1. The problem statement, all variables and given/known data In a system to regulate speed, a speed gauge is connected to the following circuit [Broken] What's the purpose of this circuit? What's the difference between Uout and U*out? 3. The attempt at a solution I assume that the purpose of this circuit is to help prevent overload, since it's a voltage follower. The difference between U*out and Uout...well, one just goes to earth and the other one to an unknown source. Is that what they mean?