#1
Does anyone know what kind of circuit i need to use for a chorus pedal build?
Or at least, can anyone explain me what I need the circuit to do for the chorus effect?
#2
A bucket bridge delay chip and a clock chip for it (for an analog chorus), or you could probably do it with a digital DSP chip of some kind.

chorus explained:
http://www.harmony-central.com/Effects/Articles/Chorus/


there is a project for a Boss CE2 on www.tonepad.com (you just have to find a place to buy the ICs used as they are rather rare)


I'd advise against building something like this unless you know what you're doing (relatively....)
#3
My brother is an electric engineer so he will help me to know what I'm doing lol.....

I only want the delaying chorus effect with a very small change in the pitch of the wave.....
#4
Chours are hard dude. You'd be better off buying one. But if you want to, you can always do it.