Posted February 2, 2012 by Chris

“We’ve all heard about the wonders of the PID controller, bringing a system’s output – temperature, velocity, light – to its desired set point quickly and accurately. But now, your boss says okay, design one for us. Although there’s a number of ways to do it, the circuit above nicely separates the three terms into three individual op amp circuits. We’ll build it in SPICE, test each term and finally place it inside a motor speed controller for you to tune.”