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 circuit was found in a Philips documentation from 1966. Its purpose is to drive the solenoid...
This 9 V amplifier has a gain of 20 and provides a power of a few hundred milliwatts. The circuit is...
Found in a 1964 Electronic Design, this circuit shows how to modulate a signal with a dynamic low...