I've been trying to work out a good, cheap DC motor controller - I think I've got it!
So I've been looking and looking at power supplies, motor controllers, and the like and seen a few references to using a dimmer switch for lowering voltage and bridge rectifiers for converting AC to DC. Well I just happened to score on a whole lot of bridge rectifiers rated for 1600 volts and 25 amps (more than I will ever need!) so I threw a few things together to try them out...
I have a lot of bridge rectifiers left - Go here to get some!!!