I wonder if the resistors accross the ne2's is shunting current from one nixie anode to the one next to it, as the resistors are in series affectively from one anode to the next when q9 is off. If you get the same number ghosting then this could be the case, ie if one nixie is lit 2 and the one next to it it dimly lit 2. The only solution that springs to mind immediately is having 4 'q9's', one mpsa42 per neon then there wont be any shunt resistance taking effect, in fact if you did this all the measures you've taken so far probably wont be necessary, maybe you've reduced the component count too much, at least you'd be able to drive 4 mpsa42's from the same o/p on the pic.
On 12 Sep, 16:37, Ron Schuster <[email protected]> wrote: > When I said this worked well, I had only tried this on one lamp, and it > blanked that one nicely. Now I tried adding the resistors on all the lamps. > This works fine for the lamps, but it's causing problems in the nixies; > parts of the anodes and/or cathodes are glowing where they shouldn't be. > > > > On Saturday, September 8, 2012 2:29:30 PM UTC-4, threeneurons wrote: > > > A simple way, is to bypass the leakage. Tack a 470K resistor across each > > neon bulb. > > > It only takes a few 10's of microamps, to make it glow a little. With a > > 470K resistor, there needs to be at least 140uA, before the voltage gets > > high enough (65V) to even begin to start glowing. If there still is some > > glowing, then it may be a ghosting issue, someone else mentioned. But, if > > its ghosting, you should also see it at the nixies.- Hide quoted text - > > - Show quoted text - -- You received this message because you are subscribed to the Google Groups "neonixie-l" group. To post to this group, send an email to [email protected]. To unsubscribe from this group, send email to [email protected]. For more options, visit https://groups.google.com/groups/opt_out.
