文件名称:Ultrasonic-Proximity-Detector-Dec06_01
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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.
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
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