Re: [neonixie-l] One slot on my clock keeps burning out tubes, while the others have been good for years. Thoughts?

When all of the cathodes in a single tube lose large patches of coverage in a short period of time, it still seems that it would be a failure of the gas mixture.  Over driving the cathodes for a period of time would cause an eventual loss of brightness but it should cause variations among

Re: [neonixie-l] One slot on my clock keeps burning out tubes, while the others have been good for years. Thoughts?

Could the photocoupler at HC2 be the culprit at all? When you change the tubes, is the brightness of the IN14 at that position the same as the rest? On Tue, Aug 16, 2016 at 8:10 PM, gregebert wrote: > Since it's multiplexed, it might be worth comparing the 'on' time of

Re: [neonixie-l] One slot on my clock keeps burning out tubes, while the others have been good for years. Thoughts?

Since it's multiplexed, it might be worth comparing the 'on' time of each tube (I'm guessing it's H2 on the schematic ?). You'll need a scope. Maybe there is a quirk in the controller firmware that leaves this particular tube on longer ?? There's also a slight difference in the circuit around

Re: [neonixie-l] Original evaluation PCB for the Burroughs BG12205-2 bar graph displays?

Thanks, Jon! BTW - does anyone know of a source for connectors for these, or how to make one? On Tuesday, August 16, 2016 at 1:44:55 PM UTC-5, Jon wrote: > > Care to share pictures / schematics with the rest of the list? >> >> I have some of those displays (Vishay-branded) and would like to

Re: [neonixie-l] Original evaluation PCB for the Burroughs BG12205-2 bar graph displays?

Thanks Jon! /Martin -- 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 post to this group, send an email to

[neonixie-l] Re: Dekatron Experiments

Nice! Could it be that you have a timing issue with the guides not being totally "off" when you do the reset? Or that the reset does not load the cathode enough so that the glow steps to a lower potential, being K9? You can also check what happens if you exchange the guides, then it should

[neonixie-l] Dekatron Experiments

Well, those who know me, know that I have attraction to dekatrons. Here's some of my latest tinkering. A long while back I designed a 4000 CMOS base pendulum circuit. It used a 4017 counter, and a 4013 flip-flop. I revisited that circuit, and came up with one that just uses on 4518 dual

Re: [neonixie-l] One slot on my clock keeps burning out tubes, while the others have been good for years. Thoughts?

Thanks for the response Nick, check out the pics I posted in the latest comment. Let me know if you want to see a different angle, LED light pollution got in the way a bit too.. On Monday, August 15, 2016 at 8:37:52 PM UTC-7, Pramanicin wrote: > > Brando, that sucks. What make and model of

Re: [neonixie-l] Re: Group document repository...

Nick- Google Drive, while not necessarily perfect, does offer the ability to restrict access to specific people. Set up this way, it would not allow anyone else with the link to use it. You can also set view/edit access at the individual level. Hope that helps... Best, Dylan On Aug 16, 2016

[neonixie-l] Re: Group document repository...

Not really - the link will leak and the rights are the same for all uses of the link, there is no user authorisation or permissioning control. Nick On Tuesday, 16 August 2016 12:18:43 UTC+1, Roddy Scott wrote: > > If the link is only available to members then would that not suffice? >

[neonixie-l] Re: Group document repository...

If the link is only available to members then would that not suffice? Suscriber only access? Just a thought. On Monday, August 15, 2016 at 2:49:21 PM UTC+1, Nick wrote: > > Making it public and a direct link doesn't address the access requirements > mentioned above - anybody with the link

RE: [neonixie-l] One slot on my clock keeps burning out tubes, while the others have been good for years. Thoughts?

Brando: I meant to say that all of the numerals inside of a single IN-18 tube in the H[X]:MM:SS position did the same thing as you described. My cathodes in the bad tube faded out from the top over a period of about a week or less and the failure began with little warning after operating