Table of Contents 0. Introduction Why this is a free, interactive electronics book. 0.1 Introduction 0.2 Schematics & Simulations Tutorial 1. Conceptual Foundations of Engineering Powerful systems-level problem solving tools for electronics and beyond. 1.1 Algebraic Approximations 1.2 Orders of Magnitude, Logarithmic Scales, and Decibels 1.3 Complex Numbers 1.4 Linear & Nonlinear 1.5 Systems of Eq