Apparatus for picking up signal currents flowing through signal

Details Apparatus for picking up signal currents flowing through signal Apparatus for picking up signal currents flowing through signal

1974-05-22

1976-07-13

Caldwell, John W.

Communications: electrical

Systems

Call station

317 18D, 317 27R, 317 33SC, G08B 2100

Patent

active

039697100

ABSTRACT:
In apparatus for picking up a pulse shaped signal current flowing through a signal line for operating a remotely located relay, a pickup coil is wound on a magnetic core linking the signal line and the voltage induced in the pickup coil is applied to a high resistance or a programmable unijunction transistor having a high input impedance. The output of the unijunction transistor is applied to the gate electrode of a thyristor while at the same time the discharge current of a capacitor is passed through the gate electrode of the thyristor via the unijunction transistor thereby assuring positive triggering of the thyristor. The capacitor is also used to prevent misoperation of the programmable unijunction transistor caused by the variation in the source voltage while the transistor is maintained OFF.

REFERENCES:
patent: 3539868 (1970-11-01), Stevenson
patent: 3579280 (1971-05-01), Florance
patent: 3590324 (1971-06-01), Rockefeller
patent: 3611038 (1971-10-01), Benham
patent: 3668472 (1972-06-01), Shields et al.
patent: 3737726 (1973-05-01), Tarchalski
patent: 3800189 (1974-03-01), Montz
patent: 3806764 (1974-04-01), Hobson et al.
patent: 3810003 (1974-05-01), Portoulas
patent: 3813579 (1974-05-01), Doyle et al.
patent: 3859567 (1975-01-01), Allard

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