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 speed levels can be set. Mc33039 by mc33035 and chip design.