I would start by taking a look at the "Mod Six" 7971 clock by the team over at badnixie.com. This has pretty much been *the *clock for 7971s, as it is loaded with features and is by all means a professional quality product.
http://www.badnixie.com/MOD-SIX_Info_Page.html Check out the assembly guide for schematics of all the circuits. You will get a good sense of the general topology required to drive the tubes. You can also watch a video I made of assembling my own mod six here: https://youtu.be/jd8zp5yjdWA This might give you a better tangible representation of what the circuits look like and how they are combined. On Fri, Aug 9, 2019, 1:29 PM newxito <axta...@gmail.com> wrote: > In 2016 I bought some B7971 to build a clock, not the best tubes for a > beginner with no skills in electronics. Until now I have not even tested > these tubes. But now, after building some clocks with numeric nixies I > think I'm ready to design a board for a 6-digit clock. > > I know that these tubes are hard to find a very expensive these days, so I > don't want to mess it up. > > The design will have a fuse for the 12V, another fuse for the 170V, > reverse, over and under voltage protection and a temperature sensor for the > HV PSU. Just to be on the safe side :-) > > I found the datasheet and a lot of information on the internet. I know > now, that I should use different cathode resistors for the different > segment lengths, but I still have questions about the max. current limit > (21mA): > > - I don't want to go to the limit, 18mA max. Is it ok to choose the > resistors to be able to light up all 15 segments at the same time? (average > 1.2 mA/seg). Or is it better to drive the segments with a bit more current > (2mA) and limit in the software the number of concurrent segments to 9? (0 > has 8 segments + underscore according to the font in the datasheet) > > - Do I need some kind of anode current limiter? > > -- > 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 neonixie-l+unsubscr...@googlegroups.com. > To view this discussion on the web, visit > https://groups.google.com/d/msgid/neonixie-l/8940d162-56fd-4403-a954-b4b6dd03766a%40googlegroups.com > <https://groups.google.com/d/msgid/neonixie-l/8940d162-56fd-4403-a954-b4b6dd03766a%40googlegroups.com?utm_medium=email&utm_source=footer> > . > -- 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 neonixie-l+unsubscr...@googlegroups.com. To view this discussion on the web, visit https://groups.google.com/d/msgid/neonixie-l/CALcVLKKJc4%2BVEXBXYOC_xUs9KhOuQmHxvcJ0WhqoAvwiJbauaA%40mail.gmail.com.
