我们都知道，一个低频的开关信号作用于普通的绕线电感（wire winding coil），会使得电感中的线上海led电子大屏幕圈之间互相产生机械振动，该机械振动的频率正好落在上述频率，电感发出的噪音就能够被人耳闻...
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Coil resistance is determined by the cross-sectional area and length of the wire used in winding the coil.
线圈电阻是由线圈导线的横截面积和长度决定的。
Usage: suitable for family use dynamotor rotor coil two poles wire winding in the same time.
用途：适用家用发电机转子线圈两极同时排绕线。
Usage: suitable for automatic wire winding of kinds of small type of transformer coil, switch coil and ballast coil.
用途：适用于各种小型变压器线圈，开关线圈、镇流器线圈的自动排绕线。
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