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Capacitance operated alarm to foil purse snatchers

2016-02-18 02:14  
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As long as touch plates (1) are touched together, the alarm is off. If not held for about 30 seconds, the alarm goes off. The circuit can be disabled with switch or by touching the plates (2)
Capacitance operated alarm to foil purse snatchers

The alarm is battery operated by a bicycle horn.



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