Well, they are tiny CRTs! On Fri, Oct 2, 2020, 3:10 PM martin martin <[email protected]> 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/CAKYv7NT7iKWUeanYPgTbW8cFPc2ieuYdV%3DcWJv4r0Go83%3DU_Hw%40mail.gmail.com > <https://groups.google.com/d/msgid/neonixie-l/CAKYv7NT7iKWUeanYPgTbW8cFPc2ieuYdV%3DcWJv4r0Go83%3DU_Hw%40mail.gmail.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/CALcVLK%2BHx4hjjBhUv55jvVQy2XGR-3UH2YJTkLVS%2BO9tdX_XGw%40mail.gmail.com.
