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A capacitor, usually ceramic, used to provide instantaneous energy to a local circuit.

221 votes
17 answers
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What is a decoupling capacitor and how do I know if I need one?

What is a decoupling capacitor (or smoothing capacitor as referred to in the link below)? How do I know if I need one and if so, what size and where it needs to go? This question mentions many chip …
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