Well, tried cleaning the board to the extremes, inspecting under microscope, removing the IDC-connector etc. and no change.
I’m feeling that i’m overlooking some simple, so i whipped up a set of wires connecting two nixies only by wires - only the 10 cathodes are connected, not the anodes. Now this is what happens: https://www.dropbox.com/s/q9x4ny1vg0dp6pt/Nixie7.JPG?dl=0 <https://www.dropbox.com/s/q9x4ny1vg0dp6pt/Nixie7.JPG?dl=0> https://www.dropbox.com/s/2rohr3z8pv1we68/Nixie8.JPG?dl=0 <https://www.dropbox.com/s/2rohr3z8pv1we68/Nixie8.JPG?dl=0> https://www.dropbox.com/s/tgpcqtu0y60nm7i/Nixie9.JPG?dl=0 <https://www.dropbox.com/s/tgpcqtu0y60nm7i/Nixie9.JPG?dl=0> https://www.dropbox.com/s/xay89ckasyb4ynj/Nixie10.JPG?dl=0 <https://www.dropbox.com/s/xay89ckasyb4ynj/Nixie10.JPG?dl=0> Can we all agree on it’s not the PCB that is at fault - it’s the tubes … Even if i ground the anode on the offending tube it still lights up. // Per. > On 07 Jun 2015, at 20:14, John Rehwinkel <[email protected]> wrote: > >> What is off camera is a regulated lab power supply set at 180 Volts. > > So, a DC supply, no multiplexing. > >> As you see, one of the other tubes is lit, too! >> >> So somehow the anode voltage is capacitively coupling inside the tubes to a >> nearby cathode and trough that, powering another tube. > > If it's a DC supply with no multiplexing, there's no AC component, and > therefore no capacitive coupling. > > What you're seeing is leakage, AKA resistive coupling. There's probably some > flux residue, dust, fingerprints, or similar on the board, providing > a high resistance leakage path, which is enough to get a partial glow like > that. > > - John > > -- > 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 post to this group, send an email to [email protected]. > To view this discussion on the web, visit > https://groups.google.com/d/msgid/neonixie-l/258279AC-5824-4C8F-AACF-6F7689ABDC3A%40mac.com. > For more options, visit https://groups.google.com/d/optout. -- 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 post to this group, send an email to [email protected]. To view this discussion on the web, visit https://groups.google.com/d/msgid/neonixie-l/A1EAF5F7-01A2-4D9C-A868-CAA8584E1616%40gmail.com. For more options, visit https://groups.google.com/d/optout.
