To control stepping motors, the balance bridge power drive circuit is made up by TDA1521 integrated audio power amplifier, the pulse allotter is made up by the parallel ports of computer and latches.

双回转构的步进电控制电路由TDA1521音频集功率放大器组桥式功率驱电路，由计算口经过锁存器构脉冲分配器。

The driving principles and methods of step motor are introduced in this article and the stepmotor driver circuit is increasingly designed.

阐述了步进电驱原理和方法,设计出了一种步进电的驱电路。

It features new type stepmotor control system and real metering mechanism adjustable without shutdown the machine.

采用新型步进电调整构及真正不停调整计量构。