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Ultrasonic Proximity Detector

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Published on 2020-09-29
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This ultrasonic proximity detector consists of an independent battery-powered transmitter and receiver. It is controlled at approximately 40 kHz using a pair of matched ultrasonic piezoelectric ceramic transducers. This circuit can be used in exhibitions to open pre-recorded audio/video, and when visitors are interested in products, the product information will be automatically displayed.
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