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.
We found this circuit of a transistor siren in a recent English publication. All components are still...
Other series amplifiers such as the MC3301, MC3401 and LM2900 can be used on this circuit. We found...
We find this efficient emergency lighting system in a 1987 publication. The circuit keeps a...