| 摘要 |
PURPOSE:To provide a rotational speed control circuit for a motor in which the relationship between a manual operation amount and a rotating speed of the motor can be made substantially linearly irrespective of a rising delay of a supply current due to a self-inductance of a motor coil and hence a regulation of the speed can be facilitated. CONSTITUTION:A control signal having a duty width corresponding to a manual operation amount of an operation unit 44a is output from a rotational speed control circuit 40 to a driving circuit 10 for a motor M. The circuit 40 has regulating means 44 for so obtaining an operation amount-duty width characteristics as to reduce a variation in the duty width per unit operation amount of the unit 44a upon increasing of the duty width. |
