Answer / ramsan

oscillators can made by using op-amps. ex;wein bridge
oscillator. in instrumentation also uses. iin filters also
used as a subtractor. the unwanted is given to the inverting
terminal and total signal is given to the non inverting
terminal. output is wanted nothing but filtered.so answer is
all the above.

Answer / bhagwat

all of above

Answer / guest

Oscillators

Answer / unknown

Some circuits may use Positive feedback and Negative feedback around the same amplifier, for example Triangle wave oscillators and active filters

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