Superb 30 page Nichicon document covering every aspect of wet electrolyte Aluminum electrolytic capacitors. Provides extensive details of manufacturing process and a wide ranging discussion of the technical aspects affecting performance, lifetime, reliability ... . Probably the best treatment in 30 pages on this subject that I have seen. http://www.nichicon.co.jp/english/products/pdf/aluminum.pdf Russell -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist