Ultrasonic Bat Detector Circuit
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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.
Ultrasonic bat detector circuit. It has been suggested that bats utilize delay times arrival time differences and the doppler effect to interpret echoes. As you probably know bats emit ultrasonic sounds for the purpose of echolocation. Full spectrum ultrasonic audio recording in mono at 384 ks per second. The figure above shows a simple ic 741 based ultrasonic sound sensor alarm circuit.
These sounds lie in a frequency range above the human audible range and thus can t be heard directly. Detection of the high frequency clicks bats emit must be done with an ultrasonic transducer for two reasons. Firstly such transducers are very responsive to ultrasound and thus produce large output voltages upon detection as compared to a generic audio microphone. That s where the bat detector comes in.
The mic input is fed to the inverting input of the ic pin 2. This project is about building a so called bat detector i e. 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.
Runs off a 12 v battery or any power supply from 6 to 16 v. Software is optimised for power saving and speed by using asynchronous classification. The detecting device used here is an ordinary electret condenser mic.
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