Thanks, Richard. Good idea, especially since those tubes are so cheap. I'll put that on the list, which is getting smaller by the day. The 30v supply should be able to handle many more tubes. I'm not sure about the filament supply, though. A second board using an additional HT16K33 will add up to eight tubes, or seven and colons.Or maybe one board that holds 15 tubes.With 15 tubes it can also run the Union Square Metronome clock display.
The B7971 boards should be here next week. Some software work will be needed because the tubes are directly driven using HV5530 chips. The HK16K33 and driver chips are not used because I didn't want to multiplex them. It is a six digit board, but a two digit add-on can be connected to the right side to add another colon, and two more tubes. On Tuesday, December 3, 2019 at 11:17:00 PM UTC-5, Richard Scales wrote: > > From the photo I can see that you have mounted the tubes on tube carrier > boards - great idea for those tubes - so many legs to solder! > As bill suggested, more tubes would be lovely, could you even make it > modular? > 8 or 10 tube versions would be most welcome. > > Richard > > > On Wednesday, 4 December 2019 03:53:14 UTC, martin martin wrote: >> >> those curvy tubes look great! >> Where can they be had? >> >> On Tuesday, November 26, 2019 at 4:19:55 AM UTC-8, Mitch wrote: >>> >>> >>> >>> I was a little surprised that the power supplies worked the first time. >>> A LM2576 is used to drop the supply voltage to 5v. Two 34063 chips raise >>> that voltage to 32v, and lower it to 1.65v. The datasheet and online >>> calculators for the 34063s made that part easy. >>> >>> The next revision will use separate tube boards. Curiously the tubes I >>> have with 1990 date codes aren’t very bright. The 1987 versions are good. >>> >>> I can’t seem to find matching LEDs for the blue-green color, to use for >>> colons. Otherwise everything works as it should. >>> >>> >>> >>> >>> >>> [image: IMG-0185.jpg] >>> >>> -- 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/6da0076b-a389-4f61-be25-ab5e5f4d94f2%40googlegroups.com.
