Re: [neonixie-l] Re: O.T.but...

[Tom Harris]

Even easier, all you need is a flat surface and a pen. Simply use a book to
hold the pen at about half the diameter of the cap off the surface.
Books work well as you can adjust the height simply by adding pages. Then
put several marks with the pin at different positions of the end of
the cap. Your centre is in the middle of the marks, which if they are close
together is easy to get. Simple.


Tom Harris 


On 25 July 2014 19:42, petehand  wrote:

> Is THAT what the V-shaped thing is for? I'm indebted to you sir - I never
> knew what it was for.
>
>
>
> On Tuesday, July 22, 2014 10:39:42 PM UTC-7, Nixcited delighted wrote:
>>
>> I use a fairly cheap device found in most UK hardware/tool shops as part
>> of a sliding rule set. In my case it included just the sliding square on
>> the left and the circle centre finder on the right. The middle piece is an
>> angle finder/setter.
>>
>> You use the centre finder in exactly the way Nick described - place the
>> angle around your circle in several places and draw lines along the rule.
>> Where the lines intersect is your point. Punch it and drill.
>>
>>  --
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[neonixie-l] Re: Strange Strobe Behavior on my Nixie Clock

[Dman777]

I think I might of caused some confusionwhen I say tubes are turned 
offI mean.there is a dimmer setting and you can dim them all the 
way to not being on. I see that weird flickering in the back even when they 
are turned on their brightestbut it's barely noticeable because the 
tubes are on full bright. Does this change anything in the diagnostics? 
Sorry, I'm pretty daft to this stuff. 



On Thursday, July 24, 2014 12:49:25 AM UTC-5, Dman777 wrote:
>
> I have this strange behavior with my Nixie clock. The right column marker 
> strobes like there is some kind of short. This clock has a timer function 
> where I can turn off the tubes at a certain time. When the tubes go off, 
> that column marker still strobes on. And also, when the 2 tubes to the 
> right of that column marker are slightly strobing on and off with the 
> column marker. 
>
> What exactly is causing this? And does it mean that the circuitry may not 
> last as long as the life of the tubes? 
>
> Video 1:
> Strobing column with tubes on:
> http://youtu.be/HeQjneaF7AA
>
> Strobing column and tubes when tubes are off:
> http://youtu.be/KKrKTdNek6I
>
>
> Thanks,
> -Darin
>
>

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Re: [neonixie-l] Re: Strange Strobe Behavior on my Nixie Clock

[Dekatron42]

Try using TLP627 from Toshiba, they are usually used by these designers but 
they are more expensive so some use the cheaper and inadequate PC817 and 
hope that it will work. However if the designer has switched the base and 
emitter that is a design error. You can look at this document that has been 
around for ages on driving 
Nixies: http://web.jfet.org/nixie-1/NixieTransistors.pdf

/Martin

On Saturday, 26 July 2014 15:10:02 UTC+2, Arne Rossius wrote:
>
> Hi, 
>
> Darin Hensley wrote: 
> > Here is the diagram I tried to capture with my phone. With this helps 
> any 
> > I'm trying to see what is causing it? 
>  
>

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Re: [neonixie-l] Re: Strange Strobe Behavior on my Nixie Clock

[Arne Rossius]

Hi,

Darin Hensley wrote:
> Here is the diagram I tried to capture with my phone. With this helps any
> I'm trying to see what is causing it?

The PC817 optocouplers are only specified for a collector-emitter
voltage of 35V, so it is very likely one of them is breaking down when
its tube is turned off. It might be a good idea to replace them with
optocouplers that can withstand a higher voltage.

Biasing to 85V won't work with these optocouplers, because
(175V - 85V) = 90V > 35V.

If the pin numbers in the schematic are correct, the optocoupler
transistors are also connected in reverse (pin 3 = emitter to +HV), in
which case the specified voltage is only 6V. However the position of the
pins makes me think that very likely, the pin numbers are incorrect and
the transistor is connected correctly (usually, pin numbers are counted
in counter-clockwise direction around the package, however here it is
1-2-4-3).


Best Regards,
Arne

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Re: [neonixie-l] Re: Can anyone here use these?

[Dan Harboe Burer]

As far as I can see they are neon bulbs. I haven’t taken the modules themselves 
apart – but the tips and bases of the bulbs look like neon :)

Dan

From: gregebert 
Sent: Friday, July 25, 2014 11:18 PM
To: neonixie-l@googlegroups.com 
Subject: [neonixie-l] Re: Can anyone here use these?

Are the bulbs neon, or incandescent ? Someone could theoretically adapt a 
nixie-tube clock to drive neon bulbs and use just the shells from the modules.
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