> Other than that, get a reference that tells you the resistance of PCB
> traces depending on various values, and make a PCB trace the right
> length for the resistance you want (Eg. the 5 milliohms that Sphero
> mentioned

I wouldn't do that.  The thickness of PCB traces varies too much.  Most PCB
houses will only guarantee a minimum thickness, but not a maximum.  Also,
20A is a lot for a PCB trace.  It can be done, but you need to think about
it a lot more than other traces.


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