I have attached a 12v DC electric drill moter to a fishing pole. I need a 12v dc motor controler or PWM that will allow me to cut the rpm's down from 550 rpm to about 20 to 100 rpm. less then 20 would work better for bottom fishing. I believe a PWM would work but I am not sure as to a schematic I can use to build one. Any ideas or input would help. I am not wanting to buy something. I want to build it with my son. it's our project together. thanks for the help. Just F.Y.I we are makeing this so I can go fishing independtly I only have the use of 1 arm.