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.
双回的步进电控制电路由TDA1521音频集功率放大器组衡桥式功率驱动电路,由计算并行口经过锁存器冲分配器。