Identify the circuit which is not the application of op-amp.

This question was previously asked in
RRB ALP Electronics Mechanic 23 Jan 2019 Official Paper (Shift 3)
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  1. Mixer
  2. Differentiator
  3. Integrator
  4. Comparator

Answer (Detailed Solution Below)

Option 1 : Mixer
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A mixer, or frequency mixer, is an electrical circuit that creates new frequencies from two signals applied to it.

In its most common application, two signals are applied to a mixer, and it produces new signals at the sum and difference of the original frequencies.

A mixer is not an application of Operational amplifier. 

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