BIQU TMC2209 V1.2 is an ultra-silent motor driver IC for two-phase stepper motors, it supports STEP/DIR and UART two working modes<br />TMC2209 run much cooler due to a large-area cooling pad which provides a current dynamic regulation technology that saves up to 75% of electrical energy<br />Adopts stealthChop2 ultra-quiet technology, it is quieter than any other driver like A4988, DRV8825, LV8729, Reducing the sound of your 3D printer considerably, even you can sleep right next to this printer at full speed without any disturbance<br />Potentiometer regulation instructions: First, rotate the potentiometer clockwise to reduce the Vref voltage. Second, rotate the potentiometer counterclockwise to increase the Vref voltage ">