Linear is fine, Mike's circuit pretty much sums up what I'm looking for, an op amp fed from a DAC or PWM source using a current sense resistor from the fet. I have a few 1 ohm resistors and an ompamp that iwll give me more than enough voltage. 0-12 maybe though I'd be intersted in any additional circuits you'd like to post. The FET I have can handle 20+ watts and I have heatsinks so at 12-20 volts 1amp even under short circuit conditions isn't gonna hurt anything. I've done a similar circuit to mikes using a POT instead of a DAC, but I was looking for any other methods people can post.