Website Visitor wrote:
I want to auto-route a pcb in PROTEL ,on which there will be routing only at
bottom layer and jumpers on the top layer, but i want to have only straight
jumpers,horizental or vertical both are acceptable, so how i can do it, i am
using protel-99-sec edition, please guide me.
my email is: [EMAIL PROTECTED]
thanks
OK after having worked with Protel for over 15 Years now (I started on
the autotrax layout for DOS (hmmm I am showing my age). And having alot
of LOW END customers who could not afford DS with PTH, I have found the
only way to route these boards is BY HAND (hell I route all my boards by
hand as it is easier, quicker and less problematic than setting up the
auto router (maybe I am too old fashion))
I find 2 styles of jumpers get used the most, one is a wire link (which
I do with a via each end and a trace on top (with lots of fab notes so
that the factory does not try to make DS boards) or I place 0R TH
resistors. A 0.4inch resistor can clear a fair few traces, esp if you
use an orthogonal pad with the longer axis parallel to the traces you
are jumping.
The reason I prefer resistors, is that it allows Protel to SEGMENT
things like power nets, this makes fault finding easier at a later date,
as you know if you remove resistor 101 that VCC is now VCC A-E and VCC
F-H, if the short is on the later segment etc you can narrow down
without having to remove lots of components (hmmm I think I am paranoid
from having too many tantalums go short on old designs.....
<OT>
Those were the days good ol' Z80 S100 buss systems with a great handful
of 10uF 6.3V tag tants all over the place.....
</OT>
Short side is no for auto router, but yes you can do it yourself :)
Makes me wonder how consumer electronics people lay their single sided
phonic PCB's out with soo many jumpers ;)
Regards,
Kat.
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