ULTRASONIC PROXIMITY DETECTOR...We the humans can hear sound of up to 20kHz frequency only. This proximity detector works at a frequency of 40 kHz. It uses two specially made ultrasonic transducers: One transducer emits 40kHz sound, while the other receives 40kHz sound and converts it into electrical variation of the same frequency.

Ultrasonic Proximity Detector Dec06_01.pdf

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