Ton Giesberts
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Ultrasonic Sound Detector

track down high frequencies

Ultrasonic Sound Detector
Using the circuit described here you can quickly and simply check whether harmful sounds with a high frequency are being produced somewhere nearby, especially important at locations where the so-called ultrasonic teen-deterrents against loitering youths are installed. Ten LEDs indicate the sound pressure of signals with frequencies between 16 and 40 kHz.
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