"Those nimo look like tiny CRTs! If anyone can make them it’s Dalibor!"
Talk about a niche market. Not only are they infinitely more complex to construct than a Nixie tube, the market for them would be even smaller than for his Nixie tubes. I had commented on the short YouTube video that it would have been interesting if the manufacturer has made NIMO's available in other colors besides green. Red especially for critical indicators. Consistent anode voltages might have been problematic as different phosphors have different requirements. I have still seen some tiny 1" round CRT's up for sale from time to time. Might have an easier time getting and using those with custom logic to draw numerals. On Friday, October 2, 2020 at 3:10:56 PM UTC-4 martin martin wrote: > Those nimo look like tiny CRTs! If anyone can make them it’s Dalibor! > > * Are you following this ? > > On Fri, Oct 2, 2020 at 10:25 gregebert <[email protected]> wrote: > >> Jorg - Regarding the dead tube, have you compared the filament resistance >> of the bad tube to the others ? >> >> NIMO tubes have 2 parallel filaments, so if one is open, the resistance >> will be TWICE the value of a good tube. >> I think the cold resistance is around 3 ohms. >> >> If 1 filament is out, you can still get 5 numerals to work. >> >> I would be surprised if both filaments are burned-out, unless someone put >> way too much voltage on it, or the tube is cracked around the pins. >> >> If the filaments are OK, power-up the tube and make sure you get around >> 180mA of current. >> Then try varying the voltage between the filament and the logic driving >> the grids. If a grid is about 6 V more positive than the filament, you >> should get a numeral to turn on. >> >> On Thursday, October 1, 2020 at 1:44:20 PM UTC-7 jörg wrote: >> >>> Short update of my nimo project. >>> I've got 5 tubes running. The sixt is unfortunately DOA. >>> The tubes filaments are driven with three power supplies, with soft >>> start IC (load switch). >>> So the filament gets started very smooth. >>> I've made some experiments with multiplexing the tubes. >>> Which work nice, using the method described in the manual. The bias >>> voltage is changed for every tube, that should be on/off. >>> In the actual approch, I'm using direct driving the tubes via 74HC595 >>> shift registers. Got a plenty of problems at the beginning. >>> The power and signal lines for the 595 were messed with switching noise. >>> Some caps did the trick. >>> Really nice to view the working tubes. >>> >>> Video: https://www.youtube.com/watch?v=JbwfZhYhnlo >>> >>> jörg schrieb am Mittwoch, 15. Juli 2020 um 18:01:18 UTC+2: >>> >>>> I‘m using Eagle to layout. >>>> It takes time for me to feel comfortable with it. >>>> And Fusion360. >>>> >>>> -- >> 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/2ad71412-6a32-4a5f-91b4-5eb597c9e3ffn%40googlegroups.com >> >> <https://groups.google.com/d/msgid/neonixie-l/2ad71412-6a32-4a5f-91b4-5eb597c9e3ffn%40googlegroups.com?utm_medium=email&utm_source=footer> >> . >> > -- > [email protected] > -- 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/56e3905a-c6fc-42d4-8fd2-4620377b762fn%40googlegroups.com.
