Other Parts Discussed in Thread: OPA210
My customer met a problem using NE5532P, here is the schematic and waveform about the output.
You can see the output has ripple. Do you have any good advice?
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That's oscillation due to phase lag in the feedback. 390k is a high resistance; so even a small capacitance for input pin and circuit board will create a stability issue. As a test, try soldering a 4pF to 22pF capacitor on top of R225.
To fix without a board change (to add such a cap), try changing feedback resistors from [390k, 100k] to [39k, 10k]
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