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RE: Most likely it is that first 50H choke.

For a "quick fix", you could insert an additional filter stage, CR after the rectifier and before L1. This way use the R to drop voltage instead of making L1 act as choke input.

C could be, say, 47uF, that way by the time L1 sees anything the ripple will be quite low already.



Edits: 02/21/17

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