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I'm not experienced PCB designer - but even they saying "These tips are not specific to using our CAD software, but instead.." it seems to me, that those instructions are very much made for doing layouts:

A. Without prior netlist (ExpressSCH was introduced in -02)

B. For doing Double-sided boards..

Let's say, that Double-sided boards are "forgiving" for stupid component placements you end up with if you can't see "rastnet" while doing it ;) Just place via here and there :P

It's a different thing altogether doing a single-sided board and having a continuous fight agains "jumper wires" or whatever.. As I can always SEE, what signals or nets are not yet routed I can and DO optimize component placement - and yes, it doesn't stop even with fully routed board ;)

Bye, Moebius

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If they say so ;)

There's a nice calculator: http://www.desmith.com/NMdS/Electronics/TraceWidth.html

and here's the other one, giving slightly different results ;) http://www.geocities.com/CapeCanaveral/Lab/9643/TraceWidth.htm

As you can see, there's no "big mystery" behind it. Smaller traces will carry same currents as larger ones, but as having bigger resistances, will also warm up more. There you can also calculate trace clearances for different voltages..

There are some interesting articles at the source: http://www.ultracad.com

...But to the original topic: Download pdf from here:


It's an excellent "paper" ;)

There's also lot's of useful information scattered around http://www.epanorama.net

Bye. Moebius

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