Domestic Seismic Alarm (3)

Published:2011/6/27 2:55:00 Author:Sue | Keyword: Domestic, Seismic, Alarm | From:SeekIC

When the switch is on, the seismic alarm isin detection condition. When there is no earthquake, IC1's pin 3 outputs low level and VT is disconnected. The alarm circuit does not work. When there is an earthquake, the magnet will move vertically. When it is away from IC1, IC1's pin 3 outputs high level and VT is connected. HL is illuminated. IC2 and IC3 begin to work. When the sound signal output by IC2 is amplified by IC3, BL will make an alarm sound.



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