The circuit shown, with the printed circuit board, was found in an article in the June 1990 issue of Radio Electronics magazine. Integrated circuits must be equipped with heat sinks.
This interesting low current circuit uses only one diode to obtain a full wave rectified signal....
This resistive sensor was found in a 1969 US documentation. The circuit uses transistors of the...
This circuit uses a sensitive reed relay to control external loads. The time delay is given by the...