Original poster: "David Trimmell" <humanb-at-chaoticuniverse-dot-com> Dan, your parts list specs the IXFN44N50 as the MOSFET, a 44A, 500V N-Channel one. How difficult will it be to use a less expensive one? I don't see pushing the boards much over 2.5 KW, so they're a bit overkill, no? Toobs make sense to me, but I still trying to get this SMPS stuff. Regards, David Trimmell