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这里介绍的静电验电器，能够声光显示，使整个教室的学生都观察得到，还能直观地判断电荷的正、负，一目了然。电路原理如附图。我们知道，音乐集成电路输入阻抗极高，平时BGI，BGZ基极因是空翻截止，音乐集成块KD－9300的2脚无正触发电压而不工作，Y无音乐声，D也不发光，而当
The electro-static electroscope introduced here can display sound and light so that the students in the entire classroom can observe it and intuitively judge the positive and negative charges of charges at a glance. The circuit principle is as shown in the figure. We know that the input impedance of music integrated circuits is extremely high. Usually, the BGI and BGZ bases are turned off by the air. The foot of the music integration block KD-9300 has no positive trigger voltage and does not work. Y has no music and D does not emit light. when