[neonixie-l] Re: Constant current source design

[Tomasz Kowalczyk]

It all depends on R11 and desired current. Most nixies have a minimum 
voltage drop of around 120V (although they will maintain 130 for most of 
the time, they will just continue to work with lower voltage), so if 
voltage drop on R11 is more than (supply voltage - 120V - 
LM317_max_voltage), then it is safe - the only case where the nixie doesn't 
have that voltage drop is when it is internally shorted.
In this schematic, assuming that U15 is fully open, so voltage at R11 left 
side is just about 180V, everything will be okay - the LM317 is set for 
8mA, so voltage drop over R11 would be around 34V and everythin would be 
safe. The problem is that if current is significantly lower that (nixie is 
heavily poisoned), then stuff can get bad: as far as I understand, R11 
voltage drop has to be lower (Ohms law), so the voltage across LM317 will 
get higher, I think - it has to drop somewhere.
Long story short, you are right - LM317 can fail in non-standard situation. 
That's why I would go for a two-transistor design using MMBTA42 (or 
MPSA42), which will withstand almost anything. The only problem is power 
dissipation - 5mA with 50 volts drop across current limiting circuit is 
0,25W. With such constant current design one should lower HV voltage to 
minimum (just above striking point of all nixies), normally the 
significantly higher voltage (200V) is used to make choosing limiting 
resistor easier.

W dniu poniedziałek, 27 marca 2017 04:17:46 UTC+2 użytkownik gregebert 
napisał:
>
> I dont see anything fundamentally wrong; I just have paranoia about 
> running devices in an environment where this is potential for overvoltage. 
> The LM317 is rated for ~35V, and the HV supply is around 180V, so you are 
> relying on the voltage drop across the nixie tube. There are all kinds of 
> unexpected things that happen during power-up/down; maybe there are 
> scenarios that could damage the LM317.
>
>
>
>
>

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[neonixie-l] Re: Constant current source design

[gregebert]

I dont see anything fundamentally wrong; I just have paranoia about running 
devices in an environment where this is potential for overvoltage. The 
LM317 is rated for ~35V, and the HV supply is around 180V, so you are 
relying on the voltage drop across the nixie tube. There are all kinds of 
unexpected things that happen during power-up/down; maybe there are 
scenarios that could damage the LM317.




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[neonixie-l] Re: Constant current source design

[ZY]

I'd like some opinions on using something like a LM317 inline on the high 
side, as in the image attached. I've tested it and it seems to work 
although maybe there is a flaw that I'm not seeing somewhere.

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[neonixie-l] Re: Yahoo! group files section...

[Paul Andrews]

Works for me. Thanks for putting this up!

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[neonixie-l] Re: Yahoo! group files section...

[Nick]

The moderators should now be able to edit everything and create/delete in 
the tree as required.

Please check this.

Please be careful!

Nick

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[neonixie-l] Re: Yahoo! group files section...

[Nick]

OK,

The link is now 
https://drive.google.com/drive/folders/0BzH-L4OXjfbRYTRHU01jcDk1c3c?usp=sharing

This is a private-to-the-group Google Drive copy of the old Yahoo! Files 
section.

The TEMP folder should be r/w for the group (any abuse of it will be dealt 
with :)

Please check that the link works for you - the old link should now be dead.

Cheers

Nick

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Re: [neonixie-l] Radioactive Nixies - Study

[Jack Buechler]

Please could I have one PCB.

Could you get in touch please.


Jb
On Mar 16, 2017, at 7:22 PM, 'Dave' via neonixie-l 
mailto:neonixie-l@googlegroups.com>> wrote:



If anyone is interested, I have some extra PCBs for the open source uRADMonitor 
project.
It's an open source Geiger counter design based on an Arduino with a nice 
display and ethernet connectivity.
It is all through hole with the exception of one IC on the back of the board.

Here is the main info link:
uRADMonitor info

Here is a build link where the author shared a case design that I adopted:
uRadMonitor case info 
thread

My fork for the board is in GitHub and is listed in the above thread.
Mostly just cosmetic silkscreen enhancements.

The boards are only $8.  I also can share my version of the acrylic case that 
is shown in the thread.
I was able to successfully create an .svg file that you can get cut at ponoko.  
It custom fits my version of the board.

Here is a picture of the top and bottom of the board:





[https://lh3.googleusercontent.com/-HWaQWBAIIoM/WMqs5UPZl9I/AB4/6IWYkHCLQ5o5ZB5d8FpOl264ghdGJdhgwCLcB/s1600/uRADmonitor%2BPCB%2Bpicture.jpg]

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Re: [neonixie-l] Re: Yahoo! group files section...

['Grahame' via neonixie-l]

Nick

I can still see the file and I've done nothing to reinstate it.

How odd.

Grahame



Did you manage to add the file back?




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Re: [neonixie-l] Re: Yahoo! group files section...

[Nick]

On Sunday, 26 March 2017 13:28:10 UTC+4, Sgitheach wrote:
>
> Overly complex as you say. Anything else you want tried?
>

Thanks - all useful stuff. Still need to be sure of what Alex is seeing and 
I need lots of others to test this.

Did you manage to add the file back? 

BTW. We get about 15Gb of free storage this way. Using about 100Mb at the 
moment.

Cheers

Nick

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Re: [neonixie-l] Re: Yahoo! group files section...

['Grahame' via neonixie-l]

Hi Nick

Overly complex as you say. Anything else you want tried?

Grahame

On 26/03/2017 10:20, Nick wrote:

On Sunday, 26 March 2017 13:10:08 UTC+4, Sgitheach wrote:

I cannot upload anywhere accept TEMP. I appear to have been able
to remove IClist.txt in the Chip Data Sheet folder (as a test).
Remove appears non-greyed for all items it seems.

;^( Sorry


No problem - I have a copy saved :)

The odd thing is that IClist.txt is showing up for me with zero size, 
yet I can open and edit it !


I wonder if it just deletes "for you only"? Seems unlikely and overly 
complex.


Aha! From the Google Drive docs:


/If you delete a shared file that you don’t own:/

  o /o The file will be removed from your Drive , but other
collaborators can still access it./
  o /o To get the file back, open a link to the file and
then click *File and then Add to My Drive*./


Nick
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Re: [neonixie-l] Re: Yahoo! group files section...

[Nick]

On Sunday, 26 March 2017 13:10:08 UTC+4, Sgitheach wrote:
>
> I cannot upload anywhere accept TEMP. I appear to have been able to remove 
> IClist.txt in the Chip Data Sheet folder (as a test). Remove appears 
> non-greyed for all items it seems.
>
> ;^( Sorry
>

No problem - I have a copy saved :)

The odd thing is that IClist.txt is showing up for me with zero size, yet I 
can open and edit it !

I wonder if it just deletes "for you only"? Seems unlikely and overly 
complex. 

Aha! From the Google Drive docs:


*If you delete a shared file that you don’t own:*


   - *o The file will be removed from your Drive , but other collaborators 
  can still access it.*
  - *o To get the file back, open a link to the file [image: and 
  then] click File [image: and then] Add to My Drive.*
   

Nick

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Re: [neonixie-l] Re: Yahoo! group files section...

['Grahame' via neonixie-l]

I cannot upload anywhere accept TEMP. I appear to have been able to 
remove IClist.txt in the Chip Data Sheet folder (as a test). Remove 
appears non-greyed for all items it seems.


;^( Sorry

Grahame


On 26/03/2017 10:05, Nick wrote:

That's where you should end up.

Need to work out why there was a difference with Alex - he joined 
neonixie-l with a gmail account and if he's using that one then he 
should have had the same experience as you,


Could you edit files anywhere else apart from TEMP?

Thanks

Nick
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Re: [neonixie-l] Re: Yahoo! group files section...

[Nick]

That's where you should end up.

Need to work out why there was a difference with Alex - he joined 
neonixie-l with a gmail account and if he's using that one then he should 
have had the same experience as you,

Could you edit files anywhere else apart from TEMP?

Thanks

Nick

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[neonixie-l] Re: Yahoo! group files section...

[Nick]

The way that Google have set this up is that you share a folder with the 
group, i.e. neonixie-l@googlegroups.com

Thus, theoretically, anyone who is a member of that group has access, so if 
you're logged in to Google with the username that you used when registering 
with neonixie-l, you should have access to the share.

Nick

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[neonixie-l] Re: Yahoo! group files section...

[Alex]

Hi Nick,

You link tries to take me to Google Domain / Company Admin console - which 
fails with my gmail account active and works when my corp domain account is 
active (but to my admin panel...)

Cheers,
- Alex

On Sunday, 26 March 2017 08:56:49 UTC+1, Nick wrote:
>
> OK.
>
> I've downloaded all the files from the Yahoo group and have placed them on 
> Google Drive, currently read-only.
>
> Can some members please try the following link to see if they can see the 
> files please: 
> https://drive.google.com/drive/folders/0B93DAeV7sPGsT2RhQ0pHbVNMd3c?usp=sharing
>  
>
> That should be read-only access - you should not be able to create. Tricky 
> for me to test as obviously I have full access.
>
> If that works, then I'll create a shared writable "upload" directory and 
> will be asking for volunteers to manage the library...
>
> Can you report experiences/make comments ON THIS THREAD ONLY.
>
> Cheers
>
> Nick
>

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Re: [neonixie-l] Re: Yahoo! group files section...

['Grahame' via neonixie-l]

Good morning Nick!

Seems to work ok, I can navigate around. I have uploaded a file to the 
TEMP folder, removed it and then added another so it looks ok


https://drive.google.com/open?id=0B-9AAEcPPZS3eTFad2VnWkxuTjg

Grahame


On 26/03/2017 09:04, Nick wrote:

...the TEMP folder should be writable by group members.

If this works, I'll set up a specific Google Drive account for the 
group rather than use a subdirectory of my own drive.

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[neonixie-l] Re: Nixie Horizonte

[Nick]

Very cool watches indeed - do you sell them?

Cheers

Nick

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[neonixie-l] Re: Yahoo! group files section...

[Nick]

...the TEMP folder should be writable by group members.

If this works, I'll set up a specific Google Drive account for the group 
rather than use a subdirectory of my own drive.

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[neonixie-l] Yahoo! group files section...

[Nick]

OK.

I've downloaded all the files from the Yahoo group and have placed them on 
Google Drive, currently read-only.

Can some members please try the following link to see if they can see the 
files please: 
https://drive.google.com/drive/folders/0B93DAeV7sPGsT2RhQ0pHbVNMd3c?usp=sharing
 

That should be read-only access - you should not be able to create. Tricky 
for me to test as obviously I have full access.

If that works, then I'll create a shared writable "upload" directory and 
will be asking for volunteers to manage the library...

Can you report experiences/make comments ON THIS THREAD ONLY.

Cheers

Nick

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[neonixie-l] Re: Constant current source design

[gregebert]

Some other things I forgot to mention...

1. Generally, you would use a current-regulator on the anode side for 
non-segmented tubes (0-9), where all cathodes use the same current.

2. Segmented displays (b7971) have different currents for various segments, 
so you will need cathode-side current-regulation. I chose to include an 
anode-side current-limiter as well because the Burroughs datasheet 
specifies a max total current. This max current is about half the sum of 
all the spec'd individual segment currents.

3. If you use MOS devices, be very careful not to exceed the max-voltage 
specs. Doing so will damage the device (impaired reliability, or outright 
destruction). I've done some research on MOS device-failures and they often 
fail-shorted, which is disastrous. Fortunately, those kinds of failures are 
mostly caused by overstress (voltage or temp).

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