in the attached circuit i use analog signal to drive buck converter by atmega8 and it was working well . i connected MCP617 on the same breadboard to measure current in the circuit using zero ohm resistor . supply for atmega8 and the op amp from lm7805 where the input for lm7805 is 12 volt which was used as supply for IR2112 . when i add the op amp circuit i forgot to connect the negative terminal of the load to pin 3(+ve input) of the op amp then i switched on the power supply or the battery .i couldn't even see any signal the driver got very hot and the op amp ,but the atmega 8 didn't get hot but there was no output from it. i don't know what happened ,why did i lose the three ICs