AC Motor Speed Controller using U2008B

  • Rajkumar Sharma
  • 20129
  • medium
  • Tested


This low cost current feedback phase control AC motor driver based on U2008 IC, The U2008B is designed as a phase control circuit in bipolar technology. It enables load-current detection as well as mains-compensated phase control. Motor control with load-current feedback and overload protection are preferred application.


  • Supply In-put:  230V AC
  • Load: Up to 500W (Triac Required Heat sink for Higher Load)
  • Jumper J1 Selection: A-Load Current Compensation or B-Soft Start
  • PR1: Preset for Phase Control ( Ramp Current Adjustment)
  • P1 : Potentiometer Set Point



Parts List




  • Ajay Desai

    I would like to know the cost of this kit and it’s availability details.

    1 year ago
    • admin

      How many pieces of this kit do you need? You can also check on for kits of our projects.

      1 year ago
      • Ajay Desai

        I need about 25 pieces. It is not available on koteq. Let me know availability in Hyderabad

        1 year ago
        • admin

          Unfortunately the IC isn’t available and we cannot sell this kit.

          1 year ago
  • Marcel

    Soft start does not work properly even with resistive load. Counter-effect. It starts at full speed and then turns to the set value of P1. Direct launch does not work at all. Could the problem be in U2008?

    1 year ago
  • this schematic isnt for load current compensation… if you look at scheme in datasheet, you ll see that its for soft start

    1 year ago

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