My question is open ended, but I provided an example to explain the question better. R19 and R8 in the middle of the pic form a negative feedback loop. They set the gain of the amplifier.
I need to decouple the NFL in DC, in order not to fry the circuit, but if I add capacitor, Q2 will not be powered on.
My first idea was to add a voltage divider to bias Q2 to it's value, but that doesn't work, because it screws up all the calculations for the NFL.
I actually need to build this and our professor said it's probably to hard to do, but I'm asking to see if anyone has any ideas.
EDIT: Added a pic without the currents and voltages.