Gain control circuit

Details Gain control circuit Gain control circuit

1976-06-10

1978-05-09

Dahl, Lawrence J.

Amplifiers

With semiconductor amplifying device

Including gain control means

330 85, 330 86, 330252, 330279, H03G 330

Patent

active

040889637

ABSTRACT:
A gain control circuit includes an audio signal attenuator circuit and a circuit for controlling the current in the audio signal attenuator circuit. The audio signal attenuator circuit is inserted between an input terminal of an amplifier circuit for amplifying an audio signal and an output terminal of a diode for detecting and rectifying part of the audio signal appearing at the output terminal of the amplifier circuit. The signal attenuator circuit and the current control circuit comprise a plurality of transistors and operate when, in response to application of an audio signal to the amplifier circuit, a DC voltage of certain level is produced at the output terminal of the rectifying diode. Part of the audio signal applied to the amplifier circuit is bypassed and attenuated, while at the same time stabilizing the DC bias in the amplifier circuit.

REFERENCES:
patent: 3582681 (1971-06-01), Norman et al.
patent: 3721914 (1973-03-01), Nakamura

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