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本文介绍一种简单、灵敏度高的光控电路:“报晓”公鸡,能对早晨微弱的阳光变化发生反应。线路如图1,IC1组成施密特触发电路,IC2组成鸡叫发生电路。无光照时光敏二极管RL处于高阻状态;使LC1③脚为低电平,音乐片因无电源不发声;当有光照时RL处于低阻状态,使IC1的③脚输出高电平(约3.4V)。VD1是为防止电流过大损坏IC1,VD2为3V稳压管,为音乐片提供稳定的工作电压。
This article describes a simple, high-sensitivity light control circuit: The Awareness rooster, which responds to weak morning light changes in the morning. Circuit shown in Figure 1, IC1 Schmitt trigger circuit composed of chicken IC2 composition circuit. The photodiode RL is in a high impedance state when there is no light, so that the LC1 pin is low, the music piece does not sound due to no power supply, and the RL is in a low resistance state when there is light, so that the pin of IC1 outputs high level ). VD1 is to prevent excessive current damage IC1, VD2 3V regulator, for the music piece to provide a stable working voltage.