Other Parts Discussed in Thread: TL074H, TPA3116D2, TLV9054
Hi,
A problem in the attached circuit is the pop noise, that is heard in the speakers at the output of IC1, received at its input, perhaps from the incorrect design in AC. I think adding the elements shown in purple with a dashed line (capacitors 1.0uF and 22pF), could solve this problem. The noise appears only when the POT3, stereo potentiometer is turned or the IC7 and IC8 are digitally changed. When pins 1 and 8 of the digital pots are shortened, the noise disappears. I doubt that the change in impedance with decreasing / increasing internal resistance of IC7 and IC8 causes this noise.
I have another question:
Whether the use of autozero OPA scheme(shown below on left edge of a sheet) could solve the problem?
Regards,
Tsvetan