Microphone circuit

Details Microphone circuit Microphone circuit

1997-04-22

2000-08-15

Chang, Vivian

Electrical audio signal processing systems and devices

Circuitry combined with specific type microphone or loudspeaker

With electrostatic microphone

H04R 300

Patent

active

061048186

ABSTRACT:
A microphone circuit with low distortion and having the capability of an electronic volume control. The circuit includes a capacitor microphone cap provided with a field effect transistor at the output end and a capacitor connected to the output end of the microphone cap. A resistance for supplying a driver voltage to the microphone circuit is connected to a connecting point between the microphone cap and the capacitor. Preferably a transistor adapted to generate a driver voltage for the microphone circuit or an electronic valve is connected between the microphone cap and the connecting point. The emitter of the transistor is then connected to the collector of the field effect transistor and the collector of the transistor is connected to the connecting point.

REFERENCES:
patent: 4414433 (1983-11-01), Horie et al.
patent: 4518829 (1985-05-01), Boeckmann

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