The problem is that a 365nm LED has a much wider spectrum, definitely
producing ozone. I have a floodlight with a 365nm COB-LED that I can smell. OK
It’s a 10W chip, but despite that.
Further, it’s fine to reduce the LED’s burning time to avoid their light and
color. That’s the main reason to start with only pulsing during transition of
the figures. I think the UV pulse may be short enough that it will be not
visible
The UV trick works also fine with dekatrons and other trigger tubes.
Cheers,
eric
Van: [email protected] [mailto:[email protected]] Namens
Christian Riise Wagner
Verzonden: maandag 4 december 2023 8:55
Aan: neonixie-l
Onderwerp: Re: [neonixie-l] Re: Helping Nixie Tubes Fire in a Darkened Room
You won't generate ozone with 365nm. You'd need shorter wavelength UVC for that.
søndag den 3. december 2023 kl. 09.25.35 UTC+1 skrev Tidak Ada:
Hi Jeff, good to hear you are content with my suggestion.
Two remarks: I bought at a time small 365nm transmission filter from a seller
at either AliExpress or Banggood. That reduces the amount of visible light
considerabele. Second, make that the UV flash only during a short period around
the firing of the of the nixie segments. That will reduce the production of
ozone considerable.
Cheers,
eric
Verstuurd vanaf mijn iPhone
Op 3 dec. 2023 om 08:09 heeft Jeff Walton <[email protected]> het volgende
geschreven:
I've done some testing with common 3mm UV LEDs that are in the 395nM range.
Running them at ~5mA provides a dim purple color light that when placed under
or in front of the tube actually makes the reliability of the ignition very
stable. Even in a fully darkened room, the segments and decimal points light
reliably.
This particular tube (MG-17G) has segments with no anode screen in front of the
tube, so they seem to behave a little differently than a regular nixie. I also
found that if I placed fingers on the sides of the tubes while operating, the
segments lit more reliably. I think that I will go for an LED under each tube
but powered just enough to make the tubes work better and not to try to supply
any visible base lighting. I will try 365nM LED's when they arrive and may use
them if there is less noticeable, visible light.
Thanks for the suggestions!
Jeff
On Wednesday, November 29, 2023 at 8:43:48 PM UTC-6 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
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