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Goodafternoon, Please don't kill me, I'm a civil engineer I'm working on my thesis and as a part of the project I have to do this circuit where: - I have to take the output of piezoelectric and amplify it until a certain value (here trying with ltspice I've done until 3V); - I have to take this amplified signal and put it into an ADC machine - Now that the signal is in digit i have to put it into the arduino the question is: would it work? if not, what's wrong with it? may it be upgraded? (I also thougth that i need only the positive part of the signal by the piezo and so I can delete the dual circuit part but trying it on LTspice it didn't work)

so, if you can, would you give me also a finished and improved circuit? thanks :)

I am also a civil engineer (steel structures), but I don't see what you try to accomplish. "A piezoelectric material generates electric charge in response to mechanical stress, but this charge doesn’t stay around forever. Rather, the material itself functions as a leakage path that causes the charge to gradually diminish." as nicely said in " All About Circuits".

And by experience, the generated pulse can be of a relatively rather large voltage all by itself, so I would protect the GPIO pin against excessive voltage (positive and negative). The MCU should be able to detect that voltage, an react within an event. So. at minimum, just the protection for the GPIO pin seems required. That is why what else you try to accomplish could be interesting to know.