Ken YoussefiUC Berkeley 1 Electrical Drawings

Ken YoussefiUC Berkeley 2 Types of Electronic Diagrams Schematic Diagrams Using graphic symbols, shows the electrical connections and functions of a specified circuit arrangement. Wiring Diagrams Represents the actual wiring between component devices in electrical equipment. Shows internal or external connections, or both. Wiring Harness Diagram Logic Diagrams Shows logic gates and components. Printed Circuit Board Drawing (PCB) PC boards replace hand-wiring manufacturing methods.

Ken YoussefiUC Berkeley 3 Schematic Drawings

Ken YoussefiUC Berkeley 4 Wiring Diagrams Point-to-Point diagram Wire color codes 0. Black (BK) 1.Brown (BN) 2.Red (RD) 3.Orange (OR) 4.Yellow (YL) 5.Green (GN) 6.Blue (BL) 7.Violet (VI) 8.Gray (GY) 9.White (WH) Each wire is shown by a separate line.

Ken YoussefiUC Berkeley 5 Wiring Diagrams Baseline diagram Wire lines from components are terminated into common baselines.

Ken YoussefiUC Berkeley 6 Wiring Diagrams Highway diagram The feeder lines from component terminals are merged into a single highway.

Ken YoussefiUC Berkeley 7 Wiring Diagrams Wiring harnessCabling diagram

Ken YoussefiUC Berkeley 8 Logic Diagrams Logic Gates Logic circuits are used for controlling electronic devices.

Ken YoussefiUC Berkeley 9 Printed Circuit Board Drawings (PCBs) Schematic Drawing Provides the basis of a circuit board. Logic diagram is used for integrated circuits. Artwork Drawing – Component side Artwork drawings are used to create the mask that will actually create the etched circuit. The component side artwork shows the circuitry that will be etched on the same side as the circuit components.

Ken YoussefiUC Berkeley 10 Printed Circuit Board Drawings (PCBs) Artwork Drawing – Circuit side The side where most of the circuit connections are made

Ken YoussefiUC Berkeley 11 Printed Circuit Board Drawings (PCBs) Fabrication Drawing Used to cut the board edges and to locate the feed-through holes for drilling.

Ken YoussefiUC Berkeley 12 Printed Circuit Board Drawings (PCBs) Silkscreen Drawing Lettering and component outlines are printed on the board. Assembly Drawing Shows how components are mounted before being soldered, and it is used by manufacturing to ensure proper assembly of the components.

Ken YoussefiUC Berkeley 13 Printed Circuit Board Drawings (PCBs)

Ken YoussefiUC Berkeley 14 Sources of Standardized Codes and Symbols ANSI - American National Standards Institute - Graphic Symbols for Electrical and Electronic Diagrams - ANSI / IEEE Government standard for military contractors MIL - STD – 275 Printed Wiring for Electronic Equipment MIL - STD – 429Printed Wiring and Printed Circuits – Terms and Definitions MIL - STD – 454Standard General Requirements for Electronic Equipment MIL - STD – 681Identification Coding and Application of Hook Up and Lead Wire MIL - STD – 1495Multi-layer Printed Wiring Boards for Electronic Equipment Underwriters’ Laboratory (UL) - Safety codes & consideration