# Summing Amplifier Practice

Practice question for ECE201: "Linear circuit analysis I"

By: Chinar Dhamija

Topic: Summing Op Amp

## Question

Find the output voltage, Vout.

First we know that $V_-$ = $V_+$
$V_-$ = 0V = $V_+$
The op amp can be ignored for this particular problem.
We can apply the formula we learned in class to solve for Vout.

$Vout = (\frac{-R_f}{R_1})Vin$
By using the superposition principle we can look at one voltage source at a time, then add them together to find Vout. \begin{align} Vout = (\frac{-72}{24})4 + (\frac{-72}{36})6\\ Vout = -24V \end{align}