One other thought Allen... What I believe is a simulation schematic shows 1 meg pull-downs on the base lines. These may not be necessary depending on other elements of your circuit in the real world.
My current design uses 595 shift registers and the outputs are high-Z when disabled (Output Enable not asserted). There is indeed a small amount of leakage current driving the transistor base lines when the 595 outputs are in high-Z - the display has a very faint glow on just a few segments that is not really visible in any but a dark room. The thing is, the faint glow won't matter in my design. The only time the outputs are in high-Z is during duty cycle modulation to control display intensity. The faint glow during the high-Z portion of the driving signal makes no difference. It's just not visible. Segments are solid on or off when the 595 outputs are driven. My circuit drives hard zeros when the display is dark but powered. I disable the HV power supply when I want the display dark and in an energy saving state. I opted not to include the pull-downs.Your mileage may vary! Again, best regards, Bob -- 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/e0b64554-4c34-4e43-b5fe-9c6cff66e839%40googlegroups.com. For more options, visit https://groups.google.com/d/optout.
