This circuit was found in a 80's Popular Electronics. The sensor can be any phototransistor. The circuit is indicated for an audio link modulated in pulses.
This circuit was obtained in an old American documentation, remembering that the 566 is the double...
The purpose of this circuit found in a 1990 documentation is to control two incandescent lamps or...
This oscillator that excites 3 LEDs sequentially is also called a circle oscillator. The frequency...