Thanks Sture, you probably missed my question a few posts above. I've tested it and the method works fine. But that's a major change for a board with 16 nixies, and I'm trying to avoid that.I was aware that the anode resistor causes the current to drop for the decimal point when a digit is turned on, but I didn't expect the big difference in brightness. As Martin suggested, I'll try using larger resistor values for the decimal point so the brightness difference might be less noticeable.
Andy Sture Nystrom schrieb am Sonntag, 14. September 2025 um 08:46:32 UTC+2: > Try and use a cathode resistor for each cathode and one resistor for the > decimal point. > You will not have any anode resistor, it’s swapped to the cathodes > instead. > > > > On Sat, Sep 13, 2025 at 16:11 Dekatron42 <[email protected]> wrote: > >> Have you checked circuit diagrams for clocks or calculators how they have >> designed the circuit around the decimal point? >> >> Burroughs used 180k for the decimal point with their B5750 Nixies so >> twice what you have tested. >> >> /Martin >> >> On Saturday, 13 September 2025 at 08:41:34 UTC+2 newxito wrote: >> >>> Is there a better solution than removing the anode resistor and using >>> separate resistors for all cathodes? >>> newxito schrieb am Freitag, 12. September 2025 um 17:35:16 UTC+2: >>> >>>> I took a few current measurements, all with 170V, 15K anode resistor >>>> and 82K cathode resistor for the decimal point. >>>> >>>> The first measurement was just to check if the anode resistor is >>>> correct. With the digit 3 turned on, the current was 2.13 mA. Should be >>>> 2.5 >>>> mA, but I think 2.13 is still ok. >>>> >>>> Then I measured the current through the decimal point cathode with only >>>> the decimal point turned on: 0.401 mA. This is kind of ok, should be 0.5 mA >>>> Then the same but with the digit 3 also turned on. The current dropped >>>> from 0.401 to 0.143 mA. >>>> >>>> Jarod Findley schrieb am Freitag, 12. September 2025 um 16:21:23 UTC+2: >>>> >>>>> Its looks like your voltage or amperage is high try cutting it back a >>>>> few volts or a miliamp >>>>> >>>>> On Fri, Sep 12, 2025, 7:45 AM newxito <[email protected]> wrote: >>>>> >>>>>> I have the problem with all my IN-12B... >>>>>> >>>>>> Schematic of the display: >>>>>> https://github.com/axtar/Nixie-Calculator/blob/main/Schematics/Schematic_Nixie_Calculator_IN-12_Display_Rev2.pdf >>>>>> If using the B version I populate the 82K resistors. If using the A >>>>>> version, I populate the neons and the 270K resistors. >>>>>> >>>>>> Schematic of the driver: >>>>>> https://github.com/axtar/Nixie-Calculator/blob/main/Schematics/Schematic_Nixie_Calculator_IN-12_Driver_Rev2.pdf >>>>>> Just the usual HV5622 thing... >>>>>> >>>>>> What resistor values are you using for your Bitcoin Ticker? >>>>>> >>>>>> Michail Wilson schrieb am Freitag, 12. September 2025 um 13:13:08 >>>>>> UTC+2: >>>>>> >>>>>>> Something is wrong. >>>>>>> >>>>>>> >>>>>>> >>>>>>> My project (Bitcoin Ticker) uses 8x IN-12B and they (hundreds of >>>>>>> tubes worth) don’t have that issue). I used the 12B since it has a >>>>>>> decimal >>>>>>> point on both sides. >>>>>>> >>>>>>> Have you tried another tube? What’s your project schematic? >>>>>>> >>>>>>> >>>>>>> >>>>>>> M1 >>>>>>> >>>>>>> >>>>>>> >>>>>>> *From:* [email protected] <[email protected]> *On >>>>>>> Behalf Of *newxito >>>>>>> *Sent:* Friday, September 12, 2025 1:09 AM >>>>>>> *To:* neonixie-l <[email protected]> >>>>>>> *Subject:* [neonixie-l] IN-12B decimal point >>>>>>> >>>>>>> >>>>>>> >>>>>>> I was told several times to use IN-12B instead of IN-12A with neon >>>>>>> bulb as decimal point. I finally tried that but I don't like it. Is >>>>>>> anyone >>>>>>> using the decimal point of an IN-12B in a project? When combined with a >>>>>>> 3 >>>>>>> or 8, the point is barely noticeable. Another problem I'm having is >>>>>>> that it >>>>>>> glows much brighter when no digit is lit. As soon as a digit is lit, it >>>>>>> gets dimmer. Is this normal or I’m doing something wrong? I use a 15K >>>>>>> anode >>>>>>> resistor and an 82K cathode resistor for the decimal point with a >>>>>>> voltage >>>>>>> of 170V. >>>>>>> >>>>>>> >>>>>>> -- >>>>>>> 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, visit >>>>>>> https://groups.google.com/d/msgid/neonixie-l/613d7d66-dcab-48ae-bd34-a5f714071e72n%40googlegroups.com >>>>>>> >>>>>>> <https://groups.google.com/d/msgid/neonixie-l/613d7d66-dcab-48ae-bd34-a5f714071e72n%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, visit >>>>>> https://groups.google.com/d/msgid/neonixie-l/c9cbf447-021e-4b3f-bf5a-b1871d3c94e6n%40googlegroups.com >>>>>> >>>>>> <https://groups.google.com/d/msgid/neonixie-l/c9cbf447-021e-4b3f-bf5a-b1871d3c94e6n%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, visit >> https://groups.google.com/d/msgid/neonixie-l/99a6b8db-7e7d-491c-b7e0-2df8ffc5eba9n%40googlegroups.com >> >> <https://groups.google.com/d/msgid/neonixie-l/99a6b8db-7e7d-491c-b7e0-2df8ffc5eba9n%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, visit https://groups.google.com/d/msgid/neonixie-l/4db7d31c-c250-4884-9d7a-78fb1e495513n%40googlegroups.com.
