> > > I don't see a way to dim just one digit. With multiplexing, as each > digit is selected the PWM rate could be set >differently, but I don't see > how to do it with direct drive. > > Dimming individual digits is possible with hardware control, but probably not with software. The idea is to resend the serial data to the HV5530's twice every few milliseconds or so: Once to turn off the digit(s) to be dimmed, then again to turn all digits on. By adjusting the on and off times, you are doing PWM. I have 2 cascaded HV5530's (64 bits), and I clock them at 1.5Mhz, so it's possible to do PWM up to a few kHz.
> A 14 digit IN-18 clock sounds interesting. What are you doing with the > extra digits? > I went overboard, so it displays hours, minutes, seconds, date, month, year = 14 digits. My wife saw the nixie clock in the movie "Tomorrowland" and ordered me to build one for her (yeah, like I'm going to say no ???). I saw no purpose for 12 digits, so I super-sized it to 14 digits. To level-out the tube usage, I swap date and time locations hourly, then run a depoisoning routine at 4AM for 1 hour. The clock will be in our vacation home, so the tubes will be off most of the time. It will be an art-deco theme, in a wooden case complete with 2 large toggle switches and 1950's-era incandescent panel lamps. I expect it will be 30 inches wide x 5 inches deep x 5 inches tall. I'm leery about the reliability of non-Burroughs tubes, and we already have 3 nixie clocks running 24/7 (why not, they are Burroughs tubes....) in our permanent home. -- 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 post to this group, send an email to neonixie-l@googlegroups.com. To view this discussion on the web, visit https://groups.google.com/d/msgid/neonixie-l/ff087b7e-c23d-4a93-b723-4ac10830957b%40googlegroups.com. For more options, visit https://groups.google.com/d/optout.
