AC Motor Speed Controller using U2008B

Rajkumar Sharma  
Project 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



6 Response on “AC Motor Speed Controller using U2008B

  1. 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?

Leave a Reply

This site uses Akismet to reduce spam. Learn how your comment data is processed.