Picture of Music LED Light Box

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

Picture of 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.

- 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.

- 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!

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Haha, it's amazing, thank you!

alex.laius.37 months ago

How do you get the cloudy look on the plexiglass? With sanding?

You can buy it already like that, or use glass frosting that you can buy at Home Depot to spray-on.

BritR6 months ago
Looks cool... Thanks :)

where can I purchase the small electrical wiring you are using in the instructions and the battery?

18V out of a 12V adapter?! Man that's not normal!

roofy995 years ago
 When I stripped my headphone cable it didn't look anything like the ones in your photo. I used an old pair of apple ipod headphones. They had 3-4 seperate strands but they weren't like wires like yours are. Am I using the wrong type of headphones, or what should i do to fix it?

Thank You
AiurI roofy998 months ago

Almost all headphones have other contacts etc. For example my headphones i stripped wire from have many little golden wires, then isolated 3 other ones, black, green and red (They are also gold after stripping)
So, i figured it out, that green is left headphone, red is right, black then has to be ground. Check inside of your separate headphones to see what cabeles come from / to them and You will probably know then, unless R and L are the same colors, but really You don't need to care about which channel is used.

same thing! have u figured it out?
melt the enamel with a small flame 'till they are gold colored then solder as normal
gabrielguy4 years ago
so 20 leds would be 60 volts!?D:
AiurI gabrielguy8 months ago

It's quite f...d up, it actually could be less than 60 volts. It depends on the type of LED diodes. I for example i could power 1 bigger LED 3v diode, so it could be bright enought with 2 3v batteries, because with only one it was dark. Also, i powered up 5 smaller 3v LED diodes using 1 3v battery and they were very bright. I am really confused about that.

in one line yes in bridge no :D
Reganne988 months ago
We built everything together just as it told us to do, but once we hook it up to the radio, or iPod, nothing happens. No music plays either. What are we doing wrong????
tamlani1 year ago

hey plz help me out. i am using 5m led flex roll with 12v adapter. plz guide me how many transmitter would i need as i am using one TIP31C but it doesn't work...

dinox4 tamlani9 months ago

i also could only find Tip31C it seems it needs higher input to work, mabye 5 watts speaker amplifier to work properly in my case...

it's transistor not transmitter. And one tip31C is all you need. However if you're 5m LED flex roll requires more than 12V to light up then you're going to see no light. Also keep in mind that the volume on your stereo must be high enough for the transistor to read a voltage coming in.

bswt1 year ago

i have a setup where i have 400leds wired in set of 4 so, 100 a group, could the tip31 switch them? or the better question would be, whats the max switching current (amps) tip31? if is more than 4-5amps than I'm fine. well i do have 3 here with me, so if it works than ill report it here.

Hey I was wondering how you were hooking up your power source. I am trying to connect about 30 LEDs for the right audio cable and 30 LEDs for the left audio cable and plugging them into a small mP3 port. I obiviously need another power source so I am trying to stay low cost and recycling an outlet plug but I don't know how to hook it up. I have made a small version of this with an LED each for the right and left audio cables hooked up to a 9V and it works fine but I don't know how to make it bigger.

look at this website . http://led.linear1.org/led.wiz . It is a LED series parallel array calculator .most leds use about 3 - 3.5v at 20ma. i like to use 12v for my power source, then just in put the amount of leds 30 for each side

when using the outlet plug, make sure it is DC and not AC. you can use a transformer to bring down the voltage to the right amount. now if you use one of the black wall transformer, on one of the wire wheres a white line going down, it is the negative. Im now one with words so if theres anything more you need ask

bswt bswt1 year ago

after doing some testing i've found that one tip31 can handle 100leds any more and the tip31 cant open well enough

RileyS1 bswt1 year ago

i used 300 leds and its not so bright how did u did u do it

if you are using 300 led then you should use 3 TIP31's
bswt RileyS11 year ago

i used 34 resistors total (33) 200ohm(1/4w) and (1) 470ohm (1/2w)

this only for 100 leds not 300

for 300 leds is would be (99) 200ohm(1/4w) and (3) 470ohm (1/2w)


there is alot more that i can't say here, i do have a schematic of 400leds

but i dont know how to uplead a file here and even if i did its a program file

so you would have to download the program. the schamatic is written in LTspice and its free

let me know if you would like the file, just tell me on where would like to be posted

o= led and r = resistor the first set is top to bottom then right to left

ooor ooor ooor

ooor ooor ooor

ooor ooor ooor

o. . . o . . .or

huyvu89 bswt1 year ago

how can we hear the music if the already plug the jack to the input sound?

use a 3.5mm audio splitter, plug the splitter into the music source, plug speakers/headphones into one side and the led cube into the other

Chris1107049 months ago
How does this work? The head phone jack plugs into what ? A phone if so how will it play the music the headphonejack silents the misic
cminton10 months ago

Would it be possible to wire together multiple boxes? If I wanted to build three light boxes of different colors, how would I hook them together to work with the same music?

tomikavagyok10 months ago

Hello ! I need some help , Im using BD243C transistor 6x 2V orange Led and 12 V dc power supply, but the leds are not flashing :/ i controlled everything and the circuit is okay. What to do now?

make sure to know your transistor before applying the circuit which is base , emitter

and collector ...so its better to use tip 31 transistor ...coz above picture is easy to follow....

DjukaETF11 months ago

Hi, can i use for example 8 LEDs on this one transistor and whether it will work as it should. Thank's!

JacquesN1 year ago

hello, can i leave out the voltage regulator and just add a big enough resistor?

its not a voltage regulator. it is a transistor
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

Search the web for an "Audio Splitter". That's what is needed to split the audio.

en_rov mmehzin1 year ago

You could wire another plug in parallel for AUX out

samzimmer11 months ago

Very cool!

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

really very nice ,this music light box are very fashionable .it is similar to the crystal loudspeaker ,which is made of crystal material ,but not acrylic material . And also i see a led light box ,which is made of acrylic material ,it is here http://www.displayonacrylic.com/product/LED%20Light%20Boxes.html

oliverb1231 year ago

thanks! https://www.youtube.com/watch?v=_It7GkDmDEo

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