This circuit is used for automating a day/night scheduled security system which, best of all, could only cost cost you $0.25 a YEAR to run. (All electricity prices based on a 2009 national average cost found here .) If you have a security system circuit you would like to run for a long time, th...By: MacDynamo
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Source: http://www.instructables.com/id/Security-System-Power-Saver/
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