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Data acquisition System Design

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Thanks for reply.

Find the attached file.

When the op-amps are changed to FET type input, the circuit does not work.
 

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  • DiffAmp.rar
    2.9 KB · Views: 34

Hi,

can you show us your TINA results without the need to install TINA?
* Screenshot?
* PDF?

Klaus
 

You must not use a floating source to drive the differential amplifier, need to bias it inside the common mode range. Some OPs might float to a mid voltage by chance, at least in a simulation, don't expect this for a real world amplifier.
 

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