Interesting. I've never used the decimal point in a nixie (only in VFD's). I've looked at the IN-12b before and still plan on doing what you are doing sometime. It would make sense that you will see different behavior of the decimal point depending on if the digit is lit, although I would have guessed the opposite behavior from what you are seeing. Worst case, you can always just multiplex the tube, so that it is off when the decimal is on. If it is done correctly, you'd never tell that the two weren't on at the same time.
-Adam On Thu, Dec 29, 2011 at 5:11 PM, Julien Noël <[email protected]> wrote: > Thanks you John, I just tested it and it works great. > > Just one thing; Is it normal behaviour that I've to turn on the digit and > the decimal point at the same time if I want the decimal point to bright ? > > When I try to turn on the decimal point when the digit is already on, > sometime the dot turn on correctly (normal brigh)t, but most of the time, > it doesn't turn on ( in that case, when I look very closely, I can see a > small light in the tube, but not really visible) > > Best regards, > > Julien > > > On 28 déc. 2011, at 23:23, John Rehwinkel wrote: > > >> I imagine the following solution (the dark black part of the schematic > >> here : http://dl.dropbox.com/u/46332604/IMG_1045.JPG). > >> I've to tell you that I didn't studied electronic and npn transistor > >> is very obscure to me. > > > > That is basically the right idea, but the decimal point needs less > current than the digits, so a series resistor between the transistor and > the decimal point will probably be needed to balance the brightness. > > > > - John > > > > -- > > 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. > > > > -- > 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. > > -- 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.
