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Module circuit diagrams
52 mA bias
430
mike bias
J1
100
2
carbon
5.6u
mike
input
1Vpp in for
300Vpp out
320Vpp clip
9
1
6
7
15k
guard
1
main
33k
2
VOL
J1
3
10k
15k
6
2u2
Q1 .
2N338
1uH
47u
10k
main
in
1
6
8
2
Q1 .
2N1486
36
6k8
1
1k
56u
820
mike
out
5
9
+26 V
10k
10k
220
22uF
22uF
2k7
Q2 .
2N1481
10
15uF
1k
50mH
56nF
+8V
2k2
3k3
out
5
9
guard
+26 V
in
+24.5V on Xmit
3
2k7
T1
3
4
2x 180
10nF
5
Q1,Q3
47
2N1486
47
330
Class B
PRC 41 MODULATOR
18 jan 2018 kb
3.5mA
+19V
T1
2
3
106
5k6
4
1
2x 1k2
5
+4V
47u
1k
470
PRC 41 AUDIO
21 nov 2017 kb
+26.5V on Xmit
8.2
2x 5
4
1
160
Z=3k
5
3
10nF
T2
150k
15k
J2
820
10Vac
35mA
100
4k7
T2
2x 18
+1V
Q3,Q4 .
330
2N656
4
+180V
To RF
5
PWR
AMPL
7
side
tone
+24.5V
9
J2
5
18
4
50 mW into a
300- load
is 11Vpp min
20Vpp into 300
measured
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