R-2R Ladder DAC with Potential Divider

[Lord Grezington]

Hello

I am running short of time on a project so unfortunately I have not much time for testing, so I was hoping some of you could help...

I need to produce a number of different voltages from 0 - 1.8Vdc

I am a bit unsure with this project if I can put the potential divider circuit before or after the Opamp, I am a bit wary whether or not it is going to affect the R-2R Ladder.

Any Feedback would be appreciated - I cant use high cost components.

Thanks