IN-4 Variations

[coggs]

I'm laying out a board for IN-4s. Thanks to Dieter, I had great info to go by, but I noticed a small discrepancy. In both the tubes I have and his photos, the vertical axis of the digits is actually slightly off. This is due to the pin being welded to the side of the interior support (see photo).  Has anyone who has seen allot of IN-4s know if this is pretty much the norm ? TIA
..c
www.cogwheelcircuitworks.com

[Dieter Waechter]

Well Bob,
the problem is, that the pinout is understood wrong in 99.9% for both, IN-18 and IN-4.
All PCB designs for the IN-18 I have seen from other people are WRONG!
Example:
 IN-18:
All tell, me included, that pin 4 is pointing to the front.
see my page here:
http://www.tube-tester.com/sites/nixie/data/in18.htm
I know: it is wrong!
I do tell that on my page as well to avoid "dumb" questions.
But what is right?
Which pin is in front?
The answer is easy:
NO pin is in front!
Right is, that pin 4 must be in one line with pin 11 and pin 1 must be in one line with pin 14.
(same at the IN-4!)
See the picture here:
http://www.tube-tester.com/sites/nixie/nixie-clocks/IN-18-BD/pic/IN-18-BD-inside.jpg
Can you see it?
Pin 4 is not pointing to front – only nearly!

That's why in all IN-18 clock I have seen the digits (cathodes) stand inclinded to the longitudinal axis of the clock.

Now immediately go to your IN-18 clock and check it! Do the cathodes stand even? Then the designer did get it right!
;-)
Dieter

[Quixotic Nixotic]

Dieter, you never saw my IN-18 clock then, because I think I got it right and I made that clock years ago.

http://www.clock-it.net/nixie_clocks/in-18_clock.html

Regards, John

[Jeff Thomas]

On 6 May 2012, at 17:08, Dieter Waechter wrote:

Well Bob,
the problem is, that the pinout is understood wrong in 99.9% for both, IN-18 and IN-4.
All PCB designs for the IN-18 I have seen from other people are WRONG!

;-)
Dieter

Dieter, you never saw my IN-18 clock then, because I think I got it right and I made that clock years ago.

http://www.clock-it.net/nixie_clocks/in-18_clock.html

Regards, John

Ditto, with regard to the NixiChron. That's a lofty claim Dieter. I'm surprised you'd make such a statement here.

Regards, Jeff
 

[Dieter Waechter]

>Dieter, you never saw my IN-18 clock then, because I think I got it right
>and I made that clock years ago.

Yeah John!!! that's it!
I have seen it but never realized the (right) pinout on it.
I love that design by the way.
Dieter

[coggs]

Ok, sorry to get Pedantic, but my question was misunderstood. What I am saying is that I have observed a variation in the position of pin 1 in both Dieter's photo and my photo. The datasheet (attached) shows what I am talking about.

My question, and really only someone who has seen hundreds of IN4s from different lots can answer this, Can I expect to see this discrepancy in most, some or all IN4s ?

[coggs]

Oops. Disregard that last jpg. My bad. It is actually pin 14 that that is directly below the horizontal baseline of the digits. Corrected diagram attached.

I think my solution will be to make the holes generously large;  maybe about ~120% the diameter of the pins.

[Quixotic Nixotic]

On 6 May 2012, at 18:10, coggs wrote:

My question, and really only someone who has seen hundreds of IN4s from different lots can answer this, Can I expect to see this discrepancy in most, some or all IN4s ?

As someone who has seen hundreds of IN4s from different lots, I think you are the best person to know if you can expect this discrepancy. As you seem to infer that you have not observed it before I conclude that you are probably looking at a maverick bunch, welded by Olga from the Volga after she's overdone the stolly a bit.

John S

[Tidak Ada]

Why I cannot view these pics in Photoshop and Windowas IExplore ?

I get a message there are invalid JPEG markings....

 

eric

---

From: neoni...@googlegroups.com [mailto:neoni...@googlegroups.com] On Behalf Of coggs
Sent: zondag 6 mei 2012 18:50
To: neoni...@googlegroups.com
Subject: Re: [neonixie-l] IN-4 Variations

Ok, sorry to get Pedantic, but my question was misunderstood. What I am saying is that I have observed a variation in the position of pin 1 in both Dieter's photo and my photo. The datasheet (attached) shows what I am talking about.

My question, and really only someone who has seen hundreds of IN4s from different lots can answer this, Can I expect to see this discrepancy in most, some or all IN4s ?

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