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DIY LED Christmas tree
The flashing Christmas tree circuit is mainly composed of a multi-vibrator circuit formed by three triodes. The D19 is a colorful LED, which can emit seven colors of light after being energized. This production has a high success rate and strong interest, and is suitable for electronic enthusiasts to install and learn.
This kit has 3 circuit boards. When installing, pay attention to the LED LED and the direction of the triode insertion. The color of the LED can be combined by itself. After the insertion, the pin is left about 6 mm and bent parallel to the circuit board. Welding time, do not cause LED damage due to long welding time. Pay attention to the final soldering of D19 on the JC162 board. After soldering the components, JC161 and JC162 are correctly inserted in the cross, and then inserted into the bottom board. When inserting, pay attention to the polarity of the power supply marked on the two boards JC161 and JC162. After soldering and fixing.
After the installation is completed, the power can be tested without any errors. There are two options for the power supply of this circuit. It can be powered by three 5th batteries. If the battery is not used, you can also connect the mobile phone charger through the USB dedicated cable (optional). 5V) powers the circuit.