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Re: gEDA-user: Compiling MMI (electromagnetic simulator)

Karel Kulhavy wrote:

I am trying to determine how wide a trace must be to have impedance of
50, 75, 93, 100 ohm and also how much capacitance per length my ordinary traces
will have.

for simple configurations you might as well just use a calculator, but here's a tool (UltraCLC) that I've used in the past:

http://www.eskimo.com/~ultra/calc.htm

There's also an article that'll give you the formulas:

http://www.eskimo.com/~ultra/formula.pdf