The driver is suitable to 5 phase stepping motor. It uses bipolar constant current driving method, its rated driving current is 1.4A/phase, and it can accept AC 110V, 60Hz power source directly. Except that, the driver includes lots of advantages as following: low noise, large torque power, precise action control and so on. We use photo - coupler at input port to isolate the noise and design a special socket at I/O port to achieve user - friendly.