Telephone earphone amplifier

Details Telephone earphone amplifier Telephone earphone amplifier

1978-05-23

1979-07-03

Claffy, Kathleen H.

179 81B, H04M 160

Patent

active

041601220

ABSTRACT:
This telephone earphone amplifier is turned on automatically when the telephone handset is taken off-hook. To this end, the dc bias provided to the microphone from the telephone line is used to turn on a semiconductor switch that connects dc power to the amplifier. The amplifier itself is connected to amplify the incoming audio, so as to provide greater volume e.g., to aid persons of impaired hearing.

REFERENCES:
patent: 2912502 (1959-11-01), Talcott
patent: 3041411 (1962-06-01), Beatty
patent: 3446976 (1969-05-01), Shaw

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