【摘要】 利用光敏电阻设计了光开关设计性实验,学生先测量光敏电阻的伏安特性和光照特性,然后自行设计光控开关,模拟路灯的自动控制,实现"天黑自动开启,天亮自动关闭"的功能.利用NE555P双稳定电路和LM741运算放大器分别设计电路,解释了光开关的工作原理.更多还原

【Abstract】 A designing experiment of optical switch with photoresistors was introduced.In the experiment,students measured the physical characteristics of photoresistors first,then they designed at least one circuit that could realize the function of"automatic on in the dark and automatic off during the day"to simulate the automatic control of street lamp.This experiment had been applied in our course for many years,and its teaching effect was incredibly good.Making use of NE555 Pbistable circuit and LM741 operational amplifier,the circuits were designed respectively,and the working principle of optical switch was explained.更多还原