This circuit for incandescent lamps was found in the January 1980 Radio Elecronics magazine. The sensitivity can be controlled by a potentiometer and the microphone used is of the dynamic type.
This circuit was found in a Radio Electronics issue from May 1989. Please note that it may not...
This circuit causes a bicolor LED or two LEDs of different colors to alternately flash at a...
This circuit is suggested by RCA and is based on a dedicated integrated circuit that is the...