Worth at least a skim by anyone interested in designing or repairing almost anything electronic or in buying low cost 'bargain' electronic products* - either in small quantity or for resale. Many will find it worth reading in more detail. (Most of us could learn quite a lot from this man). An extremely worthwhile account of one man's extended efforts to turn a piece of badly designed badly & incompetently assembled rubbish into the pure sine wave 3.5 kW 12V to 230 VAC inverter that it claimed and initially appeared to be. http://ludens.cl/Electron/chinverter/chinverter.html The account is 'fun reading' in its own right for electrical engineers and their ilk BUT is also an extremely good study on how and how not to design and build things, what goes wrong, what it takes to turn a number of a good design concepts into bad ones and more. Russell * Taiwanese in this case, and such products will usually be Asian sourced due to the cost aspects, but applies to product from almost anywhere. Very broadly, Taiwanese products on average tend to be better than mainland Chinese ones, but this demonstrates how bad an apparently functional Taiwanese product can be. --=20 http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .