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Note: it is not including battery and it is not welding
Christmas tree flash kit is composed of l6 LED (light-emitting diode), and 16 LED is divided into four groups, each group has a different flash frequency, when the combination of four LED lights flash together, like A lighted Christmas tree, powered by 9v battery. This circuit production advantages: simple and practical, small power consumption, fewer circuit parts, the circuit is simple and easy to understand, the package with a plug-in external connection with plug-in, easy to replace parts at any time and is conducive to circuit debugging, but also allow students to debug Deepen the understanding of the circuit principle in the process.