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 circuit was found in a 1968 General Electric documentation. It has an input impedance of 2 M ohms...
This circuit shuts off and locks the power to a load in the event of a failure. The circuit is from...
This circuit is from 1995 documentation, but can be easily assembled today, as the components used are...