Based on Radio Shack 276-137, this circuit was found in the December 1995 issue of Electronics Now magazine. The circuit drives an LED but could use a relay instead.
Small time intervals up o some minutes can be achieved with this circuit. Only incandescent lamps...
Light falling on the transistor changes both the mark and the space of the generated signal thanks to the...
The frequency of the square signal produced by this circuit depends on the light falling onto the...