I am somewhat a noob with electronics. I do understand some stuff to an extent and can follow logic but this goes beyond my full understanding.
I have an audio system that I would like to modify in order to increase the output gain of it and increase the audio signal strength. I have a basic understanding of OpAmps after reading and watching some YouTube videos but I am not sure 100% about the circuit below.
My understanding is that depending on the configuration of the feedback loop, you make the OpAmp to behave as unity gain buffer or as an actual amplifier (nevermind the other tons of ways to use OpAmps). In the circuit below notice that it has a 680 pF cap (C72) in the feedback loop. What is the purpose of this cap? Is this in effect a unity gain configuration?
If I wanted to increase the gain, could I replace that cap with a resistor of "x" value?
I need to be 100% certain before attempting any modification, this are SMD components and quite small. If I go through this trouble I am hoping it will be a one way street (measure twice cut once).