Oscillator HA7210 (CB22402E)

This circuit is from an old documentation and can be used to generate signals in different frequency bands.

Delayed light (CB10091E)
This circuit for incandescent lamps was found in a 70s documentation. The circuit uses an SCR...
Ultra-simple FM or shortwave radio (CB23973E)
This circuit is from an Elementary Electronics from 1977. It can be assembled with relative ease...
Transmitter Detector (CB26100E)
This circuit detects the presence of strong signals from spy transmitters, enabling their...