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Circuits designed by David Johnson, P.E.
Last Updated on: Friday, November 17, 2017 06:32 AM

List of Dave's Circuit Designs

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More  Alarm Circuits   Security Circuits

Wire Security Loop Alarm


A wire loop is used to protect valuable objects in this alarm circuit.  The circuit is powered by a 9v battery.

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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