You must be careful with the filament. The filament will accept whatever current you give it. Overtime, constant voltage source on the filament is problematic. As such - for sure- drive the filament with an AC wave There is lots of corollary info on this blog regarding the filament. https://hannahmishin.com/blog/2017/4/30/russian-tri-color-vfd-indicator-clock I accidentally drove some Itron VFD - overdrove the filament and ult. killed the VFDs. I am controlling the brightness of my current vfd clock by modulating the filament current. meaning if you underdrive it - it will be dim, if you use the circuitry linked in the blogpost, you really will find it hard to overdrive it. also -> http://www.noritake-itron.com/subpages/applicnotese/vfdoperapn.htm
http://hannahmishin.com/ On Fri, Jul 17, 2020 at 4:24 AM Jasper C. <jaspern...@gmail.com> wrote: > > > On Friday, 17 July 2020 01:56:47 UTC+8, Paul Andrews wrote: >> >> What power supply are you using? I seem to collect power supply design >> almost as much as Nixie tubes. >> >> > > I'm planning to use an LM9022 based supply. Yes, it's out of production, > but apparently it's the same as an LM4871. > > And yes, it's overkill for a single IV-17, but I plan to start here, then > get one of those multi-digit tubes to play with. Having one PSU design > will cut down on the work. > > Thanks for all the replies. I'd never thought about managing inrush > current and burnout. I'm not sure it's possible to do with the LM9022, or > at least not with my level of analog know how. But it occurs to me that > the Vsupply for that chip is 2.0 to 5.5 V. I could use a > resistor-divider-set LDO to supply the LM9022, and use a digital pot + > small uC to do a "soft-start" by starting at a low voltage then ramping > up. As a bonus, since I plan to have a uC in the clock anyway, I can tie > the digital pot to that in my final design... > > -- > 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/5bab3541-effd-44bc-a61a-2e7fd64eb5aco%40googlegroups.com > <https://groups.google.com/d/msgid/neonixie-l/5bab3541-effd-44bc-a61a-2e7fd64eb5aco%40googlegroups.com?utm_medium=email&utm_source=footer> > . > -- 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/CAGeJ7TQe%3Dd2%3D5oE0MQ_UmM_qO0jkkgOF5A_cCbyzfoXB1RfG%3DA%40mail.gmail.com.
