rdrast
Lifetime Supporting Member
Honestly, if you really want to use an ultra-cheap, 0-10VDC input, proportional output control, use a simple fractional horsepower Minirik DC Drive. You can probably find a cheap DC drive that can run directly off of 120VAC, deliver 0 to 90VDC at 5 or 10 amps that costs under $75.
It's also much safer for a classroom enviornment, as there are no bus-caps that remain charged after the power is disconnected.
It's also much safer for a classroom enviornment, as there are no bus-caps that remain charged after the power is disconnected.