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