RE: [neonixie-l] Re: IN18 Blue Dream out-of-production until 2019

[Alic]

Sorry, I only have the one for the Black'n'Wood, which is similar.
I would have to ask for Dieter's permission to share it anyway, so why not ask 
him directly if he is willing to share the schematics here?

Also, since the design is direct drive with all discreet components, it isn't 
that hard to understand just from looking at the board.
Except maybe the power supply.

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[neonixie-l] Re: Constant current source design

[gregebert]

That's basically what I use in my designs. I'll highlight the differences:

   - I use a PMOS instead of PNP, mainly because it requires no 
   drive-current.
   - R1 & R2 are replaced with a pot to make the current adjustable.
   - The above pot can driven from a small DC-DC converter (my preference), 
   or between the HV supply & GND. There's essentially zero current for PMOS 
   gate-drive, so high resistance values are fine. Not the case with PNP, 
   though, due to finite base-currrent.
   - A zener diode is added to clamp any spikes that may arise at the gate 
   of the PMOS device. It's a paranoia item.
   - A filter cap was added, in case there is unexpected noise from the DC 
   DC converter, and also to suppress any very-short transient that may arise 
   that are too fast for the zener to kick-in. (paranoia item).
   - A large resistor across the PMOS to bleed any potential ESD. Without 
   it, there is a remote possibility of charge-buildup. (paranoia item)

So, this circuit is replicated for each anode. When multiple anodes are 
driven, they all share the same gate-drive signal, which I call PDRV on the 
attached schematic.


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RE: [neonixie-l] Re: IN18 Blue Dream out-of-production until 2019

[Piano Forte]

Alic, did you have any luck finding the Blue Dream schematic?

Thanks 

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RE: [neonixie-l] Re: IN18 Blue Dream out-of-production until 2019

[Piano Forte]

Please let us know if you had any luck finding the Blue Dream schematic. 

Thanks 

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[neonixie-l] Re: Constant current source design

[Laurence Wilkins]

>
> Yes, I agree with Tomasz, the first circuit shown in the article he links 
> to is the way to do it. Advantages: No "wasted" current draw, cheap and 
> easy.  Ignore the comments in that article about the problems of voltage 
> drop - that might be important when you've only got 5V to play with, but 
> with 200V on tap... !!
>

Suggest RSense of 120 Ohms should regulate the current to 5mA, then make R1 
anywhere between 100K and 220K. Not critical.  Use a high voltage MPSA42 
transistor or similar for T1, T2 can be any old jelly bean type. 

While this constant current source will be inherrently short-circuit proof 
(the most current that will ever flow will be 5mA), be aware that under 
those conditions a humble MPSA42 will be dropping 1 Watt and will fry 
pretty quickly! Something a little beefier in the power stakes might then 
be a better choise.

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[neonixie-l] Re: Constant current source design

[Tomasz Kowalczyk]

I would recommend using design like first one from link below: I haven't 
tested it myself, but it looks like it loses less power (doesn't have any 
resistors going from 200V to GND), and the mentioned minimum voltage drop 
on it will be not noticable in nixie application. It is not really a 
current source, but a current limiter, but again - it should do it's job. 
It uses one more transistor, but I think that with MMBTA42 or MPSA42 prices 
it shouldn't matter much.
http://electronicdesign.com/power/current-limiter-offers-circuit-protection-low-voltage-drop

W dniu sobota, 25 marca 2017 04:26:32 UTC+1 użytkownik Paul Andrews napisał:
>
> I wanted to start a discussion about constant current sources (as opposed 
> to sinks, because I want to provide a constant current to the anode 
> regardless of which cathode is pulled to ground). I've found many articles 
> on the web. Some for Nixie constant current sinks, some for LED constant 
> current sources, some more theoretical, some very simple, some very 
> complex. But no constant current *sources *for Nixies - i.e. designs for 
> a constant current source that include actual part numbers and component 
> values. I wanted to start simple, to make sure I have at least some grasp 
> of this topic, so here is my first stab. I would be grateful if anyone 
> could let me know if it would work as is or if I have made some fundamental 
> errors - ignoring improvements such as temperature stability for now (BTW 
> R3 is Re in the equations).
>
> Be gentle - this is all new to me!
>
>
> 
>
>

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Re: [neonixie-l] Lixies/Tixie Clock

[JohnK]

Actually no idea how far "they" got relocating the files and photos from the 
old Yahoo Group. The intro to this group doesn't tell much.
https://groups.google.com/forum/#!forum/neonixie-l

I see stuff like this on the web, but it doesn't seem to match even though they 
purport to be discussing Google and not Yahoo.. "Every group comes with 100 MB 
of storage space to store all of your group's photos, documents, and more. You 
can view the amount of storage space your group is using by clicking on the 
"Files (Default)" link on the right side of your group's homepage. The amount 
of storage space currently being used is indicated at the bottom of the Files 
page."

If you look back at the early days of this Google Group, no doubt Nick spells 
it out. I seem to remember discussions about having to 'link' various Google 
products together to get the 'old' Yahoo functionality.

BUT, the good news

I mentioned the Yahoo days when I posted on 23 Feb about the military use [and 
I still need some pictures].
If you go there you will see photo and file areas. There is a lot of stuff 
stored by the Yahoo Group guys.
https://groups.yahoo.com/neo/groups/NEONIXIE-L/info


John K.


  - Original Message - 
  From: Paul Andrews 
  To: neonixie-l 
  Sent: Saturday, March 25, 2017 2:04 PM
  Subject: Re: [neonixie-l] Lixies/Tixie Clock


  What files/photos section? i.e. How do we access that?

  On Friday, March 24, 2017 at 5:07:36 AM UTC-4, johnk wrote:
Some of you might like what you see in the files/photos section of this 
Google Group or the old Yahoo Group - pics of non-nixie displays and lots of 
interesting stuff.

John K

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<>

[neonixie-l] NEW FIRMWARE: nwts 2.1-beta

[Manuel Azevedo]

Hello!

I'm glad to announce that I'm releasing today the new 2.1-beta version of 
*nwts* firmware.

*nwts* allows your GPS enabled clock to be synchronized using NTP via Wi-Fi 
networks.

New features include:

Changelog v2.1-20170324 
   
   - Added time zone and DST support
   - Custom latitude and longitude. Selected browsers can auto-fill
   - Select which NMEA messages to send and send only when clock RTC is in 
   sync
   - Select date format in Webpage
   - Adjust delay or advance of time with drift correction
   - Various corrections and improvements

I've created the following thread in the TubeClockDB for support of this 
beta version. Here you can find also the firmware files, documentation and 
important information:


https://www.tubeclockdb.com/component/kunena/4-builders-forum/7340-nwts-2-1-beta-time-zone-and-dst-support-tester-discussion.html


You can also buy *n**wts* at:



   - https://www.tindie.com/stores/Mazevedo/


   - http://www.ebay.ie/itm/172500878154


Screenshots























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