Anti Lost Alarm (2)

Published:2011/6/29 6:21:00 Author:Sue | Keyword: Anti Lost, Alarm | From:SeekIC

When S1 is connected, IC1 begins to work. Its pin 2 will output oscillate signals which will be emitted by L1. When W receives the signals, IC2's pin 2 will output low level after the signals are transformed and amplified. IC2's pin 2 will output low level. IC3 doesn't work and BL makes no sound. When to use the device and when the distance is beyond 5m, W will receive no signals. IC2's pin 2 will output high level. IC3 begins to work. The signals will promote BL to make an alarm sound after the signals are amplified by V2.



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