Repository of Linear Technology application notes plus a brief summary of each http://www.linear.com/pdf/ANreference.pdf Essential resource for anyone working with linear electronics. Even if you know it all, a skim of the topics may be revealing. eg Did you realise that ceramic capacitors at the input of a power supply can themselves generate a transient of twice the supply voltage? AN88 http://www.linear.com/pub/document.html?pub_type=app&document=91 Russell McMahon -- http://www.piclist.com hint: The PICList is archived three different ways. See http://www.piclist.com/#archives for details.