Bat detector frequentie division with amplitude recovery.

This is a brand new DIY bat detector that I built some more information can be found on my TEENSYBAT website, you have to look for the simple heterodyne/FD for the manual.

Operation is simple, just place a 9v battery, turn on and change the volume according to your needs.

The aplitude recovery makes bats close to you sound louder than bats far away.

Two ultrasonic transducers are used to pick up the sounds of most of the common species.