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28 LED Clock Timer(74HCT4020)

2014-12-07 01:22  
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This article describes the 28 LED Clock Timer (74HCT4020). The content is very simple, very practical. The components of the article can help you understand better grasp this principle. For example, in this part of the principle, you can go to find and buy the components: 74HCT4020. 

clock 28 LED Clock Timer