I looked at your driver schematics, and checked the transistor datasheet. The only possible culprit I see from a leakage perspective is the anode-driver; the NPN device has a 0.1uA Icbo (spec-max), and it could cause the PNP device to conduct several uA of current for an anode which is 'off'. The amount of current is hard to predict because its the product of NPN leakage, and the PNP's beta; both of these can vary significantly.
Cathode-driver looks solid; glad to see you used a high-voltage device. Other than that, if you have a scope, I suggest you check the cs1-cs6, and k.0 thru k.9 signals very carefully. Your eyes will definitely see a faint glow on a cathode even if it's only energized for a few microseconds. Can you describe the ghosting you see ? For example, If you illuminate a single '0', and all other digits are dark, do you see a faint '0' on the dark digits ? Are the ghosts about the same brightness, or do they taper-off ? If you display all digits with the same numeral, are there any ghosts ? If you display 123456, what sort of ghosting is seen at the 2 vs 3, etc ? Those are important clues. -- 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/252e3994-9aff-43cc-a26d-8706c0cfb9e4%40googlegroups.com. For more options, visit https://groups.google.com/d/optout.
