Mark, Interesting info, thank you!
What is your voltage and filament current? Regards, -Moses On Friday, November 18, 2022 at 12:21:21 PM UTC-8 Mark Moulding wrote: > I usually drive the filaments non-multiplexed from 74HC595 shift registers > (technically slightly out of spec, but have always worked fine), and use > the output enable line to PWM all of the displays at once for brightness > control. I run a separate PWM on each filament that's off, keeping it warm > to just below the level of visibility. > > I use a six entry look-up table for the PWM values, to create subjectively > similar steps in brightness. Most people seem to run my clocks at level 3 > or 4 (10/32 or 18/32 duty cycle, respectively). at level 6 (100% duty > cycle), the tubes see about 4.3 volts due to the drop across the -595 > outputs. > > I was a regular at Burning Man for quite a few years, but last went in > 2017. Now that it's happening again, I think we'll go back next year. > Glad you had a great time! > ~~ > Mark Moulding > > > On Thursday, November 17, 2022 at 5:55:57 PM UTC-8 [email protected] > wrote: > >> Mark, >> >> Going to try these posts again, not sure why they are getting deleted. >> Hope this makes it through. >> >> Good to hear on the IV-9 durability.. I've never ran them other then >> briefly on the bench. The specs on the IV9 show 3.15v and 20ma or so for >> the segments, which I believe may be underdriven already just looking at >> the color. They look pretty good at at 3.3v. What do you run yours at? >> >> Burning Man is awesome! My first burn was this year! Fun times! >> >> Regards, >> -Moses >> >> On Thursday, November 17, 2022 at 12:06:29 AM UTC-8 Mark Moulding wrote: >> >>> I've built quite a few devices using the IV-9 tubes, and found them to >>> be extremely durable. (I probably wouldn't be interested in a clock kit, as >>> I have about 3500 tubes in stock...) If operated below their maximum >>> operating parameters (dimmed a little, and soft-started filaments), they'll >>> run essentially forever. The DTF-104Bs are even better, and are really >>> fantastic-looking tubes. They're also extremely rugged mechanically. I've >>> built Burning Man Mutant Vehicle dashboards using these, and the rather >>> extreme conditions of that application didn't faze them at all. I've also >>> had clocks running for nearly a decade with exactly zero failure due to the >>> tube burning out. Impact with flying objects is another matter, but in >>> fact a tube survived for a minute or two even with its outer glass envelope >>> completely shattered. Again, if operated within their specified >>> environment, their lifespan is essentially unlimited. >>> ~~ >>> Mark Moulding >>> >>> On Wednesday, November 16, 2022 at 10:04:59 PM UTC-8 William Lee wrote: >>> >>>> Hi there. I'd be potentially interested in a numitron kit! >>>> >>>> On Wed, Nov 16, 2022 at 5:26 PM Moses <[email protected]> wrote: >>>> >>>>> Hi Everybody, >>>>> >>>>> I seem to have enough IV-9 tubes to where I can produce a batch of 100 >>>>> or so 6 digit numitron clocks. Thinking ESP32 powered like my last one >>>>> (Thank you to all those who gave suggestions, the kit came out great!). >>>>> I'm >>>>> thinking maybe try for a full through-hole solder kit with some shift >>>>> registers. >>>>> >>>>> I know nixies are more popular.. but anyone interested in a numitron >>>>> clock kit? >>>>> >>>>> Oh, one question I do have, anyone have long term experience (ie, >>>>> years?) running this particular tube? How do they fare? >>>>> >>>>> Thank you! >>>>> >>>>> Regards, >>>>> -Moses >>>>> >>>>> -- >>>>> >>>> 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 [email protected]. >>>>> To view this discussion on the web, visit >>>>> https://groups.google.com/d/msgid/neonixie-l/f461a854-20da-49f2-bf35-b8d5f50922cen%40googlegroups.com >>>>> >>>>> <https://groups.google.com/d/msgid/neonixie-l/f461a854-20da-49f2-bf35-b8d5f50922cen%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 [email protected]. To view this discussion on the web, visit https://groups.google.com/d/msgid/neonixie-l/ed320972-7b01-4d68-89d9-3e2f9cdb7f77n%40googlegroups.com.
