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A three-input summing amplifier has input resistors with { R }_{ 1 } = { R }_{ 2 } = { R }_{ 3 } = 30 kΩ. To produce an averaging amplifier, what value of feedback resistor is needed?

Step-by-step

\mathrm{R}_{\mathrm{f}}=\frac{1}{3} \mathrm{R}_{1}=\underline{10 \mathrm{k} \Omega}

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