Limit MC-60 controller output
If you just want to limit the range of the controller output to a safe value by preventing the pot being turned up to far then a resistor will probably suffice.







simulate this circuit &ndash; Schematic created using CircuitLab

Figure 1. Modification.

Make R2 about three times the value marked or measured on the pot to reduce the range to 0 to 1/4 maximum.


  How can I do this? By adding a resistor to the output of the speed control potentiometer?


Note how we modify the maximum voltage of the potentiometer rather than "adding a resistor to the output".