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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Atmospheric noise monitor (CB21066E)
This circuit uses an MW radio tuned to around 540 kHz to detect atmospheric signals, for example, from...
Crystal Oscillator (CB3894E)
This circuit has been found in an old American documentation and is intended for calibration of radio...
Crystal Oscillator LM339 (CB17388E)
This configuration appears several times on this site. The circuit can generate a 100 kHz or other...