It's RC4558 topology, another cheap classic opamp and more suited for audio. But I admit that in the case of fake 5532 I'm not entirely sure if it's an off the shelf die because it's just so tiny. I don't know if it meets the power dissipation specs of a real 4558 and for how long
Though on the second thought, some discrete transistors are even smaller, so who knows, perhaps it is a legit 4558 rather than a custom job.
But you are right, going for custom tiny underpowered and oversimplified designs will probably be the final step required to break the magic 10 cent barrier
Just tried, no luck, same thing. How could this help exactly ?
By biasing the output in class A. But the current conducted by the resistor at all time needs to be higher than the output current of the entire circuit. What kind of load is this opamp driving and what are the supply voltages?