Gain control circuits for audio amplifiers

Details Gain control circuits for audio amplifiers Gain control circuits for audio amplifiers

1976-04-08

1977-09-27

Dahl, Lawrence J.

Amplifiers

With semiconductor amplifying device

Including gain control means

330278, H03G 330

Patent

active

040514420

ABSTRACT:
A gain control circuit is connected between an output terminal of a transistor detector circuit for audio-frequency or voice signal and an audio amplifier circuit. The gain control circuit comprises a control transistor having an output electrode at which an output potential is produced which is lowered correspondingly as the potential at the output electrode of the detection transistor is decreased, and is utilized for controlling the gain of the audio amplifier circuit. The gain control circuit further comprises time constant circuit, for controlling the control time and the restoring time of the potentials at the output electrodes of the above two transistors and a switching circuit.

REFERENCES:
patent: 2556070 (1951-06-01), DeGroot et al.
patent: 3230458 (1966-01-01), Stangeland
patent: 3790896 (1974-02-01), Shimizu et al.
patent: 3848194 (1974-11-01), Nishimura et al.

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