Ultrasonic remote light switch circuit diagram

Published:2011/8/9 18:03:00 Author:Vicky | Keyword: ultrasonic, remote light switch | From:SeekIC

Picture 1 is a emitter circuit. The circuit uses discrete devices. VT1, VT1, R1, R2, R3, R4 , C1 and C2 constitute a self-excitation multivibrator. Ultrasonic emitting device B is connected in the collector loop of VT1 and VT2 to conduct push-pull work. The time of loop is often determined by R1, C1, R4 and C2. The resonance frequency of ultrasonic receptor device B triggers the multivibrator circuit. Hence, the circuit can work under optimized frequency. Picture 2 is a receiving circuit, JFET VT1 constitutes high-input resistance amplifier, which performs better working with ultrasonic receptor device B and obtains higher receiving sensitiveness and better frequency-selecting performance.



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