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 configuration based on a conventional astable multivibrator was found in a 1982 publication. The...
Operational amplifiers used in this 80's circuit is not very common today, but the setting can be...
This circuit was found in an Electronic Design from 1967. The circuit uses two triacs being T2...