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RE: "The 1st filter cap. can't exceed 20 mF"

You didn't dig hard enough. ;>) Mouser stock # 598-81LX330M450H012 is a 33 μF./450 WVDC snap in part that happens to be 105o C. rated too. :>D Two of those in series will be just fine for the 1st cap. position, when fed by a "potato masher" 5R4.

BTW, if you add a NTC inrush current limiter between the rectifier and the 1st filter cap. position, you rate to be safe with 2X 47 μF. parts in series. Start up arcing has to be prevented. Once that's been accomplished, a few extra 1st position μF. are just fine.

edit: added NTC remark

Eli D.



Edits: 05/21/12

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  • RE: "The 1st filter cap. can't exceed 20 mF" - Eli Duttman 17:29:50 05/21/12 (3)

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