Have some 365 and 395nm LED chips on order to experiment with. Will try some things when I get them. Hopefully they will help and I can hide them under the tube. I saw some 245nm LEDs but super expensive and larger.
On Thursday, November 30, 2023 at 9:28:27 AM UTC-6 Tidak Ada wrote: > Why not a trial with UV-LED’s 365 nm is a useful wavelength and you don’t > need to use then at full power. > > You can use them in a pulsed mode only during refresh of the display to > avoid too much O3 production. Iyt is not as hazardous as the use of > ß-radiating isotopes as used in rigger tubes. > > > > eric > > > > *Van:* [email protected] [mailto:[email protected]] *Namens > *Jon > *Verzonden:* donderdag 30 november 2023 9:25 > *Aan:* neonixie-l > *Onderwerp:* [neonixie-l] Re: Helping Nixie Tubes Fire in a Darkened Room > > > > 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 [email protected]. > To view this discussion on the web, visit > https://groups.google.com/d/msgid/neonixie-l/ee14735e-1e40-4c6b-a815-77e670e1c89cn%40googlegroups.com > > <https://groups.google.com/d/msgid/neonixie-l/ee14735e-1e40-4c6b-a815-77e670e1c89cn%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/2dba5431-0334-4dbc-a826-7b96cced80c5n%40googlegroups.com.
