Have you ever had a noise-sensitive circuit and tried to find the noise source? Even after you completely encased sensitive portions in all sorts of shielding, you still had noise? It’s very possible this is magnetic noise. Lower frequency magnetic fields can’t be contained and shielded against in the same way electric fields can. In this presentation, hear about the author’s nine-month long battle with a specific magnetic noise issue, the best tools to fight it, twisted pair, current loops, and the best ways to test for and defeat magnetic noise in your designs. New this year is more on how electric fields compare and some general shielding examples.