Originally posted by DougLA
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In my opinion the second best option for DC motor control is an MC 60 control board found in older treadmills.
A few years ago the DC 51 controllers worked just as well as the MC 60, but they are not the same now and function okay for small motor projects. I never had any luck using an scr with bridge rectifier, but it was only rated for 400 watts when I tried it.
The 1/2 HP motor may be a little underpowered, but it is 1725 rpm, so the low range is 0 to ~800. It seems to have plenty of torque. If I had a 1 HP I would have used it.
The huge advantage of treadmill motors and controllers is that they are free, a big consideration if resale is the goal.
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