> However using 1N400x in parallel is a curious thing for an old > capitalist... > :) The diodes are in 2 rows of 8 but are not electrically parallel. They form 4 full wave bridges. Others: Peak DC in is approaching 200 volts. Schottkys tend to get rare and dear as voltage rises. Larger diodes (eg 1N540x) would be happier. But they take more room and cost (slightly) more - and are not already there ;-) As all 4 bridges feed a common rail the suggested heatsinks at one end can be retrofitted to the existing design and may be worthwhile. RM -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist