Re: gEDA-user: Blind & Buried Vias

[Neil Webster <nwebster@xxxxxxxxxxx>]

Hi Steve,

Sorry I should have described things better. The non-component side of
the board has exposed pads that make deliberate contact with the body
for a couple of selected nets on the PCB. All other nets on the PCB (eg
power) can not be exposed on this side of the board. I had considered
using tented vias to selectively isolate certain vias but I am concerned
that this thin insulation layer could scrape off and expose the via.

Regards, Neil

  
On Sat, 2008-06-07 at 13:54 -0700, Steve Meier wrote: 
> Neil,
> 
> If the requirement is not to have the board not make electrical contact
> with skin, why not put an insulator on the back of the board? There are
> various types of tapes and even sprayes that can be used to encapsolate
> one or both sides.
> 
> Steve Meier
> 
> Neil Webster wrote:
> > Hi all,
> >
> > I have an application where I am creating a small PCB as the basis of an
> > active electrode. The non-component side of the board is in contact with
> > skin and exposed vias on this side of the board therefore must be
> > avoided. In the previous generation of the design, the circuit was
> > simple enough to allow me to perform routing purely on the top surface.
> > However the new design is significantly more complex and I think I will
> > need to move to a multi-layer board. I therefore need blind vias.
> >
> > The official PCB documentation says that these are not supported.
> > Extract from section 2.2: "Each via exists on all copper layers. (i.e.
> > blind and buried vias are not supported)"
> >
> > However I did find a number of threads on this topic in the archive, one
> > of which is referenced below. However this was almost 1 year ago and
> > there may have been further developments.
> >
> > http://www.seul.org/pipermail/geda-dev/2006-July/000135.html
> >
> > Is there any way to achieve this with "pcb"?
> >
> > Regards, Neil
> >
> >
> >
> > _______________________________________________
> > geda-user mailing list
> > geda-user@xxxxxxxxxxxxxx
> > http://www.seul.org/cgi-bin/mailman/listinfo/geda-user
> >
> >   
> 
> 
> 
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> 
> 


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