1. The glitter Christmas tree kit is composed of three circuit boards, all of which adopt double-sided circuit design. 2. Users can weld by themselves to make 36 LEDs flash alternately to present a three-dimensional outline of the Christmas tree in the space (the best viewing effect is in a night environment).
3. Install according to the component numbers on the list for easy installation.
4. There are two options for the power supply of this circuit. It can be powered by 3 AA batteries. If you do not use batteries, you can also connect a mobile phone charger (5V) through USB to power the circuit.
5. This kit is very suitable for training welding and hands-on skills. It is very suitable for students' practical training and children's enlightenment training. After the production is completed, it is a good choice whether it is used for your own entertainment or as a holiday gift.
Kit name: Glitter Christmas tree
Working voltage: DC4.5-5V
Size: 60 long*60 wide*136mm
Power supply method: 3 AA batteries or USB charger (Shipped without battery)
Overall dimensions: 60mm long*60mm wide*136mm high
The CTR-30 flashing Christmas tree kit is composed of three circuit boards. Users can weld and assemble it by themselves, allowing 36 LEDs to flash alternately, presenting a three-dimensional outline of the Christmas tree in the space (the viewing effect is better in a night environment).
1. Welding CTR-30A circuit board (referred to as A board)
1. Solder 4 resistors (R1 R3 R5 R7)
2. Solder 3 resistors (R2 R4 R6)
3. Weld 3 transistors and install them horizontally (with direction)
4. Weld 3 electrolytic capacitors and install them horizontally (with direction)
5. Solder the red LED (with direction), the red LED numbers are D1~D6.
6. After folding the pins, insert them into the corresponding holes (pay attention to the installation direction)
7. The red LED is welded (numbered D1~D6). 8. The yellow LED (numbered with direction) is soldered, numbered D7~D129. The green LED (numbered with direction) is soldered, numbered D13~D18. At this point, the welding of board A is completed.
2. Next, use the same direction to solder the CTR-30B circuit board, referred to as B board.
There are two components in board A and board B that have different installation positions (just install according to the positions on the component list): 1. The installation positions of R2 R4 R6 resistors are different; 2. The installation positions of red, green and yellow LEDs are different.
10. After the A board and B board are welded, you can turn on the power to test whether the two boards can emit light and flash normally. After both boards A and B can flash normally, continue with the next steps.
11. Solder CTR-30C circuit board, referred to as C board, and solder 1 DC socket (with direction)
12. Weld 1 key switch (with direction)
13. Combine A board and B board (there are directions, the positioning arrows of the two boards are as shown below). After the two positioning arrows are aligned, use a soldering iron to fix the two boards together.
14. Combination of battery box and C plate Battery box and C plate combination A. Weld the battery box wires B. Fix the battery box with screws and nuts.
15. Combine the AB board and C board that have been assembled in advance (the directions, positioning arrows and power supply polarity must be consistent).
16. Solder the top LED (with direction)
Please install according to the labels of the components on the above list. Note that the colors of the LEDs should also be installed according to the numbers. After installing the A board, first energize the positive and negative poles under the A board to see if they are installed correctly and can work normally (flashes alternately). Similarly, board B is installed in the same way as board A. After the installation and testing are correct, they are then cross-installed together. Finally, the AB crossed combined boards are installed on board C. After powering on, it can work normally. The Christmas tree is basically at night It is used, so this product can show better effects at night.
1 Christmas tree kit (Shipped without battery)
Type 2: 16LED Flashing Diodes Glitter Christmas Tree DIY Circuit Kit
1. The product is compact and easy to carry.
2. Simple to use and easy to operate.
3. Long service life and reliable quality.
4. Excellent quality, exquisite workmanship and excellent materials.
5. Widely used and can be used in multiple scenarios.
This circuit consists of 16 LEDs (Light Emitting Diodes). The 16 LEDs are divided into four groups, each group has a different flashing frequency, and when the four groups flash together. This project looks like a small Christmas tree. This circuit is powered by a 9V battery.
The circuit is simple and practical, with low power consumption. Using integrated circuit driver: few components, the circuit is simple and easy to understand.
Board size: 70mm * 110mm
PCB circuit board
Battery box assembly (without battery)
Type 3: DC4.5-5V 7-Color Glitter Christmas Tree DIY Circuit Kit
1.100% brand new and high quality product.
2. Made of high-quality materials, durable and practical.
3. Small size, simple application and easy installation.
4. Efficient and stable performance, long working life.
5. Wide range of applications.
Working voltage: DC4.5-5V
Size: 60*136mm
36 LEDs can be soldered alternately
1*DIY kit (Delivered without batteries)
Type 4：RGB LED Flashing Christmas Tree DIY Kits Electronics Soldering Colorful 3D Xmas Tree DIY Kits for Soldering Practice Learning
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 Christmas Tree Electronic Production Kit
Working voltage: DC5V (mobile phone charger, dry battery, etc. can be selected)
Specification: Loose parts with case (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:
1 Set Christmas tree DIY loose parts (Shipped without battery)
Type 5：Rotating Colorful Music Christmas Tree Led Flowing Water Electronic Diy Kit Christmas Decoration Gift 
Features:
1.The product is made of high quality PCB material, quality is guaranteed
2.Parameters with acrylic shell and without acrylic shell optional, shipping with USB adapter cable, you can use the charger, rechargeable treasure, the computer's USB port power supply
3. Beautifully designed products, the base of the white hair blue LED to achieve the effect of breathing lights, the Christmas tree is above the colourful LED, to achieve the effect of running lights
4.Shipped as DIY loose parts, customers need to assemble by themselves
5. This is a flash rotating music Christmas tree, very suitable for DIY enthusiasts, can be used for Christmas decorations, welding practice, electronic welding training, ornaments, gifts, while you can improve their hands-on skills
Parameters of the product with shell:
Kit name: flash rotating music Christmas tree
Working voltage: DC4-5.5V
Power supply interface: DC005 (5.5 * 2.1), shipping with USB adapter cable, you can use the charger, rechargeable treasure, the computer's USB port power supply
Function: Base 18 5MM white hair blue LED to achieve the effect of breathing lights, Christmas tree above the 3MM colourful LED, to achieve the running lights, play with the passive buzzer
With shell loose parts list:
Christmas tree A board X1
Christmas tree B board X1
Rotating top PCB X1
Rotating middle PCB X1
Rotating base PCB X1
M3*25 double pass copper column X4
M3*10 double pass copper post X5
M3*10 screws X6
M3*6 screws X15
M3 Nut X4
5MM LED white blue X20
3MM LED seven colours X40
22UF 25V Electrolytic Capacitor X10
9014 Triode X7
8050 Triode X2
47KX10
100Ohm X8
100K Resistor X1
30K Resistor X1
20K Adjustable Resistor Horizontal X1
BJ1522 Music ICX1
104 Porcelain Chip Capacitor X1
8P IC Holder X1
LM358 chip X1
Passive Buzzer X1
Deceleration motor X1
DC005 Block X1
DC005 cable X1
Small spring X3
Acrylic shell 1 set X6 pieces
M3*8 screw X20
M3 nut X15
Circuit diagram and production information download address:
Link: https://pan.baidu.com/s/17y0ZXg1eqWcZViysGe3VTA
Extract code: 4fm8
Copy this content and open the Baidu.com disc mobile app, the operation is more convenient Oh!
Precautions for use:
Prohibit the use of external forces to rotate the tree, otherwise the gears inside the gearmotor will be damaged, resulting in failure to rotate.
The acrylic shell is transparent material, shipped with a layer of protective film on each of the 2 sides of the earth yellow. Installation with a razor blade to gently scrape the edge of the acrylic can be torn.
Package include:
1 Set DIY loose parts (Shipped without battery)