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Filter capacitors smooth out the pulsating DC. Without the capacitors, the pulsating DC drops to zero at the AC crossing point, unless it is a three phase rectifier. Sometimes, that is sufficient. Sometimes, they are followed up with a regulator circuit that further stabilizes the DC.

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13y ago
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12y ago

Filters are used to remove, or reduce, the ripple in the voltage waveform that would otherwise be present if the output was taken directly from a rectifier.

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Q: Why the filter used in rectifier circuit?
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