Bistable light relay (CB21708E)

This circuit was found in an internet documentation. The relay must have voltage according to the supply.

Sensitive photocell (CB22533E)
This circuit is from a Radio Electronics from January 1958. The transistor is the CK722, and the...
Touch Sensor (CB18533E)
This circuit with transistors was found in an old Japanese publication, translation of an American...
45 MHz FI amplifier (CB8414E)
Found in documentation from the 90s, this circuit was used in communications receivers of the...