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Help whit gain calculation

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jony130

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Can anyone show me, how to calculate the gain of this amplifier
 

Hi,
The gain can be calculated as follows:

-Vi(R2/R1) + Vo*k(1+R2/R1) = Vo

where
R2/R1 = 2k/1k = 2 and k = (R4||R5) / [R3 + (R4||R5)] = 0.312 approx.

So, -2Vi + 3*0.312Vo = Vo
Vo(1-0.936) = -2Vi
Gain Vo/Vi = -2/0.064 = - 31.25

Regards,
Laktronics
 

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    jony130

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