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I found this interesting article on SMPS EMI noise and reduction: http://www.eet-china.com/ARTICLES/2000DEC/2000DEC08_AMD_AN8.PDF?SOURCES=DOWNLOAD It's the basic stuff (basically X1 and Y1 caps everywhere). Which raises the question: how much power does one need to be handling to worry about...

Hi! I'm designing my first off-line SMPS. I decided to use ST's Viper IC which are cheap and easy to find, but the main reason is, ST provides free tools for designing your SMPS. On their website there's a calculator where it tells you everything, even the transformer you need (it lets you...