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Re: What is function of R5(3.32K) in below opamp based circuit ?
It depends on what the circuit drives next. The most likely reason is it's there to isolate the output of the op-amp from a reactive load. If it was left out and a capacitive load or an inductive load was applied it could make the circuit unstable or too much output current might flow. Placing it inside the feedback loop helps to counteract the voltage drop across R5 so the DC stability is maintained.