This 80's circuit turns off a TV or other appliance after a set time. The base is a 555 IC and the relay is according the supply.
This untuned (aperiodic) amplifier circuit was found in the August 1974 Radio Electronics...
The figure shows how to implement an audio power output for an operational stage. With the...
This latching alarm using simple contact relay was found in an English documentation from 1980. The...