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 |

Noise limiter for receivers (CB8065E)
We found this circuit in a 73, magazine for radio amateurs of the 90s. The circuit is passive and...
Fire alarm (CB7240E)
This 1968 Mullard circuit detects fire by smoke using LDR-type sensors. The circuit makes use of...
Pulse Width Discriminator (CB5159E)
This circuit was found in an American 1980s documentation. Equivalent operational amplifiers can be...