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Circuits designed by David Johnson, P.E.
Last Updated on: Thursday, March 04, 2010 04:17 AM

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 Alarm Circuits

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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)

Master Schematic Category List  -  David A. Johnson, P.E.
Alarm Circuits
 
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