Answer by Spehro Pefhany for Finding Feedback Resistance of Op Amp
I'll give you a hint here. You can calculate the Thevenin equivalent of the what is seen looking into R2. By inspection its source resistance is: \$R_T = R_2+(R_3||R_4)\$, and the open-circuit source...
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Finding Feedback Resistance of Op Amp
simulate this circuit – Schematic created using CircuitLab How would the feedback resistance be found in this setup? I am used to seeing the negative-feedback resistance as a single resistor between...
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