PCB Design and Fabrication Tutorial PAWS（PCB设计和制造教程爪子）.pdf

PCB Design and Fabrication Quick Start Guide This tutorial describes the processes involved in producing a single layer PCB. Note: Any Eagle CAD instructions listed within the tutorial are executable using tool bar script box by entering the name of the command icon and pressing enter. Creating a Board From a Schematic 1. Create a schematic using Eagle Schematic. 2. Click on the “Board” icon when the schematic is complete. This opens up Layout Editor and creates a board file with the same name as that of the schematic. Page 1 of 21 Creating a Board Layout In the screen shot below, the circuit components and “ratsnest” are on the left side of the window. Eagle uses the term, airwires, to describe the rubber band-like connections between components. The black frame represents the board outlines. Create the circuit design within the board area using the Move and Rotate commands. To display component names: 1. select ViewDisplay/hide layers….or click on the Display command icon 2. click on layer 25 (tNames). Page 2 of 21 The screen shot below displays the desired circuit layout within the board area. To calculate the shortest possible component airwire connections: • select ToolsRatsnest or click on the Ratsnest command icon Design Rules Design Rules specify all parameters relative to board fabrication. To access Design Rules: 1. Select Tools Drc (Design rule check) or click on the Drc command icon. 2. Select the Clearance tab. a. Set Wire and Pad clearance to 20mil. This value refers to the minimum distance between copper traces, solder pads, or any vias (holes) in the board. Page 3 of 21 3. Select the Distance