The way that i did my PSP was i hooked the positive and negitive side of the LED wires to the Positive and negitive side of the PSP slim's
speakers, but if you aren't careful you have the posibility of ruining your PSP.
a cool feture with hooking you LED lights to the PSP's speakers is that if you are listening to music ao playing a game (without headphones)
the LED lights will pulse to the beat of your music!!