Introduction: Sound Reactive Led Box

Picture of Sound Reactive Led Box

Here is a little drawing of how i wired the reactive led lights to a usb


ajmeerm1 (author)2017-03-11

Can i use a tip41C for this

snoopdog69 (author)2012-09-13

does your sound have to be at 100% in order for this to work

PallabD (author)snoopdog692016-10-22


pete54321 (author)snoopdog692012-09-25

no it doesn't. However, the louder your sound is the brighter/more reactive they will be. Pretty much every song has a a different level your volume should be at for them to be just right

mikemorana (author)2013-03-08

I need some help with the tip31 transistor. My application is for the display panel of an old audio receiver I'm revamping. After a healthy share of internet research (although not enough), I decided to go with the tip31c. Well - the receiver is an 80W receiver and when I cranked up the volume a bit, the transistor sizzled and burned. My guess is that the 40W power dissipation rating for the TIP31 transistors meant that my 80W receiver was gonna blow it to bits. Great analysis for Capt. Hindsight. So do I need to go with a different transistor or should I forego the effort?

mikemorana (author)mikemorana2013-05-21

hah! well now i know what i did wrong. My transistor needed a heatsink. :p
Noob fail.

PallabD (author)mikemorana2016-10-22

Hahaha comenting on a 3years old post, anyways try Tip122 its 100v & 5to8 A ,

tuck9117 (author)mikemorana2014-08-07


JacquesN (author)2015-11-30

hi i built this but when connecting the power up the led just stays on? pllease help!!

SlightlyPsycho (author)JacquesN2015-12-15

If they stay on, it means that you have cathode (negative) going to the LEDs and the anode (positive) going to the leg of the transistor. Just re-hook up the power with the positive going to the LEDs and the negative going to the transistor.

PallabD (author)2015-03-23

Can I use BC148 NPN Transistor for the same, plz reply

sangeeth.nipun (author)2014-10-02

everything works fine
but when i turn up the volume the bass goes crap when the lights are connected

and idea why........................

jonas27 (author)2013-12-29

I want to be able to plug in my phone to play the music.. And I would like the sound to come out of a stereo that has a AUX port. So if both my phone and stereo have AUX ports, can I replace the USB output with a AUX cable?

starfox707 (author)jonas272014-03-20

ya you can replace the USB with a AUX cable. I have no idea why he has a USB. You will need a spliter though for the output. I have one of the out puts going from my computer to my LED's and the other going to my speakers

KSwid (author)2012-11-27

This may be a stupid question...but, doesnt a USB port only put out 5v? So how would that power all 12 leds?

mikemorana (author)KSwid2013-03-08

You put the LEDs in parallel (as shown in the circuit diagram) which provides each LED with 5V. Youll need a resistor for each LED.

dđào (author)2013-01-17

when i cut my jack's line, there are only 2 lines (left and right channel) i cant figure out where is the ground line like in the picture. Can someone help me pls?

hnarsaria (author)2013-01-08

can a USB wire be enough to power all these LEDs i guess USB supplies on 5 volts of power.

It may be the most stupid question but I am pretty new to this

Agent South (author)2012-11-20

How can I replace the headphone jack with a condenser microphone

Agent South (author)Agent South2012-11-20


Xhfian (author)2012-10-09

Can i use a TIP35c for this experiment....

Rocketboy1213 (author)2012-04-29

If you wanted to make an 4x4x4 led cube sync with the music, how many volts would you need to power it?

pete54321 (author)Rocketboy12132012-09-25

If it's in series, assume each led is 3v so pretty much times the amount of leds you have by 3 and there's your voltage. In parallel voltage is constant along a circuit, so you would only need 3v, however your amps will need to be higher

smittaunk15 (author)2012-05-07

where does the usb and other wire goes to????????
And where i can get TIP 31 led

pete54321 (author)smittaunk152012-09-25

The negative wire of the USB goes to the right pin of the transistor, the positive wire from the USB is connected to the positive legs of the LEDS (in parallel)
I would recommend buying the transistor from ebay
or you can just search for one you like yourself, you could probably buy it from somewhere like jaycar

IKEtje (author)2012-06-12

is there a maximum of leds you can use becous i think in need 26 leds

pete54321 (author)IKEtje2012-09-25

I have 300 set up in parallel in my room which work just fine. What you'll need to do is check the voltage and amp ratings of the transistor you buy and make sure they're not exceeded by your power supply :)

da_tech_man (author)IKEtje2012-06-13

yes and no, the way this is wired in parallel the max is determined by the power supply and this being a usb port it can supply 100ma -500ma on some hubs, it really depends on that

- bottom line if you need 26 leds you have a shot, but you should split it into 2 sets of 13, its your best bet

blindrulz (author)2012-08-15

i have tried with tip31 n it worked well!! i fixed in ma Prado! i was just awesome!! now i wanna connect in ma Lexus so it should b standard!! but this time got tip 32!! can any1 please upload the circuit 4 tip 32??

pete54321 (author)blindrulz2012-09-25

I'm happy to be proven wrong, but i don't think this can be done with a tip 32 :/

Agent South (author)2012-09-11

Does it have to be a TIP 31 transistor or could it be any kind of NPN.

pete54321 (author)Agent South2012-09-25

It needs to be a tip31. any type of tip 31 will do. I personally have been using tip31c transistors.

elijah_rippington (author)2011-10-04

i have build the original circuit and it has worked great. I was wondering if there was a way to wire a microphone for this. i am looking to use this in a live setting since lighting set ups cost so much. I have already attempted but with no success, any ideas?

I would suggest replacing the 3.5mm headphone jack with a mic.

ps3techguy (author)2012-01-17

Umm do you wire the LEDs in series like neg to pos?

Adambowker98 (author)ps3techguy2012-06-24

No, they are wired in parallel. If you look at the wiring diagram, a positive wire runs through each of the positive legs of the LED and a negative wire runs through each of the negative legs of the LED.

Farash (author)2012-04-29

how can i connect all the LEDs to the wires?

ajmboarding (author)Farash2012-04-29

Solder and soldering gun

Farash (author)ajmboarding2012-04-30

can i make it without a soldering ??

Adambowker98 (author)Farash2012-06-24

Yes, twist everything together and then tape!

labalavermella (author)2011-10-28

hi!! i made the same with tip32 and the led are on only touching left or right or ground

Help!!! Thankss!! good prooject!!

I'm confused on your question

A TIP-32 Transistor is PNP, whereas the TIP-31 is NPN.
They are wired for different polarity in a circuit.

mps214 (author)2012-04-24

is the USB your power source into the wall?

ajmboarding (author)mps2142012-04-29

No computer, wall didn't work for me

link8853 (author)2012-01-06

will it work with a TIP 42?

vicsradios (author)link88532012-03-16

TIP-42 should not work as shown, since it is a PNP transistor and the TIP-31 is NPN.

autokhin010 (author)2012-02-24

so easy!!!

DJ-imani (author)2011-09-08

how do you make a switch so that you can change from music visualization to fade in out ..i think it would be a good idea

KevinAlien26 (author)2011-08-02

This should workwith a larger jack correct? My stereo system only has the larger one I'm not sure what exact size it is but I'm sure you know which I'm talking about

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