On Monday, February 24, 2020 at 6:15:32 AM UTC+8, Terry Bowman wrote: > > > Cool. How many IN-13s did you have to buy to get sixteen that actually > worked properly? How many duds were there? >
Of the ~24 tubes I've looked at, 1 arrived with a broken leg and 4-5 were obviously out of spec (in that the indicator would not reach the top indicator level). I was able to "rehabilitate" the out-of-spec tubes by running them at ~150% maximum current (so about 6mA) for ~10 minutes. > What special tricks did you have to implement in software to get the GOOD > ones to behave? I've read that they need to be strobed at say 50Hz. More > info would be very welcome. > The main thing I'm doing is giving the auxiliary cathodes ~200ms to fire up before applying power to the primary cathode. This mostly eliminates any "detached" ionization, where the bar jumps up and moves around freely. I think IN-9 tubes generally require more clever stuff like strobing. If someone were to use my design with IN-9 tubes, they would probably want to increase the cutoff frequency of the PWM RC filter from ~300Hz to ~3000Hz and increase the PWM frequency so that they could more abruptly turn the tubes on and off. -- 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/8d0df604-31c2-419c-bdb3-4a0782b0a008%40googlegroups.com.
