L 297芯片产生脉宽可调的脉冲相序信号，该信号作为双极性桥式功率驱动电路的输入信号，放大后驱动步进电机。
L297 chip generates pulse phase sequence signals of which the pulse width is adjustable. The signals are the input ones of dual bridge driving circuit and drive the stepper motor after amplification.
分析了出土古脉书在脉名的选择与脉序的安排上，受到了三部九候说的影响。
It further points out that the arrangement of channel order, and selection of channel title were all influenced by the theory of "Three Parts with Nine Palpation Sites".
应用推荐