Simple VFD anode and filament voltage generation
Simple VFD Power schematic

This is a simple saturating converter that supplies both the high voltage anode power as well as an AC filament driver centered around 5VDC to allow segments at zero volts to be completely off.  This same circuit was used to power a 32 character 14 secment VFD I was using back in the '80s.  The primary voltage, primary turns, core cross section area and core saturation flux density set the operating frequency:  The example should run about 10KHz.  See Calculators program for transformer design help.

  Any questions or comments?
This page last updated on June 28, 2009