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I've been looking at them for a bit wondering the same question. I believe:
When the switch is closed, the inductor will have a high resistance, limiting power directly from the main power source. During this time, the capacitor will be delivering voltage to the output.
When the switch is open, the inductor will power the output while recharging the capacitor.
From what i get it's not *necessary*, but does even out the voltage considerably.
Maybe someone has a better answer...
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∙ 10y ago
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