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Best way of measuring current with shunt

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nctnico:
IMHO most of your problems go away if you power the opamp from the 9V to 16V supply. With the usual bypassing you shouldn't have to worry about noise from the supply. If the opamp's input can go to the supply rails you can construct a simple substracting amplifier.

Twistx77:
Well, at the end I'll be using a MAX4372 which is not that expensive here, is 1,39€ which is not that bad for a real current amplifier.

Thank you to all of you!

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