Heart rate monitoring circuit
Source: InternetPublisher:张七岁 Updated: 2014/03/20
![心率监测电路](http://www.eeworld.com.cn/circuit/upload/538a1bc8a409ff500dc8e0cb6c6d7ecb/b6e8f376-3c63-11ec-9c61-086126841eb8.gif)
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