Indicator and alarm for burglar alarms and the like

Details Indicator and alarm for burglar alarms and the like Indicator and alarm for burglar alarms and the like

1979-08-15

1981-03-17

Waring, Alvin H.

Communications: electrical

Condition responsive indicating system

With particular coupling link

340524, G08B 2500

Patent

active

042570379

ABSTRACT:
A detector and indicator for burglar alarms is provided wherein passive resonators, each tuned to a different frequency, are employed across each of the normally closed series switches of the burglar alarm. An alternating current generator is connected to the series line and tuned progressively to the frequency of each of the passive resonators. If an open circuit occurs across any of the resonators, a detector circuit detects the high impedance which results and actuates an indicator circuit wherein the indicator is selected for the frequency of the resonator of a particular location. Even if a plurality of switches are open, the selection circuit will be activated for the particular locations of the open switches.

REFERENCES:
patent: 3550090 (1970-12-01), Baker, Jr. et al.
patent: 3739376 (1973-06-01), Keledy

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