数字速度控制开关率15khz ！
我个人并没有内置任何速度控制器与扭转，但有人问我如果数字速度控制上文所述可以修改有反向功能。
I personally have not built any speed controllers with reverse, but I have been asked if the digital speed control described above could be modified to have the reverse function.
举例来说，步进电机需要输入一系列数字脉冲信号来控制电机的位置和速度。
For example, a stepper motor requires a series of digital pulses as an input to control the motor position and speed.
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