Alarm system with supervisory system to detect severing or bridg

Details Alarm system with supervisory system to detect severing or bridg Alarm system with supervisory system to detect severing or bridg

1974-06-11

1976-12-14

Swann, III, Glen R.

Communications: electrical

Systems

Call station

307321, 340274R, 340276, 340409, G08B 1300

Patent

active

039978907

ABSTRACT:
A tamper proof detector circuit for use in an alarm system and an integral switch for use therein. The integral switch is comprised of a housing which encloses an alarm condition sensing switching means connected to a diode. The integral switches are connected in a bridge and an AC voltage is applied thereto. A DC voltage drop detecting means is connected to the output of the bridge for detecting a drop in voltage which will occur if an intruder either open circuits or short circuits one of the integral switches. An overvoltage detecting means is provided for detecting a voltage source which an intruder might insert in the circuit to conceal the removal of an integral switch.

REFERENCES:
patent: 2624792 (1953-01-01), Fruh
patent: 3440636 (1969-04-01), Sliman
patent: 3603949 (1971-09-01), Walthard
patent: 3624646 (1971-11-01), Weiss
patent: 3673589 (1972-06-01), Barret et al.
patent: 3821733 (1974-06-01), Reiss et al.
patent: 3924256 (1975-12-01), Cohen

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