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.

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Proximity sensor (CB8194E)
Published in a PE Hobbyst Handbook of 1991, this sensor uses an integrated circuit that is unusual...
AM Modulator (CB20772E)
This circuit was obtained in a Motorola manual from the 70s. The integrated circuit is from that...
Isolation Circuit for RS-232 (CB12773E)
In critical applications of the RS-232 interface, the danger of induced voltages in the cables must...