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A fundamental electronic component that stores energy in an electric field, commonly used in filtering applications.

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The capacitor is there to absorb noise coming from the motor, which otherwise would mess with your power supply. 100nF is a very low value, however. Depending on the motor's power I would use 10uF to 100uF, but also leave the 100nF in. …
answered Aug 26 '13 by The Resistance