> Makes me wonder how consumer electronics people lay their single sided
> phonic PCB's out with soo many jumpers ;)
As a hobby, I occasionally repair/restore consumer electronics. From most
consumer electronics SS PCB's I've seen, I'd say that they are hand-drawn.
No PCB CAD program I know of would generate such odd shapes for copper
regions. Everything in consumer electronics is optimized to be cheap,
cheap, cheap. Even to the point of leaving as much copper on the PCB as
possible, to reduce copper contamination of the etchant.
Perhaps Protel should work on a SS design feature that would let you
designate one side of the board as jumper tracks only. A design rule could
be added to control jumper length increments and jumper wire guage. After
routing, the number, guage, and length of jumpers would automatically be
added to the BOM. And also maybe a bezier curve hugging algorithm for
routing tracks and pouring copper on the copper side - this would give it
that hand-drawn look and save etchant.
Best regards,
Ivan Baggett
Bagotronix Inc.
website: www.bagotronix.com
Kathy Quinlan wrote:
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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