| 摘要 |
A rotational speed control circuit for a motor capable of restraining generation of switching noise and vibration during low-speed rotation of the motor. The circuit includes capacitors which are charged when two transistors are kept turned on and carries out discharge through a base of one of the transistor switches when control signals are ready to turn off the transistor switches. Additional two transistors switches are connected in series to the capacitors and adapted to be kept turned on during a low-speed period and turned off during the remaining period.
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