Push-pull audio amplifier system with muting

Details Push-pull audio amplifier system with muting Push-pull audio amplifier system with muting

1976-11-12

1977-08-09

Mullins, James B.

Amplifiers

Modulator-demodulator-type amplifier

179 1P, 330 22, 330 28, 330 30R, 330 84, 330149, H03F 326

Patent

active

040414086

ABSTRACT:
Audio signals are equally power divided with the power divided signals being 180.degree. 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.

REFERENCES:
patent: 3889202 (1975-06-01), Suzuki

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