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Hi, Anand
15 Years ago, I built a similar device using a Motorola Piezo Tweeter able to pass 40 kHz ( the rectangular shape one ) 100 W ...
but cheap !!!
http://www.adelcom.net/MOTOROLA_ksn1016a.htm
Do not laugh . you need some power for the device to be really effective ( say using a 12v bridged amplifier i.e.)
Some frequency shift between 25 and 40 Khz ( randomly is best ...) will be the must ...
But remember gentle Bats will leave the vicinity ...
Alain
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Why insist on using 32 Bits when you're not even able to deal with the first 8 ones ??? ehhhhhh ...
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IF there is the word "Problem" in your question ...
certainly the answer is " RTFM " or " RTFDataSheet " !!!
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