Originally Posted by Spitlebug
Can you run a potentiometer in this thing to have it spin faster?
To make it spin faster you add more voltage. I am running mine on a custom 12v pack. You can use up to 15v with this circuit. You can use a potentiometer to slow it down from there.
The potentiometer would go to the Base pin of the transistor to lower the voltage that drives the transistor and thus the motor.
Let me know if you want help adding this.