Will, This is the point (in case you hadn't noticed!) when a 'scope comes in real handy! You really want to pursue that - I use mine a lot for fault finding my designs! It will pay for itself in your time, Teach you loads and reduce frustrations.
I think your issue is not an AC (i.e. transistors not switching off in time) issue, but a DC (leakage currents) one. I might suggest a different arrangement for your anode drivers, tho. This is my own tried and tested arrangement: https://docs.google.com/leaf?id=0B3KTZNOahiFEZGY5NGJmMWUtNDE5Mi00NTgzLWI1NWQtMmMxZDQ3MTg3ZmUy&sort=name&layout=list&num=50 (i hope you can see that?) Also, I can save you at least two resistors and two transistors in your HT power supply. Junk that crappy old chestnut of a FET IRF740 (pah!) and get a decent low Vgs one from the likes of Toshiba 2SK3562, to name but one. These switch cleanly with a gate voltage of 5V, supplied STRAIGHT from your controller IC. Laurence -- 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 this group at http://groups.google.com/group/neonixie-l?hl=en-GB.
