I use H bridges for my VFD designs. The VFD heaters are designed to run as slow as 50Hz, as the thermal inertia is more than sufficient for a steady display. There will be no beating. I generally run them at about 200- 500 Hz. The bias needed is negligible, just enough to make the anodes slightly negative relative to the heater - 1 volt is usually plenty. It is, as you say, equivalent to half the P-P AC voltage.
For individual tubes, AC drive is not really needed. All the segments will be the same brightness. It only becomes important with a long multi digit tube, which can show a real brightness gradient from end to end on DC. -- You received this message because you are subscribed to the Google Groups "neonixie-l" group. To unsubscribe from this group and stop receiving emails from it, send an email to neonixie-l+unsubscr...@googlegroups.com. To view this discussion on the web, visit https://groups.google.com/d/msgid/neonixie-l/83e23ac6-e496-4af6-8ca3-7be542e9ca8fn%40googlegroups.com.
