I can try to modify the Omnixie HV module if higher voltage shows promise. The module will be a little bit of a challenge as it has really small parts and I have a rework gun that might be on the large side and melt everything around the target resistor.
On Thursday, November 30, 2023 at 2:25:17 AM UTC-6 Jon wrote: > I think the best approach would be to increase the HV. If you look at the > discussions of glow physics in Weston or Acton for example, the lag in > striking a glow from dark (which is what we're talking about here) is > reduced by using an anode voltage materially above the threshold striking > voltage. Overdrive is a matter of tube current rather than anode voltage > per se, so a simple compensatory tweak to the current-limiting resistor > value will get you back to the same tube current as now. The cost of the > change will be a little extra power dissipated in the current-limiting > resistors, but that should be immaterial in most circumstances. > > Jon. > > On Thursday, November 30, 2023 at 3:27:11 AM UTC gregebert wrote: > >> UV light source, such as from an LED ? >> >> On Wednesday, November 29, 2023 at 6:43:48 PM UTC-8 Jeff Walton wrote: >> >>> I've recently come across a situation where I have some tubes in a clock >>> that are being directly driven and are having trouble starting when the >>> room is darkened but light right up when a room light is turned on. These >>> particular tubes were probably intended for use in a calculator. They are >>> seven segment neon MG-17G tubes. Once the tubes have any of the segments >>> lit, there is really no issue with the performance. It's when the tubes go >>> completely dark if a space is used while scrolling a message or lighting a >>> dash on and off to emulate a colon. I'm wondering if others have found any >>> particular tricks to help convince tubes to light up. There is no >>> "baselighting" and the HV is ~172v. I'm considering increasing the HV by >>> 10-15v but don't want to over drive the tubes. Short of putting a >>> radioactive source in the vicinity, are there other things that anyone has >>> had any luck with? >>> >>> Jeff >>> >> -- 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 neonixie-l+unsubscr...@googlegroups.com. To view this discussion on the web, visit https://groups.google.com/d/msgid/neonixie-l/7ceb877a-6622-409a-8914-47debe6706e1n%40googlegroups.com.
