RGB LED Flashing Christmas Tree DIY Kit Electronics Soldering Colorful 3D Xmas Tree DIY Kit for Soldering Practice_qt5

Working principle: When connected to a 3-5 V power supply, 37 LEDs are divided into four groups. Whenever the power is turned on, the four transistors will compete to conduct first. However, due to differences in components, only one transistor will conduct first. Here, if Q1 conducts first, the LED1 group will light up. Due to Q1's conduction, the collector voltage drops, causing the left end of capacitor C2 to decrease, approaching 0V. Since the voltage at both ends of the capacitor cannot suddenly change, the base of Q2 is also connected to approximately 0V, Q2 cut-off, therefore the LED2 group connected to its collector is extinguished; At this point, the high voltage of Q2 increases the collector voltage of Q3 through the capacitor C3, and Q3 will also quickly conduct. The LED3 group will light up. Therefore, for a period of time, the collectors of Q1 and Q3 will be at a low level. The LED1 and LED3 groups will light up, and the LED2 group will go out. However, as the power supply charges C2 through the resistor R2, the base voltage of Q2 will gradually increase. When it exceeds 0.7V, Q2 will change from a cut-off state to a conduction state, and the collector voltage will decrease. The LED2 group will light up, At the same time, the voltage of Q2's collector decreases through C3, and the base voltage of Q3 also decreases. Q3 changes from conduction to cutoff, and its collector voltage increases. The LED 3 group goes out. Next, the circuit cycles according to the process described above, and three sets of 18 LEDs will light up in turn. At the same time, two sets of LEDs will be lit up, and these LEDs are arranged in a heart shaped pattern, continuously flashing and emitting light, achieving the effect of flowing display. 1. The product is made of materials 2. This kit is very suitable for training welding skills and is also very suitable for DIY enthusiasts, which can greatly improve their hands-on abilities 3. Composed of colorful LED lights with a flashing e