It looks like you are using PWM dimming. Can you disable it for now, and then focus on optimizing dead-time between cathodes and the anode timing.
I'm fairly certain you want to turn OFF the anode before changing the cathode signals, allowing some dead-time, then turning on the next anode. I cant tell from the waveforms above if there is any dead-time or overlap/underlap. On Thursday, January 7, 2021 at 11:05:27 AM UTC-8 Bill van Dijk wrote: > This is a 1x4 multiplex, each tube is lit 25% of the time if no “dead > space” is built in the software. I have not checked the data sheets, but it > looks strange that the 0 output from the 74141goes to the 1 of the tube, > and so on. Anyway, with your problem, program a space between switching > digits, length to be experimentally done since different tubes switch > faster than others. The other thing to try is a resistor of a few hundred K > between the tube anode and ground to dissipate the space charge in the tube > quicker. (not sure if that works; I have not tried that myself). Generally > speaking it is not recommended to multiplex Nixies, it surely dims them. > > > > *From:* [email protected] [mailto:[email protected]] *On > Behalf Of *Mateusz Dziuba > *Sent:* Thursday, January 07, 2021 1:27 PM > *To:* neonixie-l <[email protected]> > *Subject:* Re: [neonixie-l] IN-4 ghosting, once again. > > > > I did not develop specific circuit diagram for my clock, but it is build > around this project: (please don't mind wrong polarity of opto. Someone > draw it wrong.) > [image: e44b2492e18895184e259a89f71556fc.jpg] > > czwartek, 7 stycznia 2021 o 18:32:35 UTC+1 Bill van Dijk napisał(a): > > Can you post the schematic? First I notice that a bright 1 has a ghost 2, > and it seems every number has a ghosted lower number. Could be timing > (discussed many times), or perhaps the KD1551s are too slow depending on > your multiplex speed. What is you multiplex sequence, i.e. 2x3, 3x2, 1x6 ? > > > > Bill > > > > *From:* [email protected] [mailto:[email protected]] *On > Behalf Of *Mateusz Dziuba > *Sent:* Thursday, January 07, 2021 12:21 PM > *To:* neonixie-l <[email protected]> > *Subject:* [neonixie-l] IN-4 ghosting, once again. > > > > Hi all, > > > > I am working on nixie clock and experiencing ghosting between neighboring > tubes. Please see attached photo. > > > > [image: 1.jpg] > > > > I am using 6xIN-4 nixies, Arduino with Atmega328, 6xTLP627 transoptor for > driving anodes and K155ID1 chip for driving cathodes. I am multiplexing > nixies in interrupt. Code attached. > > > > What i tried so far: > > 1. I connected 10x 1N4148 fast switching diodes from cathodes bonding > points to mid voltage of 90V. It didn't help a bit and increased power > consumption only. > > 2. I removed the diodes and tried "center-pull" all anodes and cathodes > bonding points through 500k ohm resistors. Didn't help, although reduced > decay of anodes after switching off. > > > > Some photos below: > > [image: 4.jpg] > > [image: 5.jpg][image: 2.jpg][image: 3.jpg] > > > > What comes to my mind, I might try to increase/rewrite blanking interval > but i am not sure how to do it inside interrupt. Maybe I should rewrite it > to the main loop. > > > > All help, comments, suggestions are welcome. > > -- > 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/ed921226-078c-4a66-bae2-bf79fad2b9b8n%40googlegroups.com > > <https://groups.google.com/d/msgid/neonixie-l/ed921226-078c-4a66-bae2-bf79fad2b9b8n%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/e3a07d84-34e0-4f4a-9ab1-65ff8e128d2dn%40googlegroups.com > > <https://groups.google.com/d/msgid/neonixie-l/e3a07d84-34e0-4f4a-9ab1-65ff8e128d2dn%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/2cf9fe74-038e-4357-9269-1ea901c39f97n%40googlegroups.com.
