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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