Ultrasonic Bat Detector Circuit
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The detecting device used here is an ordinary electret condenser mic.
Ultrasonic bat detector circuit. A device that lets you listen to and record the sounds emitted by bats. 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. Heterodyning and frequency division are real time methods i e.
That s where the bat detector comes in. Firstly such transducers are very responsive to ultrasound and thus produce large output voltages upon detection as compared to a generic audio microphone. As you probably know bats emit ultrasonic sounds for the purpose of echolocation. Results can be displayed in real time with 30 second delay in either text or spectogram or bar chart format.
Runs off a 12 v battery or any power supply from 6 to 16 v. Detection of the high frequency clicks bats emit must be done with an ultrasonic transducer for two reasons. Heterodyning is the most sensitive method of the two but only transforms a small portion of the ultrasonic frequency range. It has been suggested that bats utilize delay times arrival time differences and the doppler effect to interpret echoes.
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. The figure above shows a simple ic 741 based ultrasonic sound sensor alarm circuit.
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