In summary, electromagnetic noise is all around and it is important to reduce the noise emitted from the devices so they do not interfere with each other. KEMET offers an extended portfolio of common mode, differential mode, and dual mode chokes along with input and output capacitors for a power supply. The structure of an AC line filter is a coil, which is the copper wire winding around the magnetic material. What characterizes its performance is the magnetic material, such as a ferrite. KEMET conducts everything from development to production of magnetic materials and can use the most suitable materials for AC line filters. KEMET offers a broad line of ESR and ESL capacitors for power supply design.