I trying to simulate the audio amplifier circuit http://www.allaboutcircuits.com/vol_6/chpt_6/10.html. but At the second stage, my opamp saturates. Any idea what could be wrong?
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, itU2 has no input resistor so it is acting as a comparator. Add a 2kΩ resistor in series with the output of U1.
If you look at the referenced circuit, it uses a pot for R2 which provides the resistance you are missing.
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