Very interesting; thanks for posting. You might want to try successive numbers of lit cathodes, say 01, then 012, then 0123, etc and see how the current increases, and also see if it changes over time due to heating.
I dont recall seeing this behavior with segmented tubes, like the 7971. In fact, on my clock I have a current regulator on each cathode, and another one for the anode, for every tube.....that works out to 128 current regulators on that clock. On Wednesday, March 31, 2021 at 12:18:08 PM UTC-7 Bill van Dijk wrote: > Just a guess, but I think by lighting them all up you get some kind of > “super ionization” in the tube, which could then increase the current and > heat dissipation. > > > > Bill > > > > *From:* [email protected] [mailto:[email protected]] *On > Behalf Of *Yohan Park > *Sent:* Wednesday, March 31, 2021 3:15 PM > *To:* neonixie-l <[email protected]> > *Subject:* [neonixie-l] Lighting all digits at the same time: Why does > this happen? > > > > I have a few Chinese QS30-1 tubes lying around which don't have much value > for me and was wondering how it would look to have all digits lit at the > same time. > So I looked up the specs which say 170V and 2.25mA > So I calculated the needed resistor to have it hooked up to 230V which is > a little below 27K > I then connected a 27K resistor to one cathode and it lit perfectly fine > (230V AC so the anode also glows). > So I then connected 10x 27K resistors to all the cathodes and plugged it > in. > Holy Moly! The thing lit up like crazy and was drawing over 9 Watts and > was getting VERY hot. So I turned it off again after a few seconds. > Can anyone tell why it's behaving like that? > > -- > 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/bffb114c-9810-4d65-8e98-ee13f6c860fcn%40googlegroups.com > > <https://groups.google.com/d/msgid/neonixie-l/bffb114c-9810-4d65-8e98-ee13f6c860fcn%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 [email protected]. To view this discussion on the web, visit https://groups.google.com/d/msgid/neonixie-l/21f05bc8-4855-46d2-88b9-5b034f90a59cn%40googlegroups.com.
