Philosophy of automatic control; open loop, sensitivity, components of a control loop; closed loop control, error analysis. Design of P, I, PI, and PID-controllers based on closed-loop specifications. Stability criteria: Routh-Hurwitz. Lead/lag controller design using Root Locus and Bode diagrams. Sensor frequency response to classical inputs. Application of electronics and sensors to control systems based on frequency response. Basic digital analysis including digitization, sampling, aliasing, A/D and D/A devices, and phase loss due to time delays.