Automatic TV power off (CB5945E)

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.

| Clique na imagem para ampliar |

Absorption Wattmeter (CB22023E)
Found in old English documentation this circuit evaluates the power of a transmitter. The circuit has...
Optoelectronic detector (CB12986E)
In this circuit the signal from the phototransistor is amplified by a Darlington stage and then...
Automatic Secrecy Monitor For Phone (CB6881E)
The circuit shown, found in a 2004 documentation, allows the use of a telephone, without the...