Re: [neonixie-l] Any good guides to building boost converters?

[gregebert]

Someone mentioned coilcraft as a supplier in another thread. I'll give that 
a +1. Good selection on their website, some design tools, and they 
direct-sell in single-unit quantity.

Make sure you have a good scope, and NEVER use the ground-clip from your 
probe. Instead, tie directly to the metal-shroud next to the probe tip. 
It's the only way to get clean signals.

I confess I did not use a good closed-loop control system on my converter; 
all it does is shut-down when the voltage gets above +180, then back on at 
+160 or below. 

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Re: [neonixie-l] Super quiet nixie PSU

[John Rehwinkel]

> I'm in the same boat, so if you find a source please let me know!
> 
>> I'm also looking for this for the same reasons.
>> Unfortunately I don't have the knowledge to design the board on my own.
>> Does anyone have something he is willing to share or sell, such as eagle 
>> files or a finished board or anything in between?
>> Or is there a finished product or product line out there that would work in 
>> this situation?

The Tayloredge supply is quite well behaved as well as robust, inexpensive, 
small, and already available.

However, Nick, Grahame, and I are toying with the idea of implementing 
something like the supply in that application note.  The core of it (a Royer 
oscillator and matching step-up transformer) is basically an ordinary CCFL 
supply, so I built my initial versions around surplus CCFL supplies I picked up 
on the cheap.

http://www.vitriol.com/images/tech/crtbreadboard.jpg 


The tricky part is the transformer, and the ones mentioned in the app note 
don't appear to be off-the-shelf parts, but a few phone calls to Coiltronics, 
Coilcraft, or Pico might yield information.  Grahame and I have also worked 
with Custom Coils before for custom transformers, they're good to work with for 
hobbyist quantities.

- John

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Re: [neonixie-l] Super quiet nixie PSU

[Jonathan Peakall]

I'm in the same boat, so if you find a source please let me know!

On 3/14/2017 3:50 PM, Alic wrote:

Hi,
I'm also looking for this for the same reasons.
Unfortunately I don't have the knowledge to design the board on my own.
Does anyone have something he is willing to share or sell, such as eagle files 
or a finished board or anything in between?
Or is there a finished product or product line out there that would work in 
this situation?

Thanks for your help.



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Re: [neonixie-l] Super quiet nixie PSU

[Jonathan Peakall]

Thanks! I'll see if maybe they have a reasonably priced demo board. I 
suspect perfect layout is needed to achieve the low noise figures and 
that is beyond me.



On 3/14/2017 9:18 AM, 'Grahame' via neonixie-l wrote:

Try this, both clean supply and low EMI

http://cds.linear.com/docs/en/application-neyote/AN118fb.pdf

I've been trialling designs from it for a while and it does what it 
says on the tin ;-)


Grahame



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[neonixie-l] Super quiet nixie PSU

[Alic]

Hi,
I'm also looking for this for the same reasons.
Unfortunately I don't have the knowledge to design the board on my own.
Does anyone have something he is willing to share or sell, such as eagle files 
or a finished board or anything in between?
Or is there a finished product or product line out there that would work in 
this situation?

Thanks for your help.

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RE: [neonixie-l] Radioactive Nixies - Study

[Tidak Ada]

The radiation hazard is comparable or less that the hazard of a concrete or 
natural stone wall in your house. however the wall is more less healthy, 
because Radon is an alpha radiating gas that you inhale in your lungs

Anyhow, an hour in an airplane at 10,000 ft gives a considerable higher dose.

eric

-Oorspronkelijk bericht-
Van: neonixie-l@googlegroups.com [mailto:neonixie-l@googlegroups.com] Namens 
NeonJohn
Verzonden: dinsdag 14 maart 2017 23:38
Aan: neonixie-l@googlegroups.com
Onderwerp: Re: [neonixie-l] Radioactive Nixies - Study



On 03/14/2017 02:01 PM, gregebert wrote:
> Anyone know how the radiation "hazard" of nixies compares to Xrays 
> produced by color televisions/computer monitors that used CRTs ?
> 

None vs none.  As soon as the low level X-rays from TV sets were discovered and 
became and issue (two different events), several things happened

1) All new CRTs had their faceplates made out of leaded glass.
2) the damper tube was made from leaded glass*
3) hard high voltage limiting was instituted.

* A properly made damper tube would not generate X-rays regardless of the 
voltage applied.  The plate cylinder had to be a little bit out of 
concentricity with the filament to produce X-rays.

There was an Amateur Scientist article about how to use a damper tube and a 
home-made Odin coil to make an X-ray source.  Several fuzzy X-rays were 
published.

I made the Odin coil but I could not get any X-rays.  My tube was in good 
alignment.  It took prowling through the inventory of the two TV repair shops 
that tolerated this nerdy kid before I found one that worked.

The results were still lousy because the X-rays emanated from all over the 
anode's surface.  The optical equivalent is trying to take a shadowgraph photo 
of an object using and extremely point source LED vs using light from a 
recessed fluorescent fixture.  Real X-ray tubes use several tricks to make as 
close to a point source as possible.

Anyway, back to CRTs.  I have a Victoreen survey meter designed specifically 
for the CRT industry.  It uses an ion chamber with a super-thin mylar window 
and is calibrated microR/Hr.  I have never detected anything above background 
from any of the TVs or CRT monitors I've owned.

John



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Re: [neonixie-l] Radioactive Nixies - Study

[NeonJohn]

On 03/14/2017 02:01 PM, gregebert wrote:
> Anyone know how the radiation "hazard" of nixies compares to Xrays produced 
> by color televisions/computer monitors that used CRTs ?
> 

None vs none.  As soon as the low level X-rays from TV sets were
discovered and became and issue (two different events), several things
happened

1) All new CRTs had their faceplates made out of leaded glass.
2) the damper tube was made from leaded glass*
3) hard high voltage limiting was instituted.

* A properly made damper tube would not generate X-rays regardless of
the voltage applied.  The plate cylinder had to be a little bit out of
concentricity with the filament to produce X-rays.

There was an Amateur Scientist article about how to use a damper tube
and a home-made Odin coil to make an X-ray source.  Several fuzzy X-rays
were published.

I made the Odin coil but I could not get any X-rays.  My tube was in
good alignment.  It took prowling through the inventory of the two TV
repair shops that tolerated this nerdy kid before I found one that worked.

The results were still lousy because the X-rays emanated from all over
the anode's surface.  The optical equivalent is trying to take a
shadowgraph photo of an object using and extremely point source LED vs
using light from a recessed fluorescent fixture.  Real X-ray tubes use
several tricks to make as close to a point source as possible.

Anyway, back to CRTs.  I have a Victoreen survey meter designed
specifically for the CRT industry.  It uses an ion chamber with a
super-thin mylar window and is calibrated microR/Hr.  I have never
detected anything above background from any of the TVs or CRT monitors
I've owned.

John



-- 
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Tellico Plains, Occupied TN
http://www.tnduction.com<-- THE source for induction heaters
http://www.neon-john.com<-- email from here
http://www.johndearmond.com <-- Best damned Blog on the net
PGP key: wwwkeys.pgp.net: BCB68D77

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Re: [neonixie-l] Radioactive Nixies - Study

[GastonP]

IIRC, correctly calibrated CRT television sets and computer monitors did 
not emit X-ray at all. Nor any other kind of harmful radiation, for what is 
worth.
The warnings were related to the operation of the HV rectifier (in times of 
the vacuum ones, 1B3 and the like) way off its HV maximum limits.

On Tuesday, March 14, 2017 at 3:01:20 PM UTC-3, gregebert wrote:
>
> Anyone know how the radiation "hazard" of nixies compares to Xrays 
> produced by color televisions/computer monitors that used CRTs ?
>

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Re: [neonixie-l] Any good guides to building boost converters?

[John Rehwinkel]

> I assume this is for a nixie supply; what you probably want is a flyback 
> converter; instead of a single inductor, there is a transformer. The 
> operation is similar.

While transformers are nice (you really have to push the duty cycle for an 
inductor-based converter for a large step-up ratio), they're more complex to 
specify and find as off the shelf parts.

> Simulations will help somewhat, but what I've found is that modeling of 
> non-ideal transformers (aka, coupled inductors) is not only tricky, but also 
> prone to error. Too often, converters will work beautifully at low-loads, 
> then fall to pieces at higher loads (yes, even significantly below the 
> intended max-load). Make sure you stay clear of the saturation current 
> (Isat), otherwise you will get significant heating (energy loss).

Quite true.  I usually breadboard things and try to understand how a circuit is 
intended to work, and how it actually works (sometimes these differ).  There's 
a DIY Geiger counter kit out there with a fairly creative power supply to 
generate the hundreds of volts for the Geiger tube.  A friend and I learned a 
lot debugging the thing.

> I just pulled up this tutorial; I have not read it entirely but it's the 
> most-detailed tutorial I've found. I wish I had this when I was designing my 
> nixie watch.
> 
> http://www.power-eetimes.com/content/step-step-optimised-flyback-design 
> 

Cool, thanks for the link, I think several of us will benefit from it!

- John

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Re: [neonixie-l] Radioactive Nixies - Study

[franetic]

Those ZM1000's were made in a year ending in 6 and/or 7 according to the 
date code. I'm guessing 1976/77. 

On Tuesday, March 14, 2017 at 5:59:46 PM UTC+1, David Speck wrote:
>
> They are labeled as 3H, for tritium, so they would have a 12 year half 
> life.  Any idea how old they are?
>
> Dave
>
> On 3/14/2017 12:03 PM, franetic wrote:
>
> Just as a curiosity, I have (I had) some boxed ZM1000 nixies branded by 
> RTC (France). See attached photos. The box has a label warning about 
> radioactivity! It probably presents no real danger even if the tube gets 
> broken. (Unless you break a large quantity of those and make sure you 
> inhale the gas.) Note that these are no different that your regular 
> ZM1000's, they were made at the Philips Heerlen factory. (As was every 
> ZM1000 I have had handled.)
>
>
>

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Re: [neonixie-l] Radioactive Nixies - Study

[Paul Andrews]

My wife sends us this link: http://thedollop.net/wp/episode-20-dollop/ about 
David Hahn. I think she means it as a cautionary tale!

> On Mar 14, 2017, at 2:01 PM, gregebert  wrote:
> 
> Anyone know how the radiation "hazard" of nixies compares to Xrays produced 
> by color televisions/computer monitors that used CRTs ?
> -- 
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Re: [neonixie-l] Radioactive Nixies - Study

[gregebert]

Anyone know how the radiation "hazard" of nixies compares to Xrays produced 
by color televisions/computer monitors that used CRTs ?

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Re: [neonixie-l] Super quiet nixie PSU

[Nick]

On Tuesday, 14 March 2017 20:18:21 UTC+4, Sgitheach wrote:
>
> http://cds.linear.com/docs/en/application-note/AN118fb.pdf 
>

This was always going to be a good design - did you note who wrote the AN?

The late, great, Jim Williams.

Nick 

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RE: [neonixie-l] Radioactive Nixies - Study

[SWISSNIXIE - Jonathan F.]

That kit doesn't look too bad, but 55$ for a Geiger Counter without a display?


For 39$ without a gm tube you could get this one

https://sites.google.com/site/diygeigercounter/buy-the-kit-1

Many tubes are supported, gm-tubes (SbM-20 is a good choice) on ebay. 


And...for "just experimenting" you can build your own counter on a breadboard 
:) only a inductor and a few other things are neccesarry

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RE: [neonixie-l] Radioactive Nixies - Study

[judge2005]

What is your opinion of this one: 
http://www.ebay.com/itm/Open-source-Geiger-counter-kit-nuclear-radiation-GM-detector-tube-radiation-/161447070168?hash=item2596fec9d8:g:gFMAAOSwcu5UN4Pk

From: John Rehwinkel
Sent: Tuesday, March 14, 2017 12:01 PM
To: neonixie-l@googlegroups.com
Subject: Re: [neonixie-l] Radioactive Nixies - Study

So how should I do to properly test all old instruments and tubes that I buy to 
check that they are safe, free from harmful radiation, is there any reliable 
equipment that don't cost an arm and a leg that I can use at home?

The BWP34 ones mentioned before are probably the most cost effective.  Here's 
Elektor's version:

https://www.element14.com/community/servlet/JiveServlet/previewBody/41953-102-1-229709/Elektor%20Radiation%20Meter.pdf

Maxim describes a fairly reasonable one here:

http://pdfserv.maximintegrated.com/en/an/AN2236.pdf

If you want to use an actual GM tube, there are kits available, like this open 
source one ($40 and up):

https://sites.google.com/site/diygeigercounter/buy-the-kit-1

Or this commercial offering ($30):

http://www.goldmine-elec-products.com/prodinfo.asp?number=C8600

For those, you'll have to source the tubes separately, or buy (more expensive) 
options including tubes.

None of these options will give you lab-grade accuracy, but are completely fine 
for checking things to see if they're radioactive or not.  For the curious, my 
go-to Geiger counter is the Black Cat Systems GM-45, with a very sensitive 
"pancake" style GM tube, but that thing is more expensive at $349.

- John

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[neonixie-l] Re: Radioactive Nixies - Study

[SWISSNIXIE - Jonathan F.]

There is no danger about them tubes! Even a few cm away you cant detect the 
radiation anymore.

8 of the 5092a could not produce a visible gamma spectrometry peak on my 
professional detector.

For comparison, a 6141 Voltage Regulator Tube does produce a relative big peak.


About tubes from RUS/UKR, the chance you get tubes from chernobyl is very 
small. It seems the soviet produced large amounts of all kind of stuff, just 
browse ebay... capacitors,tubes,resistors,geiger tubes All can be found in 
large amounts.  Chernobyl is still a military controlled zone, you would not 
get out there with truckloads of stuff. I guess there are abandodoned factories 
and storages all over russia where people take materials away. Back to 
radiation: The soviets even have abandoned nuclear heat generators (RTGs) in 
lighthouses and military bases, and those things have very dangerous sources in 
them.

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Re: [neonixie-l] Radioactive Nixies - Study

[David Speck MD]

They are labeled as 3H, for tritium, so they would have a 12 year half 
life.  Any idea how old they are?


Dave


On 3/14/2017 12:03 PM, franetic wrote:


Just as a curiosity, I have (I had) some boxed ZM1000 nixies branded 
by RTC (France). See attached photos. The box has a label warning 
about radioactivity! It probably presents no real danger even if the 
tube gets broken. (Unless you break a large quantity of those and make 
sure you inhale the gas.) Note that these are no different that your 
regular ZM1000's, they were made at the Philips Heerlen factory. (As 
was every ZM1000 I have had handled.)




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[neonixie-l] Re: Radioactive Nixies - Study

[GastonP]

Well, the first thing I did when I built my Geiger counter was to go 
through all of my ex-USSR sourced stuff. Just in case, you know :).
Nothing hot in there so far.

On Tuesday, March 14, 2017 at 3:22:03 AM UTC-3, Terry Kennedy wrote:
>
> On Sunday, March 12, 2017 at 11:17:31 PM UTC-4, Paul Andrews wrote:
>>
>> I have often wondered about taking a geiger counter to my tubes. Call me 
>> paranoid, but I wonder where some of the NOS tubes come from precisely.
>>
>
> Some years ago I bought an Elektronika 7-06K from an eBay seller in 
> Ukraine. It was full of the most noxious dust I could imagine - like finely 
> pulverized concrete, but very acrid. I asked the seller where he got the 
> clock, and he said "A disused industrial premise approximately 100km NNW of 
> Kiev". I don't know if he was kidding or not, but Chernobyl definitely had 
> some 7-06K's: 
> http://newsinphoto.ru/wp-content/uploads/2011/04/chernocY-960x667.jpg
>

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[neonixie-l] Re: Any good guides to building boost converters?

[gregebert]

My $0.02 here

I assume this is for a nixie supply; what you probably want is a flyback 
converter; instead of a single inductor, there is a transformer. The 
operation is similar.

Simulations will help somewhat, but what I've found is that modeling of 
non-ideal transformers (aka, coupled inductors) is not only tricky, but 
also prone to error. Too often, converters will work beautifully at 
low-loads, then fall to pieces at higher loads (yes, even significantly 
below the intended max-load). Make sure you stay clear of the saturation 
current (Isat), otherwise you will get significant heating (energy loss). 

I just pulled up this tutorial; I have not read it entirely but it's the 
most-detailed tutorial I've found. I wish I had this when I was designing 
my nixie watch.

http://www.power-eetimes.com/content/step-step-optimised-flyback-design

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Re: [neonixie-l] A new old NixiSat about to be built!

[Luca Bertagnolio]

Thanks for your welcome John!

I'm not familiar with that kit in particular, but I'd advise replacing any 
electrolytic capacitors with fresh ones.
makes sense to me. I have an open order with Mouser and I will include all the 
required electrolytic capacitors to swap the old ones in the kit. Good advice.

Most of those are pretty straightforward and just directly shut down the HV 
supply when needed, without the need for any software modification.
got a project already and hopefully a PCB soon too!

73 de Luca HB9FGJ


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Re: [neonixie-l] A new old NixiSat about to be built!

[Luca Bertagnolio]

Thanks Paul, that one is a page I had not seen yet, with some good information 
on.

Bye, Luca

On 14 March 2017 at 13:22:23, Paul Andrews (p...@nixies.us) wrote:

Does this help (not sure it is the same thing, but it might help you get in 
touch with the right people): 
http://www.azevedo-devices.com/blog/nwts-syncing-a-jeff-thomas-gpsii-clock 

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Re: [neonixie-l] Super quiet nixie PSU

['Grahame' via neonixie-l]

Try this, both clean supply and low EMI

http://cds.linear.com/docs/en/application-note/AN118fb.pdf

I've been trialling designs from it for a while and it does what it says 
on the tin ;-)


Grahame


On 14/03/2017 16:00, Jonathan Peakall wrote:

Hi All,

Finally working on my fantasy radio, with nixies for frequency display 
of course! And IN-9 or 13 for the S meter, eye tubes for forward and 
reflected power and so on.


What I need is a super quiet DC to DC power supply for the display. I 
can stuff it in a separate box if need be but would like to put it in 
the same enclosure as the transceiver. Any recommendations?




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[neonixie-l] checking for radiation Radioactive Nixies - Study

[alb.001 alb.001]

 
  Electronic Goldmine has lots of Geiger Counter kits and G-M tubes for sale,  Join their e-mail list and you get notification of new products and sales - at least monthly you will find a deal on radiation detecting kits or parts.
  I have no relation to the company just a regular user.
  Phil
  
   -- Original Message --
   From: Dekatron42 
   Date: March 14, 2017 at 9:14 AM
   
   
   
So how should I do to properly test all old instruments and tubes that I buy to check that they are safe, free from harmful radiation, is there any reliable equipment that don't cost an arm and a leg that I can use at home?

 


 I'm not particularly afraid but if there is an easy way to check then it might be a good idea.
 
 
  
 
 
  /Martin
 

   
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Re: [neonixie-l] Radioactive Nixies - Study

[John Rehwinkel]

> So how should I do to properly test all old instruments and tubes that I buy 
> to check that they are safe, free from harmful radiation, is there any 
> reliable equipment that don't cost an arm and a leg that I can use at home?

The BWP34 ones mentioned before are probably the most cost effective.  Here's 
Elektor's version:

https://www.element14.com/community/servlet/JiveServlet/previewBody/41953-102-1-229709/Elektor%20Radiation%20Meter.pdf
 


Maxim describes a fairly reasonable one here:

http://pdfserv.maximintegrated.com/en/an/AN2236.pdf 


If you want to use an actual GM tube, there are kits available, like this open 
source one ($40 and up):

https://sites.google.com/site/diygeigercounter/buy-the-kit-1 


Or this commercial offering ($30):

http://www.goldmine-elec-products.com/prodinfo.asp?number=C8600

For those, you'll have to source the tubes separately, or buy (more expensive) 
options including tubes.

None of these options will give you lab-grade accuracy, but are completely fine 
for checking things to see if they're radioactive or not.  For the curious, my 
go-to Geiger counter is the Black Cat Systems GM-45, with a very sensitive 
"pancake" style GM tube, but that thing is more expensive at $349.

- John

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[neonixie-l] Super quiet nixie PSU

[Jonathan Peakall]

Hi All,

Finally working on my fantasy radio, with nixies for frequency display 
of course! And IN-9 or 13 for the S meter, eye tubes for forward and 
reflected power and so on.


What I need is a super quiet DC to DC power supply for the display. I 
can stuff it in a separate box if need be but would like to put it in 
the same enclosure as the transceiver. Any recommendations?


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Re: [neonixie-l] Radioactive Nixies - Study

[robin bussell]

On 14/03/2017 13:14, Dekatron42 wrote:

So how should I do to properly test all old instruments and tubes that I
buy to check that they are safe, free from harmful radiation, is there
any reliable equipment that don't cost an arm and a leg that I can use
at home?


If you have a place that can develop it then maybe photographic film?
Or this stuff: 
https://uk.impossible-project.com/collections/film-for-polaroid-600-cameras


Though as to the practical details of how to expose and for how long I 
have no idea!



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Re: [neonixie-l] Any good (simple) guides to building puck converters?

[John Rehwinkel]

> I need to wait until the coffee takes effect. I mean boost converters! Can I 
> change the title?

I don't know of a way to change a title in something that's already been sent 
out, alas.

I was wondering what you meant, my (wrong) guess was that you wanted a GPS 
"puck" that retransmitted timing info via bluetooth/UHF/whatever.

> I've come to the conclusion that I need to be able to build my own puck 
> converters, at least so I can understand what I am looking at when I look at 
> schematics for other people's converters! I could do with something that 
> takes me from a simple example up to more complex examples that fix issues 
> with the simple one.

There are lots of resources out there.  Here's one:

http://www.coilgun.eclipse.co.uk/electromagnetic_pistol_voltage_converter_design.html
 


I'll point out one of those details that tends to catch people off guard when 
they first notice it, but seems "obvious" in retrospect.  If a boost converter 
is supplied with power, but the converter itself isn't running, you'll see the 
input voltage at the output (it flows through the coil and diode).

- John

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[neonixie-l] Any good guides to building boost converters?

[Paul Andrews]

Hi,

I have decided that I need to actually understand the details of boost 
converter design, rather than just the principles (you know, back-emf and 
all that). It would be helpful to have a course that takes me through a 
basic implementation and then addresses issues such as efficiency, input 
protection, output protection etc. Does anyone have any suggestions?

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[neonixie-l] Re: Any good (simple) guides to building puck converters?

[Paul Andrews]

I need to wait until the coffee takes effect. I mean boost converters! Can 
I change the title?

On Tuesday, March 14, 2017 at 8:35:02 AM UTC-4, Paul Andrews wrote:
>
> I've come to the conclusion that I need to be able to build my own puck 
> converters, at least so I can understand what I am looking at when I look 
> at schematics for other people's converters! I could do with something that 
> takes me from a simple example up to more complex examples that fix issues 
> with the simple one. I had seen online something similar for current 
> mirrors (I'll try and dig a link up later, I'm on the wrong device ATM). 
> Any suggestions?

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Re: [neonixie-l] Re: Radioactive Nixies - Study

[NeonJohn]

On 03/14/2017 05:05 AM, Luca Bertagnolio wrote:

>  Welcome to the fascinating world of radiation, known by little and
> feared by most, for no good reason. More people have been killed by
> fear of radiation than by radiation itself.

This is literally true.  Several people were killed fleeing Three Mile
Island when the accident was wholly contained on-side and no off-site
radiation was measured.

John


-- 
John DeArmond
Tellico Plains, Occupied TN
http://www.tnduction.com<-- THE source for induction heaters
http://www.neon-john.com<-- email from here
http://www.johndearmond.com <-- Best damned Blog on the net
PGP key: wwwkeys.pgp.net: BCB68D77

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[neonixie-l] Re: question about threeneurons clock kit

[Tomas Begley]

ok sounds fair enough you may be getting an order soon ;)

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Re: [neonixie-l] Radioactive Nixies - Study

[H. Carl Ott]

On Tue, Mar 14, 2017 at 8:52 AM, John Rehwinkel  wrote:

>  We declined, but I assume some gear like that surfaces at equipment
> auctions occasionally.  Maybe I should bring my counter to hamfests?
>



I always bring a pocket geiger counter to the hamfests I attend.
 So far It's mostly been radium dialed military meters and some odd pieces
of fiestaware .

  But lots of vintage electronics did incorporate radioactive emitters,  so
you never know.
  Some of the meters were actually pretty "hot".


carl

Henry Carl Ott   N2RVQhcarl...@gmail.com

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Re: [neonixie-l] Radioactive Nixies - Study

[Dekatron42]

So how should I do to properly test all old instruments and tubes that I 
buy to check that they are safe, free from harmful radiation, is there any 
reliable equipment that don't cost an arm and a leg that I can use at home?

I'm not particularly afraid but if there is an easy way to check then it 
might be a good idea.

/Martin

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Re: [neonixie-l] Radioactive Nixies - Study

[JohnK]

There are persistant reports here that some equipment buried at Maralinga 
[British A-bomb tests] found its way to the surplus market [ie Waltham Trading 
in Rundle Street, for those who are local. When I was at school I used to have 
a part time job there in the mid '60s.].

John K
Australia


  - Original Message - 
  From: John Rehwinkel 
  To: neonixie-l@googlegroups.com 
  Sent: Tuesday, March 14, 2017 11:22 PM
  Subject: Re: [neonixie-l] Radioactive Nixies - Study


a geiger counter will do nothing to reduce your nervousness, in fact it 
might even make it worse, for no real good reason.



  Quite true.  I have a Geiger counter, and was working on a difficult project 
at work and kept getting interrupted.  I brought my counter into work and just 
left it on my desk, clicking at the usual background radiation.  It made people 
really nervous and they pretty much left me alone.


  One time, I was taking a trip to Mexico to do some shopping, and brought it 
with me, just in case there might still be some Fiesta ware out there.  TSA 
searched my luggage every single time while it was there.


  As for radioactive equipment, I used to work for a firm that built monitoring 
gear for nuclear testing.  In one test, the tunnel collapsed, crushing our 
equipment enclosure.  A couple of years later, we got a call, saying our gear 
had been excavated, but it was full of probably-radioactive dust and partly 
crushed, asking if we still wanted it.  We declined, but I assume some gear 
like that surfaces at equipment auctions occasionally.  Maybe I should bring my 
counter to hamfests?


  I had a pet that was treated with iodine-131 for hyperthyroidism once.  I was 
told to discard any bedding after a week, because it would "become 
radioactive".  I-131 is a beta emitter, and beta rays (which are just 
electrons) can't make things radioactive, it takes neutrons to do that.  The 
only real dangers are excreted I-131 and, if the betas are energetic enough, 
and I use materials of high atomic weight as bedding, they could produce X rays.

Welcome to the fascinating world of radiation, known by little and feared 
by most, for no good reason. More people have been killed by fear of radiation 
than by radiation itself.



  Truth.


  - John



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Re: [neonixie-l] A new old NixiSat about to be built!

[John Rehwinkel]

> Greetings from a new list member in Switzerland!

Welcome!

> Lately I felt the urge to go back to some activity in electronics and radio 
> (I am also a licensed ham with callsign HB9FGJ) and I dug out of the attic 
> the boxes with the NixiSat kit and tubes.
> 
> Now it’s time to build it, and I’d like to ask for any specific advice from 
> other who have completed this kit, to know if there is any specific pitfall I 
> should be aware of.

I'm not familiar with that kit in particular, but I'd advise replacing any 
electrolytic capacitors with fresh ones.

> Finally, I have seen the PIR modification to extend the life of the tubes, 
> seems a reasonable thing to implement. I need to look into implementing it 
> once the clock is built.

Most of those are pretty straightforward and just directly shut down the HV 
supply when needed, without the need for any software modification.

> Best regards and 73 to all the hams out there!

Thanks, 73 and FB,
John Rehwinkel KG4L

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Re: [neonixie-l] Radioactive Nixies - Study

[John Rehwinkel]

> a geiger counter will do nothing to reduce your nervousness, in fact it might 
> even make it worse, for no real good reason.
> 
> 
Quite true.  I have a Geiger counter, and was working on a difficult project at 
work and kept getting interrupted.  I brought my counter into work and just 
left it on my desk, clicking at the usual background radiation.  It made people 
really nervous and they pretty much left me alone.

One time, I was taking a trip to Mexico to do some shopping, and brought it 
with me, just in case there might still be some Fiesta ware out there.  TSA 
searched my luggage every single time while it was there.

As for radioactive equipment, I used to work for a firm that built monitoring 
gear for nuclear testing.  In one test, the tunnel collapsed, crushing our 
equipment enclosure.  A couple of years later, we got a call, saying our gear 
had been excavated, but it was full of probably-radioactive dust and partly 
crushed, asking if we still wanted it.  We declined, but I assume some gear 
like that surfaces at equipment auctions occasionally.  Maybe I should bring my 
counter to hamfests?

I had a pet that was treated with iodine-131 for hyperthyroidism once.  I was 
told to discard any bedding after a week, because it would "become 
radioactive".  I-131 is a beta emitter, and beta rays (which are just 
electrons) can't make things radioactive, it takes neutrons to do that.  The 
only real dangers are excreted I-131 and, if the betas are energetic enough, 
and I use materials of high atomic weight as bedding, they could produce X rays.
> Welcome to the fascinating world of radiation, known by little and feared by 
> most, for no good reason. More people have been killed by fear of radiation 
> than by radiation itself.
> 
> 
Truth.

- John

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[neonixie-l] Any good (simple) guides to building puck converters?

[Paul Andrews]

I've come to the conclusion that I need to be able to build my own puck 
converters, at least so I can understand what I am looking at when I look at 
schematics for other people's converters! I could do with something that takes 
me from a simple example up to more complex examples that fix issues with the 
simple one. I had seen online something similar for current mirrors (I'll try 
and dig a link up later, I'm on the wrong device ATM). Any suggestions?

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[neonixie-l] A new old NixiSat about to be built!

[Paul Andrews]

Does this help (not sure it is the same thing, but it might help you get in 
touch with the right people): 
http://www.azevedo-devices.com/blog/nwts-syncing-a-jeff-thomas-gpsii-clock

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[neonixie-l] Re: Radioactive Nixies - Study

[Paul Andrews]

Which is where my thoughts about the provenance of tubes from the Ukraine 
arises. Where are these warehouses that for some reason still have large 
quantities of Nixie tubes in them?

This doesn't keep me up at night, but I would like to know. Perhaps someone 
could make a documentary about the supply chain for old Nixie tubes from the 
former USSR? I'm not sure there would be a huge market for it though!


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Re: [neonixie-l] Re: Radioactive Nixies - Study

[Luca Bertagnolio]

On 14 March 2017 at 09:25:17, newxito (axta...@gmail.com) wrote:
I begin to get really nervous, I think I'll buy a geiger counter
a geiger counter will do nothing to reduce your nervousness, in fact it might 
even make it worse, for no real good reason.

What can help you dominate your unwarranted nervousness about radiation is 
studying the topic, and understanding how much it has been inflated by the 
media and politicians, which love it as a topic, because it helps them a great 
deal in selling their “product”, be it newspapers, magazines, clicks on a 
website, or votes.

If you are curious, then you can find these two resources, freely available 
online, interesting:

http://nuclear4life.com/

http://www.mn.uio.no/fysikk/tjenester/kunnskap/straling/radiation-and-health-2015.pdf

Welcome to the fascinating world of radiation, known by little and feared by 
most, for no good reason. More people have been killed by fear of radiation 
than by radiation itself.

Bye, Luca



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Re: [neonixie-l] Re: Radioactive Nixies - Study

[Paolo Cravero]

On Tue, Mar 14, 2017 at 9:25 AM, newxito wrote:

I begin to get really nervous, I think I'll buy a geiger counter
>

Measuring radioactivity is a science itself and to get meaningful data you
need to have a good understanding of the phenomena (physics).

For example, measuring emissions close to the object will never represent
real-life situations where Nixies (in this case) sit on a shelf in the
living room. Also, an object that has been in a radioactive environment
doesn't turn active itself (in general). I am sure NeonJohn could tell a
lot about this subject.

If you are into building circuits, search for "BPW34 counter" and pick one:
this will give you an initial idea of what is active around you. The
photodiode must be shielded from light (but not too much otherwise you
block beta/weak radiation).

For a very quick way, get the Radioactivity Counter by Mr Klein (both
Android and Apple) that uses the photocamera of a smartphone operated in
darkness (use kitchen Alu foil kept in place by the back cover: removable,
mechanical, no sticky tape needed thus reusable on the field). His
documentation also does a good job explaining how to operate properly the
App, which creates a background for the BPW34 too. You won't get absolute
uS/h values, but you'll begin to "see" what is around you. Note that it
took me months before I came across something active. Also note that the
photocamera is sensitive to a definite range of energy in ionizing
particles (smtg like 200 to 600 kEv), so you won't get weaks and strongs,
but it is a starting point IMO.

That said, counters with Geiger-Muller tubes seem to hold their market
value, but you need to understand what the meter is telling you, and how
you measure.

As Jonathan said, with Nixies the higher danger is through ingestion, but
for other obvious reasons!

Paolo

PS: thanks for both 5092A pictures. Looks like mine are normal 5092.

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[neonixie-l] Re: Radioactive Nixies - Study

[newxito]

I begin to get really nervous, I think I'll buy a geiger counter

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[neonixie-l] Re: FS: IV-4, IV-12, IV-17, IV-26

[Yuriy Ovchinnikov]

Actual list:

Cathode ray tubes

3LO1I – 72 pcs. for $15,

6LO1I – 104 pcs.,

8LO4I – 11 pcs.,

8LO29I – 47 pcs. for $20,

8LO30I – 1 pc. for $100,

8LO39V – 20 pcs. for $20,

10LO2I – 18 pcs.

13LМ31V – 7 pcs.,

13LO18V – 1 pc.,

13LO37I – 1 pc.,

16LO2V – 1 pc.,

16LO2I – 1 pc.,
18LМ5V – 1 pc.
Nixie:

IV-1 – 39 pcs. for $0.6,
IV-3 used – 13 pcs. for $0.5,

IV-3A – 142 pcs. for $0.8,

IV-4 – 75 pcs. for $2,
IV-6 – 126 pcs. for $0.8,
IV-6 used – 19 pcs. for $0.5,
IV-8 – 191 pcs. for $0.8,

IV-11 – 120 pcs. for $1,
IV-11 used – 4 pcs. for $0.5,
IV-12 – 370 pcs. for $1.5,
IV-20 – 2 pcs. for $20,

IV-22 – 87 pcs. for $0.5,
IV-26 – 500 pcs. for $2,
IV-28А – 1 pcs. for $5,
IVL-1-7/5 – 2 pcs. for $10,

IVL-2-7/5 – 24 pcs. for $1.5,

IVLShU-1-11/2 – 39 pcs. for $5,

IN-1 – 309 pcs. for $1,

IN-2 – 30 pcs. for $1.8,
IN-3 – 199 pcs. for $0.5,

IN-8 – 2 pcs. for $5,

IN8-2 – 3 pcs. for $8,

IN8-2 used – 21 pcs. for $5,

IN-9 used – 11 pcs. for $3,

IN-12A – 42 pcs. for $2, 

IN-12B – 1 pcs. for $2,

IN-13 – 1 pcs. for $3,
IN-14 – 81 pcs. for $5,

IN-14 used – 328 pcs. for $2.5,

IN-15А – 19 pcs. for $1,
IN-15B – 14 pcs. for $1,

IN-16 – 127 pcs. for$5

IN-16 used – 374 pcs. for $2.5

IN-17 – 26 pcs. for $3,

IN-17 used – 6 pcs. for $1.5,

Sockets for IN18, IN4, IN7 - 56 pcs. for $2.5

Sockets for IN18, IN4, IN7 used - 12 pcs. for $2

IN-19A used – 1 pc. for $1.5,

IN-19B used – 1 pc. for $1.5,

IN-19V – 2 pcs. for $2,

IN-28 – 83 pcs. for $3

LC-531 Dolam used – 1 pc. for $2,5

Z560M WF – 4 pcs. for $3

Z570M used – 37 pcs. for $3
5870 ITT England used – 9 pcs. for $10

четверг, 10 сентября 2015 г., 7:39:43 UTC+3 пользователь Yuriy Ovchinnikov 
написал:
>
> FS: 
> IV-4 - 11 pcs., 
> IV-12 - 73 pcs., 
> IV-17 - 13 pcs., 
> IV-26 - more 800 pcs.
> Anyone want?
>

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