I built a clock using ZM1032 Nixie tubes and multiplexed their anodes instead of their cathodes. The ZM1032 uses a 9-pin base, with five cathode pins, two anode pins, and a screen pin. See https://www.tube-tester.com/sites/nixie/dat_arch/ZM1032_philips_02.pdf The odd digits use a front anode, the even digits use a back anode. There is a screen in between the even and odd cathodes, tied to 60v. The screen blocks some of the light from the even cathodes, so I increased the "on" time of the even anode. It's just about double the "on" time of the odd anode. A similar circuit is describe at https://www.dos4ever.com/nixie1/nixie1.html#zm1030 however they used different current-limiting resistors for the even and odd anodes where I used the same value but used different "on" times for even and odd anodes.
On Tuesday, August 27, 2024 at 8:22:00 PM UTC-4 Senk Ju wrote: > Adam, to add to my previous response, you are of course absolutely > correct. I don't know what I was thinking when I gobbled together that > schematic. Xavier, please ignore this part of my schematic. Sorry for the > confusion. > > Adam Piórko <[email protected]> schrieb am Mi., 28. Aug. 2024, 00:57: > >> Controlling with ground (cathodes) is correct. However, controlling with >> positive (anode) is not correct. Controlling with the positive is more >> challenging. >> Attached are two options—using a phototransistor (on the left) and using >> two transistors (PNP and NPN). Of course, there are more options... >> Of course, instead of connecting the anode control to a microcontroller, >> you can use a 4017. >> R2 and R5 are current-limiting resistors. >> >> poniedziałek, 26 sierpnia 2024 o 23:26:33 UTC+2 Senk Ju napisał(a): >> >>> I unfortunately don't have any resources but what I would recommend >>> doing is the following: >>> >>> Use a decadic counter IC (like the CD4017) for controlling the active >>> tube. If your clock has four digits, connect the fifth output of the chip >>> to its reset pin. Also connect the reset pin to your microcontroller so you >>> can reset it after the clock has been enabled. Pulse the clock pin of the >>> chip to switch to the next tube. >>> >>> Use a BCD to decimal decoder (like the CD4028B) for the cathodes. This >>> way, you will only need four IO pins of the microcontroller to display set >>> the current digit. >>> >>> Connect the output pins of the decadic counter and BCD decoder to high >>> voltage transistors like MPSA 42 to control the high voltage. Then connect >>> the same cathode of every tube in series through the corresponding >>> transistor connected to the BCD decoder. This way you can control which >>> anode gets HV and which cathode is grounded. >>> >>> >>> I have attached a simplified schematic of how I would do it. Hope that >>> helps. >>> >>> >>> Xavier Burton <[email protected]> schrieb am Mo., 26. Aug. 2024, >>> 22:38: >>> >>>> I have been working on a modular nixie tube display for the last few >>>> months as a learning exercise, and I would like to learn muiltiplexing >>>> next >>>> in order to reduce the number of pins used for controlling them. What are >>>> some good resources I can look at? >>>> The pictured unit with the energized tubes is my original prototype, >>>> hence the garbage wiring and excess number of test points. The other >>>> pictures are the current pre multiplexing version. >>>> >>>> -- >>>> 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/CAOt79-vM7Zudj-ts%2B%3DtH4mAogqU01VuMsrB3uH0UugRNzJbHzQ%40mail.gmail.com >>>> >>>> <https://groups.google.com/d/msgid/neonixie-l/CAOt79-vM7Zudj-ts%2B%3DtH4mAogqU01VuMsrB3uH0UugRNzJbHzQ%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/510c3659-9023-467c-a436-042431aaa554n%40googlegroups.com >> >> <https://groups.google.com/d/msgid/neonixie-l/510c3659-9023-467c-a436-042431aaa554n%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/07bf3be1-d071-4109-885f-e18bc1a3590an%40googlegroups.com.
