Re: [PSUBS-MAILIST] Passive sonar research

[Jon Wallace <jonw@psubs.org>]

David,

Do an internet search for "bat detector" or "listening to bats" or use 
similar wording.  Somebody out there has a schematic for a home-built 
bat listening device.  I've seen it before but didn't keep a reference 
to it.  It detects the ultrasonic "pings" of bats looking for food at 
night.  This will save you from having to reverse engineer an existing 
device.  As I recall, the circuit is minimal and quite simple.

Jon

>    I was able to locate a kids toy that could detect and allow the 
> listening to bats. Perhaps if I took this simple device apart, I could 
> modify it to detect slightly higher frequencies I so desire.
>  
>    




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