Title:
Ultrasonic-Proximity-Detector-Dec06_01
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Description: 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.
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Ultrasonic Proximity Detector Dec06_01.pdf
