Can I use a 20Kohm variable resistor instead of the 100Kohm that comes with it? Also, what is the function of the extra 25v 100uf capacitor that is laying over the circiut board, is it for extra start up power?
About #200303, we have updated version, so we are not sure which one you are talking about. Please check whether it is this one. https://www.amazon.com/dp/B07D9B6J78
You can use 20K,but this item is brushless sensorless motor controller, there is no way to make it work with hall sensors.