笨手求助

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网上购买一3525前级驱动板,不知变压器初级应该多少圈请师傅们帮忙!
淘宝说: 商品体积7.5*4*3CM    频率20KH如果需要改变频率可根据需要定做 适合各种高频低频变压器的前级驱动 能满足不同功率逆变器驱动