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贵刊1988年第1期“实验拾零”专栏《用发光二极管演示电磁振荡》这一方法解决了我校多年来未真正做成的一个实验难题。但我们在仿制该演示器中发现该仪器还有一个缺点,那就是用电解电容器来充当LC电路中的电容器C是很不易成功的。因为电解电容器容易老化,而且常有漏电现象,导致实验不易成功。现我们改用了日光灯上提高功率因数用的电容器,这种电容器不会漏电,所以可靠性极高。我们是用10只3.75μF的电容器并联起来当1只电容器使用(目的是增
The first issue of “The Experiment Zero-picking” column entitled “Demonstrating Electromagnetic Oscillations with Light Emitting Diodes” in No. 1 of 1988 was a solution to the experimental problem that our school had not really created over the years. However, we found that the instrument in the imitation of the demonstrator has another drawback. It is very difficult to use an electrolytic capacitor to act as a capacitor C in an LC circuit. Because electrolytic capacitors are prone to aging, and leakage is common, the experiment is not easy to succeed. Now we have switched to a capacitor for increasing the power factor on a fluorescent lamp. This type of capacitor does not leak electricity, so its reliability is extremely high. We use 10 3.75μF capacitors in parallel to use one capacitor (purpose is to increase