Working on my Vacuum Flourescent Display (VFD) filament driver, I realized I have no easy way to test the saturation current of my home made inductors. Characterizing the inductors core material is necessary to creating an efficient transformer, so I built a test unit based on the principles of inductance.

After getting curious about vacuum tubes, nixie tubes, and later on vacuum flourescent displays (VFDs), I decided to go and give driving a VFD a shot. It seemed simple enough as I didn't need to use high voltages.