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Homework Statement
Consider the circuit that attaches in the attachment. Calculate the Vout.
Homework Equations
Noninverting om amp:
Gain = Vout/Vin
= 1 + (Rf+Rs)
Golden Rules:
i = i+ =0
V = V+
The Attempt at a Solution
Gain = Vout/Vin
= 1 + (Rf+Rs)
= 1 + (10/20)
= 6
Vx = (5/4+5) Vin
= 5/9 Vin
Vin = 72mV
KCL:
(Vx  Vin /12K) + (Vx/9K) + (Vx Vout / 84k) = 0
Vx(1/12k + 1/9k + 1/84k) = (Vin/12k) + (Vout/84k)
[(5/9)(72*10^3)(1/12k + 1/9k + 1/84k)]  [(72*10^3)/12k] = (Vout/84k)
Vout = 0.189V
= 189.33 mV
I am interested to know how to find the value of Vx.
Besides, I would like to know is my final answer correct or not.
If not, please kindly point out my mistake.
Your help is very much appreciated
Thank you
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