ELECTRONIC 3D CHRISTMAS TREE KIT, MULTICOLOR LED

All pictures are for illustrative purposes only.

PID# 16545

15,00 CA$/KIT
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Description

The circuit principle is as follows:

Working principle:

As can be seen from the schematic diagram, when connected to a 3-5V power supply, 18 LEDs are divided into 3 groups. Whenever the power is turned on, the 3 transistors will compete to be turned on first, but due to differences in components, only one transistor is turned on first. Here, it is assumed that Q1 is turned on first, then the LED1 group lights up. As Q1 is turned on, its collector voltage drops, causing the left end of capacitor C2 to drop, close to 0V. Since the voltage across the capacitor cannot change suddenly, the base of Q2 is also connected to approximately 0V, Q2 is cut off, so the LED2 group connected to its collector is extinguished; at this time, the high voltage of Q2 increases the collector voltage of Q3 through capacitor C3, and Q3 will also turn on quickly, and the LED3 group lights up. Therefore, for a period of time, the collectors of Q1 and Q3 are both low, and the two groups of LED1 and LED3 are lit, and the LED2 group is extinguished. However, as the power supply charges C2 through resistor R2, the base voltage of Q2 gradually increases. When it exceeds At 0.7V, Q2 changes from the cut-off state to the on state, the collector voltage drops, and the LED2 group lights up. At the same time, the voltage dropped by the collector of Q2 also reduces the base voltage of Q3 through C3, Q3 changes from on to cut-off, its collector voltage increases, and the LED3 group goes out. Next, the circuit cycles according to the process described above, and the three groups of 18 LEDs will light up in turn. Two groups are lit at the same time. These LEDs are arranged crosswise into a heart-shaped pattern, flashing and emitting light in a continuous cycle to achieve a flowing display effect.

1. Welding of boards A and B of the Christmas tree (the welding method of the two boards is the same, compared with the two boards, board B has less R7 )

1. Weld the 100R resistor ( there is no direction, it is marked on the resistor when it is shipped, don’t weld it wrong )

2. Weld the 4.7K resistor ( there is no direction, it is marked on the resistor when it is shipped, don’t weld it wrong )

3. Welding 9014 ( direction, soldering against the direction of the circuit board silk screen )

4. Weld 47uf electrolytic capacitor ( with direction, the long leg is positive )

5. Welding the LED , The LED are all the same and can be welded anywhere ( there is a direction, the long leg is positive, and the soldering iron cannot weld both LED pins at the same time )

6. Solder the top led , and use red for the three-color lamp version ( note: you need to combine boards A and B before welding )

 

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