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Hi, I want to ask how to do the air gap for a E type ferrite core, by myself? I know the stock ferrites can be order with the air gap already made, but it is not an option for me, as my supplier has only non-gapped cores. The stock gaps are in the middle leg, but I have seen DIY project using...

Hi everybody, I'm new to the forum and I'm building a 2+ kW VFD to control a 3-Phase AC induction motor (ACIM). Now I'm struggling with the PFC that will rectify the input AC (230V rms) from a single phase grid. I have stopped at a NCP1654 for the PFC controller and think the basics are quite...