I am currently working on a set of multi-digit panaplex displays. One is a 16 digit, 16 segment alphanumeric display and the other is 6 digits and 7 segments. Both were originally intended to be multiplexed across all the digits. There is a 'keep alive’ cathode and an 80v mid rail to keep the display just below firing level. A consequence is that both displays like some off-time before a new selection is made, otherwise I am seeing a very ‘hot’ display with arcing over to supposedly unlit segments. It’s a bit of a fine balance to get right, but software can cope with this.
John S > On 3 Mar 2019, at 10:03, Jasper C. <[email protected]> wrote: > > I'm still new when it comes to nixie tubes, and was reading this page > <http://www.decodesystems.com/re-how-nixies-work.html>, in particular the > "partial glow" that occurs if the prebias voltage of an "off" cathode is too > low. Wouldn't that imply that the ideal solution would be to pull the > cathodes to the supply voltage of the anode when their respective segment is > off? > > Only in this EEVblog video, starting at 14:25 > <https://youtu.be/hkbPJONJLfs?t=865>, he does just that and it doesn't go > well. I get that the anode voltage here is lower than the HV supply because > of the 22k resistor, though I don't understand why that then has the effect > that it does. Is the segment shorted to HV acting as an anode? (Which might > explain the higher current he's seeing.) > > Would a totem pole circuit like that work if the anode resistor was removed > and each cathode connected to the totem pole output by it's own resistor? -- 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/6D62EC78-FC6D-45BA-9A76-0448433FC928%40jsdesign.co.uk. For more options, visit https://groups.google.com/d/optout.
