Amplifier circuit with automatic gain control and hearing aid eq

Details Amplifier circuit with automatic gain control and hearing aid eq Amplifier circuit with automatic gain control and hearing aid eq

1983-02-28

1985-04-02

Mullins, James B.

Amplifiers

With semiconductor amplifying device

Including gain control means

330145, 381121, H03G 320

Patent

active

045090220

ABSTRACT:
An amplifier system comprising an input transducer, an amplifier and an output transducer connected in cascade, and an automatic gain control circuit comprising a variable resistor for taking off a voltage which varies with the signal from the input transducer and supplies said voltage to a rectifier and an RC filter. The filter output is connected to the base of a first transistor having a collector that directly drives the base of a second transistor which is connected to the input of the amplifier in such a way that it bypasses the input signal of said amplifier to a greater extent as the signal across the variable resistor increases.

REFERENCES:
patent: 3248642 (1966-04-01), Rothschild
patent: 3725800 (1973-04-01), Papay
patent: 4079335 (1978-03-01), Doerig

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