Ultrasonic Bat Detector Circuit

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Ultrasonic bat detector circuit.

These sounds lie in a frequency range above the human audible range and thus can t be heard directly. As you probably know bats emit ultrasonic sounds for the purpose of echolocation. This project is about building a so called bat detector i e. It has been suggested that bats utilize delay times arrival time differences and the doppler effect to interpret echoes.

Runs off a 12 v battery or any power supply from 6 to 16 v. 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 sound from the detector is heard at the same time the call is emitted by the bat.

Software is optimised for power saving and speed by using asynchronous classification. Firstly such transducers are very responsive to ultrasound and thus produce large output voltages upon detection as compared to a generic audio microphone. The detecting device used here is an ordinary electret condenser mic. 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. Heterodyning and frequency division are real time methods i e.