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[PCB Prototype] Arduino project---some questions about relay

I am learning relay recently and made this project.The line and the parameters were correct. But after the power it will turned on and off at an extremely fast rate, completely out of control, what is...
  • answered May 02,2018
    by Tomas
2answers

[PCB Prototype] There is a mistake like the picture shows, anyone can tell me how to fix it?

How to fix the mistake?
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