So the new equation for V1 is:V1=\frac{-Vo}{Rf/R1}+V2

[sgillon]

Hi, I was wondering how you would re-arrange the differential mode equation :
Vo=(V2-V1)*(Rf/R1)
to have V1 as the subject of the formula - its been annoying me for ages.

thanks

 

[KingNothing]

Well...first of all, divide by Rf/R1
$$\frac{Vo}{Rf/R1}=V2-V1$$ THen we just subtract V2 and multiply by -1:
$$\frac{Vo}{Rf/R1}-V2=-V1$$
$$V1=\frac{-Vo}{Rf/R1}+V2$$