Self Test on Tutorial 8B

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The circuit diagram shows a non-inverting amplifier.

(a) Explain why this circuit uses negative feedback.

(b) Calculate the voltage gain if Ra = 33 k and Rf = 270 k.

(c) A 100 k resistor is placed in series with the non-inverting input. Explain what difference, if any, will be made to the gain of the amplifier.

(d) With reference to the input resistance and phase, explain the advantage of using a non-inverting amplifier to an inverting amplifier.

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