Re: gEDA-user: Blind & Buried Vias

[Steve Meier <smeier@xxxxxxxxxxxxxxxxxxx>]

Neil,

Another way to do this is to break your design up into two boards or two
sets of gerber files and then combined the two sets of gerbers into one
complete set.

The first set would have your top layer and all routing layers on it.
The second set would contain your bottom layers. You will have to hand
edit the cnc's move the vias that you require to punch through from the
top to the bottom to the second set.

Steve Meier

Neil Webster wrote:
> 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
>>>
>>>
>>>
>>> _______________________________________________
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>>> geda-user@xxxxxxxxxxxxxx
>>> http://www.seul.org/cgi-bin/mailman/listinfo/geda-user
>>>
>>>   
>>>       
>>
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>>     
>
>
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