I want to be able to amplify a signal using op-amps and a single power supply. In order for the op-amps to have maximum swing with a 12V power supply the AC input signal needs to be offsetted to 6V.
After constructing the circuit on a breadboard, the output was not what I expected. I expected the output of the amplifiers to have a wave that oscillates between 5V and 7V, centering at 6V. However, the output I measured was the wave centering at 9V and oscillating between 8V and 10V. The output of the first stage is correct though as I measured the wave oscillating between 5.9V to 6.1V, centering at 6V.
I believe my issue is that my resistor values in the op-amps are too large, therefore not enough current is being fed into the op-amps inputs. I was also thinking of using a linear/ switching regulator to source 6V. Could someone please explain why I'm getting these unexpected results?
Note: LT1006 op-amps aren't actually used in breadboard circuit. LM358's were used instead.