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

1982-11-01

1984-03-06

Pellinen, A. D.

179 99H, H04M 100

Patent

active

044356226

ABSTRACT:
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.

REFERENCES:
patent: 4001520 (1977-01-01), Waldman et al.
patent: 4011413 (1977-03-01), Phillips
patent: 4093829 (1978-06-01), Silberman
patent: 4258232 (1981-03-01), Smith et al.
patent: 4365117 (1982-12-01), Curtis
patent: 4387274 (1983-06-01), Stein et al.
patent: 4394543 (1983-07-01), Keiper, Jr. et al.
patent: 4394544 (1983-07-01), De Leon

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