I asked you because only you are claiming this circuit does not work, not esteban. If it does not work, it also appears you know nothing about the noise you are finding, or else you could easily answer.
Since you have no answers, I can assume you are detecting noise at more than 1 Hz, and you do not have a low pass filter that stops it. At least I can assume that until you decide to do some actual observation of what you were detecting and make a report that the noise was not more than 1 Hz.
Best wishes,
J_p
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