Ultrasonic remote control light switch circuit

Published:2011/4/24 22:21:00 Author:Nicole | Keyword: ultrasonic, remote control light, switch | From:SeekIC

Ultrasonic is invisible, it will not interfere the household appliances, so it is popular among some occasions. The figure is as shown, it is a practical ultrasonic remote control light switch, it consists of ultrasonic remote control transmitter and receiver. The ultrasonic remote control transmitter circuit is shown as figure (a), the 40kHz free running multivibrator is composed of NE555 time base circuit A1, outputed from ③ foot, the electrical signal radiates ultrasound remote control command by VT1, VT2 amplifying and driving ultrasonic transducer B1. RP1 is trimmer resistor, it can adjust oscillation frequency to ensure it work with 40kHz. The ultrasonic remote control receiver circuit is shown as figure (b). It is composed of ultrasonic reception transducer B2, preamplifier VT3, sound control special IC A2, electronic switch and power supply.



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