I had a problem making this circuit.

[qq91816]

Hello, friends

Today, I took this amplifier and tested it.

I found it at 500 hz; 1 Khz; 2 Khz seems to have low frequency phase forward problem.
Does it sound insufficient at high or low frequencies?

 

[jan.didden]

The sloping top and bottom is what you see with an AC coupled amp. It will disappear with DC coupling.
In the frequency domain it is shown as a low frequency roll-off.
Audible? Who knows!

Jan

 

[qq91816]

I think I understand what you mean!! Thank you, my dear friend.