MFJ MFJ-815D - Meter Board Details; Meter Board Circuit Diagram

MFJ-815D Deluxe HF True Peak Reading SWR/Wattmeter Instruction Manual
7
Meter Board
+
C106
10
R113
IM
U102
LM324
+
3
-
2
OUT
6
C107
.01
R114
22k
R120
25k
21
FM
FG
FORWARD METE
R
Q101
2N3904
SW 101A
R102
150k
R101
500k
21
R103
N/L
21
R104
82k
R105
470
C101
.001
U103
LM324
+
3
-
2
OUT
6
D101
IN34A
+12V
SW 102A
+
C102
10
R106
IM
U104
LM324
+
3
-
2
OUT
6
C103
.01
R107
10k
RM
R119
25k
21
RG
REFLECTED METER
FWD
REF
Q103
MPS-A13
Q102
2N3904
J101
Q104
2N3906
1
3
2
SW 101B
SW 103A
R116
1M
R117
470
R118
33k
+
C110
220
+ C111
.47
R115
100k
9V BATTERY
+
-
+ C109
100
C108
.01
D103
IN4007
+12V
SW 103B
LP-
METER LAMP
LP+
R109
150k
R108
500k
21
R110
N/L
21
R111
68k
R112
470
C104
.001
U101
LM324
+
3
-
2
OUT
6
D102
IN34A
+12V
SW 102B