A Reliable Ultrasonic Remote Control Switch Circuit

Published:2011/4/27 18:37:00 Author:Christina | Keyword: Reliable, Ultrasonic Remote Control | From:SeekIC

Transmitter circuit: u1 and external components form the multivibrator, after press the sw1, the output signal of u1(3) pin drive the ultrasonic transducer chip y1 by q1,q2 to sent out the ultrasonic signal. Receiving circuit: in the standby mode, the electronic-level of u1(3) pin is higher than (2) pin, (6) pin sends out high electronic-level, trigger u2 holds the low output electronic-level, q3 cuts off, relay does not operate, so the lamp does not light; When the y1 received ultrasonic signal, after frequency selected amplification and rectification filtering, the signal get into the u1(2) pin, (6) pin becomes low electronic-level, trigger sends out high electronic-level, q3 connects and relay picks, the lamp is light as shown:



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