I dont see any anode-resistors. How are you limiting cathode current ? Also, the diodes will trap the charge at the anodes; I cant do the math right now (t=CdV/I), but the charge will bleed-off during the 'dead' time when no anodes are driven to VOUTHV. I'm assuming here that +105V is not enough to maintain illumination. If you also turn off the cathodes at the same time you turn off the anodes (or before), the charge has no place to go. So make sure you turn off the anode first, wait several usec, then turn off the cathodes. Given the capacitance is a few pF, and current is roughly 1mA, I think there's more than enough time. But I see a lot of postings on this group about ghosting problems with multiplexed displays. Timing is critical.
On my designs, I try to provide a DC path to circuit ground for safety and ESD reasons. Surface mount resistors are small and cheap. -- 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/789068d8-494b-4912-8036-8772cb4b8a7f%40googlegroups.com. For more options, visit https://groups.google.com/d/optout.
