Continuing this thread about heterodyne detectors designed as toys:
http://www.birdforum.net/showthread.php?t=286374&highlight=Discovery+ultrasonic
I bought what appears to be the same thing on eBay as a "Discovery Kids Ultrasonic Detector" for about $30 Australian. I haven't used it much, but it seems to work.
I'm wondering if anyone has tried to make modifications to it, eg add a socket to attach a recorder?
I'm also wondering if I should try to calibrate it. If so, any ideas how to do it?
http://www.birdforum.net/showthread.php?t=286374&highlight=Discovery+ultrasonic
I bought what appears to be the same thing on eBay as a "Discovery Kids Ultrasonic Detector" for about $30 Australian. I haven't used it much, but it seems to work.
I'm wondering if anyone has tried to make modifications to it, eg add a socket to attach a recorder?
I'm also wondering if I should try to calibrate it. If so, any ideas how to do it?