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 is the basic configuration of an operational amplifier as a current regulator. We found it in...
Indicated to power a decoder system circuit, this power supply used a regulator circuit of the...
Found in a 90s Radio Electronics, this circuit can be used in high voltage experiments, ionizers,...