Electrical engineering maestro Steve Ward, then a college student in Illinois, programmed this Tesla coil in 2007 so that each spark sounds like a musical note. In this now classic video, Ward shows off a stunning demonstration, which launched a new instrument now called the “zeusaphone” or the “singing Tesla coil.”
Whatever it’s called, it created quite a sensation. Singing Tesla coils were featured in the 2010 Disney film The Sorcerer’s Apprentice and in a 2011 live performance by Björk.
The video explains some of the science behind it:
This is a solid-state Tesla coil. The primary runs at its resonant frequency in the 41 KHz range, and is modulated from the control unit in order to generate the tones you hear.