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Last Updated on: Tuesday, June 01, 2021 03:06 PM

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More  Alarm Circuits   Security Circuits

Wire Security Loop Alarm (June 30, 2006)


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 Circuit Below to view PDF of Schematic


Security Loop Alarm Circuit designed

 by David Johnson, P.E. (June 30, 2006)

More  Alarm Circuits     Security Circuits

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