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I'd like to replace the potentiometer on this motor controller, motor controller , with a mosfet to be able to control it with arduino, is this possible? The pot in that controller is 1/2w and 100k Ohm.
What Nigel failed to mention – on the digipot he linked and in fact on many digipots, the resistance terminals are limited to the supply voltage of the chip, which is 5 volts in this case.
Without understanding the power supply circuit, this digipot probably won't work. There are a limited number of types that will handle more voltage, but you'd have to do some experimenting to figure out the range needed.