here are the links: Minarik DC PWM regenerative variable speed drive NRG02
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Minarik DC PWM variable speed drive XP02-115AC
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I also have a new Minarik DLC300, which is a tachometer/feedback control unit with a programmable display - the XP02 has instructions on how to connect it to the DLC300, so you can measure FPM or something and control the motor to hold that value to your setpoint. I'll list it a little later.