Line powered universal telephone amplifier

Details Line powered universal telephone amplifier Line powered universal telephone amplifier

1989-04-10

1990-04-17

Ng, Jin F.

Telephonic communications

Substation or terminal circuitry

Amplifying

379387, 381111, H04M 160

Patent

active

049187260

ABSTRACT:
An amplification device which enables an electret handset microphone, a dynamic handset microphone, or a carbon handset microphone to be connected to either an electronic telephone or to a hybrid coil telephone. The amplification device is powered from current from the line connecting the telephone to a KSU, PBX, or other telephone servicing system.

REFERENCES:
patent: 2891110 (1959-06-01), Miller
patent: 3046353 (1962-07-01), Tschumi
patent: 3180937 (1965-04-01), Moser
patent: 3700831 (1972-10-01), Aagaard et al.
patent: 4757545 (1988-07-01), Rosander

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