Sunday, August 10, 2025
VFD Filament Driver Circuit
Don't give up! I spent the last 3 years troubleshooting this circuit with an LM4871 chip with the goal of supplying a low voltage alternating square wave current across the filament of vacuum fluorescent displays. Spoiler alert: it was the addition of a single 10Ω resistor to lower the voltage from ~5V down to ~3.3V.
Labels:
circuitry
,
electronics
,
hardware
,
pcb milling
,
projects
,
vacuum fluorescent display
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