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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LM390 Intercom (CB25310E)
This two-channel wired intercom was found in the April 1990 issue of Radio Electronics magazine....
Magnetic proximity sensor (CB7920E)
This sensor triggers an oscillator emitting sound when a magnet is approached by a reed switch....
1.3 V Regulator (CB25901E)
This circuit is based on the voltage drop of the diodes in conduction, in the order of 1.6 to 1.7...