Hey, Neil, where's your fighting spirit?!
Never give up!
I think it's doable... you don't actually have to take out the wires to the
DP, just slowly work your way through the lens until you hit the die. You
probably don't even have to drill through the die, just swirl the workings
up a bit and break that little whisker. Use the reflective die base as a
stopping point to keep you from getting to deep and breaking any circuitry.

- Robert


----- Original Message -----
From: "Picdude" <picdude@NARWANI.ORG>
To: <PICLIST@mitvma.mit.edu>
Sent: Friday, August 22, 2003 8:31 PM
Subject: Re: [PICLIST] [EE:] How can I destroy select LED segments?


> I'm paranoid about this, cause I don't know where the wires run
internally.
>
> Cheers,
> -Neil.
>
>
>
> On Friday 22 August 2003 22:14, John Ferrell scribbled:
> > How about drilling a tiny hole in the led?
> >
> > John Ferrell
> > 6241 Phillippi Rd
> > Julian NC 27283
> > Phone: (336)685-9606
> > johnferrell@earthlink.net
> > Dixie Competition Products
> > NSRCA 479 AMA 4190  W8CCW
> > "My Competition is Not My Enemy"
> >
> >
> > ----- Original Message -----
> > From: "Picdude" <picdude@NARWANI.ORG>
> > To: <PICLIST@MITVMA.MIT.EDU>
> > Sent: Friday, August 22, 2003 12:54 PM
> > Subject: [EE:] How can I destroy select LED segments?
> >
> >
> > I'll probably get sent off to the looney-bin for this one, but it's
worth a
> > shot still...
> >
> > I'm working on a PIC circuit that will send its output to a few 7-seg
> > LED's. The 7-seg displays are all part of one integrated multiplexed
unit,
> > but only one digit will need to have the DP (decimal-point) on, and it
will
> > always be on.
> >
> > However, I'm just one pin short, and I'd like to avoid adding more parts
> > (by multiplexing, etc), so I thought of just running outputs to the 7
main
> > segments, and hard-wiring the DP to be always on.  But this means I need
to
> > destroy the DP on the other digits (which will always have the DP off).
> >
> > So if I selectively zap each of the OFF decimal points with say 12V, can
I
> > selectively destroy those dp's WITHOUT destroying any other display
> > segments?
> > Standard logic tells me I should be okay, but I fear that there's more
to
> > it.
> >
> > FWIW, I found another way to solve this problem (sending the
column-select
> > output of the digit with the ON DP to the DP input of the display, and
> > using CA displays with NPN transistors).  But I think that burning out
> > unwanted segments can be very useful for other purposes, so the question
> > still stands.
> >
> > Cheers,
> > -Neil.
>
> --
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> ways.  See http://www.piclist.com/#archives for details.
>

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