/diy/ - Do It Yourself

Hey guys, total noob here, i am trying to build this simple op-amp synth as my second project and it is not working. I get a faint buzz when i connect it to my amplifier (with tone) and it gets louder when i put my finger on one of the tone pot leads, but otherwise the filter section (LM 358 3,4 and 5) does not seem to be working correctly. I have rebuilt this according to the schematic 3 times now and i get the same result every time. Could this be because i am using a 300 mA adapter?