Astable 555 (CB21101E)

This 50% duty cycle configuration was found in a Popular Electronics from the 1990s. The operating frequency is given by C1.

Sensitive Photo Relay CB13492E (CB13492E)
This circuit is from the documentation of Radio Shack 1975. It can be mounted with 12 V relays,...
Single Pulse Triggering with Triac (CB24899E)
Using an optocoupler this circuit turns on the light in a bedroom for a set amount of time when...
Remote current reader (CB8985E)
This circuit is used for remote current monitoring. In the original version of the 80s a lamp is...