I build this Tesla coil as a hobby project while in college. This device is a high-voltage resonant transformer like a traditional Tesla coil. However, it has a solid-state driver that I designed to drive the coil at its resonant frequency (230kHz). The picture above shows a typical high voltage discharge. I am currently developing a more efficient resonant driver with an audio input to modulate the Tesla coil output, allowing it to play music through its plasma discharges.