Original poster: "David Huffman by way of Terry Fritz <twftesla-at-qwest-dot-net>" <huffman-at-fnal.gov> For a full wave (6 diodes) three phase power supply the ripple is fairly low. The % ripple in RMS / average output voltage is only 4.2%. The ripple frequency is 6 times the line frequency. I just wish I had 3 phase coming into my home. Dave Huffman