I'm sure you've all wanted this. The ability to have lights dance to your own music! They get brighter and dimmer as the music has more or less bass. Unlike this, there are no expensive parts or programming involved. This is a really simple guide that requires only about $5 of material and absolutely no soldering (unless you want to).
Things You Will NeedREQUIRED
6 LED's of the same color. If you're a beginner you'll probably need more because you will burn them out. ($1.50)
A transistor, this will amplify the signals sent from your iPod. There are many kinds almost any will work. ($2.00)
A resistor, more if you are a beginner. Anywhere from 375 to 425 Ohms will be fine.($0.50)
Some electrical wire.
3 AA batteries you may need more if you are using high voltage LED's.
1 pair of headphones that you can destroy.
A wire cutters
A small housing box for your project.
Some way to hold your batteries ( I used a remote from an old remote controlled car).
Read the tips and warnings at the bottom of this page.
Step 2one earphone and cut it off. Cut at the very highest so there is more wire to use. The other earphone can be cut off and attached to a speaker but this guide won't be covering that. Inside one of those earphone wires there should be two wires, separate them.
There you have it! Connect the wire from the earphone into a jack in your iPod or computer, crank up the volume and enjoy the light show.
Tips & WarningsThe negative cathode wire of an LED is always shorter.
The positive anode wire of an LED is always longer.
All transistors are not the same. Find out the base, emmiter, and collector of your transistor before you leave the store. If you don't it will be a real haggle trying to figure out which one is which.