ST ST7 - Page 274

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9 - A Carrier-current System for domestIc Remote Control
The following figures show the schematics of the receiver:
09-xrx-1
NPh
10nF-400V
180
Pb2 (9)
1M
22pF
47pF
47pF
22K
22K
20K
47pF
47pF
Pc1 (16)
100nF
400V
+
6.2V
Power supply
100K
100K
100K
100K
Va
220µF
Pa7
(18)
Pa6
(19)
Pa5
(20)
Pa4
(21)
ST72E25
Carrier-current system : diagram of the receiver circuit ;
part 1 : the input signals
33pF 33pF
10M
1MHz
Oscin (2)
Oscout (3)
Reset (1)
1µF
Vss (27)
Vdd (28)
10nF
Va
100pF
2N
2222
4.7K
150
10K
100K
1M
2N2222
Va