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Last Updated on:  06/19/2009 02:21:39 PM

Simple Security Wire Loop Alarm Circuit
designed by David Johnson, P.E.
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. 

Circuit Circuit Circuits Simple Security Wire Loop Alarm Circuit
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