Where could I find some good information on designing inductors and transformers for switch mode power supplies? I want to wind my transformers or inductors from scratch. For example, I have a bunch of #26 iron powder toroid cores from slaughtered PC power supplies. Are these suitable for building inductors for buck and boost type switching regulators? Adi -- http://www.piclist.com hint: The list server can filter out subtopics (like ads or off topics) for you. See http://www.piclist.com/#topics