Problema 43-3.    Fonte:   Problem created by the site's authors.

In the circuit shown in Figure 43-03.1, determine values ​​for  R₁ , R₂ and R₃ so that the amplifier presents a gain equal to 10 V.

Solution of the Problem 43-3

Based on what was studied in the theoretical part, we know that the amplifier gain is given by:

This way, to achieve a gain equal to 10, let's do R₁ = 10 kΩ  and  R₂ = 1 kΩ

On the other hand, we know that the value R₃ is given by:

Therefore, if V_i = 1 V and the cursor of P_aj is at ground, the voltage of output will be - 10 V. If the cursor is positioned at the top of P_aj, then the circuit will behave like a non-inverting amplifier and its output will be equal to + 10 V.