555 infrared sound and light alarm circuit
Source: InternetPublisher:天天都吃好吃的 Updated: 2019/10/02
![555红外线声光报警器电路](http://www.eeworld.com.cn/circuit/upload/538a1bc8a409ff500dc8e0cb6c6d7ecb/8c704a12-3c63-11ec-bcdb-086126841eb8.gif)
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