Shunt regulator for hands-free telephone

Details Shunt regulator for hands-free telephone Shunt regulator for hands-free telephone

1985-06-18

1987-02-17

Rubinson, Gene Z.

Telephonic communications

Substation or terminal circuitry

For loudspeaking terminal

379387, H04M 160

Patent

active

046445790

ABSTRACT:
In a loudspeaking telephone the power supply to the loudspeaker amplifier is shunted by a regulator which functions as a programmable Zener diode. Under conditions of low available line current, e.g. where two similar instruments are operated in parallel at the end of a long line, the regulator voltage is reduced in value to disable the amplifier and conserve power to maintain the basic operating functions of the telephone.

REFERENCES:
patent: 4127743 (1978-11-01), Ozawa et al.
patent: 4495383 (1985-01-01), Lubin et al.
patent: 4608462 (1986-08-01), Blomely et al.

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