Instructables

How to make LED Lights flash to music in a car.

Picture of How to make LED Lights flash to music in a car.
This Instructable will show you how to make a LED Controller that can be directly wired to a car sub woofer amplifier or standard speaker output. It is constructed entirely of recycled parts and may cost you nothing.

I chose to make this Instructable as I was unable to find a device similar to this available for purchase

A Video of it in action is attached as it takes too long to convert. You probably need Quicktime or VLC.

The controller uses a 12V SLA battery and a transistor to control when the lights should be active by monitoring the speaker output. It works best when wired to a subwoofer as it only activates the lights when a beat is present.

You will need:

A box to put it in (I used an old Pioneer home theater speaker)
A Heavy Duty Transistor( The transistor I used was a ST W14NC50 from an old Compaq power supply unit)
Wire
A soldering iron
A switch (optional)
3 Speaker input ports(don't know what their actually called)
A 12 Battery. (Make sure the voltage isn't to high over 12V as you may blow the LED's)

Step 1: Constructing and soldering the circuit

Picture of Constructing and soldering the circuit
Construct and solder the circuit using the transistor you have sourced. It is best if the transistor is attached to a heatsink in order to prevent it from overheating and failing.

Step 2: Test the circuit.

Picture of Test the circuit.
transistor.png

To test the circuit find a battery with a 12v charge. Connect it to the red and black wires. Connect the two orange or amplifier wires to a smaller battery such as a 3V computer battery. If all goes well the LED's will light up. If not, try reversing the polarity of the 12V LED strips or testing them with the battery itself.

Step 3: Making it look nice.

Picture of Making it look nice.
IMG263.jpg

In order to make it look neater and to easily mount it within a car you should mount it within a box. I used an old speaker as it already had a port that could be used to wire the LED's into. Any small box should do though.
 
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jules151 year ago
you sir are awesome :D
btw its called "diamond plate" lol
jnowland1 year ago
Do us a favor and make a video of you making it please. Also im hooking it up to my subs in my house, so it will only light up when the sub is going but i plan on adding other lights to the regular speakers to.
EET19822 years ago
Hi I really like your 'ible, I don't have a subwoofer or an amp in my truck
Would I just find a wire the outputs to any speaker and tap into that? Thanks in advance for your reply, or anyone's.
emotec2 years ago
Here is a simple addition to your circuit to provide voltage regulation.

emotec
Voltage Regulator1B.jpg
emotec2 years ago
F.Y.I. --- good quaility and reasonably fast video conversion program free here:
http://download.cnet.com/FormatFactory/3000-2194_4-10968547.html?tag=mncol;1 Using this only took about 40 secs to make your video into .avi format that will play on windows media player. I have attached the result to this comment so it's ready for other readers to view. You have my permision to cut it from my comment and add it to your instructable if you like!!Also, I agree that you should add a voltage regulation curcuit to your design between your battery negitive and your transister to prevent an overload to your leds and burning them out prematurely. Otherwise,nice able! Happy brainstroming!

Quote of the day--"Pirates are always cooler than Ninjas"

G'day mates
Emotec
fastcar1232 years ago
you sould put in some sort of voltage regulator. normally in a car the alternator will push the overall voltage as high 15 vols which could result in blown LEDs. of course a resistor works just as well or even a relay connected to the REM the has a resistor iat the end of it. I may be able to draw u a schematic but honestly im just thinking out loud here.

anyway great instructible! I will definatly look into building this for my soon-to-be sub system for my car
alexmang (author)  fastcar1232 years ago
Thanks for that, I forgot about the varying voltage. Was also thinking that you could just use an external battery such as a small SLA 12v and you would not have to rely on cars varying voltage,
True. What you could do as well is just get like a 12v battery charger and use that for the power source. I would think that would have a voltage regulator as well