Plasma Speaker

I built a plasma speaker based off a flyback transformer taken from an old crt monitor.

A function generator is outputting a 100kHz square wave into a mosfet. An audio amplifier is outputting the music at about 40v peak to peak from a computer into a second mosfet in series with the first. The output from the mosfet was fed into a flyback transformer with about a 30v power supply. During operation both mosfets, which are mounted to heat sinks, get pretty hot at around 120F after 5 minutes.

This design is not optimized and produces rather poor quality music in some conditions, but it is really simple.

Plasma Arc