电子节拍器可以帮助我们练习唱歌和印放相片时控制时间等等。节拍器电路如图1所示。当开关K闭合时,处于正反馈的晶体管开始振荡,振荡电流在线圈中产生交变磁场,通过铁心向外辐射电磁波。利用收音机接收节拍器辐射的电磁波,可以将收音机调到没有电台的位置, Electronic metronome can help us practice singing and printing photos control time and so on. Metronome circuit shown in Figure 1. When the switch K is closed, the transistor in the positive feedback starts to oscillate, the oscillating current generates an alternating magnetic field in the coil, and the electromagnetic wave radiates outward through the core. The use of radios to receive metronome electromagnetic radiation, the radio can be transferred to the location without a radio,