Good info here: http://sci.tech-archive.net/Archive/sci.electronics.design/2005-02/5165.html
But that was 2005, this is 2009, and UPSes using stepped square waves come with $10,000 equipment warranty. So have things (like design issues) fundamentally changed? Jeff -- Jeff Lasman, Nobaloney Internet Services P.O. Box 52200, Riverside, CA 92517 Our jplists address used on lists is for list email only voice: +1 951 643-5345, or see: "http://www.nobaloney.net/contactus.html";
