diymore | LED Multicolored Christmas Tree DIY Kit LED Flashing Light Circuit Kit Fun Electronics Soldering Practice Set

Product Features:1. Made from high-quality materials, ensuring superior quality2. This kit is ideal for training in welding skills and is also perfect for DIY enthusiasts, helping them significantly improve their hands-on abilities3. Features a flashing effect created by multicolored LED lights, making it an excellent choice for both gift-giving and display4. The product is shipped as unassembled parts; customers must assemble it themselves. A USB power cable is included with the shipment.5. Featuring a lightweight design, the product is versatile and can be used anytime, anywhere—making it extremely convenient.Product Specifications:Name: Multicolored Christmas Tree Electronics KitOperating Voltage: DC 5V (can be powered by a cell phone charger, dry cell batteries, etc.)Specifications: Unassembled parts with housing and unassembled parts without housing (requires self-assembly)Operating Principle: When connected to a 3–5V power source, the 37 LEDs are divided into 4 groups. Whenever power is applied, all 4 transistors attempt to turn on simultaneously; however, due to variations in the components, only one transistor turns on first. Assuming Q1 turns on first, the group containing LED1 lights up. As Q1 turns on, the voltage at its collector drops, causing the voltage at the left end of capacitor C2 to drop to near 0V. Since the voltage across a capacitor cannot change abruptly, the base of Q2 is also brought to approximately 0V, causing Q2 to turn off; thus, the group containing LED2 connected to its collector goes out; At this point, the high voltage across Q2 raises the voltage at the collector of Q3 via capacitor C3, causing Q3 to turn on rapidly, and the LED3 group lights up. Consequently, for a brief period, the collectors of both Q1 and Q3 are at a low voltage level, and the LED1 and LED3 groups are both lit. the LED2 group is off. However, as the power supply charges capacitor C2 through resistor R2, the base voltage of Q2 gradually rises. When it exceeds 0.7 V, Q2 transitions from the off state to the on state, causing its collector voltage to drop; the LED2 group lights up. At the same time, the drop in collector voltage of Q2, transmitted through C3, causes the base voltage of Q3 to decrease as well; Q3 transitions from the on state to the off state, and its collector voltage rises, causing the LED3 group to turn off. The circuit then cycles through the process described above, causing the three groups of 18 LEDs to light up in turn. At any given moment, two groups are illuminated. These LEDs are arranged in a crisscross pattern to form a heart shape, continuously cycling through flashes of light to create a flowing display effect.Packing List:Christmas Tree DIY Kit x1