[neonixie-l] Re: here we go again, picaxe and 74141 problem.

2010-10-25 Thread Shane Ellis 
the tube is fine, I rebuilt the circuit on my giant proto board, and
hey presto, it works just fine.  I think since I was so cramped, I
missed a ground, or had a bad connection somewhere.
Thanks all, once again though, one small detail gets in my way.

On Oct 24, 4:52 pm, "A.J. Franzman"  wrote:
> This should be obvious, but you didn't mention it: did you check the
> tube itself by hardwiring it? It is not unheard of for nixies to
> develop internal shorts.

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[neonixie-l] Re: here we go again, picaxe and 74141 problem.

2010-10-24 Thread A.J. Franzman 
This should be obvious, but you didn't mention it: did you check the
tube itself by hardwiring it? It is not unheard of for nixies to
develop internal shorts.

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[neonixie-l] Re: here we go again, picaxe and 74141 problem.

2010-10-23 Thread Shane Ellis 
The only problem with that is, that the pin in question ( Picaxe pin
4) is physical pin 3.  I'm still pursuing this as an answer in the
Picaxe manuals.  Thanks for  a direction to look!
Shane
On Oct 23, 8:21 pm, "Bill van Dijk"  wrote:
> Shane,
>
> I don't know the Picaxe well, but the regular PIC's pin 4 on the port A are
> open collector. They will sink, but not go high unless you use an external
> pull-up resistor to VDD. Check your Picaxe manual for this.
>
> Cheers, BILL
>
>   _  
>
> From: neonixie-l@googlegroups.com [mailto:neonixi...@googlegroups.com] On
> Behalf Of Shane Ellis
> Sent: Saturday, October 23, 2010 8:25 PM
> To: neonixie-l
> Subject: [neonixie-l] here we go again, picaxe and 74141 problem.
>
> I'm using a Picaxe 08M, and an IN-14 tube,  a standard 74141 driver,
> and a Tayloredge power supply.  I had a similar problem some months
> back, and the fix I used last time, isn't cutting it this go round.
> When pin 4 goes high (output) both the Zero, and Nine light up at the
> same time.  I know my code is good, and all my grounds are good,  the
> legs of the HVPS, the 74141, and the Picaxe are all grounded by way of
> capacitor.  I checked all voltages,  all measure about 4.95V, and the
> current sits at 1.30mA in low state and 0V when in high state.   All
> other numbers, 1-8, work perfectly, but the two digits that require
> pin 4, don't work properly.  Any suggestions?  Something I
> overlooked?  Dumb mistake I made?
>
> Thanks
> Shane
>
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