Hi,

I want to take the difference in voltage using an op amp and just take that difference without amplifying it as my output,

would I have to just use the same values for R1 and R2 or can I leave some resistors out?

Thanks in advance

 

Here is the relevant section in our Ebook - http://www.allaboutcircuits.com/vol_3/chpt_8/9.html.