> Thanks everyone for answers, I will probably use some cheap VFD to test the > 9.2% PWM @3,3V on high frequency. I'll measure current and will look on it on > oscilloscope to see on which frequency the filament will be heated so > frequently, that it won't have time to really cool (current will be flat > enough on all ON time). I will also test if any kind of soft-start is needed > (rushing 3,3V through cold filament sounds risky).
This is where a series resistor or capacitor comes in handy. They will limit the amount of current allowed to flow through a cold filament. > I've found one project, where author built a H bridge to be able to imitate > AC. My suggestion of using a MOSFET driver amounts to the same thing (it's not original to me, I lifted the idea from Konstantin). > I think that it might be the way to go, combining H bridging with PWM. I'm fond of it. If you use a capacitor as the dropping element, current goes to zero if PWM is off, which is an easy way to turn off the filament. - John -- 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 post to this group, send an email to neonixie-l@googlegroups.com. To view this discussion on the web, visit https://groups.google.com/d/msgid/neonixie-l/EF36EC5D-4EC4-4127-9437-A6CB0CC36534%40mac.com. For more options, visit https://groups.google.com/d/optout.
