Ultrasonic Bat Detector Circuit

It has been suggested that bats utilize delay times arrival time differences and the doppler effect to interpret echoes.

Ultrasonic bat detector circuit.

That s where the bat detector comes in. 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. Detection of the high frequency clicks bats emit must be done with an ultrasonic transducer for two reasons. As you probably know bats emit ultrasonic sounds for the purpose of echolocation.

These sounds lie in a frequency range above the human audible range and thus can t be heard directly. The sound from the detector is heard at the same time the call is emitted by the bat. This project is about building a so called bat detector i e. Results can be displayed in real time with 30 second delay in either text or spectogram or bar chart format.

Software is optimised for power saving and speed by using asynchronous classification. A device that lets you listen to and record the sounds emitted by bats. Heterodyning and frequency division are real time methods i e. The mic input is fed to the inverting input of the ic pin 2.

The figure above shows a simple ic 741 based ultrasonic sound sensor alarm circuit. Full spectrum ultrasonic audio recording in mono at 384 ks per second. The detecting device used here is an ordinary electret condenser mic.