Question

The gain of 7 is required from a non-inverting amplifier circuit. If the input resistor is 5kΩ, determine the value of the feedback resistor?

A. 5kΩ
B. 30kΩ
C. 15kΩ
D. 7.5kΩ

Answer 1

The value of the feedback resistor in the non-inverting amplifier circuit is 30kΩ.

Step-by-step explanation:

To determine the value of the feedback resistor in a non-inverting amplifier circuit, we can use the formula:

Gain = 1 + (Rf / Ri)

Where Gain is the desired gain and Ri is the input resistor. Rearranging the formula to solve for Rf, we get:

Rf = (Gain - 1) * Ri

Plugging in the given values, with Gain = 7 and Ri = 5kΩ, we can calculate:

Rf = (7 - 1) * 5kΩ = 30kΩ

So, the value of the feedback resistor is 30kΩ.