Found in Electronics Now this circuit is indicated for operation at the output of audio amplifiers. The circuit is powered by 12 V from the amplifier itself or from another source.
This circuit was found in the September 1976 issue of Radio Electronics magazine. The circuit is...
This wireless infrared remote sound transmitter is from an article published in the August 1988...
This shield circuit for lamps and other charges was found in a Popular Electronics from the 90's....