Audio output amplifying device

Details Audio output amplifying device Audio output amplifying device

1984-12-19

1986-12-23

Mullins, James B.

Amplifiers

Combined with automatic amplifier disabling switch means

330 84, 330124R, 330146, 330295, H03F 368

Patent

active

046314903

ABSTRACT:
An audio output amplifying device which is adapted for use in a plurality of audio output amplifying circuits. An audio signal to be amplified is supplied to a positive phase input of a first differential amplifier. The positive phase input of a second differential amplifier is selectively coupled either to a source of a reference voltage (ground) or the source of the audio signal. A feedback circuit is connected between the output of the first differential amplifier and the negative phase inputs of both the first and second differential amplifiers. A switch is provided to selectively couple the output of the first differential amplifier to ground in one position and to allow amplification by both differential amplifiers in a second position.

REFERENCES:
patent: 3939435 (1976-02-01), Suzuki
patent: 4494077 (1985-01-01), Fukaya et al.

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