I keep re-watching Brian Douglas’s Control Systems in Practice MATLAB Tech Talks. They’re an unusually clear sustained treatment of practical control theory — the kind of thing a working engineer actually needs alongside a textbook — and after enough rewatches it became clear I wanted a single place where the ideas could sit side by side with figures I could push around.
This monograph is that place. Ten chapters. Each pairs a chapter of plain-language explanation with a live interactive figure, then links out to its source screencast in a companion section at the end.
What it covers
Chapters 1–2 — The bridge to reality. Feedforward control (when feedback alone isn’t fast enough) and why time delay turns easy control problems into difficult ones.
Chapters 3–4 — Working with delay and weird responses. The Padé approximant as the algebraic fix that lets transfer-function tools cope with delays, and the non-minimum-phase systems that make controllers go the wrong way before they go the right way.
Chapters 5–6 — When linear is not enough. Gain scheduling for plants that change with operating point, and the step response as the single most informative experiment a working engineer ever runs.
Chapter 7 — The three diagrams. Nichols, Nyquist, and Bode as three views of the same loop — why each one earns its keep and when to reach for which.
Chapter 8 — Notch filters, but understood. Reframing the notch as a band-stop seen inside-out, and why that perspective matters when you’re tuning around mechanical resonances.
Chapters 9–10 — The deep theory that pays off. The gang of six transfer functions you actually have to look at to know if a loop is robust, and passivity as the final stability guarantee that survives nonlinearity, uncertainty, and time-variation.
Each chapter has a live figure you can interact with, a short list of where the idea shows up, and notes from the field. The whole monograph takes roughly twenty minutes to read.
Read it
The monograph lives at its own URL with its own visual identity — a darker paper, an EB Garamond body, a small set of dedicated accent colors. It’s intentionally designed as a standalone artifact, so this post is mostly a pointer. Hit the button above and enjoy.
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