Protection circuitry for subscriber's telephone circuit...

Details Protection circuitry for subscriber's telephone circuit... Protection circuitry for subscriber's telephone circuit...

H - Electricity

04

M

379/27

H04M 1/27 (2006.01) H04M 1/2745 (2006.01)

Patent

CA 1229186

PROTECTION CIRCUITRY FOR SUBSCRIBER'S TELEPHONE CIRCUIT EQUIPPED WITH REPERTORY MEMORY ABSTRACT OF THE INVENTION A protective circuit for use in a subscriber's telephone circuit that includes a repertory memory and includes a battery which provides memory retention cur- rent. Circuitry permits the battery to be protected by a series current limiting resistor while maintaining sufficient voltage so that the memory maintains its integrity.

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