Telephone handset amplifier circuit

Details Telephone handset amplifier circuit Telephone handset amplifier circuit

1989-03-27

1990-08-21

Dwyer, James L.

Telephonic communications

Substation or terminal circuitry

Amplifying

381109, H04M 160

Patent

active

RE0333093

ABSTRACT:
A rocker switch is operated by the handset user to vary the impedance of a FET. The FET impedance varies in proportion to the duration of operation of the switch. The handset receiver "volume" increases or decreases in proportion to the FET impedance. An electret condensor microphone stabilizes the receiver supply voltage and provides improved transmitter linearity and low distortion.

REFERENCES:
patent: 3533006 (1970-10-01), Kubicz
patent: 3691298 (1972-09-01), Pittman et al.
patent: 3963876 (1976-06-01), Holtz et al.
patent: 4151376 (1979-04-01), Walker

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