Light beam switch (CB21413E)

This circuit was obtained from a 1965 General Electric SCR manual. The components are from the period.

556 Multi-Hour Timer (CB19101E)
The 556 consists of a double integrated circuit 555, which can be replaced by them in this...
Capacitive relay (CB23765E)
We found this circuit in a Radio Electronics from January 1967. The SCR is already the C106, which...
Programmable Gain Amplifier (CB13915E)
This circuit is from American documentation from 1970. It can be designed with a BC558 and for the...