Brad Velander wrote:
> Tim,
> the simple answer to your problem should be the use of the Short
> Circuit Constraint rule under the "Other" tab in the design rules. However,
> the last time any of us tried it (SP5 I believe) it didn't work.
> So the only other option open is to use the virtual shorting jumper
> a described by Abd ul-Rahman many times. You can find the description of
> this methodology in the FAQ sheet in one of the Yahoo Protel groups sites. I
> don't actually use this process so I would probably hack it to death if I
> tried to describe it to you.
I tried this on a recent board, and had mixed results. I had a row of
12 3-pin jumpers, and 4 of the 12 were successfully shorted, the other
8 had a visible gap in the copper, about .004", I'd guess. It seems there
may have been roundoff either in Protel or at the photoplotter that caused
some of these .00005" gaps to become much larger. I'm going to have to
come up with a better scheme for this that ensures the jumpers are truly
shorted.
Jon
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