Using traces as resistors

A while ago I needed some small value resistors as current shunts and I started wondering about the feasibility of using traces as resistors. There are many theoretical reasons as to why copper traces make bad shunt resistors, but I found surprisingly little practical data. So with my next OSH Park order, I threw in a small test board: The traces are (from left to right): - 20 mil wide, 1221 mil long, shoul ...

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