This circuit appeared in the June 1990 issue of Radio Electronics magazine. Integrated circuits must be equipped with heatsinks. Current and voltage depend on the ICs used.
This simple circuit, which requires a low current (50mA) relay for 5 to 12V power supplies, was...
This simple circuit is powered by the logic circuit itself. Components are still common, although...
This old configuration using a germanium transistor was designed to operate with variable...