I was watching this great OpAmp video by EEVblog and there I was not able to figure out the reason for the bump in the virtual ground point with lower resistances.
link-

@48:31
Pls, help me with this!!

 

What bump where?

 

Crossover?

 

Yep, the LM358 suffers from crossover distortions. Just wait for @Audioguru to show up and rail about this chip - he'll tell you it is not the best choice (it's a horrible choice) for audio of even reasonable quality.

 

Yep, the LM358 suffers from crossover distortions. Just wait for @Audioguru to show up and rail about this chip - he'll tell you it is not the best choice (it's a horrible choice) for audio of even reasonable quality.

I'll do it for him - it's a dreadful device. Never use it for audio. There are so many better op-amps for audio.

 

But are there cheaper ones?

You can reduce the crossover distortion if not eliminate it by connecting a resistor from the output of the LM324/LM358 to its negative power supply terminal. This worked very well for me when buffering a low distortion 1 kHz sine wave. Driving a capacitive load might require a lower resistor value, or a better opamp.

 

The LM358 dual and LM324 quad opamps are the only opamps I have seen that produce crossover distortion that is huge at low output levels and high gain. also they are noisy and have a poor slew rate that restricts frequencies above 2kHz at high levels.

I used Motorola MC3317x single, dual and quad opamps instead for very low current single supply opamps that produce no crossover distortion and I have never added a resistor to the output of an LM358 to make it "a heater" without crossover distortion.

 

The 4558 is a good replacement for the LM358. It has the same pin-out. It has low noise level, no crossover distortion.and 3MHz bandwidth.

 

For audio, the NE5532 is now cheap.

 

LM833 or TL072 will work for audio as well.

 

Not forgetting the MC33078, Motorola's answer to National's LM833.