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Bulding an electronic dog whistle
The Ghost of General Lee wrote: Is it feasible to build an electronic dog whistle? I would like to push a button inside and have the "sound" emanate from a speaker outside. Of course, I want to confine myself to the frequencies outside the range of human hearing. Anyone ever pulled this one off? Google is your friend: http://www.mitedu.freeserve.co.uk/Ci...sc/whistle.htm |
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