I'm in the process of researching current power supply technologies to create a robust bench supply for my father. My dad is an rc quad copter enthusiast and enlisted me to create him a supply. His requirements are 13-48v with a max wattage of 1200w. Can anyone recommend any good reading materials on switching designs? I'm also reading thru rsw's thesis as well. In an ideal world I'd like to make the supply modular and also have built in freq width/delay speed control. I'm also looking to build a 6 amp dc supply for my solid state peltier experiment (currently using an old dell ps, but this isn't very portable...lol) -Chris. -- -- -- -Christopher Olesch *"Affordable IT Services for Non-Profit & Small Business"* || http://www.ngotechnology.org/ || http://www.linkedin.com/in/chrisoleschjr *Masonic Affiliations:* || http://www.scottishritechicago.org || http://www.supremecouncil.org/ || http://www.ilmason.org/ *Online Artistic Portfolio* || http://cjolesch.deviantart.com/