A simple frequency division bat detector

This site describes the design of a simple frequency division bat detector using CMOS IC's.  It also provides results of measurements in support of this design made by the 2000 year group of HND1 Electrical and Electronic Engineering at the University of Northumbria.

The brief was to design a bat detector that would

detect bats without tuning
be suitable for novices to build and use
have a low component count and
use readily available components to create a design
backed up by our own measurements.

Here is a scanned image of our prototype.

	The detector is only 104mm * 62 mm Click on the picture for a larger image