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Last Updated on: Monday, August 18, 2014 04:34 AM

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More  Alarm Circuits   Security Circuits

Wire Security Loop Alarm


A wire loop is used to protect valuable objects in this simple alarm circuit.  The electronic hobby circuit is powered by a 9v battery.  The alarm beeper is activated if the wire loop is severed.  The standby current is so low that the 9v battery should last for many years. 

Click on Drawing Below to view PDF version of Schematic

Circuit Security Loop Alarm Circuit designed by David Johnson, P.E. (June 30, 2006)

More  Alarm Circuits     Security Circuits

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