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.
双回转机构的步进
机控制路
TDA1521音频集
放大器组平
桥式驱动路，计算机并行口经过锁存器构脉冲分配器。
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