<object width="425" height="350"><param name="movie" value="http://www.youtube.com/v/9SDrghJ5BEg"></param><param name="wmode" value="transparent"></param><embed src="http://www.youtube.com/v/9SDrghJ5BEg" type="application/x-shockwave-flash" wmode="transparent" width="425" height="350"></embed></object> This is a solid state musical Tesla coil. Tesla coils normally operate at a frequency inaudible to human ears, but the musical Tesla coil produces sound by rapidly turning on and off at audible frequencies.
