| 摘要 |
PURPOSE:To reduce voice frequency noise by controlling the ON and OFF speed of a current absorbed through windings, and feeding back a counterelectromotive force generating at deenergized winding. CONSTITUTION:Transistors Q5, Q6 are operated as Darlington pair 12 to supply power to motor winding W1, and transistors Q7, Q8 are operated as Darlington pair 14 to supply power to motor winding W2. Capacitors C1-C4 and resistors R5, R6 are used to control the rate of the power applied to the windings W1, W2, and the counterelectromotive force generated by the deenergized motor winding is fed back to alleviate the voice frequency noise. |
