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EMI filter

Electromagnetic interference (EMI) refers to any undesirable electromagnetic emission or any electrical or electronic disturbance which causes an undesirable response, malfunctioning or degradation in the performance of electrical equipment. Electromagnetic interference propagates through conduction over signal and power lines, and through radiation in free space. Electromagnetic interference (EMI) is created from mutiple sources such as lightning, rain, televisions, power transmission lines, ignition systems, fluorescent lightning, radar transmissions, electric car chargers, and computing devices. Electromagnetic interference (EMI) disrupts the normal operation of electronic equipment such as power supplies, electromechanical devices and computer systems. For a computer system, such an electromagnetic disruption may be caused by its external cabling, power supplies, electronic components, signal transmission paths, printed circuit boards and the like. EMI filters are often used to attenuate electromagnetic interference. EMI filters are typically placed on input power lines of electronic equipment so that high frequency electromagnetic noise does not enter or escape the equipment. The EMI filter may be used to suppress the interference generated by the device itself, as well as to suppress the interference generated by other equipment to improve the immunity of a device to the EMI signals present within its electromagnetic environment.

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