Do you have the deep interest about how the bat detect obstacle and catch its preys in the dark? If you’ve been wondering all the time, then today you’ll reveal the secret by your own!

Basically, this simple bat detector is a device that based on a frequency division type. This mean is a device that allows you to hear any ultrasonic sound, but its need to be digitally scaling the frequency down into the human hearing range first (Note: the human hearing range is between 20 Hz to 20 kHz.).

The bat emits ultrasonic range from 9 kHz up to 200 kHz! Therefore, to enable us to hear the frequency, you should create a bat detector device that can analyze up to 20 kHz. Since all the division is to be done digitally, then all the amplitude information will be lost here.

The biggest advantage of this frequency division detector, is acting as a wide band device. Thanks to its specialty, you can hear all detectable bat sounds easily without need to tune the detector to specific frequency!

Since different type of bats has different ultrasonic range, you should be concentrated for one type only. For instance, you won’t hear the big brown bats ultrasonic sound, if you tune up the frequency up to 60 kHz! [Source]

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