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@moria.seul.org > > http://www.seul.org/cgi-bin/mailman/listinfo/geda-user > > > > > > > > _______________________________________________ > geda-user mailing list > geda-user@moria.seul.org > http://www.seul.org/cgi-bin/mailman/listinfo/geda-user > > _______________________________________________ geda-user mailing list geda-user@moria.seul.org http://www.seul.org/cgi-bin/mailman/listinfo/geda-user