Re: [neonixie-l] About this type edge lit display.

[JohnK]

Morris, maybe try having an idle current in all the lamps - just at the 
filament starts glowing point [not visibly glowing].

Re LEDs, I noticed some small LED Xmas lights that had a bezel with an inverted 
cone - apex pointing at the LED. They spread light around 'differently'.

John K.
  - Original Message - 
  From: Morris Odell 
  To: neonixie-l@googlegroups.com 
  Sent: Monday, May 19, 2014 6:55 PM
  Subject: Re: [neonixie-l] About this type edge lit display.


  Hi all,

  A few years ago I built a 6 digit clock using those indicators. They are 
multiplexed and the clock looks terrific. Mine uses 12V flange based bulbs. The 
downside is that the bulbs don't last all that long when multiplexed at the 
theoretically correct voltage of 12 * sqrt(6) = 30 V (approx). Those little 
bulbs are not easy to find. The local professional suppliers (RS or Farnell) 
have them but you need to buy 100 at a time. I have had some success 
substituting LEDs as the quality and colour of high intensity warm white LEDs 
have improved. Once I run out of my last purchase of 100 bulbs which should be 
in about a year at the current rate, I'll install them. It won't look quite the 
same but them's the breaks. 

  Substituting LEDs is not straightforward. The issue with LEDs is that the 
light intensity is maximal in one direction while a small hot filament 
quasi-isotropically radiates in all directions. The bulb housings are like an 
integrating sphere with a slit where the edge of the perspex picks up the 
light. If the LED radiating direction does not coincide with the slit you lose 
a lot of it so even with very bright 5 mm LEDS the display looks dim compared 
to when a bulb is used. Recently I picked up a batch of warm white LEDs which 
have short bodies thus allowing more of the light to be bounced around inside 
the integrating housing and they are not too bad. I've got quite a collection 
now of unsuitable high intensity white LEDs!

  Morris




  On Monday, 19 May 2014 09:37:22 UTC+10, Dave Brown wrote:
Yes-those KGM displays are really quite interesting. 
 Has anyone come up with an LED replacement for the bulbs in them? 
DaveB, 
Christchurch, NZ 



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Re: [neonixie-l] About this type edge lit display.

[Morris Odell]

That's exactly what I've done. As the bulbs failed I saved them and managed 
to remove the innards while saving the base and not cutting my fingers in 
the process :-) A 5 mm LED fits in nicely. 

John K's suggestion about idling current is  a good one, but it will 
involve a rebuild of the clock to fit in the 45 resistors that would be 
required. The modifications to accommodate LEDS are much easier. 

One tip I would give anyone contemplating using these displays - make sure 
you allow enough room to undo them easily so you can replace the bulbs. I 
didn't realise that I would have this problem when I built the clock so 
bulb replacement involves quite a bit of disassembly and is rather a chore.

Morris
On Tuesday, 20 May 2014 01:28:38 UTC+10, I wrote:
>
> Here's a thought. You MIGHT try to remove the bulbs and then break the 
> glass and gut the base of the bulb, trying not to damage it. 
>
>
>

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Re: [neonixie-l] Nixie tube clock ghosting issues

[David Forbes]

Hi,

I think you have a timing issue. Your code turns on the anode and then 
changes the cathode.


Try modifying each tubx() routine to turn on the cathode first, then 
delay one millisecond, then turn on the anode.



On 5/20/14 5:43 AM, Cristinello wrote:

Hello guys,
I built a relatively simple nixie clock and I am encountering severe
ghosting issues. To drive the mainboard I used an Arduino ( because I lack
programming knowledge) . I will attach the schematic and the .ino file from
the Arduino IDK . The schematic does not contain the nixie board beacuse it
is a modular design  but it is straightforward. I am using 4028 BCD to
decimal decoder to drive the nixies and the transistors are SMD versions of
the FMMTA92 and 42. The power supply has also a strange behaviour , when
left without any consumer , the output voltage is going down wih aprox
1Volt/30 seconds. If someone has any idea about what may be wrong I will be
very very grateful .Thank you in advance!




--
David Forbes, Tucson AZ

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[neonixie-l] Re: Nixie tube clock ghosting issues

['threeneurons' via neonixie-l]

Yes, alter your timing, as David suggested.

But also, those 100K resistors across the bases and emitters, of those A92s 
can be made smaller. Say 10K. The junction, will keep the voltage below 
0.7V, so most of the current will still flow thru those junctions. Those 
resistors' primary purpose is to bleed off charge once the voltage drops 
below that 0.7V junction, and it starts looking like an open circuit.

Though, Its more likely a timing issue.

On Tuesday, May 20, 2014 5:43:16 AM UTC-7, Cristinello wrote:
>
> Hello guys,
> I built a relatively simple nixie clock and I am encountering severe 
> ghosting issues. To drive the mainboard I used an Arduino ( because I lack 
> programming knowledge) . I will attach the schematic and the .ino file from 
> the Arduino IDK . The schematic does not contain the nixie board beacuse it 
> is a modular design  but it is straightforward. I am using 4028 BCD to 
> decimal decoder to drive the nixies and the transistors are SMD versions of 
> the FMMTA92 and 42. The power supply has also a strange behaviour , when 
> left without any consumer , the output voltage is going down wih aprox 
> 1Volt/30 seconds. If someone has any idea about what may be wrong I will be 
> very very grateful .Thank you in advance!
>

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Re: [neonixie-l] Digest for neonixie-l@googlegroups.com - 17 updates in 2 topics

[Smith John]

You see I am a chinese,and I had a lot of "NOT FAKE LM9022 made by NS"
all brand new in org pack,and as me experiance in driving VFD stuffs
,I only used this chip in one project,and I think this chip is too old
for the current tech,by using only two mosfets and drived via a MCU
tim can replace this old chip easily .Try to check the new circuit via
my web site for driving VFD.
http://vfdclock.jimdo.com

And btw,If somebody really need this old chip for <100pcs,I have it.contact me.

2014-05-20 15:50 GMT+08:00  :
>   Today's topic summary
>
> Group: http://groups.google.com/group/neonixie-l/topics
>
> VFD power supply plans or kits? [7 Updates]
> About this type edge lit display. [10 Updates]
>
>  VFD power supply plans or kits?
>
> petehand  May 19 01:58AM -0700
>
> LM9022 - tens if not hundreds of thousands of them available here -
>
> http://www.chinaicmart.com/buyer/search.html?sel1=1&keyword=LM9022&Submit.x=0&Submit.y=0&Submit=Submit
>
>
>
> David Forbes  May 19 09:26AM -0700
>
> I wonder about those listings. Is there any reason to believe that these
> parts are real? Why would some random Chinese company happen to have
> 50,000 of a National Semi chip that went obsolete many years ago?
>
> Do any of you have experience buying from this China IC Mart?
>
>
>
> On 5/19/14 1:58 AM, petehand wrote:
>
> --
> David Forbes, Tucson AZ
>
>
>
> Spencer W  May 19 11:29AM -0500
>
> I've bought them and they work fine.
>
>
>
> "Tidak Ada"  May 19 09:02PM +0200
>
> It may be they use their own fake chips that they branded NS. There are lots
> of fake chips and semi's on the Chinese market and eBay!
>
> eric
>
> -Original Message-
> From: neonixie-l@googlegroups.com [mailto:neonixie-l@googlegroups.com] On
> Behalf Of David Forbes
> Sent: maandag 19 mei 2014 18:26
> To: neonixie-l@googlegroups.com
> Subject: Re: [neonixie-l] Re: VFD power supply plans or kits?
>
> I wonder about those listings. Is there any reason to believe that these
> parts are real? Why would some random Chinese company happen to have 50,000
> of a National Semi chip that went obsolete many years ago?
>
> Do any of you have experience buying from this China IC Mart?
>
>
>
> On 5/19/14 1:58 AM, petehand wrote:
>> LM9022 - tens if not hundreds of thousands of them available here -
>
>> http://www.chinaicmart.com/buyer/search.html?sel1=1&keyword=LM9022&Sub
>> mit.x=0&Submit.y=0&Submit=Submit
>
> --
> David Forbes, Tucson AZ
>
> --
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> https://groups.google.com/d/msgid/neonixie-l/537A30AC.5070309%40dakotacom.ne
> t.
> For more options, visit https://groups.google.com/d/optout.
>
>
>
> Per Jensen  May 19 10:08PM +0200
>
>
>> It may be they use their own fake chips that they branded NS. There are
>> lots
>> of fake chips and semi's on the Chinese market and eBay!
>
> Maybe we can persuade Spencer to hit one with the propane torch, until the
> epoxy case is burnt to a white crisp, then it's easy to remove the die from
> the mess, clean it in alcohol and then put under a 100x microscope to check
> for die markings.
>
> // Per.
>
>
>
> Spencer W  May 19 03:13PM -0500
>
> I would be more than happy if you want to send a 100x microscope to me or I
> can throw it to someone that does have one on the list.
>
> Sent from my iPhone
>
>
>
>
> David Forbes  May 19 01:26PM -0700
>
> I have access to some nice microscopes at my lab at the University. I could
> take
> a photo of it and post it, as I don't look at enough bare dice to be able to
> identify 1980s silicon artwork from the modern Chinese stuff.
>
>
> On 5/19/2014 1:13 PM, 'Spencer W' via neonixie-l wrote:
>
>
>
>  About this type edge lit display.
>
> petehand  May 19 01:39AM -0700
>
> 
>
> 
>
> 
> They are nice displays - I had a handful of them once, that plugged in to a
> multi pin socket.
>
> Now I have a few of these - rather special ones, made by Stanley
> Electronics, Tokyo.
>
>
>
> petehand  May 19 01:42AM -0700
>
> Here's what they were made for and what they look like lit up. It's a
> little bartop slot machine, made around 1970, and just 12 inches in every
> direction. It was a complete wreck when I got it.
>
>
>
> petehand  May 19 01:47AM -0700
>
> 
>
> 

RE: [neonixie-l] About this type edge lit display.

[Tidak Ada]

John,
 
That's called a 'bat-wing' named to the shape of the radiation diagram. 
You can get LED's with such a housing (Power LEDs in any case).
 
eric

  _  

From: neonixie-l@googlegroups.com [mailto:neonixie-l@googlegroups.com] On
Behalf Of JohnK
Sent: dinsdag 20 mei 2014 10:26
To: neonixie-l@googlegroups.com
Subject: Re: [neonixie-l] About this type edge lit display.


 [] 
Re LEDs, I noticed some small LED Xmas lights that had a bezel with an
inverted cone - apex pointing at the LED. They spread light around
'differently'.
 
John K.

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