Another technique is call "centre pull" where all anodes and cathodes are connected to a 90V supply (potential divider across 180V supply to ground) via high value resistors (say 470k). Used in this design.
http://www.sgitheach.org.uk/nixie6.html It means any residual charge is bleed off the electrode when you switch it off using the transistors and the unused electrodes float to the mid voltage point. Not my invention! But I always have found it effective with multiplex designs. Grahame On 21 May 2014 14:19, Cristinello <[email protected]> wrote: > Thank you very much for your proposals but unfortunately none of them > really work. I tried to modify my timings as Mr David suggested but it does > not get rid of the ghosting. I modified also the 100k resistor and that > does not really work either. Any other ideas? Thank you! > > marți, 20 mai 2014, 19:01:22 UTC+3, threeneurons a scris: > >> Yes, alter your timing, as David suggested. >> >> But also, those 100K resistors across the bases and emitters, of those >> A92s can be made smaller. Say 10K. The junction, will keep the voltage >> below 0.7V, so most of the current will still flow thru those junctions. >> Those resistors' primary purpose is to bleed off charge once the voltage >> drops below that 0.7V junction, and it starts looking like an open circuit. >> >> Though, Its more likely a timing issue. >> >> On Tuesday, May 20, 2014 5:43:16 AM UTC-7, Cristinello wrote: >>> >>> Hello guys, >>> I built a relatively simple nixie clock and I am encountering severe >>> ghosting issues. To drive the mainboard I used an Arduino ( because I lack >>> programming knowledge) . I will attach the schematic and the .ino file from >>> the Arduino IDK . The schematic does not contain the nixie board beacuse it >>> is a modular design but it is straightforward. I am using 4028 BCD to >>> decimal decoder to drive the nixies and the transistors are SMD versions of >>> the FMMTA92 and 42. The power supply has also a strange behaviour , when >>> left without any consumer , the output voltage is going down wih aprox >>> 1Volt/30 seconds. If someone has any idea about what may be wrong I will be >>> very very grateful .Thank you in advance! >>> >> -- > 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 post to this group, send email to [email protected]. > To view this discussion on the web, visit > https://groups.google.com/d/msgid/neonixie-l/70c37e3f-4cbc-4dbb-8368-9c3d4d8e643a%40googlegroups.com<https://groups.google.com/d/msgid/neonixie-l/70c37e3f-4cbc-4dbb-8368-9c3d4d8e643a%40googlegroups.com?utm_medium=email&utm_source=footer> > . > > For more options, visit https://groups.google.com/d/optout. > -- 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 post to this group, send an email to [email protected]. To view this discussion on the web, visit https://groups.google.com/d/msgid/neonixie-l/CABU2wDB9M4UzkzCbgbOSRBXH5fpbZY7x2Lr7n6hPhdm7z_hS1w%40mail.gmail.com. For more options, visit https://groups.google.com/d/optout.
