3D LED Christmas Tree

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DIY solder kit. The flashing Christmas tree kit consists of three circuit boards, 37 LEDs that alternate flashing, and dual power sources.


Michael Behrens wrote 01/01/2024 at 16:03 point

Merry Christmas!  Got it working with help from this post!  I forgot to have the LEDs pointing out though! I got mine in 2019 and finished it yesterday (still within the Octave of Christmas), albeit two years late.

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brushycreek1953 wrote 12/03/2022 at 17:08 point

Thank you for this set of instructions. I received no information with my kit from Ali and this saved me having to figure it all out on my own. I received the 10K resistors, but the other values were 150 ohms and R7 is 470 ohms. I also received 47uf caps. It's very bright, but nothing seems to be getting hot. I run it with 3 NiMh batteries and it's dimmer then it is with a USB adaptor. 

Couple of suggestions. Prebend your LED's. I bent mine over a 1/8" thick wooden ruler clamped in a bench vice. Be sure you bend them in the correct direction, so they can be assembled as described above (long leg in square pad). I inserted the LED's and splayed the leads. Making sure none of the leads touched each other, I  tested that section of the tree BEFORE soldering all of the LED's 

Definitely assemble the base, with the battery holder, before you add the tree or you'll be cussing those little nuts. 

I slid the 2 tree halves together and them placed them on the base before soldering them together. I tacked them to the base and then soldered the halves together. This ensured that the tree halves were perpendicular to each other. 

Lastly, if you happen to not read the section describing the switch and put it on backwards, it still works, but the on/off positions are different than the diagram on the PCB, IE out is on and in is off.  Have fun! 

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norbert wrote 11/25/2017 at 16:58 point

@Mathijs Groothuis: The other board is being populated jut the same as the first one. The resistors are not exactly at the same place but are numbered the same. R7 is only on the first board. The LEDs are also in the same order.
BTW: I came across pictures on Aliexpress that were mirrored left to right.

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Mathijs Groothuis wrote 01/03/2017 at 20:43 point

I see many trees with a whole different led order for the other tree half. On this page I only see the first half. All other trees on the internet have different order. Can you elaborate on this one? My green was too dim, so I changed it to your order, but I don't really understand what's the correct order when you take in account that certain resistors are meant for a certain color.

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cleech21 wrote 12/21/2016 at 21:46 point

Thank you for taking the time to post this. The little trees are a nice Xmas project and they do not come with instructions these days. There are dozens of vendors happy to take your money mind you.:-) I got a very Chinese version of the  BOM  but this is so much better. Bless you  mate :-) I chnaged the current limiting resisitor all to 330 and the green are all still too dim for my tastes. I did not place the led's per instructions either :P

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