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11/11/2011· just hang on doorknob gives alarm when someone touches doorknob. nothing to install. nothing to plug in. just hang on door knob. works on wood doors only. will not work on metal doors. you can
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this simple touch sensitive alarm is developed by using ne 555 timer ic, operated as a monostable vibrator. this touch alarm circuit will sound when somebody touches the trigger plate. touch the sensing plate of the alarm with your finger and it starts beeping and then stops.
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