Figure 9 – krc2 schematic – Elecraft KRC2 Manual User Manual
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30
C1
C2
Vout
Vin
Gnd
1
3
2
U3 78L05
C13
C14
+
C12
.1
.1
220 µF
R3
1K
C20 .1
33
33
R x
T x
C16
.01
D7
1N4148
D6
1N4148
+
C15
10 µF
S4
S3
S2
S1
F1
F2
F3
F4
D3
1N4007
C9
C11
C8
C6
C10
L2
L3
L1
8R
R9 100
.001
ALC
0.001
0.001
0.001
0.001
100uH
100uH
100uH
ISD-D
ISD-C
SP1
Piezo Spkr
W5
W4
T2OUT
R2
O
U
T
R1
O
U
T
T1OUT
T3OUT
R3
O
U
T
R
2
IN
T
2
IN
T
1
IN
R
1
IN
R
3
IN
T
3
IN
GND
VCC
V
D
D
V
S
S
16
12
14
15
13
11
10
2
3
9
1
8
5
4
7
6
U2
1
2
3
4
5
6
7
8
9
J 2
W16
W17
W18
W19
W23
D2
1N4007
J 3
DS1
RP1
1
2
390
RP1
5
6
390
RP1
7
8
390
RP1
3
4
390
X1
4.0 MHz
X2
G
D
S
Q1
D8
C18
L4
J310
120
16.289 MHz
1N4148
C19
56
R13
47
C17
.01
15uH
TTL Level
+12V DC Power
MAX1406
R4
470
R 5
5K
(BACK VIEW)
1
2
3
4
5
6
7
8
9
DB-9 Male
Status
8R
VRDET
C3
.001
R6
10K
R7
10K
C4 .001
8R
VRDET
VPP
1
2
3
4
5
6
7
8
9
J 1
C7
0.001
(BACK VIEW)
1 2
3
4
5
6
7
8
9
+5V
+5V
+12V
+5V
+5V
+5V
+12V
+5V
DB-9 Female
PC
C25
.1
R1
R2
10K
47K
2V nominal
-12V
-12V
RxD
TxD
W10
W9
RP2
1
4
47K
D5
1N4007
D4
1N4007
W6
W7
W2
W8
W13
W14
W15
W11
W12
8R
12CTRL
12CTRL
AuxBus
AuxBus
ALC
TxD
RxD
SIG GND
SIG GND
CH GND
CH GND
BRL12
BRL12
+12V
GND
VBB
GND
GND
4
3
2
1
J 4
4
3
2
1
J 5
AUXBUS
AUXBUS
G
S
D
Q1
GND
OUT
I N
U3
D
C
B
A
.01uF each
C21-C24
C26
.1
RP2
1
3
47K
RP2
1
2
47K
RP2
1
5
47K
RP2
1
6
47K
RP2
1
8
47K
RP2
1
7
47K
W3
RA5
RA5
OSC1
OSC2
MCLR
AN0
AN1
AN2
RA3
RA4
RA5
RE0
RE1
RE2
VDD
VSS
RC0
RC1
RC2
SCK
RD0
RD1
RD2
RD3
SDI
SDO
RD4
RD5
RD6
RD7
VSS
VDD
RB0
RB1
RB2
RB3
RB4
RB5
RB6
RB7
TX
RX
10
15
20
21
25
30
35
40
PIC16F877A
U1
5
1
R10
10K
R11
10K
S5A
S5B
Optional
W1
D9
1N4148
D10
1N4148
R12
4.7K
W21
W22
R8
10K
C5
.001
AN3
AN3
Band I/O
MON
MON
OP
DL
OP
DL
XCVR
VRDET
VRDET
VBB
SDO
SCK
SRWRT
W20
D1
4.7K 1/8 Watt
Figure 9 – KRC2 Schematic