Re: [neonixie-l] Re: Simple discrete circuit for dimming Nixies with an LDR?

['M W' via neonixie-l]

Light Dependent Resistor (Usually a Cadmium Sulphide device)
  Mark
  From: Zitt 
 To: neonixie-l  
 Sent: Tuesday, November 20, 2018 12:22 AM
 Subject: [neonixie-l] Re: Simple discrete circuit for dimming Nixies with an 
LDR?
   
LDR?

   

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Re: [neonixie-l] Re: Adding audio clips to a clock...

['M W' via neonixie-l]

The story I remember on these (from quite some time ago) was that they were 
based on memory chips that had faults; The faults (in 8 bit or whatever audio) 
don't make a big difference (they could filter the POP's out I'd think) so 
they're CHEAP and this is a pretty good solution. They make these into those 
"singing Christmas Cards", or Birthday cards etc. - Those at a Dollar Store are 
a cheap source of the ICs if they ever get rare. (Which I doubt will happen.)

  Mark

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Re: [neonixie-l] EBay Listing for 7971 Tubes - Be Careful!

['M W' via neonixie-l]

Report THAT behavior to eBay, they don't much like people going outside of eBay 
like that! Seems deserved for someone like that.
  Mark
  From: Jeff Walton 
 To: neonixie-l  
 Sent: Thursday, November 2, 2017 9:52 PM
 Subject: [neonixie-l] EBay Listing for 7971 Tubes - Be Careful!
   
https://m.ebay.com/itm/1-pc-HUGE-B-7971-B7971-NIXIE-TUBE-FOR-COOL-CLOCKS/253238131300?hash=item3af62b3a64:g:otUAAOSwPGlZ3utx


This seller is back again and the same photos of B7971 are displayed.  
Originally seen in August 2017.  There are obviously bad tubes and the seller 
is aware of the issue but apparently would be happy to just stick someone with 
them.  The listing is for local pickup...  The odd thing is that if you contact 
the seller about the tubes, he will direct you to Craigslist in the Washington 
DC area and try to get you to go outside of ebay.  If you question anything, he 
will break off contact. 

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Re: [neonixie-l] Re: SARA the Executrix Slut!

['M W' via neonixie-l]

Nixie Porn: Allowed!Regular Porn: Not so much.(I tease one friend regularly 
about her "food porn", she's an amazing cook; I swear you could gain weight 
just looking at the pictures, though...)
Odd name but very nice looking :)

  Mark

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Re: [neonixie-l] Re: World's sketchiest Nixie tube power supply?

['M W' via neonixie-l]

Another option would be that Big Clive guy - He'd happily tear it down (and 
likely set it on fire) - Both are characters :)
  Mark
  From: SWISSNIXIE - Jonathan F. 
 To: neonixie-l  
 Sent: Tuesday, July 4, 2017 1:15 PM
 Subject: [neonixie-l] Re: World's sketchiest Nixie tube power supply?
   
This is one of the devices that should be bought and then sent to  Dave from 
the EEV-Blog.

Then he maybe could make a 2nd part of this 
https://www.youtube.com/watch?v=f14nv3uf2ik

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Re: [neonixie-l] Constant current source design

['M W' via neonixie-l]

That story reminds me of one from work. Not Nixie-related but sorta funny :)
Years ago, work had an IBM System/360 ot /370 of some age; It started having 
faults at random times, so they called in the tech. He opened the system 
covers, tied in all the diagnostics tools - logic analyzer, etc, but, zero 
faults happened over a couple days of his running those; So they pulled them 
out & closed the system up. Next day a few faults happened, so he was called 
back in, wired it up and ran it another week, no faults. He pulled the test 
gear & closed it up, but it crashed before he even made it to his car; He was 
called back in and of course once wired up, zero errors...
The light finally lit up on someone's brain in there (reports varied on whose!) 
- That the system cover doors, when OPEN, would preclude any errors, but when 
they were closed, errors would occur; So they looked at the wiring harnesses 
and found the harness that was flexing when the doors were closed, which had a 
nasty intermittent in there, that was only going open circuit VERY rarely, if 
quite enough to be horribly ANNOYING.
Systems Engineers types and so on, HATE intermittents, they're the bane of 
their existence :P LOL And they're quite annoying to debug, sometimes you can't 
figure out where the darned things are hiding at all.

  Mark

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Re: [neonixie-l] Capacitors in parallel why?

['M W' via neonixie-l]

Oh, also, I should mention heat; If the ripple current into/out of the caps is 
dissipating say 1.5 Watts (sometimes more, it depends on the project) and you 
divide that by 3 caps, they won't get nearly as hot as a single cap would get. 
Cooler electronics last longer, heat can cause problems for Caps especially.
  Mark

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Re: [neonixie-l] Capacitors in parallel why?

['M W' via neonixie-l]

On switchers you want the lowest ESR (Effective Series Resistance) between the 
power source (the switcher) and ground, so you bypass it to ground with low-ESR 
capacitors. Lots of good reasons; Sometimes the usual frequency (say 200 kHz or 
so, whatever your switcher's running at, frequency wise) of your switcher is 
just right for those particular capacitors, so using 3 in parallel will give 
you really GOOD results. Another is that sometimes cost for those caps is 
REALLY good this week, if you buy 10,000 or something. Or space in the project 
(sometimes 3 smaller caps FIT better on the PC board than 1 humongous cap.) 
And, also, what happens if one of the caps goes bad? If there were 3 caps and 
now just 2 work, probably it'll still work, if there was just 1, it quits 
working. Engineering is fun, but at times sorta a complex mess :)
  Mark
  From: Kerry Borgne 
 To: neonixie-l  
 Sent: Friday, February 19, 2016 2:51 PM
 Subject: [neonixie-l] Capacitors in parallel why?
   
 A question came up in one of my tech forums that I don't have a ready answer 
to.  

 The questions was in regards to switching supplies (used in LCD and Plasma 
Tv's) and the tech was asking why manufactures use three 1000uf35vdc caps in  

parallel instead of using one 3300uf@35vdc.  Other than perhaps a difference in 
cost I couldn't come up with an answer. There are other examples of the use of 
multiple caps in parallel instead of using one cap of equal value.  I've seen 
four or more. 


 Since I don't know a brighter, and more experienced group of guys than here on 
this forum, I thought I'd ask if anyone had an idea?
Kerry
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Re: [neonixie-l] Your message in neonixie-l was denied

['M W' via neonixie-l]

I did as well; I imagine many did, probably a misconfiguration or something 
somewhere. I'm not going to worry about it :)  Mark
  From: Instrument Resources of America iracosa...@hughes.net
 To: neonixie-l@googlegroups.com 
 Sent: Saturday, May 2, 2015 10:21 PM
 Subject: Re: [neonixie-l] Your message in neonixie-l was denied
   
 I got a similar/identical message, and thought it was strange, and wondered 
why.   Ira.

-snipped-  

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