DIY: Making LEDs react to music (very cool to use as lighting inside your PC)

[siopao1984]

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MUSIC LED Box

The circuit can be modified to be placed inside your PC. This will look great on a smoked acrylic side panel



I will try to make the instructions so easy so that everyone with or without any experience can make one!

If you can make one, don't forget to share your end result photos and video with us.

Below you'll see the end result of the Music LED Light Box.

The movie is shot with a Canon Digital Camera, in the dark. The camera can't handle the fast switching between light and dark very well. In reality the effect is even nicer then on the video.



my own music reactive LED circuit tested on my mom's rig

[siopao1984]

Step 1
Materials & Tools



To make this Music LED Light Box you can use many different things and build it different ways.
In this instructable I'll explain how to make it, a very simple way.

Materials
- 12v Adapter (a battery can be used as well)
- 3.5 jack headphone cable.
- tip31 transistor (this is the key to the whole project) - costs around Php50
- 5mm LED's (the color or amount is totally up to you, 1 LED per 3v. If using 2v, so 4 LEDs in series or you can use the 5v output of the computer power supply) - costs around Php 10 to 35 depends on how bright the LEDs are
- A4 acrylic sheet - 3mm thick (also known as 'plexiglass') - you can purchase it at COMGLASCO
- Fine sandpaper (use 400) - Php20
- Electrical Wire / can also use shrink tube

If you see a price above, that means I bought it. The rest I just ripped of some old junk. The 12v Adapter was from an old wireless headphone and the 3.5 jack plug is from another old headphone.

Tools
- Jigsaw (also a Jeweler Saw can be used. But that's really hard to get straight lines)
- Glue Gun (hot glue, other glue to glue acrylic is possible)
- Drilling tool
- Solder tool (optional)
- Pen

Ones you've got this stuff you're ready to begin!

[siopao1984]

Step 2
Preparing the box (SKIP THIS STEP IF YOU ARE PLANNING TO PLACE THE LEDs INSIDE YOUR PC)









From the acrylic sheet we're going to build the box.

1. Draw out the plates for the box on the acrylic sheet (photo 1). The longer plates are 15cm x 5cm. And the squares are 5cm x 5cm. Of course you can use any size for a box you want.

2. Use the jig saw to cut the plates from the acrylic sheet. Be sure to do this as perfect as you can. Because all plates need to line up nice with each other (photo 2).
If the plates don't turn out to be equal, you can sand the sides till they all fit nice.

3. Get the drilling tool and use a drill bit that is the same size as the thickness of the headphones cord (photo 3). Then drill another hole for the adapter to go though.
When you're drilling, do this very carefully! You don't want to hurry, else you might put too much pressure on it and break the plate.

[siopao1984]

Step 3
Frosting and Diffusing











To get the nice 'glowing' effect with the LED box, we need to have a 'frosted' look on the box and need LED's that are diffused.

What we have as an example here is a water clear acrylic sheet and water clear LED's. For all those who have the same, continue with this step.

If you already have frosted acrylic (opal acrylic) or smoked acrylic and diffused LED's, then you can continue with step 4.

1. Get the fine sandpaper (400) and place it on a table, with the sanding side up. Get a plate and rub it over the sandpaper in a circular motion. If one side is frosted enough, turn the plate over and do the same with that side.
Now you'll have a nice frosted looking effect we need (photo 1 and 2 to see the difference).

2. Do the same with the LED's. Sand the LED's until they get the nice diffused look (Photo 3,4 and 5).

Photo 5 shows you 1 diffused and 1 water clear LED hooked on a 3v button cell.

[siopao1984]

Step 4
Building the box (SKIP THIS STEP IF YOU ARE PLANNING TO PLACE THE LEDs INSIDE YOUR PC)









Now we've got the plates for the box, we need to put them together.

Before you go and glue parts together, make sure first they fit nicely onto each other. We need all parts to fit nicely.


1. After fitting the plates get the glue gun and glue the first 3 plates together. If you have some trouble holding the plates together before gluing, you can use some tape to hold them together. This way you can put the glue on more relaxed.

After gluing the 3 plates you should have something like photo 2

2. After the glue is dried, it's time to glue in the side plates. First place them and see if they fit nicely.
If not sand the sides a bit so everything fits nice together. Then glue them on their place.

The last (bottom) plate will not be attached yet. We need to put the whole circuit on the bottom plate later and then put it in place.

At this moment you should have something like photo 3 and 4.

[siopao1984]

Step 5
Preparing the circuit








For those who have no experience in electronics whatsoever, this is the toughest part for you to find out.
Other instructables had no good explaining on this subject.

So for everyone who's new to this electronics stuff and have no idea what they're doing, here is some explaining for the circuit.

1. How many LED's to use?
The average LED needs 3v to work. If you are going to put the LED's in series (like in this tutorial) you need to calculate how many LED's you can use with your adapter.
The formula you can use is
adapter output voltage / LED voltage = Total LED's

So if you use a 12v adapter with the 3v LED's its: 12 / 3 = 4 LED's

You can also put LED's parallel in the circuit. But I'm not getting into this on this step, just so that this instructable stays simple and easy to understand for everyone. Let's just focus now on the LED's in series. I will create a different circuit for LED's in parallel connection later.
If you want to experience with more LED's, you can always calculate your LED's and resistors HERE.

2. The real voltage on a adapter.
Before you go ahead and build this circuit, it would be useful to measure the real voltage on the adapter. The sticker on the adapter (photo 1) says the output 12v. But sometimes if you hook it up on a multimeter, it shows that the actual output is around the 18v (photo 2).

So that means you can calculate the LED's again: 18 / 3 = 6 LED's.

Since in this instruction we are going to make the LED's in series, we can use 6 LED's in the circuit.

3. The 3.5 audio jack plug
Which wire is what?
As you can see on photo 3, the plug itself has 3 metal parts, and 3 wires in the black protective layer.
On the photo it is explained which wire is what.


Now with this information you can go to the next step, building the circuit.

[siopao1984]

Step 6
Building the circuit













Many people get scared when they see all those weird circuits with those symbols on it. Having no clue what they mean.

1. Make sure you have all the materials to make the circuit. And enough electrical wires to connect all the components.

2. Before we build the circuit, we first need to put the audio cable through the whole in the back.

3. Build your circuit, and test it out. The best way to test it is through your audio output from your computer. Make sure the audio on your computer is set to 100% and then test it.

Circuit: The positive pole from the adapter goes to the positive leg of the first LED. Next the other 5 LED's follow. Hook the negative leg from the first LED to the positive leg of the second LED. Hook the negative leg from the second LED to the positive leg of the third LED, and so on. The negative LED from the last LED goes to the center pin of the TIP31.
Then hook the right pin of the TIP31 to the negative pole of the adapter.
All there's left now is to hook up the audio cable. Hook the red or the white wire from the audio cable on the left pin of the TIP31. And connect the ground wire from the audio cable to the right pin of the TIP31.

For better details please see photo 1, the circuit.

4. If your circuit works, solder all components together so the circuit stays together nice and strong and wont fall apart.

When done with these steps it's time to finish up!

If you have trouble getting the circuit to work, you can try to set it up first on a circuit board.
Carlosserious was so kind to make a how-to video on making the circuit, below is the video.

[siopao1984]

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 or you can place the LED circuit inside your computer case.

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

I hope that this DIY is easy to understand.

If you have any questions please don't be shy and comment below.





... I will post a different circuit for parallel connection

I hope master KH0UJ and the rest of you guys could also contribute alternative circuit / diagrams.

[Morcego]

nindot ni...
share unya mo sa inyo diagram mga masters..

[3kster]

nindota ani da,.. hahaha,.. labaw na pang battlefield/COD or pang sound3p lang sa balay, thanks for sharing boss siops,...
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