Sound reactive LED's are pretty cool, but you may be wondering what they are. Well there ordinary LED's Just Hooked up to a Transistor to make them flash to the beat of anything electrical. I think its coolest to use it hooked up to music. So I did some experimenting and found out that its possible with the help of a Tip31 transistor. (You can buy these at Radio Shack).
So I got my sound reactive LED's to work and i thought these are cool but there kinds boring. So I wanted to think of something more creative to do with them. So I installed them into my computer desk. i also put a switch box with a main power on/off (slide) switch so they would either be lit or not lit. But the interesting thing is that I put another switch (toggle) on the box. The other switch acts as a on/on switch so the LED's will be sound reactive,or have a solid light. I also installed a potentiometer in the box to resist how much power the LED's will intake while playing music so I don't fry them.
Step 1: Supplies
for exactly what I did you will need:
12V DC Wall transformer
On/off slide switch
On/On toggle switch
100 ohm potentiometer
20 ft of 22/2 gauge wire
Green and Blue LED'S
(I used standard Green LED's But High Power Blue LED's)
Step 2: Constuction
Ok work with this schematic and start from there.
However I added 2 more High power blue LED's in addition to these and there are 15 green LED's in bunches of 3 to a resistor. You will have to find out the number of ohm you need per resistor depending on your LED power usage. You can find this at http://led.linear1.org/led.wiz.
Step 3: INSTALATION
I installed 9 green LED's above my two monitors on my desk another 3 on each side of the monitors and finally the last 2 high power Blue LEDS behind my monitors so there would be a blue grow fade. I strung all the wires and ugly cords behind my desk.
Now of course these grow to the beat of music but I couldn't show that because i don't think I can upload videos.
Step 4: STUCK
Of course every ones project is a little bit different so some people may run into walls on this. if so i am happy to help you.
wildbeaver635 made it!