Analog volume control circuit

Details Analog volume control circuit Analog volume control circuit

1989-01-19

1989-12-19

Isen, Forester W.

Electrical audio signal processing systems and devices

Including amplitude or volume control

With manual volume control

307554, 307568, 330 86, 330282, H03G 300

Patent

active

048888109

ABSTRACT:
A volume control circuit for hearing aids is adjustable to vary a control signal supplied to an amplifier between a microphone and receiver of a hearing air. The volume control circuit includes a positive voltage source, a charge holding circuit, and a switch for alternatively connecting the holding circuit with the positive voltage source to increase its voltage, with ground to decrease voltage, and with an open circuit to maintain a constant voltage. The holding circuit voltage is inverted around a predetermined reference voltage level, with the inverted signal amplified and applied to the gate terminal of an n-channel field effect transistor having its source terminal biased to a predetermined source voltage level, and its drain terminal electrically connected to the amplifier to provide the control signal. In response to charging of the holding circuit, the gate voltage is reduced to increase the FET impedance, thus decreasing the gain of the amplifier.

REFERENCES:
patent: 3952211 (1976-04-01), Eberhard
patent: 3962651 (1976-06-01), Mc Call
patent: 4085340 (1978-04-01), Salesky et al.
patent: 4137466 (1979-01-01), Schemmel et al.
patent: 4466120 (1984-08-01), Walker, Jr. et al.
patent: 4528686 (1985-07-01), Dressler
patent: 4679240 (1987-07-01), Heide
Mollinga, "The FET as a Voltage-Controlled Resistor", EEE, Jan. 1970.

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