Half wave control (CB21375E)

This circuit for heating elements was taken from a 1966 General Electric manual. The SCRs are load-according, and the sensor is 1 ohm.

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Rectangular oscillator CA3140 (CB9219E)
Found in Radio Electronics from the 90s, this circuit has frequency and active cycle adjustment....
Remote control receiver (CB22360E)
This circuit is the receiver for the previous remote-control transmitter. We found it in the same...
Continuity test (CB8214E)
Found in 90s Popular Electronics, this circuit uses common general-purpose transistors in a...