I just finished the casework and fastened in all the panel components, but I didn't have an opamp so it's still not complete. Yet, when I flip the power switch, the LED does not light. What's the deal? Should the LED light without the opamp in place? I hooked up 2 9 volt batteries in series just to let you know. I'm guessing that without the actual amp in place, I'm sending 18 volts directly into the LED. Please help!