gEDA-user: sparkfun 4 layer boards

[DJ Delorie <dj@xxxxxxxxxxx>]

Just got my boards back.  Yes, it was a long time, but they're new
with the 4 layer service and don't yet have the volume to fire off
boards at quick intervals.  Hopefully the schedule will improve ;-)

Anyway, image here: http://www.delorie.com/pcb/sf4l-1.jpg

Of the boards I got, the quality varied.  The above is the worst of
seven otherwise identical boards.  On the best, the mask and silk were
perfectly placed, but on this one the mask was 3 mils to the right and
the silk was about 5 mils to the left.

The via is a 31 mil copper with 15 mil hole.  The IC is 0.65mm pitch.
The traces are 8 mil (although they can do 6/6 in 4 layers).  The
broken mask bridges are only 3 mil wide, so no surprises there.

Overall, I'd say the quality was almost as good as the other fabs I've
used, so if you have a small 4 layer board to make and plenty of
patience, sparkfun (batchpcb.com) is an option.  Under 10 sq inches
it's cheaper than pcb-pool.

DJ


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