Introduction: LEDs Sync to Music (with Pics of My Awesome Computer Case Mod)

Picture of LEDs Sync to Music (with Pics of My Awesome Computer Case Mod)

 I'm finishing up my computer table i've been working on and one of the final touches is making LEDs sync to the speakers.  I have some pics of my computer too.  This project took me about 15 minutes and was free because i had the parts laying around.  

Step 1: Materials

Picture of Materials


-TIP31 transistor

-4 LEDs or 12v led strips


-on/off switch

-3.5mm jacks (1 male and 1 female)



-soldering iron

-wire strippers/cutters

Step 2: Build the Circuit

Picture of Build the Circuit

 Here is the circuit i used.  For the 12v power supply i found a spare molex connector from the computer power supply and cut it. I used a multi meter to find which 2 was the positive and negative.  (for me the yellow was positive and the black wire beside it was negative).  Be careful when doing this and make sure the computer is off to prevent the risk of electric shock. (im not responsible if you get shocked or hurt).   If you have any questions just comment below.

Step 3: Hooking It Up

Picture of Hooking It Up

Plug in the computer speakers into the audio jack and plug in the male audio jack from the circuit into where you would normally plug in the speakers.   Mount the LEDs and switch.  Now turn it on and put some music on.  

Step 4: Pics of My Computer and Vids of Lights Working

Picture of Pics of My Computer and Vids of Lights Working

 I'm going to finish it when i get some glass, i just have to put a back and top on it and put a piece of glass over the screen. please rate and comment. (:


ShaneS102 (author)2016-10-30

i get a bad crackle like distortion from sound, the lights work but yeah i cant handle how bad the sound becomes with it on, how do i fix it?

najibg96 (author)2011-04-13


another question:

i bought an TIP31C transitor

this transistor also good??

musick_08 (author)najibg962011-04-13

well i havn't used it before, but yeah i think it should work. ive read things about where people have used them

mossDboss (author)musick_082012-04-20

my experience is that several different transistor will work.

xDGx (author)2011-03-03

This is great, works fine here.
I want it to pulse with the bass *only*. Is there a way to make a filter for it ? thanks

mossDboss (author)xDGx2012-04-20

Yes, there are ways to "pulse" bass only or rather to "pulse" at a certain frequency. To achieve a pulse a certain frequency you need the correct IC, Capacitors and Resistors, you also need to know how to connect it all - I know how to read a schematic and set up a circuit, but I do not know how to achieve a certain "pass filter' without someone telling me the capacitor and resistor values.

musick_08 (author)xDGx2011-03-03

Hmm honestly I'm not sure. I guess you could connect only a subwoofer or something to this to get the effect. But i don't know of a filter or anything

m.hashemi (author)2012-03-18

hello to all

waldo55 (author)2011-06-28

Thank you for making this instructable i tried this out and it worked grate. one thing i used this diagram in making a led synced music cabinet the only difference is my leds are in parallel and the power supply is only 5v well when the bass hits and the leds go off i get some weird distortion in the music just wondering if any one knows what i did wrong

najibg96 (author)2011-03-23

what will be if i don't put an on/of switch

musick_08 (author)najibg962011-03-23

if you dont put on an on/off switch then it will be always be on

najibg96 (author)2011-03-23


najibg96 (author)2011-03-23

you are here??

najibg96 (author)2011-03-23


computer_guy (author)2010-08-15

I hope you know better than to touch the inside of the power supply..

musick_08 (author)computer_guy2010-08-16

Yeah, its just common sense. all i did was take the top off of it for better cooling.

Drasa (author)musick_082011-01-27

Whoa dude you have some balls to do that! Anyways, nice tutorial, may try to do it in the future!

musick_08 (author)Drasa2011-01-28

Haha thanks

Drasa (author)musick_082011-02-04

You're welcome!

computer_guy (author)musick_082010-08-16

haha good, good.

musick_08 (author)computer_guy2011-01-28


jasongroupindustries (author)2011-01-03

Hi, would like to know. I've not seen any resistor in the supply line of the led. you did not use any.

I know, I just didn't have any spare laying around and didn't feel like buying any at the moment

ertxz18 (author)2010-12-16

Love your tutorial, however, can you please post a more specific diagram of the circuit, to be especific the audio jack and plug and those are supposed to be wired. Thanks!

musick_08 (author)ertxz182010-12-17

I will try to post one here soon, but they are wired in parallel. Idk if that helps much or not?

ertxz18 (author)musick_082010-12-17

Thanks, it does help, since I didnt see a hot wire coming from the plug I was wondering what had happened to me. I thought maybe you meant in series but accidently wrote parallel or something since there was no hot. Thanks for the explanation, its working great now :D

musick_08 (author)ertxz182010-12-17

Lol yeah I should've made that more clear. But your welcome, glad to hear it's working :D

Kruegem (author)2010-08-26

pics are pretty fuzzy

musick_08 (author)Kruegem2010-09-03

yeah sorry about that, i had to take them with my phone

junits15 (author)2010-06-14

that isn't your main it?

musick_08 (author)junits152010-06-14

haha yeah

junits15 (author)musick_082010-06-15

looks kinda hard to use, but its still cool

musick_08 (author)junits152010-06-15

how does it look hard to use?

junits15 (author)musick_082010-06-16

not entirely, but I like a computer at a desk....just my opinion though.

musick_08 (author)junits152010-06-16

oh ok

wee_man (author)2010-06-01

Looks cool.  But where is the keyboard?  Or is it a keyboard less media station.

musick_08 (author)wee_man2010-06-02

 Well i have a keyboard i plug into the usb ports in the front, but i have the wii whiteboard on it so i dont really need a mouse or keyboard.  

zack247 (author)2010-05-30

i like your computer! i have been wanting to build my own for a while, other than wood or plexiglass, what is something good to build with?

musick_08 (author)zack2472010-05-30

 Thanks! well you could use a lot of stuff. you could probably use metal, but i would look around and see what you have laying around or go to a hardware store and see what kind of materials you find.  my step dad is a carpenter so we had wood laying around in the garage that i used.

zack247 (author)musick_082010-05-30

i was wondering because i have a intel motherboard with a pentium D, and i know that anything with a heatsink this large must generate some sort of heat. i saw once a sheet of 1/8" thick diffused light paneling, im thinking of trying that, especially considering it was only $14.99 for a large sheet

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