Hello, I'm looking to amplify a very weak AC signal using op-amps. The problem I'm running into is that I can only operate using a +5V supply voltage, no negative voltages. My AC signal is about 5mV and I need it to be about +2.5V. The AC signal is initally DC baised and is at +3.5V, so I put a DC blocking capacitor and used a voltage divider to put the AC signal at a +2.5V virtual ground. When I apply the signal with a gain of 101 (negative feedback, non-inverting amplifer) with op-amps the output AC signal is very weak. Another problem is that once I put the bias voltage on it the input becomes evn weaker and isn't baised properly.