Hey all I'm having a couple of problems designing a summing amplifier, and hoping you can help me out.
So i am trying to design a summing amplifier as found below
My requirements are:
- when my R3 (potentiometer) is adjusted from one end of its travel ot the other, the Vo should be 4.0V p-p sinewave that has a DC offset, that varies from 5.0 to 10.0 volts
I'm having a hard time calculating the values of R1,R2 and Rf, these are the formulas I have but I just can't get the values right...
Here are my given formulas
For 5VDC 1/3 = Rf/Ri+1000 and Rf/Ri = 4
for 10VDC 2/3 = Rf/R2
I am not quite sure what to do with these values. I havesolved for Rf and Ri so that
Rf = 3500
R1 = 875
R2 = 5200
Are those correct according to the calculations?
So i am trying to design a summing amplifier as found below
My requirements are:
- when my R3 (potentiometer) is adjusted from one end of its travel ot the other, the Vo should be 4.0V p-p sinewave that has a DC offset, that varies from 5.0 to 10.0 volts
I'm having a hard time calculating the values of R1,R2 and Rf, these are the formulas I have but I just can't get the values right...
Here are my given formulas
For 5VDC 1/3 = Rf/Ri+1000 and Rf/Ri = 4
for 10VDC 2/3 = Rf/R2
I am not quite sure what to do with these values. I havesolved for Rf and Ri so that
Rf = 3500
R1 = 875
R2 = 5200
Are those correct according to the calculations?