Current on a PCB
Dan Michaels email (remove spam text)
Richard Ottosen wrote:
Having seen a few pcbs with this type of "indicator" [ie, fried traces],
I have to agree with you. My general approach [which may not be the
best of all possible worlds] is iterative. I figure it takes a couple
of cuts to get it right [others may disagree here].
As I alluded to above, I would measure or estimate the max current
to be conducted by the trace, and look in the table and select a geometry
that would provide "at least" 2-3x safety margin. More if allowable.
This is also how I choose resistor wattages, among other things.
I personally would not design any closer than that to the ragged edge.
Then, build it and see how it goes. Next cut may need adjusting in some
cases. [Is this approach too imprecise?? - I'm sure there are different
tribes of opinion here - things like "safety margin" are opinion
- Dan Michaels
See also: www.piclist.com/techref/pcbs.htm?key=pcb
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