This circuit is from a 1967 General Electric SCR manual. The capacitors are polyester and the inductor must have current according to the controlled load.
This circuit uses a photodiode or a phototransistor as a sensor. When pointed at a light source it...
Using a small speaker as a microphone, this 10-LED circuit was found in the March 1992 issue of...
This circuit consists of a bass filter that can be used as a subwoofer in a sound system. The...