1-minute delay (CB21408E)

This circuit with PUT is from a 1967 General Electric manual. The relay must have voltage according to the supply.

Photodiode Amplifier 3 (CB13094E)
Photodiodes can be used to sense moving objects, such as optical switches and encoders. In the...
Half Wave Quadruplicator (CB20197E)
In the figure we have the configuration of a half wave voltage quadruplicator. In this case,...
Video Switch (CB17054E)
This circuit, found in a 1995 documentation, is intended for switching composite RGB video signals...