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My original LED light cube got allot of reactions. Some of them where about making the LED's react to music. This did sound very interesting and I found some instructables on here.
Unfortunately I found it very hard to understand those instructables. In my opinion they weren't explained well enough and even some circuits weren't correct.

That's why I though I build one and make an instructable of it. I tried to make this instructable so easy, that everyone with or without any experience can make one!

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

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

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



Before people go asking who's music or what songs these are in this video, these beats are made by my brother.  :)
You can visit his website www.motabeatz.com or  YouTube channel for more information and songs.

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 I made 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) - $0.50
- 5mm LED's (the color or amount is totally up to you, 1 LED per 3v. I used 12v, so 4 LEDs) - $0.28
- A4 acrylic sheet - 3mm thick (also known as 'plexiglass') - $2.00
- Fine sandpaper (I used 400) - $1.00
- Electrical Wire

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!


<p>What kind of tip31 transistor should I choose? Is it tip31c? </p>
Hello there,<br>Its an awesome project. But i would like to add something to the circuit if you guys dont mind. :)<br>The thing is for this circuit you have to give an input to it via 3.5mm jack.<br>But using my mod you can use this circuit to make a portable beat sensing light box. Place it on a table when music is being played and the box will response to beats on its own without connecting any cables.<br><br>Hope it helps.<br><br>Regards :)
<p>What kind of capacitor should I use? can you take a photo of your circuit for me please :D thankss</p>
<p>sir......what u suggested was exactly what i was looking for......can i have some assistance from you?</p>
Yes , ofcourse :) always happy to help in circuits :)
<p>awesome :) is there a easier way i can communicate with u? btw i want to use <a href="http://www.parallax.com/product/29132" rel="nofollow">Parallax Sound Impact Sensor</a> as the sound ssensor...can that be used?</p>
<p>the thing is , if you use the sound impact sensor , it will obviously work better in detecting the sound. but the output of that module is either 0 or 5volts. But think for the case if there is a continuous signal of sound. then the module will activate for the 1st time when it excites. </p><p>it can be used for the strobe effects. connect the signal output of the module to one side of the transistor. and it should work :) <br><br>and one more thing.<br>the module is a bit costly in india its about 500 rs <br>but lm386 costs 10 rs :P so in cost effective way, i would suggest the 386 ... :)</p>
<p>i got the lm3866 :) so let me get this straight...what is the speaker for....doesnt the lm386 pick up sounds or no? :/</p>
<p>any speaker can act as a microphone.<br>the circuit which i have given for lm386 is a very basic circuit for making it amplify a received signal.<br>here the speaker is acting as an input mic which will pickup the audio which will then be amplified by 386 and then sent to the transistor to act as a activator. i hope it helps :) </p>
<p>ahhhhh i understand i see i see....let me show a list of all the things i have </p><p>-386</p><p>-4 multicolour led lights</p><p>-TIP31c</p><p>-some 120 ohm resistors...</p><p>what else do i need to have everything i need....just a small speaker now?</p>
<p>i also have a 9v battery and its connector and the sand paper and a casing to put it in</p>
<p>i guess then you are totally ready to begin the project :)</p><p>The small speaker can be gathered from broken head phones if you are worried about it :)</p><p>Happy building :)</p>
<p>How would i do this project with RGB leds?</p><p>Any help would be apprappreciated.</p>
<p>guys I could not find tip 31 ...but i bought tip41.. Can I use it like normal ...or I have to get tip 32?</p>
<p>any NPN transistor will do... Its main purpose is to act like a switch.</p>
<p>31*</p>
<p>I included the lyrics to Bob Dylan&rsquo;s &ldquo;Like A Rolling Stone&rdquo; in the scene where all the psych patients have music therapy. </p><br> <a href="http://bit.ly/1JaHbnt" rel="nofollow">http://bit.ly/1JaHbnt</a>
i have same question as @sahul hameeds. can tip41c transistor be used in place of tip31????
<p>cani use tip41c transistor for this project? what is difference between tip31c and tip41c usage?</p>
<p>CAN SOMEONE PLEASE HELP!!!</p><p>I am doing this as a project for my engineering class and I have little to no knowledge of circuitry. Anyway I built the whole circuit EXACTLY as it is shown but for some reason when I plug the Aux cord into my phone or computer it turns on the LED lights even if no music plays. So you can barely tell they are blinking in accordance with the sound because the light is already on. It would be like trying to use a strobe light in a room that is already completely lit. Can somebody please help me!</p>
Are you sure about the polarity of the transistor(the three leged thing)?<br><br>Or it might be that the points in the 3.5mm jack are having an error.<br><br>Or there is a connection problem to the 3.5 mm slots.<br><br>Or there might have been a short @ the transistor connection.<br><br>Hope it helps :)
<p>You should mask each seam with green painters tape before slathering on the silicone/glue. Smooth the stuff to very thin layer by time it reaches tape on each side of joint (perhaps leave 1/8&quot; between seam and tape).</p><p>Once set up, pull the tape off and you'll have MUCH nicer looking fit and finish vs globs.</p><p>I'd also recommend drilling the hole on the bottom and adding feet</p>
<p>Can i use any other npn transistor for this project?</p>
<p>Hi. Very nice project and very well explained. I would like to make something similar, but instead of working with an audio cable, i would like to work with a music box (something like this http://www.klockit.com/products/dept-166__sku-GGGKK.html). Would that be possible and how? Thanks!</p>
<p>I made it, I use 2 channels, four LEDs each Channels.</p><p>Here is the video</p><p><iframe allowfullscreen="" frameborder="0" height="281" src="//www.youtube.com/embed/b17zd35TTKs" width="500"></iframe></p>
<p>Hi man this visualizer is amazing, but regarding the headset cable which is 3.5 jack I already cut it off but i have 4 wires one of them is red, is this red wire needed?</p><p>And is there any other components required like resistors for example? (like the diagram below)</p>
<p>I created another music led, but this type with band pass filter. Watch at my demo.</p><p>https://www.youtube.com/watch?v=xnMQG-hF-ho</p>
<p>Thats nice keep going on :D</p>
<p>&lt;iframe width=&quot;560&quot; height=&quot;315&quot; src=&quot;https://www.youtube.com/embed/xnMQG-hF-ho?rel=0&quot; frameborder=&quot;0&quot; allowfullscreen&gt;&lt;/iframe&gt;</p>
<p>Very cool! Are you splitting left and right channels from the audio and then using two tip31 transitstors? Are you using a 24V power supply or is there a better way to fire up that many lights?</p>
<p>Yes I am splitting them L&amp;R with 12V powersupply, you can try two parallel the additional LED that you want as long as your power source can support it.</p>
<p>Hey my LED's have an earth in the middle of the + and - ... how do I earth them? I got this working years ago but trying to do it properly now but the lights I got have 3 conections.</p>
Also I'm not familiar with working with LED how did they hook them up together? With a wire or did the just twist the legs together?
<p>anybody have any idea on how i can integrate speakers into the box?</p>
LEDs r glowing very dim evn at the maximum volume. Any solution to bump the brightness to the maximum ? Thanks in advance <br>
<p>hello,<br>question is the music coming out from the speakers from the computer right not from a speaker integrated to the box,btw music is so cool!</p>
<p>Hey guys, I've been looking at this for a while and have some Ikea LED lights lying around at home, some RGB ones with a wired remote and have been testing them to see which parts control the positive and negative ones and opened up the splitter to see how it would be possible to have two TIP31 chips to control left and right but after looking into it, I struggle to see how to do that since the connectors to the LEDs have 4 pins each so I'm not sure where to go from this, I could simply only have left or right for all but why do it simply when it can be complicated ^^ Anyway, if anyone can help me out with this then thanks a lot and if the only possible thing to do is buy a new set of LEDs then so be it (but I'd rather not have to). Thanks a lot everyone :)</p>
<p>where is the circuit?</p>
I know this is a dumb question, but how do you keep from burning out the LEDs? Does it just evenly disperse? <br><br>Say i hooked the whole thing up to a cigarette lighter....<br>
Would substituting the individual leds with a led single color light strip, work?
Can i use my broken flat screen to do this?
<p>I made this(pics of the box will be posted later) instead I used 4 LED's (red,green,red,green) with a 12v 3.33a power supply. The reds are slightly brighter due to their lower forward voltage rating, compared to the greens. With this circuit, I tend to keep my volume low but higher on my headset. An with my HD Realtek Audio driver, I'm able to have multiple outputs, allowing me to plug my array in and not have to use a Y splitter. Again, I will soon post pics of my project. </p>
<p>Also, this is one of the best projects that I can say &quot;time well spent.&quot;</p>
Very awesome project. I did get it to successfully work; however, I also have the audio hooked up to an amp and the only way the LED will work is if the volume is maxed. I don't have any way to control the amp volume so it's really loud. Anyone have an idea how to up the signal to the LED's without increasing it to the amp? Thank you!
<p>someone plz tell me what kind of old material does have tip31c ?</p>
<p>u cant salvege that kind of part but there like 1.20$ at radio shack or</p><p><a href="http://www.amazon.com/gp/offer-listing/B0002ZPZYO/ref=dp_olp_new?ie=UTF8&condition=new" rel="nofollow">http://www.amazon.com/gp/offer-listing/B0002ZPZYO/...</a></p>
<p>copy cat u copyed this from the diy popular scinces book </p>
<p>someone plz tell me what kind of old material does have tip31c ?</p>
<p>thanks..can i connect the circuit in 230 volt ac by using ac to dc circuit.....? pls give me the ac to dc circuit.. my email:gokulindianur8@gmail.com</p>

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