This project is a 6.78MHz (ISM band) plasma tweeter. It consists of a Class D audio modulator and a class E differential amplifier driving a resonator.
Schematics/PCB files in kicad format are in the PCB folder.
The PCB for the current hardware revision is on OSHPark: https://oshpark.com/shared_projects/XJNJnl8u
Compiled with and has a makefile for GCC
For the project to build you need to add the standard peripheral library and CMSIS library from ST to the lib folder.