Instructables
Picture of Light organ
Here is how to build a light organ, an electronic device which automatically converts an audio signal (such as music) into rhythmic light effects
 
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Step 1: Materials

Picture of Materials
1. LED lights 
2. Transistor BD233 (or similar one) 
3. 12V adapter (or battery)
4. Cable from headphones
5. Electric wires 
6. Acrylic glass 
7. Sand paper

Step 2: Making the box

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Take the acrylic glass and draw the shapes that you will need for the box. 
I had four 15x5 cm and two 5x5 cm
Then cut them out

Step 3: Making the box

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Take one 15x5 piece and drill two holes for wires. 

Step 4: Sand

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Sand a little bit the details of the box and the LED lights, to have better light effect

Step 5: Gluex

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Glue together all the box details, except from the top part. 

Step 6: Light organ

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The headphones wire will have three wires. You will only need two. The general and left or right.
Connect everything according to the diagram. Before doing that pull the headphones wire thought the hole in the box.

Step 7: Finishing

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Glue down all of the wires and the top part of the box.
Your home light organ is ready

Step 8: Light organ

Picture of Light organ
Now plug it into your computer or ipod, turn on the music and enjoy.
vishalapr1 year ago
It would have been a lot nicer if you had used own photos :(
Although the idea is similar, same pictures make it almost the same thing to look at,
Motadacruz, Music LED box
rschechter1 year ago
Either your labels or you schematic picture is wrong. The base is not used to drive a load.

When you base your project on someone else's it is customary to get their permission, give them credit for it, and use your own pictures or credit them too.

To make this a 'value-added' instructable, try a dual organ using two colors of LEDs. Use one power supply, two LED strings, and two transistors so you can interpret both left and right channels of stereo.
This is just a copy of Motadacruz's instructable "Music LED Light Box", with exact same pictures. Original instructable is much better than this:
http://www.instructables.com/id/Music-LED-Light-Box/
phoe1 year ago
Forgive me for asking what's probably a dumb question, but if you've got this plugged into the headphone socket of the computer / ipod / stereo, where are you getting *your* audio from - since the connection to this will be diverting the output of whatever device you're playing the music on ? :-}
You can use a splitter and send the signal to the speakers and the light box. I haven't tried it, but it should work in theory.
Chickadees1 year ago
This is so cool! Tanks a lot for sharing.
oley121 year ago
can someone please tell me where I can buy the led lights and such at please?
ajarvis51 year ago
What if you split the audio cord, and added a Low Pass Crossover to one, and a High Pass Cross Over the the other, and built two of these? Then you'd have one for the bas, and another for the mids and highs :D
jtalvy1 year ago
What type of glue? Silicone?
jtalvy1 year ago
How do you cut the acrylic?
mriev1 year ago
Add 4 more LEDS and another transistor wired the same way, and hook one to the right channel and the other to the left channel. You get a much more interesting effect, especially on music with good stereo separation!
npham31 year ago
Just a copy of motadacruz's instructable which is posted long time ago.
http://www.instructables.com/id/Music-LED-Light-Box/
You guys better follow the original work.
Hey! Any reason you used the BD233 over the TIP31 that everyone else seems to use?
I attempted this project several times before with the TIP, but it was never succesful... barely only works when my audio output is at 100%.

And also, do you have all 6 LEDs lined up in series? because that would be insufficient voltage... i was wondering if you did a 3 series paralleled with another 3 series. MUCH THANKS
lucciu931 year ago
Hi, i have a questions.
where can i attack the headphones cable? One part on the box, and the other? On a pc, for example?
( sorry for my bad english )
Yes, one end into the box, and connected to the LED's, the other end (with the plug still on) can go into ANY heahphone socket.

You'll probably need a headphone splitter (has one plug, and two sockets - something like this: http://www.ebay.co.uk/itm/NEW-WHITE-HEADPHONE-EARPHONE-SPLITTER-Y-CABLE-3-5mm-/141031038580?pt=UK_Computing_Sound_Vision_Audio_Cables_Adapters&hash=item20d61ade74 on eBay UK) to actually still hear the music, though.
Only one color? How about use RBG LED (i dont now whats color came first)
Unfortunately, the fact that the LED's pulse means that an RGB LED would never get beyond its first colour. To use an RGB LED, you'd need a way to tune the Red, Green and Blue colours individually to specific frequency ranges - AND be able to trigger each one appropriately.
Farrit1 year ago
Without a resistor, won't you blow your LEDs?
Whilst it's always a good idea to use a resistor, if you look at step 6 of the 'ible three08 has linked to above, youll see that each LED can receive only a fraction over 3 volts - and since they only ever pulse, rather than being on constantly, things should be fine.
Nice idea - and it does look good.

I have a few suggestions, though:

It looks like you sanded both sides of your acrylic? If you only do the inside (and maybe some of the edges of the side- and end-panels), the shiny outer surface will (IMO) look better when it isn't in use.

You don't mention what glue you used. It looks like you used hot glue..? For a neater joint, you could try an acrylic cement.

Since you've only used one 'side' wire (left or right..?), I see no reason you couldn't repeat the process for the other 'side' (right or left..?) - Obviously, the 'ground' would have to split between the two - as would the power supply - but you could experiment with different-coloured led's for left and right, as well as pattern-making.

Speaking of colour, a coloured acrylic would make an interesting experiment, too.

Still, as I say, a nice project. Thanks for posting.
three081 year ago
This is not your work, most of it was lifted from motadacruz's Music LED Light Box instructable,including the video and most of the pictures....
http://www.instructables.com/id/Music-LED-Light-Box/
jduffy541 year ago
I believe the transistor pinout is reversed or flipped around. Most are BCE, but I believe that particular transistor is ECB (from the front). You might want to look at the data sheet, but I'm fairly sure it's not EBC, as few, if any packages except to-92 are.
rware11 year ago
You'll also need a resistor in there.
video is set to private. might want to change that so people can see it! lol good work :)