Changed the capacitor to a 47uf giving a ~3Ω at 1khz, but all is still the same...but now acting as a perfect voltage follower
Then tried putting the same cap on the inverting input and again it'd amplify ok.
Then got sick of the same circuit and grabbed a lf353 from the bin, mounted the same circuit, but still the same problem, on invering input, amplification, on the non inverting, a voltage follower...i'm starting to think this is from the 600Ω output from the signal generator as i think, on those on the lab we use 75Ω output...can this be the prob?
The circuit is part of a microphone amplifier with Agc, it controls the gain with the help of a fet, that is not described on the circuit I posted, but i'm guessing the cap is there only to isolate the dc component, and just let pass the ac component of the signal.The resistor R3 is to try to eliminate the non idealities of the opamp.