Ok so my voltage source is a external DC Supple, that gives an output of 12V 1.5 Amps. That drives a DC Motor. I want to control the Speed of the DC Motor, however when i connect positive to terminal B, and output to C, The motor does turn on until i reach fully clockwise, and i see a spark, i know thats bad, so i wanted to know how will/can I control the speed of the DC Motor? With a different Pot? The pot I am using is a B10K Pot. Thanks!