Body induction alarm circuit

Published:2011/5/12 22:31:00 Author:Nicole | Keyword: body induction, alram | From:SeekIC

This alarm circuit uses the body distributed capacitance to make a alarm device. When there is nobody closing, BG1, L1, C1 form a multivibrator, relay J is not working; when people are closing the inductor about 1cm, because of the body capacitance, the oscillation circuit will stop vibrating, J starts to work, then the indicator light or warning bellwill alarm.



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