19
20
1
2
3
4
5
6
7
8
9
J70
RF Board
SCK3
LD_ATU
MISO3
K1-K19 are shown in the RESET position.
R3
R4
R5
R6
470
470
470
100
MOSI3
.01
C56
.01
C57
P42
1 2
Trap 2
12
J72
C11
XD3 7/11/07
5
5
4
4
3
3
2
2
1
1
D D
C C
B B
A A
2004090101 XG
K3: Digital Voice Recorder
Elecraft, Inc. Copyright (C) 2008 - 2010.
L Johnson
A
11Wednesday, June 16, 2010
Title
Size Document Number Rev
Date: Sheet of
D0
D1
D2
D3
SCK
CMD
MISO
MOSI
PGD
PGC
/MCLR
/DVRCS
D7
D5
D6
D4
D[7:0]
D0
D6
D5
D4
RDY
D7
D3
D2
D1
/MCLR
/BYTE
SCK2
/DVRCS
CMD
MISO1
SCK1
MOSI
PGD
PGC
/CS
/WP
MOSI2
/RST
TP3
TP5
TP4
TP2
TP1
TP1
TP2
TP3
TP4
TP5
/RST
MISO2
MOSI2
/BYTE
RDY
/WP
/CS
SCK2
MISO2
/DVRCS
MISO1
SCK1
MISO
SCK
VCC3
VCC3
VCC3
VCC3
VCC3
VCC3
VCC3
VCC3
VCC3
VCC3
C6
0.1 uF
U3
PIC24HJ64GP206
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
18
17
19
20
21
22
23
24
25
26
27
28
29
30
31
32 33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
RG15
RC1
RC2
RG6/SCK2
RG7/SDI2
RG8/SDO2
MCLR
RG9/SS2
VSS
VDD
RB5
RB4
RB3
RB2/SS1
RB1/PGC3
RB0/PGD3
RB7/PGD1
RB6/PGC1
AVDD
AVSS
RB8/U2CTS
RB9
RB10/TMS
RB11/TDO
VSS
VDD
RB12/TCK
RB13/TDI
RB14/U2RTS
RB15
RF4/U2RX
RF5/U2TX U1TX/SDO1/RF3
U1RX/SDI1/RF2
U1RTS/SCK1/RF6
SDA1/RG3
SCL1/RG2
VDD
CLKIN/RC12
CLK0/RC15
VSS
RD8
U1CTS/RD9
RD10
RD11
RD0
PGD2/RC13
PGC2/RC14
RD1
RD2
RD3
RD4
RD5
RD6
RD7
VDDcore
VDD
RF0
RF1
RG1
RG0
RG14
RG12
RG13
+
C1
10 uF/25V
TP2
TP
1
R1
10K
TP1
TP
1
R2 120R
ST1
STANDOFF
1
TP3
TP
1
C2
0.1 uF
R4
47K
Z1
8.0 MHz
1 3
2
TP4
TP
1
R3 120R
C3
0.1 uF
U1
74LVC2G125
1
7
2
5
6
3
4
8
1OE
2OE
1A
2A
1Y
2Y
GND
VCC
C5
10 uF 10v ECJ
C4
0.1 uF
TP5
TP
1
U2
AT45DB642D-TU
13
12
11
2
3
6
7
14
21
22
16
17
18
19
20
23
24
25
26
1
SI
SCK
CS
RESET
WP
Vcc
GND
SO
GNDP
VCCP
SER/BYTE
DQ0
DQ1
DQ2
DQ3
DQ4
DQ5
DQ6
DQ7
RDY
P54
Main DSP
1
2
3
4
5
6
7
8
9
10
C:\Projects\K3\Schematics\KPAIO3revXI.sch - Sheet1
5
5
4
4
3
3
2
2
1
1
D D
C C
B B
A A
PCB Revision A
NOTES:
2004051101 A0
K3 Aux DSP: Top Level
Elecraft, Inc. Copyright (C) 2007 - 2010.
L Johnson
A
15Wednesday, June 16, 2010
Title
Size Document Number Rev
Date: Sheet of
Power
Power
DSP
DSP
SCK
FSX2
MISO
MMOSI
/CSDSP2
MSCK
DR2
/SPIBOOT2
MOSI
/DACCS
CLKX2
/DSP2BUSYA
FSR2
CLKR2
DX2
/RST2
/ADCCS
MMISO
DSP2DATA
DSP2DATAA
/ENC2
MSCKA
MMOSIA
AUXDSPD0
AUXDSPD1
ANALOG INTERFACE
ANALOG INTERFACE
VIFGAIN2
VSMETER2
/DACCS
MMOSI
MSCK
MMISO
/ADCCS
HAGC2
MMOSIA
MSCKA
IF BUFFER
IF BUFFER
RX2_IF-
RX2_IF+ RX2_BIF+
RX2_BIF-
CLKX2
DX2
SCK
/CSDSP2
MISO
FSX2
MOSI
/DSP2BUSYA
CLKR2
DR2
FSR2
/ENC2
/RST2
/SPIBOOT2
RX2_IF+
VIFGAIN2
RX2_IF-
RX2_IF+
RX2_IF-
RX2_BIF+
RX2_BIF-
/SPIBOOT2
/RST2
MISO
MOSI
SCK
/CSDSP2
/RST2
DSP2DATAA
/SPIBOOT2
DR2
FSR2
CLKR2
FSX2
DX2
CLKX2
/DSP2BUSYA
/AUXDETECT
RX2_BIF-
VSMETER2
RX2_BIF+
MSCK
VSMETER2MMOSI
VIFGAIN2
HAGC2
/ENC2
HAGC2
MMISO
DSP2DATA
DSP2DATAA
DSP2DATA
/DACCS
/ADCCS
MMOSIA
MSCKA
AUXDSPD0
AUXDSPD1
AUXDSPD0
AUXDSPD1
VCC3
+8V
VCC3 STNDO3
MAIN DSP
1
P53
Main DSP
1
2
3
4
5
STNDO1
MAIN DSP
1
R21 10K0
P52
Main DSP
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
STNDO2
MAIN DSP
1
R20 10K0
5
5
4
4
3
3
2
2
1
1
D D
C C
B B
A A
NOTES:
PCB Revision A
2004051101 A0
K3 Aux DSP: Analog Interface
Elecraft, Inc. Copyright (C) 2007 - 2010.
L Johnson
A
25Wednesday, June 16, 2010
Title
Size Document Number Rev
Date: Sheet of
MSCK
VSMETER2
VIFGAIN2MMOSI
/DACCS
MSCKA
HAGC2
MMISO
MMOSIA
/ADCCS
VCC3
VCC3A
VCC3VCC3A
U4
ADC78H90CIMT
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
CS
AVDD
AGND
AIN1
AIN2
AIN3
AIN4
AIN5
AIN6
AIN7
AIN8
DGND
DVDD
DIN
DOUT
SCLK
U7
AD5302A
1
2
3
4
5
67
8
9
10
LDAC
VDD
VREFB
VREFA
VOUTA
VOUTBSYNC
SCLK
DIN
GND
VIFGAIN2
VSMETER2/DACCS
MMOSI
MSCK
HAGC2 /ADCCS
MMISO
MMOSIA
MSCKA
5
5
4
4
3
3
2
2
1
1
D D
C C
B B
A A
NOTES:
PCB Revision A
2004051101 A0
K3 Aux DSP: DSP and Logic
Elecraft, Inc. Copyright (C) 2007 - 2010.
L Johnson
B
35Wednesday, June 16, 2010
Title
Size Document Number Rev
Date: Sheet of
A15
D1
A11
TDO
A9
D3
A2
A13
EMU0
TCK
A5
TDI
/INT1
D10
/PAGE0
A4
D11
TMS
A10
/RDY
TRST
TMS
D8
/DSP2BUSYA
A8
D9
/WR
A1
DX2
TRST
DSPCLKR
A16
TCK
/PAGE1
EMU1
EMU1
/SHZ
A3
A14
D12
D5
FSX2
A12
A7
A6
D13
D15
D2
A18
CLKX2
A17
D4
D7
TCK
A0
D14
D6
/DSPRST
/PAGE3
TDO
TDI
D0
EMU0
H1CLK
CTCK
CTDI
CTMS
CTDO
/HOLD
/INT0
/INT2
/INT3
MCBL
D0
D3
D2
D4
D6
D7
D5
D1
D8
D9
D10
D15
D11
D14
D12
D13
/DSPRST
DSPCLKR
/CSDSP2
/RST2
/SPIBOOT2
/DACCS
/INT2
/INT3
/INT1
/INT0
/RDY
H1CLK
/RD
/WR
A0
A1
A2
/PAGE0
/PAGE3
/PAGE1
A10
D15
D5A5
D13
A3
A9
/RD
D8
A2
A6
A12
D3
D10
A13
/PAGE1
A4 D4
A1
D0
D14
/WR
A8
A14
D9
A16
D6
D7A7
D12
D11
D1
D2
A15
A0
A11
MOSI CTDI
CTMSDSP2DATA
CTDI
CTMS
CTDO
CTCK
DSP2DATAA
SMOSI
MSCK
/PAGE3
MMISO
/ADCCS
/DACCS
/PAGE0
MMOSI
SSCK
SMISO
/DSPRST
SMOSI
SMISO
SCKSSCK
MISO
MOSI
/ENC2
CTCKSCK
MMISO
/ADCCS
MMOSIA
MSCKA
MSCK
MMOSI
A18
A17
/ENC2
DR2
DSPDR
DSPDR
FSR2
DSPFSR
CLKR2
MISOCTDO
/INT0
/INT1
/INT2
/INT3
DSPFSR
AUXDSPD0
AUXDSPD1
VCC3
VCC2
VCC3
VCC3
VCC3
VCC3
VCC3
VCC3
VCC3
VCC3
VCC3
VCC3
VCC3
R12 10K0
R15 3K00
R10 10K0
MSCK
C8
10 pF
/INT1
R3 10K0
SMISO
U3
TMS320VC33PGE
102
99
100
98
103
96
95
127
122
121
120
119
36
35
33
32
42
41
47
48
124
128
125
44
45
30
29
27
26
24
22
21
20
19
17
16
14
13
11
10
8
7
5
4
3
93
92
91
90
88
87
85
84
82
81
79
78
76
75
74
73
104
111
130
106
110
38
39
131
134
114
113
133
132
117
116
138
139
6
15
23
31
37
43
53
60
69
77
86
94
108
115
129
143
12
28
46
66
83
101
123
137
49
40
34
25
18
9
2
89
80
72
63
56
97
105
112
118
126
140
1
144
142
141
71
70
68
67
65
64
62
61
59
58
57
55
54
52
51
50
107
109
136
135
TMS
TDO
TDI
TCK
TRST
EMU0
EMU1
RESET
INT0
INT1
INT2
INT3
PAGE0
PAGE1
PAGE2
PAGE3
R/W
STRB
HOLD
HOLDA
EDGEMODE
SHZ
MCBL/MP
IACK
RDY
A0
A1
A2
A3
A4
A5
A6
A7
A8
A9
A10
A11
A12
A13
A14
A15
A16
A17
A18
A19
D0
D1
D2
D3
D4
D5
D6
D7
D8
D9
D10
D11
D12
D13
D14
D15
DR0
DX0
EXTCLK
FSR0
FSX0
H1
H3
PLLVdd
PLLVss
TCLK0
TCLK1
XIN
XOUT
XF0
XF1
RSV0
RSV1
DVDD
DVDD
DVDD
DVDD
DVDD
DVDD
DVDD
DVDD
DVDD
DVDD
DVDD
DVDD
DVDD
DVDD
DVDD
DVDD
CVDD
CVDD
CVDD
CVDD
CVDD
CVDD
CVDD
CVDD
VSS
VSS
VSS
VSS
VSS
VSS
VSS
VSS
VSS
VSS
VSS
VSS
VSS
VSS
VSS
VSS
VSS
VSS
A20
A21
A22
A23
D16
D17
D18
D19
D20
D21
D22
D23
D24
D25
D26
D27
D28
D29
D30
D31
CLKR0
CLKX0
CLKMD0
CLKMD1
PG3
ADCCS
R11 10K0
R13 10K0
SSCK
R18 10K0
R2 10K0
/INT2
PG0
DACCS
U2
SST39VF800A
17
18
19
20
21
22
23
24
25
26
2728
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
16
48
1
2
3
4
5
6
7
8
11
A17
A7
A6
A5
A4
A3
A2
A1
A0
CE
VSSOE
D0
D8
D1
D9
D2
D10
D3
D11
VDD
D4
D12
D5
D13
D6
D14
D7
D15
VSS
A18
A16
A15
A14
A13
A12
A11
A10
A9
A8
WE
P61
JTAG - CPLD
1
2
3
4
5
6
7
8
9
10
U6
SN74LVC125A
1
2
7
3
14
5
4
6
9
10
12
13
8
11
1OE
1A
GND
1Y
VCC
2A
2OE
2Y
3A
3OE
4A
4OE
3Y
4Y
R6 10K0
Y1 14.7456 MHz
R4 10K0
R7 10K0
U5
EPM240TQFP100
1
2
3
4
5
6
7
8
15
16
17
18
19
20
21
26
27
28
29
30
33
34
35
36
37
38
39
40
41
42
47
48
49
50
51
52
53
54
55
56
57
58
61
66
67
68
69
70
71
72
73
74
75
76
77
78
81
82
83
84
85
86
87
88
89
90
91
92
95
96
97
98
99
100
12
14
62
64
43
44
23
22
24
25
11
65
10
32
46
60
79
93
13
63
9
31
45
59
80
94
IO
IO
IO
IO
IO
IO
IO
IO
IO
IO
IO
IO
IO
IO
IO
IO
IO
IO
IO
IO
IO
IO
IO
IO
IO
IO
IO
IO
IO
IO
IO
IO
IO
IO
IO
IO
IO
IO
IO
IO
IO
IO
IO
IO
IO
IO
IO
IO
IO
IO
IO
IO
IO
IO
IO
IO
IO
IO
IO
IO
IO
IO
IO
IO
IO
IO
IO
IO
IO
IO
IO
IO
IO
IO
IO/GCLK0
IO/GCLK1
IO/GCLK2
IO/GCLK3
IO/DEV_OE
IO/DEV_CLRn
TDI
TMS
TCK
TDO
GNDINT
GNDINT
GNDIO
GNDIO
GNDIO
GNDIO
GNDIO
GNDIO
VCCINT
VCCINT
VCCIO1
VCCIO1
VCCIO1
VCCIO2
VCCIO2
VCCIO2
/INT3
MMOSI
R5 100R
R19 3K00
R8 10K0
/INT0
R17 3K00
R14 10K0
R16 3K00
R9 10K0
P60
JTAG-DSP
1 2
3 4
5 6
7 8
9 10
11 12
13 14
/DSPRST
MMISO
C24
22 pF
R1 33R
SMOSI
C13
10 pF
FSX2
CLKX2
/DSP2BUSYA
DX2
/CSDSP2
/RST2
/SPIBOOT2
/DACCS
DSP2DATA
DSP2DATAA
/ENC2
MOSI
MISO
SCK
MMISO
/ADCCS
MMOSIA
MSCKA
MSCK
MMOSI
DR2
FSR2
CLKR2
AUXDSPD0
AUXDSPD1
5
5
4
4
3
3
2
2
1
1
D D
C C
B B
A A
NOTES:
PCB Revision A
2004051101 A0
K3 Aux DSP: IF Buffer
Elecraft, Inc. Copyright (C) 2007 - 2010.
L Johnson
A
45Wednesday, June 16, 2010
Title
Size Document Number Rev
Date: Sheet of
+8V
+8V
R26 909R
C40 1000 pF
R25 3K00
+
C43
10 uF/25V C37
2700 pF
C38
0.1 uF
+
-
Vocm
EN
U8
OPA1632D
8
1
4
36
5
2
7
+
C42
10 uF/25V
R23 51R
+
C35
10 uF/25V
R27 3K00
R22 51R
R24 909R
C41 1000 pF
+
C34
10 uF/25V
RX2_IF-
RX2_IF+
RX2_BIF+
RX2_BIF-
5
5
4
4
3
3
2
2
1
1
D D
C C
B B
A A
PCB Revision A
NOTES:
2004051101 A0
K3 Aux DSP: Power
Elecraft, Inc. Copyright (C) 2007 - 2010.
L Johnson
A
55Wednesday, June 16, 2010
Title
Size Document Number Rev
Date: Sheet of
VCC3AVCC3
VCC2
VCC3
VCC3
+8V
VCC2VCC3
C25
0.1 uF
C21
0.1 uF
TP2
GND
1
2A
B
C22
0.1 uF
C2
0.1 uF
C31
0.1 uF
C28
0.1 uF
C5
0.1 uF
C17
0.1 uF
+
C32
10 uF/25V
TP1
GND
1
2A
B
C11
0.1 uF
C10
0.1 uF
C7
0.1 uF
C1
0.033 uF
C12
0.1 uF
+
C36
10 uF/25V
C19
0.1 uF
TP3
GND
1
2A
B
C23
0.1 uF
C4
0.1 uF
C20
0.1 uF
C18
0.1 uF
C39
0.1 uF
L1 100 uH
C14
0.1 uF
C3
10 uF 10v ECJ
C33
0.1 uF
C29
0.1 uF
C26
0.1 uF
C27
0.1 uF
U1
LP3982
2 1
7
8
4
5
3 6
IN OUT
SHDN
FAULT
OUT
ADJ
GND CC
C16
0.1 uF
C15
0.1 uF
C6
0.1 uF
C9
0.1 uF
C30
0.1 uF
W. Burdick
Elecraft
Rev. Sht. DateBy
2 of 2
1 2 3 4 5 6
P2
10
11
12
1
2
3
4
5
6
7
8
9
P1
K1B 5
6
7K1A
4
3
2
C5
.01
R3
24.9
C4
TBD
3
4
5
6
1
2
T1
3-dB Splitter
C2
.047
C1
.047
L3
100
7T
7R
KRX3
RF Board
ANT
MAIN BPFS
K1
SUBIN Module
D1
64-05
D2
64-05
7T
7R
SUB BPFS
L1
100
L2
100
R1
220
R2
220
/SPLIT
C3
.047
C6
.01
1
8
C7
.01
D16
BAT54S
B2 9/18/08
W. Burdick
Elecraft
Rev. Sht. DateBy
2 of 2
10 11 121 2 3 4 5 6 7 8 9
P1
C1
0.1
/2OE
/3OE
/4OE
/1OE
GND
VCC
2A
4A
3Y
3A
4Y
2Y
10
11
12
13
14
1Y
1A
8
9
1
2
3
4
5
6
7
U1
74LCX125
RF Board
10
11
12
13
14
1
2
3
4
5
6
7
8
9
P2
12A
LD_BPF_S
LD_BPF_SB
SCK3S
MOSI3S
MOSI3SB
MISO3
LD_IF_S
LD_IF_SB
RX2_IF-
RX2_IF+
OUT
GND
IN
U2
KRX3
78L05
SUBOUT Module
R2
100
IFGAIN2
R1
100
SCK3SB
HAGC2
B2 8/18/08
P44E
1 2 3
P44C
1 2 3
W. Burdick
Elecraft
Rev. Sht. DateBy
Appendix B
40 40
40 40
27
C120 C157
C144
K6A K6B
C86
C154
C126
C174 C188
C182
K8A K8B
C149
C181 C185
C136
C78
C79 C84
150
560 560
150
470
39
2
39
470
220
2
220
K1A K1B
C81
1300
C82
1300
K7
L18
2
4
3
9
7
8
2
4
3
9
7
8
2
4
3
9
7
8
2
4
3
9
7
8
1
2
3
4
5
6
P44A
5SA
SCK3SB MISO3S
K6
K5
K8
K9
K3
1
K1
1
10
SRCK
SOUT
/CLR RCK
SIN
VCC
/Q0
/Q1
/Q2
/Q3
/Q7
/Q6
/Q4
/Q5
GND
10
15
14
13
12
11
16
/G 9
2
3
1
4
5
6
7
8
U4
SCK3SB
.01
C165
C163
C164
C108
C75
C160
C90
TPIC6C595D
K7
K4
1
10
SRCK
SOUT
/CLR RCK
SIN
VCC
/Q0
/Q1
/Q2
/Q3
/Q7
/Q6
/Q4
/Q5
GND
10
15
14
13
12
11
16
/G 9
2
3
1
4
5
6
7
8
U2
SCK3SB
C111
C191
5SA
TPIC6C595D
Band-Pass Filters
40
C180 40
C184
L13
1.0
L12
1.0
L11
1.0
40
C135 L10
1.0 40
C134
40 40
40 40
C119 C156
C143
K3A K3B
C153
C125 C146
C179 C183
C133
1000
100 5
100
1000
K4
2
4
3
9
7
8
24
3
9
7
8
L9
4.5
40
C132
L8
4.5 40
C131
C118 C155
K5A K5B
C152C124
820
120 120
820
2
4
3
9
7
8L7
1.0
40
C130
L6
1.0
40
C129
C142
5
C123
100 C122
100
C117
56
C116
56
L5
4.5
L4
K2A
24
3
K2B
97
8
C173
1500
90
C178
C172
1500
90
C177
L3
0.25 L2
0.25
L1
0.25
C141 3.9 C140 3.9
K9A
2
4
3
K9B
9
7
8
20
C128
20
C148
C139 33
C187
100
20 C147
C138 33
C186
100
.01
C190
(Attn., SH. 2)
K10
C93
BPF_IF
BPF_RF
C223
22
Aux. BPF
K2
.01
C240
C236
.047
C61
.047
6 m
10/12 m
15/17 m
20/30 m
80/160 m
40/60 m
C189
.01
(80) (80)
(160) (160)
(10/12 m)
(15/17 m)
(40/60 m)
(20/30 m)
(6 m)
(80/160 m)
(80 or 160 m)
(17/10 m or 15/12 m)
(60/20 or 40/30 m)
(60/20)
(40/30)
(17/10)
(15/12)
L16
1.2
1812?
C1
390
LD_BPF_SB
LD_BPF_SB
RFC49
12SA
12SB
MOSIBPF1_S
.01
C274
22
KRX3 Sub Receiver
1 of 2
BPF_IF2
BPF_IF2
MOSI3SB
C50
.047
J92
(W23)
K11
5
6
7
Q2
OUT
GND
IN
U8
BC807
78L09
/12S_ON
C42
1µF
9SA
C32
1µF
MOSIBPF2_S
AUX RF
43
2
/MISO3S
RFC2
22
12SC
C51
.047
SA1
R50
10K
5SA
1 2 3 4 5 6
J64C SUBIN
TS5A3166
GND
COM
V+
IN
NO
1
2
3 4
5
U6
5SA
5V = LINK NB1-2
10
11
12
13
14
1
2
3
4
5
6
7
8
9
J64D LD_IF_SB
MOSI3SB
VIFGAIN2
MISO3S
SCK3SB
LD_BPF_SB
SUBOUT
CB Z1 CA
CF Z3 CE
CK Z5 CJ
CP Z7 CN
CU Z9 CT
CD
Z2
CC
CH
Z4
CG
CM
Z6
CL
CS
Z8
CR
CW
Z10
CV
R2
C60
100
R3
R4
OUT
GND
IN
U5
78L05
5SA
100
L33
11.5
8.2MHz
TRAP
11
C218
C71 24
10K
1.8K
C65
10µF
R12
470K
D1
BAT54S
C63
2
Q5
BCV27
.01
C57
R14
470K
RF SENSE
CY
.01
Z11
CX
.01
1
8
K11
/MAIN RF SEL
RF SENSE
C.O.R.
/SPLIT
C17
100
R13
100
HAGC2
R8
100
R9
100
RX2_IF-
RX2_IF+
R51 TBD
5SA
12SA
/12S_ON
C52
.01
P89
1 2 3
/NB2 (via W5)
/NB1 (via W6)
5SC
12SA 5SC
D2
BAV99
B2 8/18/08
12SA
12SB
(Not on rev B PCB)
W. Burdick
Elecraft
Rev. Sht. DateBy
Appendix B
NE46134
150
C204C202
C195
R60
R75
6.2Ω
R66
.047
100 68 100
Q8
.047
R45
R37 R43
.047
15
C211 .047
12SA
SCK3SB
MISO3S
MOSINB2
LD_IF_SB
RFC39
47 µH
12SA
5
67
+
-
U1B
3
2
1
+
-
8
4
U1A
14
2.7K
RP1
3
C201
.047
C215
150
33KR42
12
C214
1µF C200
0.01
C213
150
33KR41
2.7KRP1
1 6
C212
1µF C199
0.01
64-04
D22
64-04
D21
RFC27
100
D33
T5
4
3
1
2
G
D
S
Q1
C47
R30
R29
R26
C44
R25
C43
RFC25
22
RFC24
100
C40
C39
J309
C198
220µF 100
R39
+
.047
.047
.047
100
.047
22
1.2K
0V = MAX GAIN, 3V = MIN
LM833
R23
560
R21 100
C12
C11
RFC20
RFC18
R19 100
C10
C9
RFC17RFC16
R18 100
C8
C7
RFC15RFC14
R17
100 C6
C5
RFC13
RFC12
R16
620
Crystal Filters
FL4
FL3
FL2
FL1
1 2 3 4 5
Z12
1st Mixer
620
R63
Preamp
NE46134
220
470
C209
R67
R59
R62
R74
18
.047
R65
Q4
15
18
C210
.01
1.2K
R61
2
43
97 8
K10
Attn. C15 C16
RFC6
100
RFC8
100
PRE_OFF
C26
15
R20 100
C14
C13
RFC21RFC19
C203
.047
R68
8.2Ω
FL5
C41 C4
R69
470
RFC4
100
R1
470
C208
.047
C193
.047
RFC37
100
-10 dB T6
4
2
3
1
.047
C21
15
D17
D18
C25
15
D15
C24
15
D13
C23
15
D11
C36
22
C22
22
D20
64-04
D19
C29
22
D16
C28
22
D14
C27
22
D12
D4
D3
64-05
12SA
C228
.047
RFC41 100
C233
.047
PRE_ON
Q9
R56
8.2Ω
RFC5
100 µH
.047
C229
.047
RFC42
100
C232
.047
6T
LOAD
DOUT
/OE
GND
VDD
DIN
SCK VBB
Q10Q7
Q6
Q1
Q5
Q8
10 11
12
Q3
13
Q2
14
15
16
NC NC
Q4
17
18
19
Q9 20
1
2
3
4
5
6
7
8
9
U10
A6810
SCK3SB
LD_IF_SB
5SA
R82
R78
R79
R81
R80
MOSINB2
MOSI3SB
PRE_ON
PRE_OFF
.047
.047
2.7K
RP1
51
(not used)
C237
.047
RX2_IF-
RX2_IF+
C4-C14 = .047 µF
RFC12-RFC21 = 100 µH
R7
1.8K 51
V-
V+
1
2
3
5
4
67
8
U9
C249
1µF
SA612
J82
2NDLO
C20
.01
R10
390
C251
.047
FL4
FL5
FL1
FL2
FL3
C255
.047
C254
.047
C253
.047
C252
C56
0.1 2nd RX
Mixer
P45A
P46A
P47A
P48A
P49A
P45B
P46B
P47B
P48B
P49B
C262
.01
I.F. Amp
16:5
8.230 MHz
R64
620
W2
1234
P45C
1234
P46C
1234
P47C
BW3
BW2
BW1
C34
.047
KRX3 Sub Receiver
2 of 2
R78-R82 = 100
BW1
BW3
BW2
W3
9SA
9SA
9SA
J85
1STLO
9SA
FL5
FL4
FL3
FL2
FL1
64-04
10 11 121 2 3 4 5 6 7 8 9
J78
Noise Blanker
OUT
GND
IN
U11
78L05
12SC
FL3/4/5 BW Q3
R5
10K
R6
2N7002
C19
.01
R11
10K
L38
2.8
C285
150
C30
120
L39
2.8
C48
27
X1
BW = 14 kHz
L36
18
X2
C49
10
L37
27
C18
0
C196
.01
C197
.01
D29
BAV99
D30
C238
0.1
R86
4.7M
5
6
7+
-
8
4
U3A
TLV2462 HAGC Det.
3
2
1
+
-
U3B
VIFGAIN2
BAV99
D38
470K
R85
D32
R102 1.8K
D40
HAGC2
XF1
XF2
P86A
1 2
12SD
12SD
C2
0.1
5SB
W1
BPF_IF
W4
OUT
GND
IN
U7
78L09
12SC
C3
0.1
9SB_1
C205
100
12SA Q4E
PREBYP
L35
11.5
TRAP
11
C257
C258
24
Q89B
Q89E
P86B
1 2
J93
9SB
IF1
IF2
M2
M1
G1G2
G3
C37
3.3µF
C38
3.3µF
**
*Not present on rev A PCB.
B2 8/18/08
C:\Projects\K144XV\Schematics\KXV144_8B.sch - Sheet2
