***Sorry for my poor English language***
this circuit use for eliminate dc offset
In this exsample I've set 2V offset in 5Vpp ac signal (in the real world the offset voltage is just a few millivolt )
R 500 ohm assume to source impedance
R 3K5 to balance offset
C 200nF connected in negative feedback to block DC current that set the OpAmp to sink DC offset from input
R 800 ohm to pulldown capacitor current
R 10K assume to load
hope you enjoy ; )
