Understanding symbols, nets, and connections before you start designing Introduction So you want to design a PCB. Or maybe you just need to understand an existing circuit. Either way, you need to read a schematic . A schematic is the blueprint of your circuit. It shows every component, every connection, and how everything fits together — without worrying about physical placement or board shape. If you’ve never seen one before, it can look like a mess of random symbols and lines. This guide will teach you how to read one. The Basics: What Every Schematic Shows Every schematic has three fundamental things: - Components (symbols representing resistors, chips, connectors, etc.) - Nets (lines representing electrical connections) - Reference designators (labels like R1, C2, U3) Once you can identify these three things, you can understand any schematic. Reading Component Symbols Different components have different symbols.…