3D Christmas Tree Led LED Circuit Project PCB Board for Learning
Features:
The small Christmas tree is composed of two light boards and a light board
base, forming a tree-like The LEDs of the two light panels
alternately like flowing water on the tree-shaped board, which has a very
beautiful effect. The can exercise the welding ability very well, and it is
a good choice to enjoy it and give it as a

common problem:
1. First of all, if the light does not turn on after welding, this is not the quality of the light. You can use the button 2032 to test the LED before welding. The test is 3.0-3.5V and the current is about 20ma. More than 3.5V, dry batteries, batteries, batteries, cannot be used. After we welded 50 sets of tests, the reasons for the lamp failure are the static electricity of the soldering iron which damages the LED, the soldering burns the LED, and the bending of the pin damages the LED. If it is generally smooth, if two of the lights do not light up, use our more. Just replace two or three. Beginners can buy more spares in Thank you!
2. The recommended welding is to weld the components of the bottom plate first, and then weld the resistance of the A and lamp boards-LED-triode-electrolytic capacitor. The LED on the top of the A board is assembled and then soldered.
3. The resistance value should correspond to marked on the board.
4. Pay attention to the positive and negative po les of the LED lamp, and the long pin is the positive po le. The welding for time of the LED lamp should be as short as possible to avoid burning the LED.
5. Insert the triode according to the on the board.
6. Pay attention to the positive and negative po les of the electrolytic capacitor, the long pin is the positive
7. After welding a light board, you can first the positive and negative po les under the board with a 5V power supply, test to check if the light is not on, if a light is not on, check the welding and the damage of the lamp and replace it. If lights in parallel together with the schematic diagram do not light up, check the welding short-circuit phenomenon of these 6 lights. If they are not lighted, check the welding short-circuit, virtual welding, and poor power connection of the entire circuit.
8. When assembling the light board and the bottom plate, pay attention to the positive and negative po les of the light board and the bottom plate to correspond by If it is wrong, it is difficult to disassemble.

It's kits. Need to solder by yourself.
Working
Finished Dimensions: 60mm length 60mm width 136mm height
Christmas tree consists of a combination of three the user through their own welding assembly, so that the 36 LED alternating flashing, in the space of a Christmas tree in the outline of the three-dimensional
Item:Christmas Trees
Color:green

Package Content:
1x Christmas Trees