I am not sure but I made a pwm circuit with a 55 time ic and everything worked as thought when I had it connected to a breadboard. Recently I tried to put everything onto a PCB by soldering the connections myself. I double checked to make sure no solder was touching other connections on the pcb. I without thinking touced the neg wire from the pcb to the + of the 12v battery and the + of the pcb to the - or the battery. would this be the reason I smoked the 555 Timer CHIP??
Thanks
Thanks