Ultrasonic Bat Detector Circuit

The mic input is fed to the inverting input of the ic pin 2. Firstly such transducers are very responsive to ultrasound and thus produce large output voltages upon detection as compared to a generic audio microphone. This project is about building a so called bat detector i e.

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The figure above shows a simple ic 741 based ultrasonic sound sensor alarm circuit.

Ultrasonic bat detector circuit.

By down converting the ultrasound into our audible range we can indirectly detect it and at least enjoy a window into the hidden world of echolocation. Full spectrum ultrasonic audio recording in mono at 384 ks per second. The sound from the detector is heard at the same time the call is emitted by the bat. Heterodyning and frequency division are real time methods i e.

As you probably know bats emit ultrasonic sounds for the purpose of echolocation. Software is optimised for power saving and speed by using asynchronous classification. Detection of the high frequency clicks bats emit must be done with an ultrasonic transducer for two reasons. A device that lets you listen to and record the sounds emitted by bats.

Heterodyning is the most sensitive method of the two but only transforms a small portion of the ultrasonic frequency range. Runs off a 12 v battery or any power supply from 6 to 16 v. That s where the bat detector comes in. The detecting device used here is an ordinary electret condenser mic.

Results can be displayed in real time with 30 second delay in either text or spectogram or bar chart format. It has been suggested that bats utilize delay times arrival time differences and the doppler effect to interpret echoes. These sounds lie in a frequency range above the human audible range and thus can t be heard directly.

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