Hi, i've build this one from PicMaster, but on first attempt i got little firework with fog, both U1 and U2 are gone (cracked) :( does anyone have advice what can be wrong? i have C8 ~ 20000uF could it be due to power transistors? (transformer, and 2n3055 's are the only parts which survived from my last attempts) How can i troubleshoot it? a) can i remove OPAMPS? b) can i disconnect power transistors? c) what else i can do?