Telephone handset amplifier circuit

Details Telephone handset amplifier circuit Telephone handset amplifier circuit

1983-09-20

1984-08-14

Pellinen, A. D.

Electrical audio signal processing systems and devices

Including amplitude or volume control

With manual volume control

179 81B, H04M 160

Patent

active

044661207

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, Jr.

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