Hi, I made the inverter circuit as shown. But I used irfz44n Mosfet and a 7.6 - 0 7.6v transformer. First to make sure the circuit was working I tried with a 9v battery and then got the output of 121v. Then I connected to a used hybrid battery pack of around 15.8v. Suddenly a spark came from the circuit I think now the MOSFETs are blown. Can u guys figure out what's wrong? I am waiting for a quick reply!! Thank You!!