PROTECTION CIRCUITRY FOR SUBSCRIBER'S TELEPHONE CIRCUIT EQUIPPED WITH REPERTORY MEMORY

摘要

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