Suggested by General Electric documentation from 1968, this circuit activates a relay after 60 seconds, keeping it closed. PUT is an uncommon component today.
This source of two voltages and two currents was found in documentation translated from Argentina. We...
This circuit makes use of a pickup system that in modern times can be an optical fiber. The...
In this circuit, a jack with a diode activates a relay in a security system. The circuit is from a...