无刷电机驱动电路。非常可靠的电路设计原理图。protel 99se 格式的原理图。已经在工程上使用。安全可靠。可以设定四个速度等级。采用 mc33035 和mc33039 芯片设计的。-Brushless motor drive circuit. Very reliable circuit design schematic. protel 99se schematic format. Has been used in engineering. Safe and reliable. Four sp