Step 7: Finishing up

We've now got all the parts we need. All we need to do now is put the bottom part into the cube to make it a whole cube.

1. Use the glue gun again to put the connector for the adapter right behind the hole. Tip: Plug the cable in before gluing. This way the connector will always be on the right spot.

2. Sand the sides of the bottom plate so it fits snugly into the bottom. You just want the bottom plate slightly bigger then the hole it fits in. This way, once you put it in there, it will get stuck and won't let go while moving the cube. We won't glue the bottom, in case we need to open it for some reason. So make sure the bottom fits in tight.

That's it!!
Now plug everything in and put your music on max and enjoy!

You can change this project as much as you like. Use any LED's you want, create the box that fits the best on your desk, etc. You can also build the cube from my previous instructable.

I used photoshop to show you how different colors would look like (photo 7).

I tried to make this instructable the way so everyone can understand it. I'll try to answer them all. If you want to make one and get stuck, we'll try to get through it together.
If you have any questions please don't be shy and let me know.

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mmehzin1 year ago

how do i hear the music if we put audio jack in laptop?

samzimmer mmehzin11 months ago

Just buy an audio y-cable (splitter) then one output can go to the lights, and one to speakers/headphones

samzimmer11 months ago

Very cool!

Works out of a portable cd player, but not out of my laptop or phone... any reason why???

slamsam911 year ago
is there a way or setting where the lights have the option of simply turning on/off without strobing/reacting to music when you want? and then switching it back to being musically sensitive?
when you plug it in, can you hear the music play?
tgrant62 years ago
deepu132 years ago
how the music out put at the system is given in the cube??
dada113 years ago
if you're using an 12v audio amplifier, you could just connect the LEDs directly to the output terminal(for speakers), no need for transistor and power source but a loud volume for the LED to lit up.
sheadacus3 years ago
Love this project! Finished mine about a month ago. Used 100 LEDs and modified the circuit slightly. Made two frosted plexiglass towers and a long box under my dresser. Also put a switch for on/off/music on it. Enjoy.
G3orge263 years ago
Hello .... well i have to say that this is epic ... however led are quite ennoying in terms of positioning so i made this using led tape :DD and i have an important question to ask..... are you ready ?? :| is there any way to make this so that the really bass notes play ,say, in red color and the more light notes play in white color .. ?? ( sorry if this is hard to understand but i can't explain it better ...)
what im trying to say is that the colors of this box range between white and some other color .... :P
If you want that I recommend this video: http://www.youtube.com/watch?v=ubQC839Pvqk :3 hope that helps
It would require and amplifier/filter. easiest way is to just hook these up to a surround sound with the input signals for one string of leds coming from the subwoofer and 1 string of leds for the speakers.
HI, could you tell me if this is possible, how can you make this so you can have a switch were you can select music mode soild color or not on at all and be able to select wich one you wanted, is this possible? thanks!
Use the wiring diagram in this instructable to have it switch between constant on and flash with music. I dont think you can have not at all, maybe a 3 position switch?
FTWhitledge3 years ago
If I were to use a molex from the power supply of my PC at 12v, I could do this with that correct? I would just have to watch the amperage if I were to string a bunch in parallel right?
arjoun3 years ago
when I plug the jack is working properly mias led the pa probe as I do for the LED and sounds foction ensenmble?? I want to answer plzzzzzz
kiler014 years ago
i jsut finished mine, but i have a bit of a problem: it only works on pc and when the wound is turned on to max. if i try it on something liek a psp it wont light up. how to increase sensitivity?
Implement audio amp IC. LM386N can work up to 12 volts.
nope wont work i used the same logic. the lm 386 requires a negative voltage so instead of ground you need 2 voltage source. one is a positive 12 volts. one is negative 12 volts. and also 90% of the time transformers are more than12 volts so that chip will fry...i have the burn mark on my finger to prove it lol
if you use fewer LEDs, then you will get a brighter light. for example, i have mine running off of a 9v battery, so i only use 4 LEDs set up in series. you could make it a series-parallel circuit too, if you want. that will let you get the same amount of light for less power.
dtompkins224 years ago
noob question but, how can you hear the music if the audio jack goes straight into, for example, an ipod?
Basically what Luong said.

BUT! If you really want to get creative what I did was I took a female audio jack port and I just attached the wires to where the other jack port was and there you go! Just attach your speakers to it and it should play just the same as a splitter and looks cleaner too in my opinion.

duggerpato4 years ago
Nice! It was a bit squirrely at first, but they work. Funny thing, I unplugged the power supply and the speaker source kept on flashing them anyways. Guess I didn't need the power supply after all. Must be because my LEDs are much lower intensity than this instructable.
ayushgarg4 years ago
hey i m doing the same way but just using 2 9v batteries...

I m bit confused abt how to connect the 3.5mm jack... when i open that wire i hv 2 bluish wires nd 1 red-brown wire... which one is what ...??
ayushgarg4 years ago
hey i m doing the same way but just using 2 9v batteries...

I m bit confused abt how to connect the 3.5mm jack... when i open that wire i hv 2 bluish wires nd 1 red-brown wire... which one is what ...??
Dude how to make two light boxes with a different flash!
tezza3215 years ago
Wouldnt it be also possible to put audio output on the box with the following method:- Items needed - 3.5mm male to female audio cable, take your 3.5mm male to female take the male end off and wire it to the same areas as the guide states above and the loose wire you didnt use (if you used the left wire it would be the right one and opposite) and wire it direct to the new audio output. edited the diagram to show this dunno if it works just an idea.
I am in the process of thinking of the same thing now, I think i have it figured out. I woundn't know till I try it though.
i have a question, do i need to use AC or DC current?
Definitely DC Current.
TR54 years ago
So the transistor is responsible for regulating the minimum voltage required to make the lights go off? Something must regulate that, otherwise it the LEDs would be on constantly for any given song. So how can you change the sensitivity of this "switch"? A different transistor?

I ask because I would like to add another strip that would flash at a different voltage, so that it would only go off when the music got even louder/ more intense.
so, I've got a light ring (25 LED's) and it's powered off of 4 AA's (4.6v.) i tried doing this by wiring it into the ring but it didn't work, will i have to do 3v. per LED (75v.)?
Yes but you can use this tool to help you use less voltage: http://led.linear1.org/led.wiz

Too much voltage is dangerous at those amp levels.
GreenD5 years ago
Could you just wire this in parrallel to your speakers? i.e. the audio plug from your audio device (comp/mp3) is directed in parallel to both your speaker system & this box system?
A 3.5mm splitter would do exactly that without any need for stripping or DIYness, but if you want to you can.
How could you make each light react to different frequencies in the music? Say you have a full set of nine lights, 3 were red, 3 were yellow and the 3 were green. The reds would react to low freqs and the yellow would react to mids, etc. I figured this would require 3 setup, each with its own transistor but if I had a good power source, like a computer PSU I wouldn't need to find a crazy AC>DC adapter. When it comes to selecting frequencies I'm stuck, would I use capacitors or resistors? Or neither?! :|
infanati5 years ago
alright i got a stupid question. if i were to plug that into my laptop i would have a problem since the only entries for that cable are the headphones and mic. so how and where could i plug that?
One way to do this is to have a set of external speakers. I have a head phone jack splitter then I have my speakers into one side and the lights into the other. It's working great for me! I'm not even using the same transistor. I'm using a LM7805 and it still works(as long as your over the input voltage requirement [5v in this case] you golden!).
Jujumagumbo5 years ago
Ok so i did everything, checked the wires and everything is connected to the right places, but when i plug it into my music source, whether it be my laptop or ipod, the lights turn on but dont flash to the beat. I am using four 2.8V LEDs and a 12V AC adapter, please help! thanks.
infanati5 years ago
another, would it be possible to replace the Tip31 transitor with a LM341?
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