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
st
Band Stop Filter 1
Mixer High dynamic range 1
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 2
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
IF rejection
st
mixer
nd
Mixer
Copyright © 2007‐ 2010, Elecraft, Inc. All Rights Reserved.
101112131415161718192021222324252627282930313233343536
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J76
KIO3
P4 4 E
1 2 3
P4 4 C
1 2 3
SPK R_R
SPKR_L
AUXBUS
RXD
TXD
/KEY_IN
/PT T_I N
W. Burdick
Elec raft
Rev. Sht. Date By
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
2 439
7
8
J12
J15
Key Out
J14
PTT In
P a d d l e
FSK IN
XVTRON
12345
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
C156 K3A
K3B
C153
C125
C146
C179 C183
C133
1000
100
100
1000
K4
2
4
3
9
7
8
2 439
7
8
L9
4.5
40
C132
L8
4.5
40
C131
C118
C155
K5A
K5B
C152 C124
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
2
4
3
K2B
9 7
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
IR FI 63 0
G
D
S
R4
10K
RFC4
100
RFC3
RFC2
RFC1
/DASH
/DOT
/KEY_IN
/PT T_I N
C74
C107
C92
.001
C89
20
C148
C139
33
C187
33
20
C147
C138 33
C186
100
.01
C190
(Attn., SH. 4)
K10
C93
LI NE_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)
(1 60)
(1 60)
(10/12 m)
(15/17 m)
(40/60 m)
(20/30 m)
(6 m)
(80/16 0 m)
(80 or 160 m)
(17/10 m or 15/12 m)
(60/20 or 40/30 m)
(6 0/ 20)
(4 0/ 30)
(1 7/ 10)
(1 5/ 12)
L16
1.2
C1
390
Q5
2N700 2
G
D
S
7R
100
C251
J13
Key
RFC49
12A
12B
12B
12B
12B
MOSIBPF1
.01
C274
.015
C275
250V
12B
10
BPF_I F2
BPF_I F2
R28
100
LD_BPF
LD_BPF2
LD_BPF2
P4 4A/C/ E
101112
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J64A
Sub Rcvr
7R
7T
BPF _RF
W4
SUB RX BYP
(Sh. 2)
C50
24
13245
Z3
St op - Ba nd Filter
W30 W31
W32
W33
RFC36
100
R72
470
L35
11.5
8.215 MHz
11
C257
C71
24
BP F_IF
W15
RF CHOKE RFC53 & C143 MOD
B2
1/8 /10
82 RFC53
(C143 on rev A PCB)
* = Recent Change s
*
VI P A
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 /RS CL
7R
7T
SWR Bridge
100
RFC31
C260
0.1
100
R51
100
R50
7T
7R
R44 R35
51 51
W2
W1
XV
RX A
150
R57
100
RFC30
Relays
LPF
K12
K11
K15
K16
K17
K13
1
16
BPF _RF
SCK3
MISO3
V12S PA
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
MOS IPA
5A
/FSCL
/RS CL
470
R49
2 of 4
10 11 12 13 14 15 16 1 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
1 2 3 4 5
P 7 1A
1 2 3 4 5
P 7 1C
10 1 2 3 4 5 6 7 8 9
P 7 1 B
Z2 LPA
C261
2200
100
RFC45
51
R48
5
6
7
+
-
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
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P67A
100 W PA In
7R
7T
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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
P70
ATU
12B
W19
C264
.047
1.0
C268
C267
0.1
C266
.01
C269
LD_LPF
MOS IPA
12B
SCK3
MISO3
LD_ATU
SCK3
W21
W20
BYP
7R
12A
P7 2
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
K13 B
K13A C151
C168
C176
C114
C121
C137
C85
C97
C103
C95
C101
C159 C170
C115 C127
C113
C105
K14 B
K14A
L19
L21
L27 L30
L25 L26
L23
11
9
13
6
8
4
6
8
4
11
9
13
C73
C77
C80
K11 B
K11A
L14 L17
6
8
4
11
9
13
C83
C96
C102
C88
C100
C110
C104
K15 B
K15A
L20
L22
L24
6
8
4
11
9
13
Elec raft
Rev. Sht. Date By
C145
C162 C 171
L29 L32
K18
K12 B
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
C70
0.1
C67
0.1
D31
4007
RFC32
5.6
D27 D26 MA4 P
R58
220
C72
2200
RFC33
50
T-R
Switch
E1
Ground
/PT T_I N
/DOT
/DASH
/KEY_IN
/CSRFMUX
ADR0
ADR1
ADR2
ADR3
MOSI
VRFADC
FCT
RXD
TXD
XVTRON
/SPI _23_ EN
1 2
J10
J11
12V Out
12V In
D34
1N400 7
D6
SB53 0
F1
6A
FDS6375
Q2
G
D
S
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
/CSP LL2
/CSP LL1 /CSDDS2
/CSDDS1
LD_I F_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
VDD CH4
CH7
CH3
CH0
10
11
12
13
14
15
16
B
A
C
1
2
3
4
5
6
7
8 9
U6
V12S PA
VRFADC
VTPA
VI P A
4051
R12
R11
MISO2
MISO3
2.7K
C66
.01
C54
.01
VI_L O
2.7K
VIFGAIN2
1011121314151617181920
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J73
Synth 1
8A
/CSP LL1
/CSDDS1
5A
LD_SYN1
1011121314151617181920
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J74
Synth 2
8A5ALD_SYN2
/CSP LL2
/CSDDS2
MOSI2
MISO2
SCK2
MOSI2
MISO2
SCK2
1011121314151617181920
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P50
DSP A.F. I/O
1011121314151617181920
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P51
DSP I.F. I/O
RX 1_ IF -
VIFGAIN1
100HZ
RX 2_ IF -
VIFGAIN2
VREFL
RX1_IF+
TXIF+
RX2_IF+
VFWD
BK_PH _R
LINEOUT_L
BK_MICAF+
SPKR_L
SPK R_R
BK_PH_SW
LINEOUT_R
BK_ MICAF -
FSK IN
TXIF-
C58
470µF
+
MC7805ACT
MC7808ACT
C57
470µF
+
C56
220µF
+
LINE_ IN+ LI NE_IN -
ZXTC1010
LOAD
IOUT
GND
VIN
NC
123
4
5
U1
R36 0.05 Ω
VI_L O
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_I F_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
Q10 Q7
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
RX 2_ IF RX2_IF+
5A
C69
.047
VPLL2
VPLL1
10
1
2
3
4
5
6
7
8
9
P 7 9
CPL D 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
10 11 12 1 2 3 4 5 6 7 8 9
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
78L0 9
C45
10µF
12A
LD_BPF_S
LD_BPF_S
+
12A
Q11
10K
R27
BC807
1µH
C35A
(not used)
9V
R98
10K
R99
10K
5A
R10 0
1K
D35
1N400 7
F2
0.6A
W34
1/8 /10 B2
*
* = Recent Change s
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
1 2 3 4 5
P35
AUXBUS
Front Panel
10 11 12
13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 1 2 3 4 5 6 7 8 9
P30
Appendix B
Elec raft
W. Burdick
K3 RF Board
Rev. Sht. Date By
SCK3
MISO3
MOSINB
LD_IF
RFC39
47 µH
NB1LVL
12A
5
6
7
+
-
U15B
3
2
1
+
-
8
4
U15A
1
4
2.7K
RP 1
3
C201
0.1
C215
51
33K R42
6.2 Ω
R33
1
2
C214
1.0 µF
C200
0.01
C213
51
33K R41
6.2 Ω
R40
2.7K RP 1
1 6
C212
1.0 µF
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
J3 09
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
RFC17 RFC16
R18 100
C8
C7
RFC15 RFC14
R17
100
C6
C5
RFC13
RFC12
R16
620
RFC11
100
Crystal Filters
FL4
FL3
FL2
FL1
VCO1
1 2 3 4 5
Z1
560
R63
Preamp
NE461 34
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
4
3
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
RFC21 RFC19
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
132
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
RP 1
5 1
(not used)
8A
C237
.047
G
S
D
Q10
J3 09
C55
.01
R8
13K
RFC22
100
R9
220
C68
.047
C59 .047
7R
RX 1_ IF -
RX1_IF+
C4-C14 = .047 µF RFC 12-R FC21 = 100 µH
R7
1.8K
51
8A
C196
.01
C197
.01
D29
BAV99
D30
C238
0.1
R86
4.7 M
HAGC1
3
2
1
+
-
8
4
U3A
V-
V+
1
2
3
5
4
6
7
8
U9
C249
1.0 µF
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
Mi xer
(W14)
P45A
P46A
P47A
P48A
P49A
P4 5B
P4 6B
P4 7B
P4 8B
P4 9B
C262
.01
I.F. Amp
C38
.01
R6 300
R3 300
R24 18
8.230 MHz
(W7)
8.215 MHz
R64
620
W17
W18
1 2 3 4
P45C
12B
1 2 3 4
P46C
1 2 3 4
P47C
BW3
BW2
BW1
RFC7
100
7T
C273 .047
W16
W22
Post-amp
(Not on rev. XA PCB.)
F L5
F L4
F L3
F L2
F L1
10 11 12 1 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 Cont rol
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
BP F_IF
470K
R85
D32
Not on Rev A PCB
XF1
R10 2 1.8K
D40
R101 on Rev A PCB
Not on Rev A PCB
B2 1/ 8/1 0
VPOST
*
* = Recent Change s
*
*
R45
100
R43
68
R37
100
C202
.047
12A
R60
150
C195
.047
R66
C211 .047
15
Q8
C204
.047
NE461 34
R75
6.2Ω
Elec raft
Appendix B
W. Burdick
K3 RF Board
Rev. Sht. Date By
C:\Elecraft\Henry\Modules\Beta\BSF\Schematic\BSF.sch - Sheet1
C:\Projects\K3\Schematics\KR MixerRevXC.sch - Sheet1
C4 C5
X2 X3 X4
C6 C3
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
1 2
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. Date By
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
4
3
2
1
P76
1
2
3
D D
C C
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
RF Board
B B
+12SW
/RSPKEN
SPKR_L
SPKR_R
ALC
BK_PH_SW
BK_PH_R
BK_PH_L
LINEOUT_L
LINEOUT_R
BK_MIC_AF+
BK_MIC_AFLINE_IN+
LINE_IN-
DIG0
DIG1
/KEY_IN
/PTT_IN
MOSI_3
MISO_3
LD_IO
+8R
+8T
TXD
+12SW
RXD
+12UNSW
AUXBIUS
/PWR_ON
K1
3
8
1
10
DPDT
U6
VCC5
R23
100R
MOSI_3
LD_IO
2
SDI
15
SCK
7
SCLR
10
RCK
8
OE
1
VCC
16
GND
Q0
Q1
Q2
Q3
Q4
Q5
Q6
Q7
SDO
3
4
5
6
11
12
/RSPKEN
13
14
9
DIGOUT0
DIGOUT1
BAND0
BAND1
BAND2
BAND3
Q3 MMBT3904
2 3
R8 1K
/PTT_IN
TPIC6C595D
+12SW
VCC5
2
4
R25
470R
C28
100 pF
LD_IO
C27
0.1 uF
2
15
7
10
8
1
16
U5
SDI
Q0
SCK
Q1
SCLR
Q2
RCK
Q3
OE
Q4
Q5
VCC
Q6
Q7
GND
SDO
TPIC6C595D
DCTRL0
3
DCTRL1
4
DCTRL2
5
DCTRL3
6
11
12
MICBIAS
13
14
9
3456789 10
VCC5
9
1 2
1
RP2 10K
nKEYOUT
3
Q7
MMBT3904
7
+8R
R18 10K
3
Q8
1
MMBT3904
R16
2
10K
1
Q5 MMBT3904
2 3
1
Q4 MMBT3904
2 3
1
Q6 MMBT3904
2 3
1
RP1A 100K
1 8
RP1C 100K
3 6
R12 1K
RP1B 100K
2 7
RP1D 100K
4 5
RTSA
DTRA
/KEY_IN
2
Sheet 2
Sheet 3
MICBIAS
BK_PH_SW
DIGOUT0
DIGOUT1
BAND0
BAND1
BAND2
BAND3
/PTT_IN
RTSA
DTRA
nKEYOUT
/PWR_ON
AUXBUS
DIG1
DIG0
LINE_IN-
LINE_IN+
BK_MIC_AF-
BK_MIC_AF+
LINEOUT_R
LINEOUT_L
BK_PH_L
BK_PH_R
SPKR_RSW
SPKR_L
RXD
TXD
ALC
R26
MT1
1
A A
Mounting Holes for
KIO3 Faceplate
MT2
+
VCC5
C14
0.1 uF
2
Elecraft, Inc. Copyright (C) 2007 - 2010.
L Johnson
Title
KIO3 Main
Size Document Number Rev
Date: Sheet
2005042501 C
B
1
13 Wednesday, June 16, 2010
of
1
TP1
1
A
2
B
+12SW
GND
C16
0.1 uF
5
4
U3
1
+VIN
OUT
2 4
GND TAB
UA78M08CDC
3
C8
10 uF/25V
+
VCC8A
C15
0.1 uF
+12SW
C22
0.1 uF
3
U2
1
+VIN
OUT
2 4
GND TAB
UA78M05CDC
3
C11
10 uF/25V
470R
5
4
3
2
1
+12SW
RXD
D D
RXD
C12
1000 pF
L1 100 uH
C4
1000 pF
+
C9
100 uF/16V
3 2
R1 1K
Q2
2N7002K
1
R2
1K
3
2
R6
Q1
MMBT5089
1
10R
R3
10K
Approximately 1 kHz
R5
2.7K
C7
0.01 uF X7R
C3
0.01 uF X7R
C5
U1
TXD
C C
TXD
VCC5
14
12
10
15
13
11
16
T1in
T2in
T3in
R1out
R2out
R3out
VCC
T1out
T2out
T3out
R1in
R2in
R3in
V+
3
5
7
RTSA
DTRA
2
4
6
1
VCC8A
C1
0.1 uF
8 9
V- GND
1 uF/16V
RTSA
DTRA
D1
1 3
R4 27K
R7 27K
C6
0.022 uF X7R
LT1039ACN
2
C33 1000 pF
C2
0.1 uF
+
C10
33 uF/16V
BAT54S
DTR_X
TXD_X
RTS_X
C29
1000 pF
0
B B
BAND0
BAND3
BAND2
nKEYOUT
/PWR_ON
ALC
/PTT_IN
BAND1
AUXBUS
DIG0
DIG1
1
DIGOUT0
DIGOUT1
BAND0
BAND3
BAND2
nKEYOUT
/PWR_ON
ALC
/PTT_IN
BAND1
AUXBUS
DIG0
DIG1
DIGOUT0
DIGOUT1
C30
1000 pF
C31
1000 pF
C32
1000 pF
RXD_X
VCC5
10
11
12
13
14
15
16
17
18
19
20
J90
1
2
3
4
5
6
7
8
9
RS232 COM
RS232 DTR
RS232 TXD
RS232 RTS
RS232 RXD
ACC COM
ACC BND0
ACC BND3
ACC BND2
ACC KEY
ACC PWR
ACC ALC
ACC PTT
ACC BND1
ACC AUX
ACC DI0
ACC DI1
ACC DO0
ACC DO1
+5V
D-Sub IO Board
Elecraft, Inc. Copyright (C) 2007 - 2010.
A A
L Johnson
Title
KIO3: Main, Sheet 2
C41
1000 pF
C42
1000 pF
3
C43
1000 pF
C44
1000 pF
Size Document Number Rev
A
Date: Sheet
2005042501 C
23 Wednesday, June 16, 2010
2
of
1
5
C13
1000 pF
C34
1000 pF
C35
1000 pF
C36
1000 pF
C37
1000 pF
4
C38
1000 pF
C39
1000 pF
C40
1000 pF
5
4
3
2
1
TALT3
4 5
TALT2
4 5
D D
LINEOUT_R
LINEOUT_R
R20
T2
1 6
1 8
LM-NP-1001
1 8
LM-NP-1001
LINEOUT_L
LINEOUT_L
51R
R19
3 4
TTC-108
T3
1 6
LINEJACK_COM
LINEJACK_L
51R
C24
1000 pF
C C
LINE_IN+
LINE_IN+
C23
1000 pF
3 4
TTC-108
T1
1 6
R24
R13 604R
BK_PH_R
BK_PH_L
BK_PH_R
BK_PH_L
62R
LINE_IN-
MICBIAS
LINE_IN-
MICBIAS
C20
1000 pF
RP3A
1 8
2 7
C25
1000 pF
RP3B
10K
1
VCC8A
2 3
Q9
3 4
TTC-108
TALT1
4 5
1 8
LM-NP-1001
C18
1000 pF
BK_PH_SW
C45
0.1 uF
BK_PH_SW
C46
0.1 uF
C47
0.1 uF
SPKR_RSW
SPKR_L
R10 2.7R
R9 2.7R
R11 2.7R
SPKR_RSW
SPKR_L
MMBT3906
R21
10K
10K
R22
10K
B B
BK_MIC_AF+
BK_MIC_AF-
BK_MIC_AF+
BK_MIC_AF-
VCC8A VCC8A
U4A
LM833D
8 4
3
A A
1
+
2
-
C26 470 pF
5
R14 5.6K
C17
10 uF/25V
R17
10K
U4B
LM833D
8 4
7
+
-
C21 470 pF
4
+
P25
1
2
INT SPKR
R15
This resistor sets gain of mic preamp.
10K
VCC8A
C48
3 6
1000 pF
C49
1000 pF
C50
1000 pF
C51
1000 pF
C52
0.1 uF
RP3C
10K
J91
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
Audio IO Board
SP L
SP L S
SP C
SP R
PH SW1
PH R
PH SW2
PH L
PH C
MIC C
MIC A
LIN C
LIN L
LOUT C
LOUT R
LOUT L
5
6
C19
1 uF
RP3D
10K
4 5
3
2
Elecraft, Inc. Copyright (C) 2007 - 2010.
L Johnson
Title
KIO3: Main, Sheet 2
Size Document Number Rev
Date: Sheet
2005042501 C
B
1
33 Wednesday, June 16, 2010
of
5
4
3
2
1
LINEJACK_R
LINEJACK_L
LINEJACK_COM
D D
SP L
SP L S
SP L C
SP R
PH SW1
PH R
PH SW2
C C
PH L
PH C
MIC C
MIC A
LIN C
LIN L
LINE C
LOUT R
LOUT L
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
KIO3
B B
L13 BEAD
L14 BEAD
L16 BEAD
L12 100 uH
L11 100 uH
L10 100 uH
L9 100 uH
L6 100 uH
L5 100 uH
L4 100 uH
L3 100 uH
L2 100 uH
L1 100 uH
C1 1000 pF
C2 1000 pF
C3 1000 pF
R2
2.7R
R1
2.7R
P91
LIN_LX
LIN_CX
MIC_A
PH_R
PH_L
PH_SW1
C4
C5 1000 pF
C9 1000 pF
C12 1000 pF
C10
0.1 uF
0.1 uF
C11
0.1 uF
C8
0.1 uF
C6
0.1 uF
C7
0.1 uF
SPK_R
SPK_LS
SPK_L
SPK_LC
2
J22
4
5
1
2
LINE OUT
J21
4
5
1
2
LINE IN
J20
4
5
1
MIC
6
1
3
4
5
J19
PHONES
7
8
2
J18
4
5
1
SPEAKERS
Elecraft, Inc. Copyright (C) 2007 - 2010.
A A
L Johnson
Title
KIO3: Audio IO Board
Size Document Number Rev
A
2005042501 A
5
4
3
Date: Sheet
2
11 Wednesday, June 16, 2010
of
1
5
4
3
2
1
D D
R13 220R
R12 220R
L3 100 uH
L2 100 uH
RXD_X
RTS_X
TXD_X
DTR_X
SER_C
J24
RS232
11
10
1
6
2
7
3
8
4
9
5
DE9 PIN FUNCTION DIRECTION
2
7
3
4
5
RXD_OUT
RTS_IN
TXD_IN
DTR_IN
COMMON
--->
<--<---
<---
Frame Ground
C7
1000 pF
C C
P90
RS232 COM
RS232 DTR
RS232 TXD
RS232 RTS
RS232 RXD
ACC COM
ACC BND0
ACC BND3
ACC BND2
ACC KEY
ACC PWR
ACC ALC
ACC PTT
ACC BND1
ACC AUX
ACC DI0
ACC DI1
B B
ACC DO0
ACC DO1
+5V
KIO3
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
R3 2.2K
R4 2.2K
R5 2.2K
R8 2.2K
R7
69.8K 1%
L4 100 uH
R14 220R
R15 220R
R16 220R
R17 220R
R18 220R
R1 137K 1%
R19 220R
R20 220R
R21 220R
R2 220R
R9 220R
R10 220R
R11 220R
R6
100K 1%
C10
1000 pF
C12
1000 pF
C11
1000 pF
C4
1000 pF
C13
1000 pF
C14
1000 pF
C3
1000 pF
C16
1000 pF
C17
1000 pF
C9
1000 pF
C1
1000 pF
C5
1000 pF
C8
1000 pF
C2
1000 pF
C15
1000 pF
C6
1000 pF
J23
ACC
DIGO_X
DIGO1_X
DIG0_X
DIG1_X
AUX_X
PWR_X
BND0_X
BND1_X
BND2_X
BND3_X
PTT_X
KEY_X
ALC_X
6
11
1
7
12
2
8
13
3
9
14
4
10
15
5
16
17
Frame Ground
ACC PIN FUNCTION DIRECTION
6
11
1
7
12
2
8
13
3
9
14
4
10
15
5
DIG_OUT_0
DIG_OUT_1
FSK IN
XVTR_ON
COMMON
AUXBUS
PWR_ON
BANDOUT_0
BANDOUT_1
BANDOUT_2
BANDOUT_3
PTT_IN
KEYOUT_LP
ALC_IN
COMMON
--->
--->
<---
--->
<-->
<---
--->
--->
--->
--->
<---
--->
<---
A A
Elecraft, Inc. Copyright (C) 2007 - 2010.
L Johnson
Title
KIO3: D Sub RS232 IO Board
Size Document Number Rev
5
4
3
2
Date: Sheet
2005042501 B.1
B
of
1
11 Wednesday, June 16, 2010
W. Burdick
Elecraft
Rev. Sht. Date By
1 of 1
SA1
J69A
To J7
R1
560K
(ANT1)
10
11
12
13
14
15
16
17
18
19
20
123456789
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.
1 2
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. Date By
1 of 1
V-
V+
1
2
3
4
5
6
7
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
1 2 3 4 5 6 7 8
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
1 2 3 4 5 6 7 8
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
(no t use d)
L6
50 µH
2N390 4
Q3
R21
12
12T, FT3 7-43
1011121314151617181920
123456789
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
10 11
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
C19 0.1
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
MU X
REF
CLK
CP
VP
LE
10
11
12
13
14
15
16
CE
1
2
3
4
5
6
7
8 9
U3
ADF4001
DDS
R12
10K
C50 120
5V
ZXCL300E5
GND
N/C
OUT IN
EN
1
2
3 4
5
U6
W. Burdick
Elec raft
Rev. Sht. Date By
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
L1 L2
39µH
39µH
100K
R17
2N390 4
Q6
R20
25.5
1K
R16
3V
L3
27 µH
100
R15
0.1
C47
/CSDDSB
/CSPLLB
MOSI2B
SCK2B
10K
R14
VPLL
1N414 8
100K
MMBV 109
J3 10
C33
C28
0.1
R32
R29
D8
Q1
D9
D10
22
10
G
D
S
VCO
C21
0.1
J3 10
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
7
5
6
2
4
3
K2
7
5
6
2
4
3
K1
7
5
6
2
4
3
K3
C4
2%
SCK2
/2OE
/3OE
/4OE
/1OE
GND
VCC
2A
4A
3Y
3A4Y2Y
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
2N390 4
Q5
R10
56.2K
1N571 1D6MMB D914
D5
C7
.01
R28
1.8K
8B
ALC
C6
1%
110
C5
30
L Select
1K R7
C3
30
D4
BA P64 -04
1K R6
C2
15
D3
1K R5
C1
7.5
D2
.01
C45
K1
K2
1
8
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
5
7 -
+
8
4
U5A
8B
3V
OP284
3
2
1
+
-
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
1K R18
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
4
3
2
1
MICBIAS
SWITCHES
D D
MAINENCA
MAINENCB
SUBENCA
SUBENCB
RITENCA
RITENCB
/ENC_EN
MISCENCMUX
VFPADCMUX
VFADCTAP
MAINENCA
MAINENCB
SUBENCA
SUBENCB
RITENCA
RITENCB
/ENC_EN
MISCENCMUX
VFPADCMUX
VFADCTAP
ADR[2:0]
ADR[2:0]
C C
SWITCHES
MCU
MAINENCA
MAINENCB
SUBENCA
SUBENCB
RITENCA
RITENCB
/ENC_EN
MISCENCMUX
VFPADCMUX
VFADCTAP
ADR[2:0]
LCDSCL
LCDDI
LCDCE
LCDMODE
VCONTRAST
MOSI
SCK
LOAD
VLEDBRT
VLCDBKLT
LCDSCL
LCDDI
LCDCE
LCDMODE
VCONTRAST
MOSI
SCK
LOAD
VLEDBRT
VLCDBKLT
LCD
LCDSCL
LCDDI
LCDCE
LCDMODE
VCONTRAST
LCD
LEDS
MOSI
SCK
LOAD
VLEDBRT
VLCDBKLT
MICBIAS
LEDS
MISCELLANEOUS
VR1REAR
VR1FRONT
VR2REAR
VR2FRONT
VMICBTN
/PTT MICBIAS
VR1REAR
VR1FRONT
VR2REAR
VR2FRONT
VMICBTN
/PTT
MISCELLANEOUS
J31
B B
1
2
3
4
5
6
7
8
9
10
11
12
13
MOSI
SCK
MISO
MUTE
/DSP1BUSY
/DSP2BUSY
VSMTR
/CSDSP1
/CSDSP2
/CSDSPLOAD
DSP1DATA
DSP2DATA
VR1REAR
VR1FRONT
VR2REAR
VR2FRONT
VMICBTN
/PTT
MISO
MUTE
/DSP1BUSY
/DSP2BUSY
VSMTR
/CSDSP1
/CSDSP2
/CSDSPLOAD
DSP1DATA
DSP2DATA
12V_UNSW
VPWR_SW
PWRHOLDON
/PWRON
12V_SW
V12MON
3VBATT
SCL
SDA
12V_UNSW
VPWR_SW
PWRHOLDON
/PWRON
12V_SW
V12MON
3VBATT
SCL
SDA
14
15
POWER
12V_UNSW
VPWR_SW
POWERHOLDON
/PWRON
12V_SW
V12MON
3VBATT
SCL
SDA
POWER
NOTES:
PCB Revision B
16
MCU
A A
FP-DSP
Elecraft, Inc. Copyright (C) 2007.
L Johnson
Title
Elecraft K3: Front Panel
Size Document Number Rev
A
Date: Sheet
5
4
3
2004070601 B,1
17 Tuesday, November 24, 2009
2
of
1
5
4
3
2
1
J36
D D
LCDMODE
LCDDI
LCDSCL
LCDCE
VCC5
1
2
3
4
5
6
OLED
R20 100K
LCDSCL
LCDDI
C C
LCDCE
LCDMODE
LCDSCL
LCDDI
LCDCE
LCDMODE
VCC5
R16
B B
10K0
L
VCONTRAST
R23
1K00
C38
+
10 uF/25V
1 3
D14
BAT54
1 3
+
C32
10 uF/25V
VCC5
D15
BAT54
R13
1K
C41
0.1 uF
U2
SEG60
64
S0
65
S1
66
S2
67
S3
68
S4
69
S5
70
K0
71
K1
72
K2
73
K3
74
K4
92
LED
78
OSC1
79
OSC2
84
SCL
85
DI
86
DO
83
CE
87
MODE
88
REQ1
89
REQ2
90
RESET
77
REMIN
82
INH
93
VLCD
94
BIAS
81
VDD
91
VSS
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
SEG1
SEG2
SEG3
SEG4
SEG5
SEG6
SEG7
SEG8
SEG9
COM1
COM2
COM3
COM4
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
100
99
98
97
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
COM1
COM2
COM3
COM4
SEG[1..60]
COM[1..4]
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
NJU6436
DS1
5
SEG1
6
SEG2
7
SEG3
8
SEG4
9
SEG5
10
SEG6
11
SEG7
12
SEG8
13
SEG9
14
SEG10
15
SEG11
16
SEG12
17
SEG13
18
SEG14
19
SEG15
20
SEG16
21
SEG17
22
SEG18
23
SEG19
24
SEG20
25
SEG21
26
SEG22
27
SEG23
28
SEG24
29
SEG25
30
SEG26
31
SEG27
32
SEG28
33
SEG29
34
SEG30
35
SEG31
36
SEG32
37
SEG33
38
SEG34
39
SEG35
40
SEG36
41
SEG37
42
SEG38
43
SEG39
44
SEG40
45
SEG41
46
SEG42
47
SEG43
48
SEG44
49
SEG45
50
SEG46
51
SEG47
52
SEG48
53
SEG49
54
SEG50
55
SEG51
56
SEG52
57
SEG53
58
SEG54
59
SEG55
60
SEG56
61
SEG57
62
SEG58
63
SEG59
64
SEG60
1
COM4
2
COM3
3
COM2
4
COM1
K3 Custom LCD
PCB Revision B
U2 K[0..4] to use separable vias to ground for debug/
development.
LCD pinout is Rev F.
R54 sets LCD driver current.
A A
NOTES:
Elecraft, Inc. Copyright (C) 2007.
L Johnson
Title
Size Document Number Rev
B
5
4
3
2
Date: Sheet
R57 sets LCD drive frequency.
Elecraft K3: Front Panel - LCD
2004070601 B.1
of
1
27 Tuesday, November 24, 2009
5
4
3
2
1
VCC5
D D
U14
MOSI
SCK
LOAD
VLEDBRT
MOSI
SCK
LOAD
VLEDBRT
C63
0.1 uF
2
SDI
15
SCK
7
SCLR
10
RCK
8
OE
1
VCC
16
GND
Q0
Q1
Q2
Q3
Q4
Q5
Q6
Q7
SDO
3
4
5
6
11
12
13
14
9
TPIC6C595D
C C
R37 120R
R36 120R
R34 120R
VCC8
R35 120R
D1
TX (RED)
D2
D-F (YEL)
D3
SHIFT (GRN)
D4
2 1
2 1
VCC5 VCC5
C62
0.1 uF
2 1
2 1
2
15
7
10
8
1
16
U13
SDI
SCK
SCLR
RCK
OE
VCC
GND
Q0
Q1
Q2
Q3
Q4
Q5
Q6
Q7
SDO
TPIC6C595D
D10
3
4
5
6
11
12
13
14
MICBIAS
R62 120R
MICBIAS
COM OUT (GRN)
2 1
9
2 1
Z8
LCD BACKLIGHT
R33 120R
R3
12R
3
B B
VLCDBKLT
VLCDBKLT
R31 1K00
1
Q4
FMMT614TA
2
R32 120R
R63 120R
R64 120R
LO (GRN)
D5
2 1
HI (GRN)
D6
2 1
WIDTH (GRN)
D8
2 1
SPEED (GRN)
D9
2 1
R67 120R
R54 120R
R53 120R
R61 120R
D12
2 1
OFS - (YEL)
D7
2 1
OFS CLR (GRN)
D13
2 1
OFS + (YEL)
D11
2 1
COM IN (GRN)
A A
NOTES:
Elecraft, Inc. Copyright (C) 2007.
L Johnson
Title
Size Document Number Rev
B
5
4
3
2
Date: Sheet
PCB Revision B
Elecraft K3: Front Panel - LEDs
2004070601 B.1
PWR (GRN)
of
1
37 Tuesday, November 24, 2009
5
4
3
2
1
U1
LCDSCL
LCDCE
MUTE
/DSP1BUSY
/DSP2BUSY
DSP1DATA
DSP2DATA
VCONTRAST
D D
VLCDBKLT
VCC5
LOAD
VMICBTN
VR1REAR
VR1FRONT
VPWR_SW
VR2FRONT
VR2REAR
VFPADCMUX
VSMTR
VCC5A
V12MON
VFADCTAP
VCC5
C C
SCL
SDA
LCDCE
MUTE
/DSP1BUSY
/DSP2BUSY
DSP1DATA
DSP2DATA
VCONTRAST
MCLR
VLCDBKLT
LOAD
VMICBTN ADR3
VR1REAR
VR1FRONT
VPWR_SW
/CSEEP
R5
T5
VR2FRONT
VR2REAR
VFPADCMUX
VSMTR
V12MON
VFADCTAP
EXP_FP1
FPTMP
VRFADCMUX
FCOUNT
SCL
SDA
TXD
RXD
SUBENCB
SUBENCA
1
RH2/A18
2
RH3/A19
3
RE1/WR/AD9
4
RE0/RD/AD8
5
RG0/CCP3
6
RG1/TX2/CK2
7
RG2/RX2/DT2
8
RG3/CCP4
9
MCLR
10
RG4/CCP5
11
VSS
12
VDD
13
RF7/SS
14
RF6/AN11
15
RF5/AN10/CVref
16
RF4/AN9
17
RF3/AN8
18
RF2/AN7/C!OUT
19
RH7/AN15
20
RH6/AN14
21
RH5/AN13
22
RH4/AN12
23
RF1/AN6/C2OUT
24
RF0/AN5
25
AVDD
26
AVSS
27
RA3/AN3/VREF+
28
RA2/AN2/VREF-
29
RA1/AN1
30
RA0/AN0
31
VSS
32
VDD
33
RA5/AN4/LVDIN
34
RA4/TOCKI
35
RC1/T1OSI/CCP2
36
RC0/T1OSO/T13CKI
37
RC6/TX1/CK1
38
RC7/RX1/DT1
39
RJ4/BA0
40 41
RJ5/CE
RH1/A17
RH0/A16
RE2/CS/AD10
RE3/AD11
RE4/AD12
RE5/AD13
RE6/AD14
RE7/CCP2/AD15
RD0/PSP0/AD0
RD1/PSP1/AD1
RD2/PSP2/AD2
RD3/PSP3/AD3
RD4/PSP4/AD4
RD5/PSP5/AD5
RD6/PSP6/AD6
RD7/PSP7/AD7
RJ0/ALE
RJ1/OE
RJ2/WRL
RJ3/WRH
RB0/INT0
RB1/INT1
RB2/INT2
RB3/INT3/CCP2
RB4/KBI0
RB5/KBI1/PGM
RB6/KBI2/PGC
OSC2/CLK0/RA6
OSC1/CLKI
RB7/KBI3/PGD
RC5/SDO
RC4/SDI/SDA
RC3/SCK/SCL
RC2/CCP1
RJ7/UB
RJ6/LB
VDD
VSS
VSS
VDD
80
79
78
77
76
75
74
73
72
71
70
69
68
67
66
65
64
63
62
61
60
59
58
57
56
55
54
53
52
51
50
49
48
47
46
45
44
43
42
PIC18LF8722
C4
0.1 uF
VCC3
VCC5
R4 100R
C2
0.1 uF
R19
4K70
MOSI
MISO
SCK
/CSEEP
SUBENCB
SUBENCA
1OE
2OE
3OE
4OE
GND
C9
0.1 uF
1A
2A
3A
4A
2
1
5
4
9
10
12
13
7
C6
0.1 uF
B B
MISO
VCC5
U6
3
1Y
6
2Y
8
3Y
11
4Y
14
VCC
SN74HCT125A
U7
MOSI
SCK
A A
/CSFLASH
2
1
5
4
9
10
12
13
7
1A
1OE
2A
2OE
3A
3OE
4A
4OE
2Y
3Y
4Y
GND1YVCC
3
6
8
11
14
VCC3
SN74LVC125A
5
4
LCDDI LCDSCL
LCDMODE
NB1AGC
DIG0
DIG1
/CSFLASH
PWRHOLDON
MISCENCMUX
ADR0
ADR1
ADR2
/CSRFMUX
/CSDSP1
/CSDSP2
/CSDSPLOAD
MAINENCA
MAINENCB
AUXBUS_RAW
/SR_EN
ENC_EN
/SPI23_EN
PGC
PGD
MOSI
MISO
SCK
VLEDBRT
RITENCA
RITENCB
VCC5A
C3
0.1 uF
VCC5
R44
VCC3
+
C5
10 uF/25V
10K0
5
2
6
1
7
3 4
5
2
6
1
7
3 4
VCC5
VCC5
U8
SI
VCC
SO
SCK
CS
HOLD
WP VSS
AT25256A
U5
SI
VCC
SO
SCK
CS
HOLD
WP VSS
M25P20
LCDDI
LCDMODE
PWRHOLDON
MISCENCMUX
ADR[2:0]
/CSDSP1
/CSDSP2
/CSDSPLOAD
MAINENCA
MAINENCB
VCC5
VCC5 VCC5
8
VCC3
8
ADR[2:0]
R72 2K20
R71 2K20
R70 2K20
R69 2K20
R5 330R
MOSI
MISO
SCK
VLEDBRT
RITENCA
RITENCB
R73 120R
/SR_EN
AUXBUS
D16
1 3
BAT54
VCC5
C1
0.1 uF
C35
0.1 uF
3
/PTT
/DOT
/DASH
/KEY /KEYB
Y2
16 MHz
C7
15 pF
C10
470 pF
C91
470 pF
MCLR
PGD
PGC
VCC5
1
C8
15 pF
R56 120R
R55 120R
R81 120R
R80 120R
R82 10K0
C81
1000 pF
/DSP2BUSY
DSP2DATA
U15
2
GND
5
GND
LM20CIM7
TXD
/ENC_EN
3 2
Q5
2N7002K
C89
1000 pF
3 4
VO V+
1
NC
/PTT
/ENC_EN
VCC5
R83
47K0
1
2
3
4
5
6
C12
1000 pF
R29 100K
R28 100K
J3
ICD-2
FPTMP
C11
1000 pF
EXP_FP1
L7 100 uH
12V_UNSW
/PWRON
3VBATT
12V_SW
/CSRFMUX
ADR0
ADR1
ADR2
ADR3
MOSI
MISO
SCK
FCOUNT
/KEY
/DASH
/DOT
/PTT
C90
1000 pF
R6 47K0
R74 47K0
R75 47K0
R76 47K0
R77 47K0
VCC5
2
J35
1
2
3
4
5
FP EXPAND
C96
1000 pF
NB1AGC
DIG0
DIG1
J30
AUXBUS
/SR_EN
/PTT
/DOT
/DASH
/KEY
RXD
TXDQ
/CSRFMUX
ADR0
ADR1
ADR2
ADR3
MOSI
SCK
MISO
/SPI23_EN
R5
T5
VRFADCMUX
FCOUNT
12V_UNSW
/PWRON
3VBATT
12V_SW
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
MOSI
MISO
SCK
MO
MI
SC
RF BOARD
C87 1000 pF
C14 1000 pF
C15 1000 pF
C86 1000 pF
C16 1000 pF C80 0.01 uF
C85 1000 pF
C17 1000 pF
C84 1000 pF
R5
T5
/SPI23_EN
VRFADCMUX
12V_UNSW
/PWRON
3VBATT
12V_SW
NB1AGC
DIG0
VCC5
DIG1
RXD
TXDQ
TXD
NOTES:
Elecraft, Inc. Copyright (C) 2007.
L Johnson
Title
Size Document Number Rev
B
PCB Revision B
Elecraft K3: Front Panel - MCU
2004070601 B.1
Date: Sheet
C83 0.01 uF
C19 0.01 uF
C18 0.01 uF
C82 0.01 uF
C20 0.01 uF
C79 0.01 uF
C21 0.01 uF
C94 0.01 uF
C93 1000 pF
C92 1000 pF
C13 1000 pF
C88 1000 pF
C70 1000 pF
1
47 Tuesday, November 24, 2009
of
5
4
3
2
1
VCC5B
R87 10K0
VCC5B
MICBIAS
D D
J32
R88 10K0
C98
1 uF
1
C97
1 uF
1
2
/PTT
3
4
5
DSP MIC AUDIO
2 3
Q8
MMBT3906
R89
5K60
AF
/PTT
DN
UP
FUNC
BIAS
L2 100 uH
L9 100 uH
L8 100 uH
L6 100 uH
L5 100 uH
L3 100 uH
J2
1
2
3
4
5
6
7
8
MIC
R48
R51
VCC5B
C C
1K00
1K00
VMICBTN
R52
1K00
R49
1K00
VMICBTN
R50
1K00
C66 0.01 uF
C65 0.01 uF
C64 0.01 uF
C58 0.01 uF
C71 0.01 uF
C75 0.01 uF
C78 0.01 uF
C76 0.01 uF
VCC5B
R1 10K
1
3
2
4
REAR (INNER) UPPER POT
6
5
B B
7
8
9
FRONT (OUTER) UPPER POT
C47
0.01 uF
VR1REAR
VR1FRONT
C45
0.01 uF
VR1REAR
VR1FRONT
C95 0.01 uF
C67 0.01 uF
TAIL5
TAIL1
TAIL2
TAIL3
TAIL4
TAIL6
TAIL7
TAIL8
STNDO2
STNDO3
STNDO5
STNDO6
STNDO8
STNDO4
STNDO1
STNDO7
C74 0.01 uF
C72 0.01 uF
CNR1
CNR3
CNR4
CNR2
HOLE1
HOLE2
TAIL9
FIDCL2
FIDCL1
PHONES
R2 10K
1
4
VCC5B
3
2
REAR (INNER) LOWER POT
6
VR2REAR
5
C44
0.01 uF
C43
VR2REAR
TAIL10
TAIL11
TAIL12
TAIL13
TAIL14
NOTES:
MICGND
PCB Revision B
Controls are dual pots.
0.01 uF
7
8
9
A A
FRONT (OUTER) LOWER POT
VR2FRONT
VR2FRONT
Elecraft, Inc. Copyright (C) 2007.
L Johnson
Title
C46
Elecraft K3: Front Panel - Miscellaneous
0.01 uF
5
4
3
Size Document Number Rev
A
Date: Sheet
2004070601 B.1
57 Tuesday, November 24, 2009
2
of
1
5
4
3
2
1
R43 30K0
D D
U9
1
+VIN
OUT
3
12V_SW
L1 (R68)
12V_SW
2.2 mH
2 4
L1 occupies site
labeled R68.
GND TAB
LM2937IMP-8.0
U10
C73
470 uF/25V
+
C59
470 uF/25V
1
+VIN
C53
+
0.1 uF
2 4
GND TAB
OUT
3
UA78M05
3VBATT
C C
C51
0.1 uF
C55
0.1 uF
VCC8
VCC5
C52
+
1000 uF/10V
+
C57
10 uF/25V
D17
1 3
2
BAT54C
R38
10K0
VCC5CLK
VCC5B
/PWRON
12V_UNSW
S18
POWER
1
C40
0.1 uF
3 2
Q3
2N7002K
R84 100R
C77
0.1 uF
+
C48
10 uF/25V
V12MON
C50
0.1 uF
SCL
SDA
R45
100K
V12MON
SCL
SDA
VCC5
R85
10K0
C61
0.1 uF
R86
10K0
6
5
3
8
4
U16
SCL
SDA
INT
VDD
VSS
CLKOUT
PCF8563T
OSCI
OSCO
1
Y1
32 kHz
C60
33 pF
2
7
Q6
3 2
Q2
POWERHOLDON
C42
0.1 uF
R24
10K0
R26
B B
VPWR_SW
VPWR_SW
30K0
R25
10K0
1
2N7002K
1
2
1
2
TP2
GND
TP1
GND
3 2
2N7002K
1
VCC3 VCC5
5
C37
4
10 uF 10v ECJ
1
3
2
U4
VIN
Enable
GND
OUT
Bypass
LP2985-3.3
5 3
U11
74AHC1GU04
2 4
PCB Revision B
A A
NOTES:
Elecraft, Inc. Copyright (C) 2007.
L Johnson
Title
Size Document Number Rev
B
5
4
3
2
Date: Sheet
Regulators U3 and U5 SOT-223.
Elecraft K3: Front Panel - Power and RTC
2004070601 B.1
of
1
67 Tuesday, November 24, 2009
5
4
3
2
1
VCC5
R9
R12
R15
R17
R18
VCC5
1K00
D D
C C
B B
A A
5
1K00
S2A
MODE-
S2B
MODE+
S10
XMIT
S11
ATUTUNE
S15
M1
S9
M>V
S1A
BAND-
S1B
BAND+
S4
DISP
S5
A/B
S7
A>B
S8
V>M
S3
MENU
1K00
SCANADC0
SCANADC1
SCANADC2
SCANADC3
SCANADC4
SCANADC5
SCANADC0
SCANADC1
SCANADC2
SCANADC3
SCANADC4
SCANADC5
SCANADC6
1K00
S21
NB
S22
NR
S23
NOTCH
S24
M3
S17
REC
S25
M4
S19
RX ANT
S20
ANT
S12
PRE
S13
AGC
S14
XFIL
S16
M2
S6
REV
1K00
SCANADC0
SCANADC1
SCANADC2
SCANADC3
SCANADC4
SCANADC5
SCANADC0
SCANADC1
SCANADC2
SCANADC3
SCANADC4
SCANADC5
SCANADC7
4
R39
1K00
S32
FINE
S34
RATE
S35
SUB
S33
CLR
S26
FREQ ENT
S27
SPOT
S28
CWT
S29
AFX
S30
RIT
S31
XIT
R42
1K00
SCANADC0
SCANADC1
SCANADC2
SCANADC4
SCANADC0
SCANADC1
SCANADC2
SCANADC3
SCANADC4
SCANADC5
3
TAP7 TAP5 TAP3 TAP2 TAP4 TAP6 TAP1
VCC5
MAIN ENC Z5
SUB ENC Z6
R58
3K00
Z1
6 7
MTG1 MTG2
Z2
6 7
MTG1 MTG2
Z3
6 7
MTG1 MTG2
Z4
6 7
MTG1 MTG2
R79 10K0
R78 10K0
J33
J34
5
4
3
2
1
5
4
3
2
1
Z7
OFFSET
SHIFT
A COM
B
SW SWCOM
WIDTH
A COM
B
SW SWCOM
SPEED
A COM
B
SW SWCOM
PWR
A COM
B
SW SWCOM
1 3
A COM
2
B
1 2
3
4 5
1 2
3
4 5
1 2
3
4 5
1 2
3
4 5
VCC5
VCC5
SCANADC2
SCANADC0
SCANADC1
SCANADC3
SCANADC7
SCANADC4
SCANADC6
SCANADC5
ADR0
ADR1
ADR2
SCANADC1
SCANADC3
SCANADC0
SCANADC2
MAINENCB
MAINENCA
/ENC_EN
SUBENCB
SUBENCA
RITENCA
RITENCB
13
14
15
12
1
5
2
4
6
11
10
9
2
U3
X0
X1
X2
X3
X4
X5
X6
X7
INH
A
VDD
B
VSS
C
VEE
CD74HC4051M
ADR0
ADR1
ADR2
TAP7
MAINENCB
MAINENCA
/ENC_EN
SUBENCB
SUBENCA
RITENCA
RITENCB
3
X
16
8
7
R47 10K0
R41 10K0
R46 10K0
R40 10K0
R60 10K0
R59 10K0
R65 10K0
R66 10K0
U12
13
X0
14
X1
15
X2
12
X3
1
X4
5
X5
2
X6
4
X7
6
INH
11
A
10
9
VDD
B
VSS
C
VEE
CD74HC4051M
VCC5
3
1
2
NOTES:
Elecraft, Inc. Copyright (C) 2007.
L Johnson
Title
Size Document Number Rev
Date: Sheet
Elecraft K3: Front Panel - Switches
2004070601 B.1
B
3
1
2
VCC5
3
X
16
8
7
Q7
MMBT3904
VFADCTAP
R57
1K00
PCB Revision B
Q1
MMBT3904
R21
1K00
VCC5
C33
0.1 uF
VFPADCMUX
C39
1000 pF
R27 100K
R22 100K
R30 100K
R14 100K
R8 100K
R11 100K
R10 100K
R7 100K
C30 1000 pF
C31 1000 pF
C29 1000 pF
C28 1000 pF
C27 1000 pF
C22 1000 pF
C24 1000 pF
C23 1000 pF
MISCENCMUX
ADR[2:0]
VCC5
C56
0.1 uF
V
VFADCTAP
C68
0.01 uF
1
S
VFPADCMUX
MISCENCMUX
ADR[2:0]
C25
0.01 uF
C26
0.01 uF
C34
0.01 uF
C36
0.01 uF
C49
0.01 uF
C54
0.01 uF
C69
0.01 uF
of
77 Tuesday, November 24, 2009
SCANADC0
SCANADC1
SCANADC2
SCANADC3
SCANADC4
SCANADC5
SCANADC6
SCANADC7
SCANADC0
SCANADC1
SCANADC2
SCANADC3
SCANADC4
SCANADC5
SCANADC6
SCANADC7
TAP1
TAP2
TAP3
TAP4
TAP5
TAP6
TAP7
5
RX1_IF+
RX1_IF-
D D
RX IF BUFFER
RX1_IF+
RX1_IF-
RX IF BUFFER
RX1_BIF+
RX1_BIF-
RX1_BIF+
RX1_BIF-
RX2_BIF+
RX2_BIF-
MICIN
LOUT
ROUT MSCK
LHPOUT
RHPOUT
LINE_IN+
LINE_INBK_MICAF+
BK_MICAF-
BK_MICAFBK_MICAF+
LINE_INLINE_IN+
CODECS
CODECS
MISC
MICIN
C C
B B
A A
RX2_BIFRX2_BIF+
RX1_IFRX1_IF+
LRCLKPCM1804
CLK3MHZ CTDOB
AICBCLK
MMISO
MMOSI
MSCK
MISC
5
4
RX1_BIF+
RX1_BIF-
RX2_BIF+
RX2_BIF-
MICIN
LOUT
ROUT
LHPOUT
RHPOUT
LINE_IN+
LINE_INBK_MICAF+
BK_MICAF-
BK_MICAFBK_MICAF+
LINE_INLINE_IN+
LRCLKPCM1804
MICIN
RX2_BIFRX2_BIF+
RX1_IFRX1_IF+
LRCLKPCM1804
CLK3MHZ
AICBCLK
MMISO
MMOSI
MSCK
4
TCLK0
AICBCLK
LRCLKAIC23
DSPDX0
AICADC
LRCLKLIN
CLK3MHZ
PCMADC
MSCK
MMOSI
/AICCS
/LINCS
/RST
MICS[2..0]
SMOSI
SSCK
/CSDSP1A
DIG0A
MUTEA
100HZA
/CSDSP2A
SMISO
MOSI
/CSDSPLOAD
/AUXDETECT
SCK
CMD
/DVRCS
CTDOB
/ENC1
AUXD0
AUXD1
/DSP1BUSYA
/RST
DSP1DATAA
/MISOEN
DSP2DATA
/RST5
/RST2
/SPIBOOT2
FX2
DX2
PRGEXP
/ENC2
PCMDSP2
/ENDVR
TXIFQ
TXIFI
MICBIAS
LINEOUT_R
LINEOUT_L
PHONES_R
PHONES_L
SPKR_R
SPKR_L
PH_SW
BK_PH_SW
ALC
VREF
VFWD
HAGC1
VSMETER2
VSMETER
VIFGAIN1
TCLK0
AICBCLK
LRCLKAIC23
DSPDX0
AICADC
LRCLKLIN
CLK3MHZ
LRCLKPCM1804
PCMADC
MMOSI
/AICCS
/LINCS
/RST
MICS[2..0]
SMOSI
SSCK
/CSDSP1A
DIG0A
MUTEA
100HZA
/CSDSP2A
SMISO
MOSI
SCK
/CSDSPLOAD
CMD
/DVRCS
/ENC1
AUXD0
AUXD1
/DSP1BUSYA
/RST
DSP1DATAA
/MISOEN
DSP2DATA
/RST5
/RST2
/SPIBOOT2
FSX2
DX2
PRGEXP
/ENC2
PCMDSP2
/ENDVR
TXIFQ
TXIFI
MICBIAS
LINEOUT_R
LINEOUT_L
PHONES_R
PHONES_L
SPKR_R
SPKR_L
PH_SW
BK_PH_SW
/AUXDETECT
ALC
VREF
VFWD
HAGC1
VSMETER2
VSMTR
VIFGAIN1
DSP
TCLK0
AICBCLK
LRCLKAIC23
DSPDX0
AICADC
LRCLKLIN
CLK3MHZ
LRCLKPCM1804
PCMADC
/AICCS
/LINCS
/RST
MICS[2..0]
SMOSI
SSCK
/CSDSP1
DIG0A
MUTE
100HZ
/CSDSP2
SMISO
MOSI
SCK
/CSDSPLOAD
CMD
/DVRCS
CTDOB
/ENC1
AUXD0
AUXD1
/DSP1BUSYA
DSP1DATAA
/MISOEN
DSP2DATA
/RST5
/DSPRST2
/SPIBOOT2
AUXDSPFSX
AUXDSPDX
PRGEXP
/ENC2
PCMDSP2
/ENDVR
DSP
3
2
1
ANALOG INTERFACE
MMISO
MMOSI
MSCK
/ADCCS
/DACCS
MMISO
MMOSI
MSCK
/ADCCS
/DACCS
MMISO
MMOSI
MSCK
nADCS
nDACS
VIFGAIN1
VSMETER
VSMETER2
HAGC1
VFWD
VREF
ALC
/AUXDSPDET
BK_PH_SW
PH_SW
SPKR_R
VIFGAIN1
VSMTR
VSMETER2
HAGC1
VFWD
VREF
ALC
/AUXDETECT
BK_PH_SW
PH_SW
SPKR_R
ANALOG INTERFACE
DAC AUDIO
LHPOUT
RHPOUT
MUTE1
LOUT
ROUT
HPCLK
UP
SPKR_L
SPKR_R
PHONES_L
PHONES_R
LINEOUT_L
LINEOUT_R
SPKR_L
SPKR_R
PHONES_L
PHONES_R
LINEOUT_L
LINEOUT_R
MUTE1
HPCLK
UP
MUTE1
HPCLK
UP
LHPOUT
RHPOUT
LOUT
ROUT
AUDIO
+12V
Linear Power
+12V MICBIAS
MICBIAS
Linear Power
TXDAC
TCLK0
AICBCLK
LRCLKDAC
DSPDX0
MSCK
MMOSI
/TXDACCS
TXIFI
TXIFQ
TXIFI
TXIFQ
LRCLKDAC
/TXDACCS
TCLK0
AICBCLK
LRCLKDAC
DSPDX0
MSCK
MMOSI
/TXDACCS
TXDAC
Elecraft, Inc. Copyright (C) 2007 - 2010.
L Johnson
Title
K3 DSP: Top Level
Size Document Number Rev
NOTES:
3
PCB Revision C
2
Date: Sheet
2004051101 C
B
1
19 Wednesday, June 16, 2010
of
5
4
3
2
1
U18
D D
nDACS
MMOSI
MSCK
nDACS
VCC3
10
9
8
1
2
DIN
SCLK
LDAC
VDD
GND
VOUTA
VOUTB SYNC
VREFA
VREFB
5
6 7
4
3
VIFGAIN1
VCC3
VIFGAIN1
D2
1 3
2
BAT54C
R50
10K
VSMETER
C106
0.01 uF
VSMETER
AD5302A
VSMETER2
VCC2
C C
SPKR_R
SPKR_R
R71 100R R10 100K
C14
C17
0.1 uF
R11
100K
D1
BAT54C
R28 10K
R30 10K
R29 10K
/AUXDSPDET
PH_SW
BK_PH_SW
0.1 uF
1 3
2
U8
ALC
VFWD
VREF
HAGC1
B B
PH_SW
BK_PH_SW
/AUXDSPDET
ALC
VFWD
VREF
HAGC1
PH_SW
BK_PH_SW
/AUXDSPDET
VCC3A
10
11
4
5
6
7
8
9
2
3
AIN1
AIN2
AIN3
AIN4
AIN5
AIN6
AIN7
AIN8
AVDD
AGND
DIN
SCLK
DOUT
CS
DVDD
DGND
14
16
15
1
13
12
MMOSI
MSCK
MMISO
nADCS
VCC3
MMOSI
MSCK
MMISO
nADCS
ADC78H90CIMT
NOTES:
PCB Revision C
Elecraft, Inc. Copyright (C) 2007 - 2010.
A A
L Johnson
Title
K3 DSP: Analog Interface
Size Document Number Rev
A
Date: Sheet
5
4
3
2004051101 C
29 Wednesday, June 16, 2010
2
of
1
5
4
3
2
1
D D
R63
LHPOUT
60.4K 1%
C116
1500 pF 5% C0G
R64
34.0K 1%
C110
C109
0.015 uF 5% X7R
4 11
10
9
U30C
+
8
-
R65
10.5K 1%
TLC2274
R66
10.5K 1%
C111
VCC8A VCC8A
4 11
5
6
U30B
+
7
-
TLC2274
C2 0.47 uF
C10 0.47 uF
R2 20K
R9 20K
MUTE1
1000 pF 5% C0G
1000 pF 5% C0G
C1 470 pF
R1 100K
R8 100K
C11 470 pF
U1
1
INA
OUTA
9
2
4
5 6
10
OUTB
INB
SHUTDOWN
GND
GND VDD
BYPASS
TAB
3
7
8
R3 2.7R
R6 2.7R
LM4950TS
C8
3.3 uF
C C
LOUT LINEOUT_L
ROUT
C18 10 uF/25V
C15 10 uF/25V
+
+
C3 0.1 uF
C6 0.1 uF
C4
+
1 uF/25V
SPKR_L
SPKR_R
+12V
LINEOUT_R
C7
0.1 uF
C112
1500 pF 5% C0G
R67
R68
RHPOUT
60.4K 1%
34.0K 1%
C114
B B
4 11
12
13
U30D
+
14
-
R69
10.5K 1%
TLC2274
1000 pF 5% C0G
C113
0.015 uF 5% X7R
R70
10.5K 1%
C115
1000 pF 5% C0G
4 11
3
+
2
-
1
TLC2274
U30A
C19 0.47 uF
C16 0.47 uF
HPCLK
UP
C22
+
U2
2
INA
8
INB
4
CLK
6
UP/DN
7
SHUTDOWN
3
BYPASS
LM4811MM
OUTA
OUTB
VDD
GND
VCC5A
+
+
PHONES_L
PHONES_R
1
9
C13 100 uF/6.3V
C9 100 uF/6.3V
10
5
10 uF/25V
VCC8A VCC8A
NOTES:
A A
Elecraft, Inc. Copyright (C) 2007 - 2010.
L Johnson
Title
Size Document Number Rev
B
5
4
3
2
Date: Sheet
PCB Revision C
K3 DSP: DAC Audio
2004051101 C
of
1
39 Wednesday, June 16, 2010
5
4
3
2
1
C32 100 pF
C33
LINE_IN+
D D
LINE_IN-
LINE_IN+
LINE_IN-
1 uF
C34
1 uF
R20 10K
R18 10K
R17 10K
R19
10K
C36
BK_MICAF+
C C
BK_MICAF-
BK_MICAF+
BK_MICAF-
1 uF
C37
1 uF
R26 10K
R24 10K
R23 10K
R25
10K
VCC8A
U6A
LM833D
8 4
3
+
2
-
1
VCC8A
U6B
LM833D
8 4
5
+
6
-
7
C43 100 pF
ROUT
LOUT
VMIDL
C107
10 uF 10v ECJ
C45 1 uF
C44 1 uF
ROUT
LOUT
C108
0.1 uF
U29
23
SDIN
24
SCLK
21
13
ROUT
12
LOUT
10
RHPOUT
9
LHPOUT
16 26
VMID XTO
CS
MODE
DIN
BCLK
LRCIN
XTI/MCLK
CLKOUT
AVDD
BVDD
DVDD
HPVDD
22
4
3
5
25
2
14
1
27
8
MMOSI
MSCK
/LINCS
VCC3
DSPDX0
AICBCLK
LRCLKLIN
TCLK0
VCC3A
VCC3
RHPOUT
LHPOUT
/LINCS
C47
+
10 uF/25V
LRCLKLIN
RLINEIN
LLINEIN
RHPOUT
LHPOUT
VMID
C48
0.1 uF
U7
19
RLINEIN
20
LLINEIN
13
ROUT
12
LOUT
10
RHPOUT
9
LHPOUT
18
MCIN
17
MCBIAS
16 26
VMID XTO
SDIN
SCLK
CS
MODE
DIN
DOUT
BCLK
LRCIN
LRCOUT
XTI/MCLK
CLKOUT
AVDD
BVDD
DVDD
HPVDD
AVSS
DVSS
HPGND
TLV320AIC23B
23
24
21
22
4
6
3
5
7
25
MMOSI
MSCK
/AICCS
VCC3
DSPDX0
AICADC
AICBCLK
LRCLKAIC23
TCLK0
MMOSI
MSCK
/AICCS
DSPDX0
AICADC
AICBCLK
LRCLKAIC23
TCLK0
2
14
1
27
8
15
28
11
VCC3A
VCC3
VCC8A
15
AVSS
28
DVSS
U5A
LM833D
R16 10K
C31
B B
C28
MICIN
MICIN
0.1 uF
R13 10K
1 uF
MICS[2..0]
MICS[2..0]
VCC3A
8 4
3
+
2
-
1
R15 100K
C30 100 pF
VCC8A
U5B
LM833D
8 4
5
7
A A
+
6
-
5
R22
2.2K
C42
0.1 uF
R27
2.2K
+
C41
0.1 uF
MICS0
MICS1
MICS2
C40
10 uF/25V
U4
12
X0
13
X1
2
Y0
1
Y1
3
Z1
11
10
9
6 7
VCC
XC
GND
YC
ZC
INH VEE
74HCT4053M
LRCLKAIC
AICADC
RHPOUT
LHPOUT
4
TLV320DAC23
14
X
R21 49.9K
15
Y
R14 10K
4 5
Z Z0
16
VCC5A
8
LRCLKAIC23
AICADC
RHPOUT
LHPOUT
3
HPGND
11
RX1_BIF+
RX1_BIF-
RX2_BIF+
RX2_BIF-
RX1_BIF+
RX1_BIF-
RX2_BIF+
RX2_BIF_
NOTES:
C89
0.1 uF
PCB Revision C
C80
0.1 uF
2
U23
4
VinL
5
VinL
1
VrefL
3
VcomL
2
AgndL
25
VinR
24
VinR
28
VrefR
26
VcomR
27
AgndR
22
VCC
23
AGND
DATA/DSDL
LRCK/DSDBCK
BCK/DSDL
BYPAS
DGND
SCKI
FMT0
FMT1
S/M
OSR0
OSR1
OSR2
OVFR
OVFL
RST
VDD
18
15
17
16
6
7
8
9
10
11
12
20
21
19
14
13
TCLK0
PCMADC
LRCLKPCM1804
CLK3MHZ
VCC3
/RST
VCC3 VCC5A
PCM1804DB
Elecraft, Inc. Copyright (C) 2007 - 2010.
L Johnson
Title
K3 DSP: CODECS
Size Document Number Rev
Date: Sheet
2004051101 C
B
1
49 Wednesday, June 16, 2010
PCMADC
LRCLKPCM1804
CLK3MHZ
/RST
of
5
4
3
2
1
U22
2
SDI
15
SCK
7
SCLR
10
RCK
8
OE
1
VCC
16
GND
Q0
Q1
Q2
Q3
Q4
Q5
Q6
Q7
SDO
3
4
5
6
11
12
13
14
9
TPIC6C595D
U11
1
A
2
B
3
C
6
G1
4
G2A
5
G2B
16
VCC
8
GND
Y0
Y1
Y2
Y3
Y4
Y5
Y6
Y7
15
14
13
12
11
10
9
7
74HC138M
/INT0
/INT1
/INT2
/INT3
/SHZ
/HOLD
/RST
/DSPRST
/SPIBOOT
MICS0
MICS1
MICS2
D4 STATUS1
D3 STATUS2
MOSI
/ENC1
SCK
DSP2DATA
CTDO CTDOB
R40 10K
R39 10K
R41 10K
R42 10K
R36 10K
R38 10K
R58 10K
R51 10K
R52 10K
R31 10K
R32 10K
R34 10K
R54 220R
2 1
R53 220R
2 1
2
1
5
4
9
10
12
13
7
CTCK
CTDO
VCC3
CTMS
CTDI
2004051101 C
Y1 14.7456 MHz
C62
10 pF
R37 100R
D D
C63
10 pF
VCC3
H1
R35 33R
TCLK0
DSPDX0
C C
VCC3
DSP1DATAA
/DSP1BUSYA
R48 10K
R45 10K
R44 10K
R43 10K
R47 10K
R46 10K
P59
TDI
VCC3
TDO
TCK
TCK
B B
1 2
3 4
5 6
7 8
9 10
11 12
13 14
TCLK0
TCLK1
DSPDR0
DSPCLKR0
DSPFSR0
DSPDX0
AICBCLK
DSPFSX0
DSP1DATAA
/DSP1BUSYA
VCC3
TRST TMS
EMU1 EMU0
TCK
TDI
TDO
TMS
TRST
EMU0
EMU1
JTAG-DSP
VCC2
VCC3
U21
/RST
1 2
RST VDD
3
VSS
/RST
MCP120D
A A
133
132
130
38
39
136
135
114
113
104
107
106
111
109
110
117
116
98
100
99
102
103
96
95
15
23
31
37
43
53
60
69
77
86
94
108
115
129
143
138
139
12
28
46
66
83
101
123
137
131
134
18
25
34
40
49
56
63
72
80
89
6
2
9
U16
XIN
XOUT
EXTCLK
H1
H3
CLKMD0
CLKMD1
TCLK0
TCLK1
DR0
CLKR0
FSR0
DX0
CLKX0
FSX0
XF0
XF1
TCK
TDI
TDO
TMS
TRST
EMU0
EMU1
DVDD
DVDD
DVDD
DVDD
DVDD
DVDD
DVDD
DVDD
DVDD
DVDD
DVDD
DVDD
DVDD
DVDD
DVDD
DVDD
RSV0
RSV1
CVDD
CVDD
CVDD
CVDD
CVDD
CVDD
CVDD
CVDD
PLLVdd
PLLVss
VSS
VSS
VSS
VSS
VSS
VSS
VSS
VSS
VSS
VSS
VSS
VSS
A0
A1
A2
A3
A4
A5
A6
A7
A8
A9
A10
A11
A12
A13
A14
A15
A16
A17
A18
A19
A20
A21
A22
A23
D0
D1
D2
D3
D4
D5
D6
D7
D8
D9
D10
D11
D12
D13
D14
D15
D16
D17
D18
D19
D20
D21
D22
D23
D24
D25
D26
D27
D28
D29
D30
D31
STRB
R/W
PAGE0
PAGE1
PAGE2
PAGE3
RDY
HOLD
HOLDA
INT0
INT1
INT2
INT3
IACK
EDGEMODE
MCBL/MP
SHZ
RESET
VSS
VSS
VSS
VSS
VSS
VSS
30
29
27
26
24
22
21
20
19
17
16
14
13
11
10
8
7
5
4
3
1
144
142
141
93
92
91
90
88
87
85
84
82
81
79
78
76
75
74
73
71
70
68
67
65
64
62
61
59
58
57
55
54
52
51
50
41
42
36
35
33
32
45
47
48
122
121
120
119
44
124
125
128
127
97
105
112
118
126
140
A0
A1
A2
A3
A4
A5
A6
A7
A8
A9
A10
A11
A12
A13
A14
A15
A16
A17
A18
D0
D1
D2
D3
D4
D5
D6
D7
D8
D9
D10
D11
D12
D13
D14
D15
/WR
/PAGE0
/PAGE1
/PAGE3
/RDY
/HOLD
/INT0
/INT1
/INT2
/INT3
/SHZ
/RSTDSP
VCC3
AUXDSPDX
MMOSI
MSCK
AUXD0
/RSTDSP
/DSPRST
AUXDSPDX
MMOSI
MSCK
D0
D1
D2
D3
D4
D5
D6
D7
D8
D9
D10
D11
D12
D13
D14
D15
/RDY
/WR
H1
/PAGE0
/PAGE1
/PAGE3
A0
A1
AUXD0
VCC3
A0
A1
A2
A3
A4
A5
A6
A7
A8
A9
A10
A11
A12
A13
A14
A15
A16
A17
A18
/PAGE1
/RD
/WR
TMS320VC33PGE
5
4
3
U10
25
A0
24
A1
23
A2
22
A3
21
A4
20
A5
19
A6
18
A7
8
A8
7
A9
6
A10
5
A11
4
A12
3
A13
2
A14
1
A15
48
A16
17
A17
16
A18
26
CE
11
WE
SST39VF800A
U17
12
IO/GCLK0
14
IO/GCLK1
62
IO/GCLK2
64
IO/GCLK3
43
IO/DEV_OE
44
IO/DEV_CLRn
1
IO
2
IO
3
IO
4
IO
5
IO
6
IO
7
IO
8
IO
15
IO
16
IO
17
IO
18
IO
19
IO
20
IO
21
IO
26
IO
27
IO
28
IO
29
IO
30
IO
33
IO
34
IO
35
IO
36
IO
37
IO
13
VCCINT
63
VCCINT
9
VCCIO1
31
VCCIO1
45
VCCIO1
59
VCCIO2
80
VCCIO2
94
VCCIO2
11
GNDINT
65
GNDINT
10
GNDIO
32
GNDIO
46
GNDIO
60
GNDIO
79
GNDIO
93
GNDIO
EPM240TQFP100
D0
D1
D2
D3
D4
D5
D6
D7
D8
D9
D10
D11
D12
D13
D14
D15
VDD
VSS OE
VSS
TDI
TMS
TCK
TDO
D0
29
D1
31
D2
33
D3
35
D4
38
D5
40
D6
42
D7
44
D8
30
D9
32
D10
34
D11
36
D12
39
D13
41
D14
43
D15
45
37
27 28
46
VCC3
MOSI
SCK
/RST5
/CSDSPLOAD
MOSI
SCK
/RST5
/CSDSPLOAD
+5V
MICS0
MICS1
MICS2
PRGEXP
VCC3
LEDST1
A2
38
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
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
23
22
24
25
AUXD1
A3
/RD
MMISO
/DVRCS
CMD
/ADCCS
/SPIBOOT
/DACCS
/CSDSP1
DIG0A
MUTE
100HZ
/CSDSP2
/MISOEN
/RST
LEDST2
AUXDSPSFX
LRCLKPCM1804
CLK3MHZ
PCMDSP2
PCMADC
SSCK
SMOSI
SMISO
AICADC
LRCLKAIC23
DSPDR0
/INT0
/INT1
/INT2
/INT3
LRCLKDAC
/TXDACCS
MUTE1
UP
LRCLKLIN
HPCLK
TCLK0
/AICCS
/LINCS
TCLK1
DSPFSX0
DSPCLKR0
DSPFSR0
CTDI
CTMS
CTCK
CTDO
VCC3
NOTES:
AUXD1
MMISO
/DVRCS
CMD
/ADCCS
/DACCS
/CSDSP1
DIG0A
MUTE
100HZ
/CSDSP2
/MISOEN
AUXDSPFSX
LRCLKPCM1804
CLK3MHZ
PCMDSP2
PCMADC
SSCK
SMOSI
SMISO
AICADC
LRCLKAIC23
LRCLKDAC
/TXDACCS
MUTE1
UP
LRCLKLIN
DSP2DATA
HPCLK
/AICCS
/LINCS
R62
AICBCLK
330R
PCB Revision C
2
AICBCLK
Elecraft, Inc. Copyright (C) 2007 - 2010.
L Johnson
Title
K3 DSP: DSP AND LOGIC
Size Document Number Rev
B
Date: Sheet
MICS[2..0]
/DSPRST
/SPIBOOT
/DSPRST2
/SPIBOOT2
MICS0
MICS1
MICS2
PRGEXP
R33 10K
/ENC1
/ENDVR
/ENC2
VCC3
U13
1A
1OE
2A
2OE
3A
3OE
4A
4OE
2Y
3Y
4Y
GND1YVCC
SN74LVC125A
P57
1
2
3
4
5
6
7
8
9
10
JTAG - CPLD
1
/PAGE0
/PAGE3
3
6
8
11
14
CTDI
CTCK
CTMS
59 Wednesday, June 16, 2010
MICS[2..0]
/DSPRST2
/SPIBOOT2
PRGEXP
VCC3
/ENC1
/ENDVR
/ENC2
VCC3
of
PG2
PG1
CTDOB
5
D D
4
3
2
1
VCC2
C65
0.1 uF
C64
0.1 uF
C69
0.1 uF
C58
0.1 uF
C60
0.1 uF
C66
0.1 uF
VCC3
C57
0.1 uF
C C
+5V
C85
+
100 uF/10V
VCC3 VCC2
U9
2 1
IN OUT
7
8
3 6
OUT
SHDN
FAULT
ADJ
GND CC
LP3982
4
5
C54
0.033 uF
C56
10 uF 10v ECJ
+12V
C102
0.1 uF
U27
1
+VIN
OUT
2 4
GND TAB
UA78M05CDC
U28
1
+VIN
OUT
VCC5A
U26
3
C103
+
10 uF/25V
3
C100
0.1 uF
VI
1
2
VO
4
VO
GND
FAN1086M33
C93
+
100 uF/10V
VCC8A
3
L1 100 uH
MICBIAS
VCC3
+5V
C70
0.1 uF
C77
0.1 uF
C59
0.1 uF
C72
0.1 uF
VCC3
C104
B B
C105
0.1 uF
2 4
GND TAB
UA78M08CDC
+
10 uF/25V
+
C27
10 uF/25V
C35
0.1 uF
C73
0.1 uF
L2 100 uH
C52
0.1 uF
TP2
1
A
2
B
GND
VCC5A
C61
0.1 uF
C86
0.1 uF
+
VCC8A
C51
10 uF/25V
C68
0.1 uF
C74
0.1 uF
C38
0.1 uF
C49
0.1 uF
C53
0.1 uF
C78
0.1 uF
C87
0.1 uF
C50
0.1 uF
C71
0.1 uF
C75
0.1 uF
VCC3A
C46
0.1 uF
C55
0.1 uF
TP1
1
A
2
B
GND
C23
0.1 uF
+
C29
10 uF/25V
C79
0.1 uF
C12
0.1 uF
C21
0.1 uF
C39
0.1 uF
TP3
1
A
2
B
GND
A A
NOTES:
Elecraft, Inc. Copyright (C) 2007 - 2010.
L Johnson
Title
Size Document Number Rev
B
5
4
3
2
Date: Sheet
PCB Revision C
K3 DSP: Power Supply
2004051101 C
of
1
69 Wednesday, June 16, 2010
5
4
3
2
1
P31
MOSI
1
SCK
2
MISO
3
MUTE
4
5
/DSP1BUSY
D D
6
7
8
9
10
11
12
13
14
15
16
/DSP2BUSY
VSMETER
/CSDSP1
/CSDSP2
/CSDSPLOAD
DSP1DATA
DSP2DATA
MOSI
SCK
VSMETER
/CSDSPLOAD
DSP2DATA
J1
PHONES
5
6
7
1
2
3
4
8
9
PH_SW
C26
0.1 uF
C5
0.1 uF
PH_SW
R12 8.2R
R4 8.2R
PHONES_L
PHONES_R
MOSI
SCK
/CSDSP1 /CSDSP1A
DIG0
100HZ
/CSDSP2
MISO
J51
FP-DSP
P32
1
2
3
4
5
C C
DSP MIC
MICIN
MICBIAS
MICIN TXIFI
MICBIAS
J52
SMISO
1
SMOSI
2
SSCK
3
/CSDSP2A
4
/RST2
5
DSP2DATAA
6
/SPIBOOT2
7
PCMDSP2
8
LRCLKPCM1804
9
CLK3MHZ
10
AICBCLK
11
FSX2
12
DX2
13
/DSP2BUSYA
14
/AUXDETECT
15
/ENC2
16
AUXD0
17
RX2_BIF-
18
VSMETER2
19
RX2_BIF+
20
DSP2DATA
21
B B
AUXD1
22
23
24
25
26
VCC8A
VCC3
/RST2
/SPIBOOT2
PCMDSP2
LRCLKPCM1804
CLK3MHZ
AICBCLK
FX2
DX2
/AUXDETECT
/ENC2
AUXD0
RX2_BIFVSMETER2
RX2_BIF+
AUXD1
DSP IF
J50
Aux DSP
J53
1
2
3
4
5
RX2_IF+
RX2_IFHAGC2
VIFGAIN2
DSP AF
Aux DSP
A A
RX1_IF+
1
2
100HZ /DSP2BUSYA
3
4
TXIFI
5
TXIFQ
6
RX2_IF+
7
RX2_IF-
8
VIFGAIN1
9
VIFGAIN2
10
VFWD
11
VREF
12
13
14
15
16
17
18
19
20
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
SPKR_L
SPKR_L
SPKR_R
SPKR_R
BK_PH_SW
ALC
BK_PH_L
BK_PH_R
LINEOUT_R
LINEOUT_L
BK_MICAFBK_MICAF+
LINE_INLINE_IN+
DIG0
HAGC1
HAGC2
+5V
+12V
RX1_IF+
RX1_IF-
TXIFQ
VIFGAIN1
VFWD
VREF
HAGC1
SPKR_L
SPKR_R
BK_PH_SW
ALC
LINEOUT_R
LINEOUT_L
BK_MICAFBK_MICAF+
LINE_INLINE_IN+
SPARE1
R49 10K
R5 8.2R
R7 8.2R
PRGEXP
PHONES_L
PHONES_R
+5V
PRGEXP
PHONES_L
PHONES_R
/ENDVR
VCC3
5 3
U12
2 4
NC7SZ14
J54
1
2
3
4
5
6
7
8
9
10
DVR
SCK
DSP2DATA
MOSI
/ENDVR
/RST5
DSP1DATAA
CTDOB
/ENC1
MMISO
MMOSI
MSCK
/DVRCS
CMD
/MCLR
PGD
PGC
VCC3
2
1
5
4
9
10
12
13
7
/DSP1BUSY RX1_IF/DSP2BUSY
/RST5
MUTE MUTEA
+5V
C76
0.1 uF
DSP1DATAA
CTDOB MISO
/ENC1
SMISO
/ENC2
MMISO
MMOSI
MSCK
/DVRCS
CMD
U14
2Y
3Y
4Y
3
6
8
11
14
1A
1OE
2A
2OE
3A
3OE
4A
4OE
GND1YVCC
SN74LVC125A
5
4
3
19
18
16
14
12
20
10
10
12
13
PGC
/MCLR
PGD
VCC3
U20
2
A1
3
A2
4
A3
5
A4
6
A5
7
A6
8
A7
9
A8
1
G1
G2
74LCX541
U19
1Y1
1Y2
1Y3
1Y4
9
2Y1
7
2Y2
5
2Y3
3
2Y4
VCC
GND
74VHCT244
U15
2
1A
1
1OE
5
2A
4
2OE
9
3A
3OE
4A
4OE
7
GND1YVCC
74HCT125
Y1
Y2
Y3
Y4
Y5
Y6
Y7
Y8
VCC
GND
1A1
1A2
1A3
1A4
2A1
2A2
2A3
2A4
1G
2G
2Y
3Y
4Y
18
17
16
15
14
13
12
11
20
10
2
4
6
8
11
13
15
17
1
19
3
6
8
11
14
C67
0.1 uF
SMOSI
SSCK
DIG0A
100HZA
/CSDSP2A
VCC3
SMISO
/DSP1BUSYA
/RST
/MISOEN
DSP1DATA
DSP2DATA DSP2DATAA
+5V
SMOSI
SSCK
/CSDSP1A
DIG0A
100HZA
/CSDSP2A
SMISO
/DSP1BUSYA
/RST
MUTEA
/MISOEN
THERM01
THERM02
THERM03
1
1
1
PJG1
PJG2
1
1
1
1
1
1
1
1
1
STNDO1
KDVR3
STNDO2
AUX DSP
STNDO3
K3FP
STNDO4
K3FP
STNDO5
AUX DSP
STNDO6
AUX DSP
STNDO7
K3FP
STNDO8
K3FP
STNDO9
SHIELD
FIDCL1
NOTES:
Elecraft, Inc. Copyright (C) 2007 - 2010.
L Johnson
Title
Size Document Number Rev
B
2
Date: Sheet
PCB Revision C
K3 DSP: INTERCONNECTS AND MISCELLANEOUS
2004051101 C
1
79 Wednesday, June 16, 2010
FIDCL2
of
5
D D
4
3
2
1
VCC8A
R55 909R
C81 1000 pF
C82 10 uF/10V
RX1_BIF-
C90 10 uF/10V
RX1_BIF+ RX1_IF+
+
Vocm
-
3 6
U24
EN
OPA1632D
R56 51R
5
C88
4
2700 pF
R59 51R
C84
RX1_IF-
+
10 uF/16V
C92
+
C C
R57 3K
8
2
R60 3K
1
10 uF/16V
7
C91 1000 pF
R61 909R
VCC8A
B B
C83
0.1 uF
NOTES:
PCB Revision C
Elecraft, Inc. Copyright (C) 2007 - 2010.
A A
L Johnson
Title
K3 DSP: RX IF BUFFER
Size Document Number Rev
A
Date: Sheet
5
4
3
2004051101 C
89 Wednesday, June 16, 2010
2
of
1
5
D D
4
3
2
1
U25
MMOSI
MSCK
/TXDACCS
VCC3
MMOSI
MSCK
/TXDACCS
13
12
ROUT
LOUT
SDIN
SCLK
CS
MODE
23
24
21
22
VCC3
DSPDX0
AICBCLK
LRCLKDAC
TCLK0
L3 100 uH
C97
0.1 uF
VCC3AT
C95
0.1 uF
DSPDX0
AICBCLK
LRCLKDAC
TCLK0
+
C94
10 uF/25V
TXROUT
TXLOUT
10
9
RHPOUT
LHPOUT
BCLK
LRCIN
C99
10 uF 10v ECJ
C C
TXIFQ
TXIFI
TXIFQ
TXIFI
C96
10 uF 10v ECJ
VMIDT
C98
+
10 uF/16V
C101
0.1 uF
XTI/MCLK
16 26
VMID XTO
CLKOUT
AVDD
BVDD
DVDD
HPVDD
AVSS
DVSS
HPGND
B B
TLV320DAC23
DIN
4
3
5
25
2
14
1
27
8
15
28
11
NOTES:
PCB Revision C
Elecraft, Inc. Copyright (C) 2007 - 2010.
A A
L Johnson
Title
K3 DSP: TX DAC
Size Document Number Rev
A
Date: Sheet
5
4
3
2004051101 C
99 Wednesday, June 16, 2010
2
of
1
5
4
3
2
1
D D
C2
1500 pF 5% C0G
TP1
AFIN1
R1
1
60.4K 1%
R3
34.0K 1%
C4
1000 pF 5% C0G
VCC8A VCC8A
C6
0.015 uF 5% X7R
4 11
3
+
2
-
U1A
1
R5
10.5K 1%
TLC2274
R7
10.5K 1%
C8
12
13
1000 pF 5% C0G
4 11
U1D
+
14
1
-
TP5
AFOUT1
TLC2274
VCC8A VCC8A
C C
C3
1500 pF 5% C0G
4 11
5
+
6
-
U1B
7
R6
10.5K 1%
TLC2274
TP4
AFIN2
R2
R4
1
60.4K 1%
34.0K 1%
C5
1000 pF 5% C0G
B B
TP2
+8V
VCC8A
1
C7
0.015 uF 5% X7R
R8
10.5K 1%
C9
1000 pF 5% C0G
10
4 11
U1C
+
9
-
8
1
TP6
AFOUT2
TLC2274
C1
0.1 uF
TP3
GND
1
Elecraft, Inc. Copyright (C) 2009 - 2010.
A A
L Johnson
Title
K3: AF Filter
Size Document Number Rev
A
E2008090801 A
5
4
3
Date: Sheet
2
11 Wednesday, June 16, 2010
of
1
C:\Projects\K3\Schematics\K3 LPA revA.sch - Sheet1
W. Burdick
Elecraft
Rev. Sht. Date By
Appendix B
1 of 4
10
K1A
K1B
L3
2
4
3
7
5
6
L1
18
L4
2.2
K2A
2
4
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
2 4
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
2
4
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
2 4
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
3 2 1
J44C
12345
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
A
6/29/07
5
4
3
2
1
L2
D D
R14
68R
1
P41A
4-pin RA
123
4
C7
0.01 uF
C5
C C
0.01 uF
K1
2
4
9
7
3
8
1
10
C14
0.1 uF
DPDT
100 uH
D5
BAP64-04
3
C17
0.1 uF
2 3
2
R15
300R
12V_SW
Q2
1
MMBT3906
L1
100 uH
R8
2K2
R9
2K2
C15
0.1 uF
C16
0.1 uF
7R
C4
0.01 uF
R11
1K
P41B
4-pin RA
1
/LP
D1
1
234
BAP64-05
3
R1
1K
C2
0.01 uF
C3
0.01 uF
2
C1
0.01 uF
12V_SW
K2
3
8
1
10
2
4
9
7
C12
0.01 uF
DPDT
C6
LPTX
B B
A A
2 1
D3
1N5711W
R7
1M
5
0.01 uF
RFC1
47 uH
C9
1000 pF
R6
100K
5
6
D2
1N5711W
RF Detector
U1B
TLV272
8 4
+
-
2 1
7
R2
470K
R5
180K
4
C10
0.01 uF
D4
5V1
NOTES: 1. KXV3-1 and -2 modules are soldered together
Title
Size Document Number Rev
Date: Sheet
R12
1K
U1A
TLV272
8 4
3
+
2
-
1
3
1
Q1
MMBT3904
2
R13 100R
LD_XV
MOSI3
R3
1M
3.6VDC ~
1.0 mW
R4
330R
12V_SW
7T
SCK3
678
9
10
11
12
13
14
15
16
100 pF
12345
C13
U2
2
SDI
15
SCK
7
SCLR
10
RCK
8
OE
1
VCC
16
GND
TPIC6B595DW
C11
0.1 uF
Q0
Q1
Q2
Q3
Q4
Q5
Q6
Q7
SDO
3
4
5
6
11
12
13
14
9
C8
0.01 uF
/LP
MISO3
P66
K3 RF Board
3
2
R10
12V_SW
2K2
1 3
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.
4. W4 must be installed on the RF board when the KXV3
is installed (between RF-P86 and KXV3-P87).
Elecraft, Inc. Copyright (C) 2007 - 2010.
L Johnson
KXV3: Main
2006030602 B1
B
1
11 Wednesday, June 16, 2010
of
5
4
3
2
1
L2
100 uH
C15
C20
0.01 uF
RFC2
47 uH
0.1 uF
R14
K1
DPDT
68R
3
8
1
10
1
C14
0.1 uF
D5
BAP64-04
3
2 3
R15
300R
C17
0.1 uF
12V_SW
Q2
1
2
12V_SW
L1
100 uH
C16
0.1 uF
C4
0.01 uF
C3
0.01 uF
D1
R8
2K2
R9
7R
R11
1K
1
BAP64-05
3
R1
1K
2
C1
0.01 uF
12V_SW
/LP
D D
P41A
4-pin RA
123
4
C7
2
0.01 uF
C5
4
9
C C
0.01 uF
7
K3
3
8
1
10
2
4
9
7
DPDT
RFC3
47 uH
K2
3
8
1
10
2
4
9
7
DPDT
J1
XVTR IN INT
P41B
4-pin RA
L3 0.15 uH
C22
56 pF
J2
XVTR OUT INT
C12
0.01 uF
1
2
3
4
3
2
1
C23
56 pF
1
2
3
MMBT3906
2K2
C2
0.01 uF
C6
LPTX
B B
A A
2 1
D3
1N5711W
R7
1M
5
RFC1
47 uH
C9
1000 pF
0.01 uF
R6
100K
5
6
D2
1N5711W
RF Detector
U1B
TLV272
8 4
+
-
2 1
7
R2
470K
R5
180K
4
C19
0.01 uF
U1A
TLV272
8 4
3
+
2
-
1
3
1
Q1
MMBT3904
2
R3
12V_SW
1M
R4
330R
3.6VDC ~
1.0 mW
11
12
13
14
15
16
P66
K3 RF Board
R12
1K
C11
0.1 uF
U2
R13 100R
MOSI3
LD_XV
C13
100 pF
7T
SCK3
678
9
10
3
12345
2
SDI
15
SCK
7
SCLR
10
RCK
8
OE
1
VCC
16
GND
TPIC6B595DW
Q0
Q1
Q2
Q3
Q4
Q5
Q6
Q7
SDO
3
4
5
6
11
12
13
14
9
C8
0.01 uF
/LP
MISO3
NOTES: 1. KXV3-1 and -2 modules are soldered together
C18
0.01 uF
C10
0.01 uF
Elecraft, Inc. Copyright (C) 2007 - 2010.
L Johnson
Title
KXV3A: Main
Size Document Number Rev
B
2
Date: Sheet
D4
5V1
C21
0.01 uF
via right-angle male connectors at J/P41A/C.
2. K1 - K3 are DPDT relays shown in RESET position.
2006030602 D
R10
12V_SW
2K2
1 3
of
1
11 Wednesday, June 16, 2010
5
D D
4
3
2
1
GAP1
J36
RX Ant In
J37
RX Ant Out
12345
12345
SPARK GAP
C1
D1 BAT54S
2
3
1
Q1
BCV27
J38
XVTR In
1
2
345
J39
XVTR Out
12345
2 pF
C C
1
234
4-pin RA
R1
100K
C2
Not Used
J41A
1 3
R2
1M
C3
0.1 uF
2
1
2
3
4
4-pin RA
J41B
J40
I.F. Out
12345
J87
1
2
B B
3
RX IF
1
1
MT1
SWAGE
MT2
SWAGE
Elecraft, Inc. Copyright (C) 2007 - 2010.
A A
L Johnson
Title
KXV3: Connector
Size Document Number Rev
A
2006030602 A1
5
4
3
Date: Sheet
2
11 Wednesday, June 16, 2010
of
1
W. Burdick
E. Swartz
Elecraft
Rev. Sht. Date By
0.48 µH 0.05 µH 0.11 µH
0.23µH
L1 L2 L3 L4
C1
C2
C3
C4
12
22
39
82
C TX
C ANT
4.4 µH 1.0 µH
2.1 µH
L5 L6 L7
9.0 µH
L8
1 of 1
150
C5A C5B
12
330C6330
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
9K311
13
6 8
4
9K411
13
6 8
4
9K511
13
6 8
4
9K611
13
6 8
4
9K711
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
1011121314151617181920
123456789
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
1 2
J72
C11
XD3 7/11/07
5
4
3
2
1
ST1
D D
1
STANDOFF
VCC3
MOSI2
MISO2
SCK2
/CS
/RST
/WP
RDY
C C
/BYTE
U3
1
RG15
2
RC1
3
SCK2
MISO2
R4
VCC3
MOSI2
/MCLR
/CS
47K
VCC3
B B
/DVRCS
TP2
TP1
PGC
PGD
TP1
TP2
TP3
A A
TP4
TP5
1
1
1
1
1
R3 120R
R2 120R
TP1
TP
TP2
TP
TP3
TP
TP4
TP
TP5
TP
5
VCC3
RC2
4
RG6/SCK2
5
RG7/SDI2
6
RG8/SDO2
7
MCLR
8
RG9/SS2
9
VSS
10
VDD
11
RB5
12
RB4
13
RB3
14
RB2/SS1
15
RB1/PGC3
16
RB0/PGD3
17
RB6/PGC1
18
RB7/PGD1
19
AVDD
20
AVSS
21
RB8/U2CTS
22
RB9
23
RB10/TMS
24
RB11/TDO
25
VSS
26
VDD
27
RB12/TCK
28
RB13/TDI
29
RB14/U2RTS
30
RB15
31
RF4/U2RX
32 33
RF5/U2TX U1TX/SDO1/RF3
PIC24HJ64GP206
4
U2
13
SI
14
SO
12
SCK
11
CS
2
RESET
3
WP
1
RDY
16
SER/BYTE
AT45DB642D-TU
PGC2/RC14
PGD2/RC13
U1CTS/RD9
CLK0/RC15
CLKIN/RC12
SCL1/RG2
SDA1/RG3
U1RTS/SCK1/RF6
U1RX/SDI1/RF2
DQ0
DQ1
DQ2
DQ3
DQ4
DQ5
DQ6
DQ7
Vcc
VCCP
GNDP
GND
RG13
RG12
RG14
RG0
RG1
RF1
RF0
VDD
VDDcore
RD7
RD6
RD5
RD4
RD3
RD2
RD1
RD0
RD11
RD10
RD8
VSS
VDD
17
18
19
20
23
24
25
26
6
22
21
7
64
63
62
61
60
59
58
57
56
55
54
53
52
51
50
49
48
47
46
45
44
43
42
41
40
39
38
37
36
35
34
D0
D1
D2
D3
D4
D5
D6
D7
VCC3
/WP
/RST
RDY
VCC3
D7
D6
D5
D4
D3
D2
D1
/BYTE
D0
TP5
TP4
TP3
CMD
VCC3
SCK1
MOSI
MISO1
3
D[7:0]
Z1
8.0 MHz
1 3
2
+
C1
10 uF/25V
C2
0.1 uF
C3
0.1 uF
C4
0.1 uF
C6
0.1 uF
R1
VCC3
10K
U1
MISO1
SCK1
/DVRCS
2
1A
3
2Y
1
1OE
7
2OE
1Y
2A
VCC
GND
MISO
6
SCK
5
8
VCC3
4
74LVC2G125
P54
C5
10 uF 10v ECJ
MISO
MOSI
SCK
/DVRCS
CMD
/MCLR
PGD
PGC
VCC3
1
2
3
4
5
6
7
8
9
10
Main DSP
Elecraft, Inc. Copyright (C) 2008 - 2010.
L Johnson
Title
K3: Digital Voice Recorder
Size Document Number Rev
A
2004090101 XG
Date: Sheet
2
11 Wednesday, June 16, 2010
of
1
C:\Projects\K3\Schematics\KPAIO3revXI.sch - Sheet1
5
D D
4
3
2
1
P52
1
2
3
4
5
6
7
8
9
10
11
12
C C
13
14
15
16
17
18
19
20
21
22
23
24
MISO
MOSI
SCK
/CSDSP2
/RST2
DSP2DATAA
/SPIBOOT2
DR2
FSR2
CLKR2
CLKX2
FSX2
DX2
/DSP2BUSYA
/AUXDETECT
/ENC2
AUXDSPD0
RX2_BIFVSMETER2
RX2_BIF+
DSP2DATA
AUXDSPD1
+8V
VCC3
MISO
MOSI
SCK
/CSDSP2
CLKR2
FSR2
DR2
CLKX2
FSX2
DX2
DSP2DATAA
DSP2DATA
/DSP2BUSYA
/ENC2
/RST2
/SPIBOOT2
AUXDSPD0
AUXDSPD1
25
DSP
MISO
MOSI
SCK
/CSDSP2
CLKR2
FSR2
DR2
CLKX2
FSX2
DX2
DSP2DATAA
DSP2DATA
/DSP2BUSYA
/ENC2
/RST2
/SPIBOOT2
AUXDSPD0
AUXDSPD1
DSP
Power
MMISO
MMOSI
MSCK
MMOSIA
MSCKA
/DACCS
/ADCCS
MMISO
MSCK
MMOSIA
MSCKA
/DACCS
/ADCCS
ANALOG INTERFACE
MMISO
MMOSI
VIFGAIN2
VSMETER2
MSCK
HAGC2
MMOSIA
MSCKA
/DACCS
/ADCCS
ANALOG INTERFACE
VIFGAIN2
VSMETER2 MMOSI
HAGC2
26
Main DSP
B B
P53
1
2
3
4
RX2_IF+
RX2_IFHAGC2
VIFGAIN2
RX2_IF+
RX2_IF-
5
Power
IF BUFFER
RX2_IF+ RX2_BIF+
RX2_IF-
RX2_BIF-
IF BUFFER
RX2_BIF+
RX2_BIF-
1
1
STNDO1
MAIN DSP
STNDO2
MAIN DSP
Main DSP
STNDO3
1
MAIN DSP
/RST2
/SPIBOOT2
R21 10K0
R20 10K0
VCC3
NOTES:
PCB Revision A
Elecraft, Inc. Copyright (C) 2007 - 2010.
A A
L Johnson
Title
K3 Aux DSP: Top Level
Size Document Number Rev
A
2004051101 A0
Date: Sheet
5
4
3
2
15 Wednesday, June 16, 2010
of
1
5
D D
4
3
2
1
U7
MMOSI
MSCK
MSCK
/DACCS
VCC3
9
DIN
8
SCLK
1
LDAC
2
VDD
VOUTA
VOUTB SYNC
VREFA
VREFB
10
C C
GND
5
6 7
4
3
VIFGAIN2 MMOSI
VSMETER2
VCC3A
VIFGAIN2
VSMETER2 /DACCS
AD5302A
U4
4
AIN1
5
AIN2
6
10
11
7
8
9
2
3
AIN3
AIN4
AIN5
AIN6
AIN7
AIN8
AVDD
AGND
HAGC2 /ADCCS
B B
HAGC2
SCLK
DOUT
DVDD
DGND
DIN
CS
14
16
15
1
13
12
MMOSIA
MSCKA
MMISO
/ADCCS
VCC3 VCC3A
MMOSIA
MSCKA
MMISO
ADC78H90CIMT
NOTES:
PCB Revision A
Elecraft, Inc. Copyright (C) 2007 - 2010.
A A
L Johnson
Title
K3 Aux DSP: Analog Interface
Size Document Number Rev
A
Date: Sheet
5
4
3
2004051101 A0
25 Wednesday, June 16, 2010
2
of
1
5
Y1 14.7456 MHz
C13
10 pF
133
U3
XIN
R5 100R
132
D D
C8
10 pF
XOUT
VCC3
R1 33R
H1CLK
DSPDR
DSPFSR
DX2
CLKX2
C C
C24
22 pF
VCC3
FSX2
DSP2DATAA
/DSP2BUSYA
R14 10K0
R4 10K0
R3 10K0
R2 10K0
R13 10K0
R12 10K0
P60
TMS
TDI
VCC3
TDO
TCK
TCK
EMU0
B B
1 2
3 4
5 6
7 8
9 10
11 12
13 14
JTAG-DSP
TRST
EMU1
DSPCLKR
DX2
CLKX2
FSX2
DSP2DATAA
/DSP2BUSYA
TCK
TDI
TDO
TMS
TRST
EMU0
EMU1
VCC3
VCC2
A A
130
136
135
114
113
104
107
106
111
109
110
117
116
100
102
103
108
115
129
143
138
139
101
123
137
131
134
38
39
98
99
96
95
6
15
23
31
37
43
53
60
69
77
86
94
12
28
46
66
83
2
9
18
25
34
40
49
56
63
72
80
89
EXTCLK
H1
H3
CLKMD0
CLKMD1
TCLK0
TCLK1
DR0
CLKR0
FSR0
DX0
CLKX0
FSX0
XF0
XF1
TCK
TDI
TDO
TMS
TRST
EMU0
EMU1
DVDD
DVDD
DVDD
DVDD
DVDD
DVDD
DVDD
DVDD
DVDD
DVDD
DVDD
DVDD
DVDD
DVDD
DVDD
DVDD
RSV0
RSV1
CVDD
CVDD
CVDD
CVDD
CVDD
CVDD
CVDD
CVDD
PLLVdd
PLLVss
VSS
VSS
VSS
VSS
VSS
VSS
VSS
VSS
VSS
VSS
VSS
VSS
TMS320VC33PGE
5
4
A10
A11
A12
A13
A14
A15
A16
A17
A18
A19
A20
A21
A22
A23
D10
D11
D12
D13
D14
D15
D16
D17
D18
D19
D20
D21
D22
D23
D24
D25
D26
D27
D28
D29
D30
D31
STRB
R/W
PAGE0
PAGE1
PAGE2
PAGE3
RDY
HOLD
HOLDA
INT0
INT1
INT2
INT3
IACK
EDGEMODE
MCBL/MP
SHZ
RESET
VSS
VSS
VSS
VSS
VSS
VSS
4
A0
A1
A2
A3
A4
A5
A6
A7
A8
A9
D0
D1
D2
D3
D4
D5
D6
D7
D8
D9
30
29
27
26
24
22
21
20
19
17
16
14
13
11
10
8
7
5
4
3
1
144
142
141
93
92
91
90
88
87
85
84
82
81
79
78
76
75
74
73
71
70
68
67
65
64
62
61
59
58
57
55
54
52
51
50
41
42
36
35
33
32
45
47
48
122
121
120
119
44
124
125
128
127
97
105
112
118
126
140
A0
A1
A2
A3
A4
A5
A6
A7
A8
A9
A10
A11
A12
A13
A14
A15
A16
A17
A18
D0
D1
D2
D3
D4
D5
D6
D7
D8
D9
D10
D11
D12
D13
D14
D15
/WR
/PAGE0
/PAGE1
/PAGE3
/RDY
/HOLD
/INT0
/INT1
/INT2
/INT3
MCBL
/SHZ
/DSPRST
R8 10K0
R7 10K0
R9 10K0
R10 10K0
R11 10K0
R6 10K0
VCC3
DR2
FSR2
3
U2
A0
A1
A2
A3
A4 D4
A6
A8
A9
A10
A11
A12
A13
A14
A15
A16
A17
A18
/PAGE1
/RD
/WR
25
A0
24
A1
23
A2
22
A3
21
A4
20
A5
19
A6
18
A7
8
A8
7
A9
6
A10
5
A11
4
A12
3
A13
2
A14
1
A15
48
A16
17
A17
16
A18
26
CE
11
WE
D0
D1
D2
D3
D4
D5
D6
D7
D8
D9
D10
D11
D12
D13
D14
D15
VDD
VSS OE
VSS
D0
29
D1
31
D2
33
D3
35
38
D5 A5
40
D6
42
D7 A7
44
D8
30
D9
32
D10
34
D11
36
D12
39
D13
41
D14
43
D15
45
37
27 28
46
SST39VF800A
U5
VCC3
D8
D9
DR2
FSR2
D0
D1
D2
D3
D4
D5
D6
D7
D10
D11
D12
D13
D14
D15
/RDY
H1CLK
/PAGE0
/PAGE1
/PAGE3
A0
A1
A2
/RD
/WR
12
IO/GCLK0
14
IO/GCLK1
62
IO/GCLK2
64
IO/GCLK3
43
IO/DEV_OE
44
IO/DEV_CLRn
1
IO
2
IO
3
IO
4
IO
5
IO
6
IO
7
IO
8
IO
15
IO
16
IO
17
IO
18
IO
19
IO
20
IO
21
IO
26
IO
27
IO
28
IO
29
IO
30
IO
33
IO
34
IO
35
IO
36
IO
37
IO
13
VCCINT
63
VCCINT
9
VCCIO1
31
VCCIO1
45
VCCIO1
59
VCCIO2
80
VCCIO2
94
VCCIO2
11
GNDINT
65
GNDINT
10
GNDIO
32
GNDIO
46
GNDIO
60
GNDIO
79
GNDIO
93
GNDIO
TDI
TMS
TCK
TDO
38
IO
39
IO
40
IO
41
IO
42
IO
47
IO
48
IO
49
IO
50
IO
51
IO
52
IO
53
IO
54
IO
55
IO
56
IO
57
IO
58
IO
61
IO
66
IO
67
IO
68
IO
69
IO
70
IO
71
IO
72
IO
73
IO
74
IO
75
IO
76
IO
77
IO
78
IO
81
IO
82
IO
83
IO
84
IO
85
IO
86
IO
87
IO
88
IO
89
IO
90
IO
91
IO
92
IO
95
IO
96
IO
97
IO
98
IO
99
IO
100
IO
23
22
24
25
EPM240TQFP100
3
2
VCC3
VCC3
SMISO
SMOSI
/CSDSP2
/RST2
/SPIBOOT2
DSPDR
DSPFSR
MMOSI
MSCK
/DACCS
AUXDSPD0
AUXDSPD1
/ADCCS
MMOSIA
MMISO
MSCKA
VCC3
CLKR2
DSPCLKR
/DSPRST
/INT0
/INT1
/INT2
/INT3
CTDI
CTMS
CTCK
CTDO
2
VCC3
/ENC2
DSP2DATA
1
R18 10K0
MOSI CTDI
/ENC2
2
1
5
4
9
10
12
13
7
U6
1A
1OE
2A
2OE
3A
3OE
4A
4OE
GND1YVCC
2Y
3Y
4Y
3
MISO CTDO
6
CTMS DSP2DATA
8
CTCK SCK
11
14
VCC3
SN74LVC125A
P61
VCC3
CTCK
CTDO
CTMS
CTDI
1
2
3
4
5
6
7
8
9
10
JTAG - CPLD
MISO
MOSI
SCK SSCK
/ENC2
MISO
MOSI
SCK
/CSDSP2
/RST2
R17 3K00
R16 3K00
R15 3K00
R19 3K00
/SPIBOOT2
MMOSI
MSCK
/DACCS
AUXDSPD0
AUXDSPD1
/ADCCS
MMOSIA
MMISO
MSCKA
MMOSI
MMISO
MSCK
/ADCCS
/DACCS
/DSPRST
SMOSI
SMISO
SSCK
/PAGE0
/PAGE3
/INT0
/INT1
/INT2
/INT3
MMOSI
MMISO
MSCK
ADCCS
DACCS
/DSPRST
SMOSI
SMISO
SSCK
PG0
PG3
/INT0
/INT1
/INT2
/INT3
CLKR2
NOTES:
Elecraft, Inc. Copyright (C) 2007 - 2010.
L Johnson
Title
Size Document Number Rev
B
Date: Sheet
PCB Revision A
K3 Aux DSP: DSP and Logic
2004051101 A0
1
35 Wednesday, June 16, 2010
of
5
D D
4
3
2
1
+8V
R26 909R
C41 1000 pF
C35
+
10 uF/25V
C34
+
10 uF/25V
RX2_BIF-
RX2_BIF+
+
Vocm
-
3 6
U8
EN
OPA1632D
R23 51R
5
C37
4
2700 pF
R22 51R
C43
RX2_IF+
+
10 uF/25V
C42
C C
RX2_IF-
+
R27 3K00
8
2
R25 3K00
1
10 uF/25V
7
C40 1000 pF
R24 909R
C38
B B
+8V
0.1 uF
NOTES:
PCB Revision A
Elecraft, Inc. Copyright (C) 2007 - 2010.
A A
L Johnson
Title
K3 Aux DSP: IF Buffer
Size Document Number Rev
A
Date: Sheet
5
4
3
2004051101 A0
45 Wednesday, June 16, 2010
2
of
1
5
4
3
2
1
D D
VCC2 VCC3
U1
+8V
C39
0.1 uF
C36
+
10 uF/25V
2 1
IN OUT
7
SHDN
8
FAULT
3 6
GND CC
OUT
ADJ
LP3982
4
5
C1
0.033 uF
C3
10 uF 10v ECJ
VCC2
C C
C4
0.1 uF
C7
0.1 uF
C14
0.1 uF
C15
0.1 uF
C22
0.1 uF
C11
0.1 uF
C20
0.1 uF
C16
0.1 uF
VCC3
TP3
1
A
2
B
GND
C2
0.1 uF
C5
0.1 uF
C25
0.1 uF
C10
0.1 uF
C6
0.1 uF
C9
0.1 uF
C18
0.1 uF
C19
0.1 uF
TP2
1
A
B B
2
B
VCC3
GND
TP1
1
A
2
B
C27
0.1 uF
C23
0.1 uF
C21
0.1 uF
C17
0.1 uF
C12
0.1 uF
C29
0.1 uF
C30
0.1 uF
C31
0.1 uF
GND
L1 100 uH
VCC3A VCC3
NOTES:
PCB Revision A
Elecraft, Inc. Copyright (C) 2007 - 2010.
A A
C28
0.1 uF
C26
0.1 uF
C32
+
10 uF/25V
C33
0.1 uF
L Johnson
Title
K3 Aux DSP: Power
Size Document Number Rev
A
2004051101 A0
Date: Sheet
5
4
3
2
55 Wednesday, June 16, 2010
of
1
W. Burdick
Elecraft
Rev. Sht. Date By
2 of 2
1 2 3 4 5 6
P2
101112
123456789
P1
K1B
5
6
7
K1A
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. Date By
2 of 2
10 11 12 1 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
1011121314
123456789
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. Date By
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
12345
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
2 439
7
8
L9
4.5
40
C132
L8
4.5
40
C131
C118
C155
K5A
K5B
C152 C124
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
2
4
3
K2B
9 7
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
4
3
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)
SCK3SB
MISO3S
MOSINB2
LD_IF_SB
RFC39
47 µH
12SA
5
6
7
+
-
U1B
3
2
1
+
-
8
4
U1A
1
4
2.7K
RP1
3
C201
.047
C215
150
33K R42
1
2
C214
1µF
C200
0.01
C213
150
33K R41
2.7K RP1
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
RFC17 RFC16
R18 100
C8
C7
RFC15 RFC14
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
4
3
9 7
8
K10
Attn.
C15
C16
RFC6
100
RFC8
100
PRE_OFF
C26
15
R20 100
C14
C13
RFC21 RFC19
C203
.047
R68
8.2Ω
FL5
C41
C4
R69
470
RFC4
100
R1
470
C208
.047
C193
.047
RFC37
100
-10 dB
T6
423
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
Q10 Q7
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
5 1
(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
6
7
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
1 2 3 4
P45C
1 2 3 4
P46C
1 2 3 4
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 12 1 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
G1 G2
G3
C37
3.3µF
C38
3.3µF
*
*
*
Not present on rev A PCB.
B2 8/18/08
R37
100
R43
68
R45
100
C195
.047
.047
12SA
R60
150
R66
C211 .047
15
C204 C202
Q8
.047
NE46134
R75
6.2Ω
Appendix B
Elecraft
W. Burdick
Rev. Sht. Date By
C:\Projects\K144XV\Schematics\KXV144_8B.sch - Sheet2