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?

 

I see no saturation. U1 swings from +1.5V to -1.5V.

U2 is sitting at 0V

The emitter follower is following... (It wouldn't if it had a load because it is not biased right).

 

Could you check the output current. it should be sine wave (maybe with crossover distortion), i currently get a square signal.
Also, can i leave the follower biased this way?

 

Could you check the output current. it should be sinusoidal (maybe with crossover distortion), i currently get a square signal.
Also, can i leave the follower biased this way?

Are you asking about the audio.asc file you posted, or something else?

 

Your audio.asc circuit has only a passing resemblance to the circuit you referenced.
Why don't you simulate the referenced circuit?

 

Your audio.asc circuit has only a passing resemblance to the circuit you referenced.
Why don't you simulate the referenced circuit?

Here is the final circuit. I still get the same results.

 

U2 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.

 

Awesome, it solves the problem . I have an amplified sine wave but there some little deformation around 0

U2 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.

, it