Recent content by hjf2013

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...

I'll go and take pics later (the smps is in the lab and i'm at home) but there's not a lot to take pics of. The PCB only holds the transformer and viper22 IC and a few components. the feedback circuit are just soldered "in the air". Here's a pic of the transformer (before i cut all that excess...

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...