The datasheet IEE_Nimo_808.PDF that can be found on the internet mentions "Time sharing" (multiplexing) and I have just glanced at it to see if it would make the circuit simpler.
Is the brightness difference a problem? Is it possible to compensate for it by using a filter or by using a series resistor with the anode or by any other means? Thanks for sharing the data on the heater/anode measurements and the project as a whole! /Martin On Sunday, 25 September 2022 at 23:23:38 UTC+2 gregebert wrote: > Direct-drive. I never considered multiplexing them, though it might be > possible due to phosphor persistence. > Now that I've powered-up 4 tubes and gathered more data, I'm seeing > tube-to-tube differences in brightness which is not only visible, but also > measurable via anode current. That could complicate multiplexing. > > > On Sunday, September 25, 2022 at 1:35:50 PM UTC-7 Dekatron42 wrote: > >> Does your design run them multiplexed or direct drive? >> >> /Martin >> >> On Saturday, 24 September 2022 at 08:28:31 UTC+2 gregebert wrote: >> >>> It's not a dollars-and-cents answer. I've spent hundreds of hours, and a >>> fair amount of money on the research, design, debug and development to get >>> this very complex design working. At a future date, there will be a limited >>> number of tubes made available for sale by the co-sponsor of this project >>> and I will be making the design available for others to download (free of >>> course) once it's been proven to be stable and reliable with 6 tubes. I >>> will forewarn that the board has some challenging SMT parts, and requires >>> the FPGA to be programmed. It's just unfortunate that NIMO tubes are so >>> rare. >>> >>> On Friday, September 23, 2022 at 11:06:50 PM UTC-7 [email protected] >>> wrote: >>> >>>> How much did all this cost you? O.o >>>> >>>> On Sat, Sep 24, 2022, 2:05 AM gregebert <[email protected]> wrote: >>>> >>>>> Well, it's been a long haul since this project started in 2017, and >>>>> today was a major milestone with the arrival of 3 more tubes. They are >>>>> re-joining their sibling after 5 years. >>>>> >>>>> [image: IMG_0421.JPG] >>>>> >>>>> Filament data was gathered and verified to be consistent with the >>>>> first tube. so tomorrow I can begin powering-up each one individually and >>>>> gather more data before I dare take a chance and plug all of them into >>>>> the >>>>> clock. Besides, 3 more just landed at the airport and are waiting to be >>>>> delivered. >>>>> >>>>> More details to follow in the coming week, or weeks (plural) if there >>>>> are problems. >>>>> >>>>> [image: image.png] >>>>> >>>>> -- >>>>> 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/6bca9c12-017e-4844-8ee3-91845bafac4bn%40googlegroups.com >>>>> >>>>> <https://groups.google.com/d/msgid/neonixie-l/6bca9c12-017e-4844-8ee3-91845bafac4bn%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/2e069406-294a-4b16-9f2b-fa430f4978e2n%40googlegroups.com.
