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

1982-11-01

1984-06-12

Pellinen, A. D.

179 99H, H04M 100

Patent

active

044543859

ABSTRACT:
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 released by a second hold release circuit which outputs a trigger signal to the silicon controlled rectifier responsive to a pre-arranged timing interval.

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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