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.
Equivalent operational amplifiers can be used on this crystal-controlled oscillator. The circuit is...
We found this circuit in an American documentation from the 90's. The circuit makes use of general...
This circuit was obtained in a 1982 publication. There are many types of car alarms available to...