Found in the September 1972 issue of Radio Electronics magazine, this signal injector is based on the HEP580. The circuit is powered by two batteries and its frequency is basically given by C1.
This approach alarm was found in Radio Electronics from July 1990. The circuit must be powered by a...
This simple motor control for alternating current with triac was obtained in a European...
This circuit is designed to be used with the infrared transmitter two circuits before this one....