Build your own bat detector
On the pages of this site you will find details of bat detectors you can build yourself.
How they work
Bat detectors work by picking up the sounds with a special microphone. The detector takes the signals from the microphone, amplifies them, and produces an output in a form we can sense. Most bat detectors do this by transforming the sound made by the bat into a sound we can hear. But remember - the sound you hear is a REPRESENTATION of the bat call - it can never be the same because the conversion process changes the call. What we are seeking is a representation that mimics the pitch and loudness changes in the original call.
Before you start on your new bat detector you should read the pages about ultrasound, and the different techniques used to make it audible.
Simple Digital FD bat detector (SDFD)
This was designed by J Errington MSc. as a construction and development project for an HND Electronic Engineering class.
Details of design and operation of each stage are provided.
The design is suitable for anyone with a little experience in building electronic circuits.
Follow the SDFD pages in the menu above.
FD detector with Amplitude Restoration (FDAR)
This was originally developed as a concept by J. Errington MSc. and S. Frenehard.
It has been developed and brought to fruition as a working prototype by K. Horton (all rights reserved).
This project is a little more complicated as it requires production of a printed circuit board; after that the build is straightforward. Full details of construction are provided.
Follow the FDAR pages in the menu above.