Re: Reservoir capacitors and ripple current.
LC smoothing used to be a favourite method of reducing ripple in the days when wound components were not ridiculously expensive. As kalee says if the Q at the resonant frequency is high, there is a tendency to ring particularly if there is no load. LC power supplies in which the load was either there or not or varied widely, there was usually a power resistor to draw sufficient current under all load conditions in order to suppress ringing.
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