Latching relay hold circuit for a telephone instrument

Details Latching relay hold circuit for a telephone instrument Latching relay hold circuit for a telephone instrument

H - Electricity

04

M

379/33, 379/73

H04M 1/00 (2006.01) H04M 1/80 (2006.01) H04M 3/428 (2006.01)

Patent

CA 1203332

LATCHING RELAY HOLD CIRCUIT FOR A TELEPHONE INSTRUMENT ABSTRACT OF THE DISCLOSURE In a hold circuit connectable to a subscriber telephone line, a line voltage storage capacitor is momentarily connected to the subscriber line charging to line potential and providing trigger current to a silicon controlled rectifier. When sufficient trigger current is gained the silicon controlled rectifier turns on discharging the capacitor through a latching relay coil and a transistor, thereby turning on the relay and connecting the hold circuit. The transistor is turned on by a bias voltage from the capacitor when the silicon controlled rectifier is turned on.

437972

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