>Hi,
>
>Tried the freeware version of Eagle (W950. Seems to be relatively easy to use
>and rather capable.  It never  crashed. Quite unusual for W95
>software.
>
>On a different note. How do can I calculate the minimum width of a track
>if I know how much current it has to carry? (I know the math, but I
>would prefer a rule of tumb).
>
>Regards,
>Michel

If you can find a copy of

  Reference Data for Engineers: Radio, Electronics, Computer,
  and Communications, Seventh Edition

  H.W.Sams, 1985 ISBN 0-672-21563-2

There is a graph on page 5-27 that shows temperature rise vs. current for
several width/weight combinations.

Reg Neale