This outline is copied from ( https://oshwhub.com/yu_chengcheng/16mmled-shuo-ma-guan ) with some homework. .
Because of the contour relationship, the pad position is small and compact, which improves the novice welding (the contour relationship can be seen, the edge of the gong is rough. Thank you Jialichuang for allowing us to realize DIY circuit software and hardware in one stop)
The double row of pins is to enhance the firmness of the connection points.
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