Attention:

Dear friend, Christmas is coming soon. When purchasing, please distinguish between shell versions and shell free versions.

Features:
1.The product is made of high-quality materials with guaranteed quality
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 effect, it is a very good choice for giving away or viewing
4.The product is shipped as loose parts and needs to be assembled by the customer themselves. The shipment comes with a USB power cable
5.Adopting a lightweight design, the product has a wide range of application scenarios and can be used anytime, anywhere, making it very convenient

Parameters:
Name: Colorful Electronic Production Kit
Working voltage: DC5V (mobile phone charger, dry battery, etc. can be selected)
Specification: Loose parts with and without casing (self assembly required)
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.

Package include:
DIY loose parts X1

Model 3

Features:
1.The product is made of high quality PCB and electronic components materials, stable performance, quality assurance
2.Green printed circuit boards combined into the shape of a Christmas tree, easy to make, perfect for DIY enthusiasts, can improve their hands-on ability, can also be used as a decorative gift
3.The product is shipped in bulk, you need to weld it yourself, the effect is cool after welding, whether it is a gift or ornamental, it is a very good choice!
4. The product is packed in an independent static bag for protection, and shipped with a MINI USB power cord.
5.The product consists of 36 LED lights alternately flashing, the effect is beautiful, the night environment to watch the best effect Oh!

Product Description:
This Christmas tree kit consists of three circuit boards and components combined to form a tree-like shape, so that the 36 LEDs alternately flashing, presenting a three-dimensional outline of the Christmas tree in space, the effect is beautiful, used for viewing and as a gift to give are a good choice.

Parameter:
Name: Christmas tree DIY electronic kit
PCB colour: green
Working voltage: DC4.5-5V
Power supply: 3 x 5 battery pack or USB charger, computer, rechargeable treasure
Data cable interface: MINI USB

Special Note: LED by three different colours of monochrome lights, welding position should be distinguished, the long leg is positive!

Package include:
DIY loose parts X1