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The manufacturer's data sheet actually recommends using two capacitors with any 3-terminal regulator in the 78xx family: a 0.33µF on the input and a 0.1µF on the output.

  • the input capacitor functions mostly as a filter capacitor
  • the output capacitor functions mostly as a decoupling capacitor
However both capacitors should be ceramic capacitors (to reduce parasitic inductance in the capacitors) so that they can operate efficiently at the high frequencies resulting from rapid circuit switching in the load (especially if the load consists of digital logic).
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11y ago

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