Amplifier for use with telephone transmitter mounted in hand hel

Details Amplifier for use with telephone transmitter mounted in hand hel Amplifier for use with telephone transmitter mounted in hand hel

1983-05-02

1985-01-01

Rubinson, Gene Z.

179103, H01M 160

Patent

active

044916892

ABSTRACT:
An amplifier for use with an electret microphone utilized as a telephone transmitter in a hand held telephone unit or handset. Incorporated into the circuitry is a band pass filter which substantially inhibits feedback "singing" which occurs because of reflection when the handset or telephone unit is placed in a downward position on a hard surface or similar environment. The filter circuitry employs the source resistance of the telephone transmitter and the input resistance of a transistor amplifier stage as elements of the included filter circuitry.

REFERENCES:
patent: 4414433 (1983-11-01), Horie et al.

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