School Project

Question

Design an op amp circuit to perform the following operation: vo = 3.5v1 - 2.5v2. All resistances must be <= 100k. The power supply should be +15V and -15V. Let v1 = 2V and v2 = 1V. 
 I need help designing an op amp on LTSpice for a school project that counts as my class final exam. I've been stuck on this and would greatly appreciate any help

MTF_Walker · Accepted Answer

You will find this useful: https://www.analog.com/en/resources/analog-dialogue/articles/deeper-look-into-difference-amplifiers.html 
 When you click Place Component, LTspice has Example circuits for each op-amp, so you don't need to start from scratch: 
 
 All you need to do is modify the topology, gain resistor values and input voltages to match your assignment. 
 Best of luck!)

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