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.

双回转构的进制路由TDA1521音频集成功率放大器组成平衡桥式功率驱路，由计算并行口经过锁存器构成脉冲分配器。

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

阐进驱原理和方法,并设计出一种进的驱路。

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

采用新型进调整构及真正不停调整计量构。