Table of Contents Why Call EMI Filters Black Magic? Source Impedances of Various Power Lines Various AC Load Impedances The DC Circuit-Load and Source Typical EMI Filters: Pros and Cons Differential Mode Components Common Mode Components Electromagnetic Pulse and Voltage Transients What Compromises the Filter? Waves as Noise Sources Study of the Off-Line Regulator Initial Filter Design Requirements Review of A Matrices Filter Design Techniques Matrix Applications Applications Using Round or Square Conducting Rods Packaging Information Questionable Designs Review of Filter Design Glossary