• on Audio/Video/Photography
  • Published in issue 9/2008 on page 72
About the article

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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