目前各类道口采用的电铃及一般晶体管音响装置，存在着音量不易调整，噪音干扰大等问题。
The prior various crossing adopt electric bells or ordinary transistor audible devices, and have the problems of difficult volume adjustment, large noise disturbance, etc.
为此，提出了功率步进电动机的新的驱动方法——脉冲调整法，并提供了晶体管电路和初步实验结果。
A new control method, the pulse-regulation method, is proposed and a transistor circuit is designed. Some preliminary experimental results are thereby given.
为此，提出了功率步进电动机的新的驱动方法——脉冲调整法，并提供了晶体管电路和初步实验结果。
A new control method, the pulse-regulation method, is proposed and a transistor circuit is designed. Some preliminary experimental results are thereby given.
应用推荐