The 4503 is an tri-state device -- do you need pullups on the outputs? I can't tell from a quick glance how you are using it. How about series resistors to the bases of the transistors? I see those on A1 thru A4. Without some series resistance your driver can only go to .7 (Vbe) and I'm not sure how well it will like being clamped that low.
On Apr 3, 11:31 pm, Zitt <[email protected]> wrote: > Work on the Nixie display has stalled because I can't seem to find the > cause of a specific problem. > > Last week I put the “Tested” nixie display into my Bally Star Trek; and > sadly – only digits A4-A1 work. A5, A6 won’t light. > Tonight I cut the D5 trace between Q5 and U4; and hard wired from the pin2 > side of R44 to the base of Q5 and Digit 5 lit. > This means that my logic must be flawed at U3A and U4; but apparently can’t > see the forest for the trees. > > Maybe a second set of eyes would indicate the problem? Anyone feel like > looking for a > bug?http://www.Pinball-Mods.com/blogs/wp-content/uploads/2013/01/Bally7Ni...<http://www.pinball-mods.com/blogs/wp-content/uploads/2013/01/Bally7Ni...> > The tester doesn’t indicate there is a problem; so wondering if it’s a > timing issue I’m missing. -- 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]. For more options, visit https://groups.google.com/groups/opt_out.
