common mode choke

  1. Inductance need of common mode choke

    I got a damaged ATX PSU with primary transistors (13007) blown. When opened to repair I found that it doesn’t have EMI filter (markings present on pcb). I decided to include one and designed as attached pic. As not an expert I’m not sure about the required values of X caps and inductors. The...
  2. B

    Mutual inductance and coupling coefficient

    Hi, Does anyone here knows how to measure the mutual inductance and coupling coefficient for small values inductors? I have succeeded to do that for one common mode choke using an LCR meter, where the L1 and L2 where 4mh, for another choke (where L1 and L2 are 1mH) i have got a coupling...
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