On Friday, September 7, 2012 11:01:40 AM UTC-4, dr pepper wrote: > > Neon lamps will light from a very small current, I suspect you have a > leakage issue. > Try connecting a 100k or so from q9's base to ground to make sure the > tranny is off. > Maybe reduce the 33k feeding q9's base to 10k as well so the logic low > from the micro helps to hold it off. >
I gave this suggestion a try. When I reduced the base resistor to 10k the lamps became erratic. Can't really remember exactly what was happening but it wasn't right. I increased it to 22k and that worked better. I also added the 100k from base to ground. This has reduced the problem significantly. It's not quite as effective as the parallel resistor across each bulb, but it only requires me to add one component. > You also have the neons connected directly to the micro, you might > want to isolate the micro from the neons and use a similar anode > switching method as you have used with the nixies, one of the > protection diodes of the pic could be conducting causing the neon to > light. > Not sure what you meant by this. I don't have any neons connected directly to the micro. The lamps are connected between the anode drivers and the Q9 transistor. > > > -- 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]. To view this discussion on the web, visit https://groups.google.com/d/msg/neonixie-l/-/jJPl1jLIuNgJ. For more options, visit https://groups.google.com/groups/opt_out.
