Elecraft – Elecraft KAF2 User Manual
Page 16
16
32.768 kHz
3.9K
10K
10K
RP1
R9
R10
X1
3
4
3.9K
RP1
6
5
W. Burdick
E. Swartz
Elecraft
Rev.
Sht.
Date
By
1 of 1
= On bottom of PC board.
GND
OUT
IN
MCLR
OSC1
OSC2
RA2
RA3
RA4
VSS
RB0
RB1
RB2
RB3
RA1
RA0
VDD
RB7
RB6
RB5
RB4
10
11
12
13
14
15
16
17
18
1
2
3
4
5
6
7
8
9
U2
Z1
DATA
/XT
GND
CLK
I/O
VDD
XT
CE
1
2
3
4
5
6
7
8
U3
6V
W1
G
D
S
Q1
G
D
S
Q3
G
D
S
Q2
78L06
10µF
C10
OUT
GND
IN
U4
+
NJU6355ED
6V Reg.
R15
R16
0.22
C17
12A
470
C9
P2
1
2
3
4
5
6
3
2
1
S1
1
2
3
4
5
P1
C1
C2
.068
.068
C4
.01
R13
C3
.01
L1
L2
+
-
BT1
D2
D1
R14
R17
.01
C11
LPF1
LPF2
To Ctrl Board, J2
To Ctrl Board, J1
must be removed when the KAF2 is installed.
3.9K
RP1
1
2
3.9K
RP1
7
8
C13
C12
C14
C15
12V
82 mH
82 mH
LPF1
LPF2
KAF2 Audio Filter/RTC
A
R11
R12
220
220
910
5
6
7
+
-
U1B
10
9
8
+
-
U1C
R4
R5
R6
R8
R3
R7
R1
R2
C5
C6
C8
C7
C18
6V
Filter Bypass
6V
Note 2
1. R18 and R19 on the Control board (which may be jumpers)
NOTES:
0.22
0.22
470
47K
470
5K
Low-Pass Filter
OFF
AF1
AF2
5K
470
0.22
U1: LM837N
.01
100K
510K
180K
3
2
1
+
-
4
11
U1A
12
13
14
+
-
U1D
6V
12A
.022, 5%
.022, 5%
.01, 5%
.01, 5%
J309
1N5711
1N5711
4 MHz
220
2.7K
220
5.5V
3V
78L06
G
S
D
J309
A
C
1N5711
5%
5%
5%
5%
220
AF1
AF2
SET
SET
AUXBUS
Band-Pass Filter
16C621A
W2
Install W2 to select DD-MM-YY date format.
2. Install W1 to skip the first-stage band-pass filter output (AF1).
OUT
IN
C16
470
Controller
C19
33 pF
Real-Time Clock
8-16-01