Thank you Olin, I'm aware of the copper thickness tolerances and was planning to verify it = with=20 my micrommeter and maybe conduct some final resistance tests. It's not a real critical application, I just want to set a rough boundary t= o=20 device currents. Regards, Marcelo Fornaso from Buenos Aires ________________________________ From: Olin Lathrop To: Microcontroller discussion list - Public. Sent: Mon, February 28, 2011 10:52:08 AM Subject: Re: [EE] Copperclad shunt Ing. Marcelo Fornaso wrote: > I barely remember about a website with instructions to print a > current shunt on your copper clad board, with calculus for length, > width, corners, etc., taking into account copper thickness, current > requirements, resistance. power dissipation and the like. Advanced Circuits used to have a trace size calculator from which you could get resistance among other things. However keep in mind that copper thickness is usually not that well controlled. The board house guarantees = a minimum but usually not maximum. Copper also doesn't have such a great temperature coefficient. ******************************************************************** Embed Inc, Littleton Massachusetts, http://www.embedinc.com/products (978) 742-9014. Gold level PIC consultants since 2000. --=20 http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist =20 --=20 http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .