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Making bright and shiny Christmas trees with LEDs 
Schematic: 
According to the circuit diagram, 16 LEDs are divided into four groups according to the above method. Each group of internal small lamps is connected in series, and the groups are connected in parallel with each other and in parallel with the power supply. 
The third layer is green LED 04~08, of which 04~07 is a group. Note that there is one LED and the other four are separate 
The second layer, note that although the three LEDs are arranged in a triangle, they are not actually connected to each other. 
The red LED is soldered to the second layer, and the third layer of 08 is soldered to the fourth layer of 09-11. 
Now I have got 4 sets of LEDs in series. 
The four sets of series LEDs just obtained can be connected in parallel. The fourth layer is completed. 
The third and fourth layers are completed 
Completed overall. Note that after adding the first layer and the second layer, you also need to make a "tree root" for the Christmas tree to make it stand on the battery steadily (there is a positive pole and a negative pole, and then it is stable with one foot.) )). To protect the LED light, a 100 ohm resistor can be added between the positive pole of the Christmas tree and the positive pole of the battery.
Making shiny and bright Christmas trees with LED lights
Handmade materials:
â— Electric iron
â— Diagonal pliers
â— Dice (optional, recommended)
â— Multimeter (optional)
â—‹ 1 red LED
â—‹ 15 green LEDs (3 piles, 5 piles, 7 piles)
â—‹ Solder wire
â—‹ 9V battery (the square type, it is still very easy to find)
○ 100Ω resistor (optional)
The four LEDs connected in series are a group, and the four groups are simultaneously connected in parallel to the two poles of the battery. The resistor on the left side of the battery acts as a protective LED.
The measured LED small lamp in a picture needs a minimum voltage of 1.6V, and it can normally emit light when it is subjected to 2.1V voltage. The new 9V carbon battery has an output voltage of 10V. Theoretically, each small lamp is subjected to 2.5V. But in fact, after the four groups of LEDs are connected in parallel on the battery, the operating voltage of the new battery drops to 8.6V, so it is about 2.1V evenly distributed to each LED.
The green LED pins are bent into three different shapes, from left to right: fourth layer (7), third layer (5), second layer (3), and first layer (1) One, should be a red LED), and then use a soldering iron to solder the LEDs in series in groups of four.
Note that the LED has positive and negative poles, don't reverse it.
The fourth layer is green LED 09~15, of which 12~15 is a group, and 09~11 and the third layer 08 are combined into one group. Note that the middle is separate, the four on the left are connected together, and the three on the right are connected together.