Where can I get cheap high frequency sound generators. I was thinking of something like the sirens in smoke alarms that I can drive at their fundamental frequency or at harmonics.
Another possibility is piezoelectric film that I saw demonstrated many years ago.
Bill
-- Iraq: About three Virginia Techs a month
You may well be able to use piezo tweeters beyond the audible range.
Some of these are specced up to 30 kHz.
Graham
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