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door alarm
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  1. Urban Survival
    Downloads: A new file has been added by Herne: Another Door Alarm Another portable door alarm circuit. It hangs on the inside of the door knob and sets off an alarm if someone touched the outside of the knob.
  2. Urban Survival
    Downloads: A new file has been added by Herne: Portable Door Alarm A portable alarm that hangs on a door knob. It beeps an alarm if someone outside touches the door knob. Requires electronic knowledge, but is a simple ciruit.
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