The circular circuit is the running water lamp circuit, which is composed of CD4017, NE555 and leds, which can be used to work after being welded. This exercise board is easy to assemble and weld, and can be widely used in personal hobbies, school electronic projects, training for mobile phones, confidential electronic equipment maintenance personnel, and electronic competitions. High quality PCBs are clearly labeled with electronic components, and the back of the PCB board is marked with millimeters/proportions for easy measurement of parts. It is a beautiful water lamp circuit ，which can be used for decoration, such as decorating Christmas trees, bookshelves, doors, Christmas decorations, desktop decorations, etc. This product is DIY kits, not th.
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