本电路是采用Multisim7模拟的四相八拍微型步进电机的驱动电路。将步进电机的A,B,C,D4相绕组接入电路中的四个输出端，在STEPIN端输入方波信号，根据步进电机的原理可知步进电动机即可旋转。由于由STEPIN输入方波后调整运算后输出信号进行放大后驱动步进电机,所以可以得知旋转的转速与输入方波的频率成正比。

-The circuit is simulated using the four-phase 8 Multisim7 film micro-stepping motor drive circuit. The stepper motor A, B, C, D4 winding access to the four output circuits, in STEPIN ended input square wave signal, according to known principles of the stepper motor stepper motor can rotate. As the input square wave from the STEPIN adjustment operation after the output signal amplified drive stepper motor, so you can know the speed of rotation frequency of the input square wave is proportional to.