Amplify small voltage signal

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hello

i have 1 troble. trying amplify small voltage signal strain gauge approx -0,50 mv 50 mv. need amplify 0-5v can sample on arduino bord.

i have connect 2 op-amp togeter (lm324n) , don´t right result. u recommend? ap-amp shuld use , how connect it?

well without knowing how you've put opamp circuit how can guess what's wrong.


since have strain guage best instrumentation-amplifier setup - available on single chip, there's standard way fabricate high-performance instrumentation-amplifier 3 op-amps too.  less performing solution single op-amp standard differential amplifier circuit.  of these you'll find on wikipedia these days, btw.

what accuracy looking btw, affects circuit design...

the lm324 work 5v single supply must keep signals in 0 3.5v range, , best keep them in 1.5 3.5v range.


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