If the new board designs work well, I'll probably make some kits available without tubes.
I'm working now on a B7971 version that will use six tubes, with an add-on board to make it eight digits. The circuit design for this one is much simpler. It will use a Taylor power supply, same as all of my Nixie designs. It will be direct drive, so it can't use the HT16K33 chip. The driver software will be different. Otherwise operationally it will be the same as the first three word clocks. Because the tubes only have 14 segments, Russian won't work, and Klingons won't be happy. On Thursday, November 28, 2019 at 12:20:13 AM UTC-5, Richard Scales wrote: > > Also, check the Thyratron clock by Paul Andrews, he found some LED's that > matched the Thyratrons nicely, these (or similar) might work for you. > > On Tuesday, 26 November 2019 12:19:55 UTC, 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 [email protected]. To view this discussion on the web, visit https://groups.google.com/d/msgid/neonixie-l/48d5426c-f840-4598-b5d4-3966cc9d1b78%40googlegroups.com.
