Re: gEDA-user: pcb via and ground planes

[gene glick <carzrgr8@xxxxxxxxxxxxx>]

DJ Delorie wrote:
> I talked with Dan about it, we seem to think it's better to not use
> the ground plane for the return signal,
Just for clarity sake, in this particular area there is not ground 
plane.  Just the ground plane layer.  If I had zoomed out, you'd see 
lots of copper in other areas.
  and route the return the same
> way you route the audio.  Think of it like a differential pair.  That
> way, you get current balancing without breaking up your ground plane.
> Also, avoiding vias helps ;-)

We're on the same wavelength - I am considering that as well.  But like 
I said before, if there's a shorter path, the low frequency signal will 
take it.  So if you are suggesting a diff-pair sort of arrangement 
*over* a ground plane, then I don't think it's a good idea.  Routing the 
diff-pair approach with no underlying ground plane is ok though.
> 


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