With default schematic as above, it is -
Rf = R27, R29 = 10K
Rg = R28, R30 = 8.2K
output = input x A, gain
gain, A = (1 + Rf/Rg) where Rf = 10K and Rg = 8.2K
= 1 + 10/8.2
= 1 + 1.21
= 2.21
output = input x 2.21 times
with swap Rf = 8.2K and Rg = 10K
Gain A = 1 + (8.2/10)
= 1 + 0.82
=...