Looking for any ideas. I just built an O2 portable amp and it powers on, but it is not passing audio. Only a loud clicking sound. I checked everything and it seems fine. 

Hey everyone, I'm looking to build an O2 amp, and have seen a few different kits. I have looked around but am not seeing anything on which one (if any) is better.    http://www.jdslabs.com/products/82/objective2-diy-kit/   http://www.headnhifi.com/diy-kits/o2-kit-full     If this has been...