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 power source was found in an old Argentine publication from 1973. The transistor could be the...
With this circuit it is possible to monitor a signal that is being recorded on an old tape...
This circuit is from a 70s documentation. The maximum sampling rate is 800 Hz. The operational...