Oznog
Active Member
zachtheterrible said:I hope that this change won't screw anything up when i put it on a PCB.R1 would likely cause problems the way you have it mounted on the board. 33mOhm is pretty low and the contact resistance of the board is probably higher than that, inconsistent too.
No your PCB will be fine, though don't return the main current through ground through the same trace leading onto the ground pin of the chip. Of course this is already a pretty inaccurate circuit so it's not really anything to worry about. Soldered connections will not have resistances on the order sometimes possible with the protoboard. And the protoboard is hard to predict, you could have a great connection on one pin and a lousy one on another. Or it may heat up and change temp. No prob for most jobs but a 33mOhm current sense is a special issue.