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Door Knob Touch Alarm by Dave Johnson

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If you want to construct yourself a Door Knob Touch Alarm , you may see this circuit diagram drawn by Dave Johnson (click to enlarge the circuit)

DOORKNOB TOUCH ALARM CIRCUIT DIAGRAM

Note: this Door Knob Touch Alarm application will not work on metal doors (source: discovercircuits.com)



Filed in category: Circuitry, Touch Alarm, Door Alarm Circuit, by Doughary Dow at September 2, 2009
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