View Single Post
Unread 11-09-2007, 01:55 PM   #5
Ivan
fsck!
 
Ivan's Avatar
 
Join Date: Nov 2006
Location: Belgrade, Serbia
Posts: 567
Thanked: 3
Ivan is a glorious beacon of lightIvan is a glorious beacon of lightIvan is a glorious beacon of light
Quote:
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.
Ivan is offline   Reply With Quote