This is a video tutorial about DC motor speed controller using power op-amp. This video shows how to control dc motor speed using power op-amp. In this video the op amp is configured in non-inverting configuration. When the power supply is on, the LED will on and when the potentiometer is turned, the speed of dc motor will gradually increase. The higher voltage will produce higher speed on DC motor. we can use two 9V batteries as the power supply. Here is the video: