Homemade Alarm Made From Two Audio Jacks
A homemade alarm system made from two “normally closed” audio jacks is the focus of our most recent Weekend Project, the Alarm Bag. The alarm system, built into an enclosure (above), can be installed into any bag (in our project, a messenger bag is used) or even modified to act as a door or window alarm. The 2-jack design means the alarm will activate whenever the second audio jack (the trigger) is removed.
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