Latching relay hold release circuit for a telephone instrument

Details Latching relay hold release circuit for a telephone instrument Latching relay hold release 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 1203331

LATCHING RELAY HOLD RELEASE CIRCUIT FOR A TELEPHONE INSTRUMENT ABSTRACT OF THE DISCLOSURE In a hold circuit including a relay normally latched and connecting the hold circuit to a subscriber telephone line, a first hold release circuit outputs a trigger signal to a silicon controlled rectifier turning on the rectifier responsive to a sensed drop in line potential, thereby providing an electrical path for the discharge of a capacitor. The capacitor discharges through the coil of the relay unlatching the relay and releasing the hold circuit from the line. The hold circuit is also arranged to be re- leased by a second hold release circuit which outputs a trigger signal to the silicon controlled rectifier responsive to a pre-arranged timing interval.

437971

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