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Old 11-09-2007, 12:55 PM   #5
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Location: Belgrade, Serbia
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Originally Posted by keithb View Post
The theory is pretty simple: if you want to play a 1000Hz tone, turn the coil on and off 1000 times per second. Execution is a bit more complex (and dangerous)
I believe those things work on frequencies from 25kHz to couple of MHz. Those guys use some kind of digital modulation to achieve the sounds.
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