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For protection against electromagnetic interference, filters can be used as well as suppression capacitors. Such filters consist of combinations of resistors, inductances and capacitors. SMD filters can be mounted directly on to circuit boards; they protect sensitive components against radio-frequency interference. Pass-through filters are used in AC circuits for suppression of interference on output conductors and input conductors, for instance for the power supplies of navigation instruments, electrical machines and systems. In addition, they suppress EMC interference in high-performance processors.

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