Go to my web page here for details on this build.
http://el34world.com/Misc/Cnc/Treadmi...

I built a motor speed control circuit to drive a MC2100 motor speed control circuit board. Unlike the MC60 speed controller, the MC2100 needs to receive a pulse from an external circuit. That circuit is inside the main control panel on the treadmill. The MC2100 board will not work without a circuit that pulses an opto isolator.
Thanks to Terry for his MC2100 circuit info. I used his info to build my circuit.
https://www.dropbox.com/s/3ous60tvart...

Note: I do not make these treadmill control boxes
I only made this one for me to get my can crusher working.
Please do not email me and ask if I can build you one.