学校上课下课的铃声陪伴我们几多春秋,给我们带来几多欢乐!电铃是怎样发出声音的呢?我们一起来做个电铃,来探究电铃的奥秘吧!一、器材两个节能灯电路板拆下的电感线圈,两个铃铛,5号电池三节,长螺丝三个,圆珠笔弹簧一个,废旧钢卷尺一段(或其他有弹性的金属片),三合板一块(或其他硬质纸板),导线若干。二、制作过程1.在三合板上用铅笔先画出电铃的工作电路图,如图1所示。图12.按图2制作四个直角支架 How many bells and whistles will be brought by the ringtones of get out of class in school and how much joy we bring to us! How do the bells make a sound? Let’s work together as an electric bells to explore the mystery of electric bells. Remove the inductor coil, two bells, No. 5 batteries three, three long screws, a ballpoint pens, a section of scrap steel tape (or other flexible sheet metal), a plywood (or other hardboard), a number of wires . Second, the production process 1. On the plywood with a pencil draw the bell work circuit, as shown in Figure 1. Figure 12. Make four right-angle brackets according to Figure 2