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Thread: Current on a PCB
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face BY : Dan Michaels email (remove spam text)



Richard Ottosen wrote:
....
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Richard,

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
oriented].

best regards,
- Dan Michaels
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