Instructables
Do you have some spare LED's lying around? Do you have some spare time and are you looking for something to do? Why not make an LED TREE. Its fun as long as you follow the steps and use a clean Soldering iron. The result is an amazing piece of art that you can look at for hours.
 
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Step 1: Materials

You Need:
1) Soldering Equipment
2) I think it was 13 LED's (you choose how many you want. they should also be brand new so that they have long leads)
3) if you use 13 LED's you also need a 3.9 ohm resistor
4) AA battery case
5) thick wire (strong enough to hold up your bunch of LED's. Must be a conductor)
6) If you want Hot Glue to hold the wires in place
7) Blu tack to assist with soldering

Step 2: Fidgety job of soldering LED's together

Since you want the all LED's in parallel you have to solder all the cathodes and anodes together. first solder a cross of four LED's together then add two on each side to. the rest of the LED's have to be soldered on at an angle. Since new LED's have different length cathode and anode the LED's can easily be attached at an angle. During this process use a 9V battery (with a resistor of course) after every LED added to test wether you got the polarity right. otherwise if you finish and it doesn't work it will be alot harder to fix the mistake. Also keep checking your soldering for bridges. I advise you to clean your soldering iron thoroughly before you start or this process will cause you alot of pain. It took me alot longer to get it done than i thought. At least this will improve your soldering.
vishalapr3 years ago
Very neatly wrapped up 5* really nice, will subscribe to you, maybe you would like to have a look at my ibles as well
Thanks in advance
derbert5 years ago
awesome. tried it, and it's surprisingly satisfying to look at in the dark. but soldering them took ages...
eliaugust545 years ago
i have a 2.2k ohm resistor and i just wanted to know if that was okay to sub 3.9 for a 2.2k ohm.
...or a 9volt battery clip instead of a AA battery case
Awesome! I think I'll try it! I like this because it's not too expensive, but still cool. Maybe you convert it with the 'Programmable LED'- http://www.instructables.com/id/Programmable-LED/.
woodswalker5 years ago
Cool looking project! I think you need to add a few more steps. "you have to solder all the cathodes and anodes together", but I think you should show a few pics of how this is supposed to look. Also are you using any sort of core to attach the LED's to, or are they just kind of hanging onto each other?
imarzouka6 years ago
Here is a good LED calculator that I use to find the resistor values i need for my LEDs

http://ledcalculator.net
Maybe you should creat a trunk of five leds attached together or six and branch outward from the top of that with the others meeting in the middle, If you need a resistor you could shape your circuit to put it in the middle.
Bobbish8 years ago
Interesting, good use of LED's, how long does it last per battery?
puffin_juice (author)  Bobbish8 years ago
dont know, you'll have to calculate that, measure the current flow in the circuit and divide the batteries "Ahr or mAhr(first divide by 1000)" by that number and that is the answer to your question in hours. hope that helps
Crash21088 years ago
http://www.emanator.demon.co.uk/bigclive/bonsai.htm

I was thinking more of that..
I would love to see an instructable of that.
puffin_juice (author)  Crash21088 years ago
That was where I got my idea from but I cant afford that many LEDs plus I wreckon its a little over the top
bignothing8 years ago
If I used a 9v battery instead of the AA's would I still use the same value resistor?
puffin_juice (author)  bignothing8 years ago
No you have a higher voltage drop across the circuit, therefore we have to increase the resistor value so that a larger proprotion of the voltage drop is across the resistor and the LED's still have the same voltage across them. This can be calculated by working out the required current and using ohms law V=IR to calculate R
puffin_juice (author) 8 years ago
Yeah that might be cool. you should post it as a project once you've finished so i can have a look at it.
andy8 years ago
cool idea, why not combine it with the blue bawls bottle auto light circut? http://www.instructables.com/ex/i/745AE9A61B6610299AD7001143E7E506/
so you have a funky night light thing, i might give it a go myself...