I've seen similar circuits when the Nixies have been driven from digital clock ic's like the MM5309-series but then the Nixies have had separate anode resistors too.
/Martin On Tuesday, 11 June 2019 22:45:22 UTC+2, Paul Andrews wrote: > > I just came across this: http://www.glowbug.nl/neon/944125938_2356.gif > (which seems to be an excerpt from > https://archive.org/details/ElectronicCircuitsManual/page/n209) and would > be interested in a critique of it from people who know more than I do about > electronics - which is just about everyone here! > > The cathode controls are pretty standard fare for multiplexed tubes - > including clamping the off cathodes to 75V (it is low enough to stop them > acting as anodes, but high enough that they won't glow). I'm more > interested in the anode controls. In particular: > > > - Using capacitors to de-couple the 5V signal from the 200V rail (I > assume)? > - Tying the collector of the transistors to 110V, presumably to keep > the voltage across the transistor within its limits, though I'm not sure > what actual voltage would be present across them, because: > - The anode resistor, which is shared by all anodes here, apparently > varies from 180 to 300 Ohms. Is that a misprint? Can it be that low > because > of the multiplexing? Or is there something else going on here. > > Naturally now that I've seen it, I want to build it. Like I don't have > enough projects going on. > > -- 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/ab43bb42-40ad-4ca4-a510-e594a043cebd%40googlegroups.com. For more options, visit https://groups.google.com/d/optout.
