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取1只纸口杯或冰激凌纸简在底部粘1个直径略大于永久磁铁的高2～3cm 的纸筒,用直径0.19～0.29mm 漆包线绕80圈,直流电阻约2Ω。取任意形状永磁体1块(圆型、矩型都行),固定在1木块上。可粘贴,亦可在木板上钉一小块铁皮,让磁体吸在铁皮上。如能找到纽扣大小的小磁块最好,用一钢壁钉,拧在木块上,再在上面用502胶粘一纽扣磁块。如图1所示,将有线纸口杯,线圈两端引线漆打磨干净,连接1个耳机插头,将线圈套在永磁体上,最后
Take a paper cup or ice cream paper stick on the bottom of a paper tube with a diameter slightly larger than the permanent magnet of 2 ~ 3cm, with a diameter of 0.19 ~ 0.29mm enameled wire around 80 turns, DC resistance of about 2Ω. Take one piece of permanent magnet of arbitrary shape (circular and rectangular), and fix it on a wooden block. Can be pasted, you can also nail a small piece of metal on the wood, so that the magnets on the iron skin. If you can find a small magnet with a button size, it is best to use a steel stud, screw on a wooden block, and glue a button magnet with 502 on it. As shown in Figure 1, the wired paper cups and the lead paints on both ends of the coils are polished, and a headphone plug is connected, and the coil is sheathed on the permanent magnets.