Push-pull audio amplifier system with muting

摘要

Audio signals are equally power divided with the power divided signals being 180 DEG out-of-phase. These separate out-of-phase signals are separately applied to the inverting input of separate current-differencing type operational amplifiers wherein the out-of-phase signals are separately amplified. The separate operational amplifiers are individually connected to a different one of two amplifiers connected in push-pull. Muting of this audio output is achieved by passing a large DC current to the inverting input of the separate operational amplifiers simultaneously whereby the output level therefrom drops to a level that biases the push-pull amplifiers off.