Re: [neonixie-l] wrong numbers

[jb-electronics]

I like it too, because the physicists don't come off too badly. ;-)

Jens

Am 21.07.2011 20:28, schrieb Jonathan Peakall:

Hahaha! Loved it.

An engineer, a mathematician, and a physicist are staying for the
night in a hotel. A small fire breaks out in each room.

The mathematician awakes, sees the fire, makes some careful
observations, and on a blackboard installed in the room, does some
quick calculations. He exclaims "A solution exists!", and crawls
back into bed and goes to sleep.

The physicist awakes, sees the fire, makes some careful
observations, and does some quick calculations. Grabbing the fire
extinguisher, he puts out the fire with one, short, well placed
burst, and then crawls back into bed and goes back to sleep.

The engineer awakes, sees the fire, grabs the fire extinguisher,
he puts out the fire by hosing down the entire room several times
over, and then crawls into his bed and goes back to sleep.

-Adam


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Re: [neonixie-l] wrong numbers

[Jonathan Peakall]

Hahaha! Loved it.
  An engineer, a mathematician, and a physicist are staying for the night in a 
hotel. A small fire breaks out in each room. 
  The mathematician awakes, sees the fire, makes some careful observations, and 
on a blackboard installed in the room, does some quick calculations. He 
exclaims "A solution exists!", and crawls back into bed and goes to sleep.


  The physicist awakes, sees the fire, makes some careful observations, and 
does some quick calculations. Grabbing the fire extinguisher, he puts out the 
fire with one, short, well placed burst, and then crawls back into bed and goes 
back to sleep. 

  The engineer awakes, sees the fire, grabs the fire extinguisher, he puts out 
the fire by hosing down the entire room several times over, and then crawls 
into his bed and goes back to sleep. 

  -Adam



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Re: [neonixie-l] wrong numbers

[Shane Ellis]

It's an IN-14.
I have a running version of this exact same circuit, I built into a
Christmas ornament, been running perfectly since I powered it on, on
December 23rd.  I looked at my old files, and this is identical, and still
this one is acting buggy.  I'll mess with it again tomorrow, and let
everyone know what, if anything, I figured out.

Shane

On Tue, Jul 19, 2011 at 11:06 PM, J Forbes wrote:

> Is it a biquinary tube?  :)
>
> Shane Ellis wrote:
> >  the only digits that light up, are 2, 3, 6, and
> > 7, but those should be 0, 1, 2, and 3.
>
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Re: [neonixie-l] wrong numbers

[J Forbes]

Is it a biquinary tube?  :)

Shane Ellis wrote:
>  the only digits that light up, are 2, 3, 6, and
> 7, but those should be 0, 1, 2, and 3.

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Re: [neonixie-l] wrong numbers

[Adam Jacobs]

What is the purpose of the 330ohm resistor on the +5v of the 74141? I
thought maybe I've been using it wrong all along and popped open my copy of
the TTL cookbook.. Nope, nothing in there about current limiting the 74141.
Mike's right, give us a schematic. :)

While I was in the TTL cookbook, I happened to glance at the facing page...
Has anyone ever seen a 74142? Looks like a neat chip, but I don't see any on
ebay.

-Adam

On Tue, Jul 19, 2011 at 7:29 PM, Shane Ellis  wrote:

> The other problem is, some of them don't display at all.  I know I have the
> Anode correctly connected ( I can see the ceramic insulator at the base of
> the pin, inside the bottle)  the only digits that light up, are 2, 3, 6, and
> 7, but those should be 0, 1, 2, and 3.  Pins are all connected properly to
> the 74141, I checked and quadruple checked.  I put a different code in
> there, just to check, and same result.  I suspect I have a bad ground, or
> poor grounding scheme somewhere.  Perhaps, something is getting too much
> current?  I have a 330 ohm on the +5v of the 74141, and the tube itself, has
> a 10K on the anode.  No other resistors or caps are in this circuit.  Maybe
> I got lucky last time when this worked, but this time, it's not happening.
>
> Shane
>
>
> On Tue, Jul 19, 2011 at 9:12 PM, David Forbes wrote:
>
>> On 7/19/11 6:46 PM, Mimewar wrote:
>>
>>> OK, so I have a tube breadboarded properly, copied the circuit I built
>>> last time, but the wrong numbers are being displayed.  My code is good
>>> ( same as on another working project)  the circuit is identical, but
>>> instead of a 1, I get a 3, instead of a 2, I get a 6.  Any ideas?
>>> Common causes?
>>> Frustrated in Aurora
>>>
>>> Shane
>>>
>>>
>> What are all the numbers displayed as? Then we can figure out which wires
>> are swapped.
>>
>>
>> --
>> David Forbes, Tucson AZ
>>
>>
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Re: [neonixie-l] wrong numbers

[Shane Ellis]

The other problem is, some of them don't display at all.  I know I have the
Anode correctly connected ( I can see the ceramic insulator at the base of
the pin, inside the bottle)  the only digits that light up, are 2, 3, 6, and
7, but those should be 0, 1, 2, and 3.  Pins are all connected properly to
the 74141, I checked and quadruple checked.  I put a different code in
there, just to check, and same result.  I suspect I have a bad ground, or
poor grounding scheme somewhere.  Perhaps, something is getting too much
current?  I have a 330 ohm on the +5v of the 74141, and the tube itself, has
a 10K on the anode.  No other resistors or caps are in this circuit.  Maybe
I got lucky last time when this worked, but this time, it's not happening.

Shane

On Tue, Jul 19, 2011 at 9:12 PM, David Forbes  wrote:

> On 7/19/11 6:46 PM, Mimewar wrote:
>
>> OK, so I have a tube breadboarded properly, copied the circuit I built
>> last time, but the wrong numbers are being displayed.  My code is good
>> ( same as on another working project)  the circuit is identical, but
>> instead of a 1, I get a 3, instead of a 2, I get a 6.  Any ideas?
>> Common causes?
>> Frustrated in Aurora
>>
>> Shane
>>
>>
> What are all the numbers displayed as? Then we can figure out which wires
> are swapped.
>
>
> --
> David Forbes, Tucson AZ
>
>
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Re: [neonixie-l] wrong numbers

[David Forbes]

On 7/19/11 6:46 PM, Mimewar wrote:

OK, so I have a tube breadboarded properly, copied the circuit I built
last time, but the wrong numbers are being displayed.  My code is good
( same as on another working project)  the circuit is identical, but
instead of a 1, I get a 3, instead of a 2, I get a 6.  Any ideas?
Common causes?
Frustrated in Aurora

Shane



What are all the numbers displayed as? Then we can figure out which 
wires are swapped.



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David Forbes, Tucson AZ

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