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Photoelectric isolation circuit between TTL circuit and relay circuit
Source: InternetPublisher:天天都吃好吃的 Updated: 2010/08/11
![TTL电路和继电器电路之间的光电隔离电路](http://www.eeworld.com.cn/circuit/upload/538a1bc8a409ff500dc8e0cb6c6d7ecb/ad46d64a-3c63-11ec-ab37-086126841eb8.gif)
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