I found one!
http://www.bobblick.com/techref/proj...wm/sv2pwm.html
Bob has a really nice Decoder, I've built two so far with only one working. after a few hours it died too. I suspect that it was due to a horrable soldering job.... Making a new one with SMT caps tomorrow, and I've also changed my double sided board to a 95% single sided board design to reduce faluty soldering jobs. I've also stopped using the LMD18201 as BOB'S design works directly with an H Bridge. LMD18201's costs about 15 dollars
I'll report back with some results in a couple of days.