Electronic Diagrams Chapter 18. 2 Technical Drawing 13 th Edition Giesecke, Mitchell, Spencer, Hill...

Electronic Diagrams

Chapter 18

2Technical Drawing 13th EditionGiesecke, Mitchell, Spencer, Hill Dygdon, Novak, Lockhart

© 2009 Pearson Education, Upper Saddle River, NJ 07458.

All Rights Reserved.

Objectives

• Identify common component symbols on an electronic schematic diagram

• Draw a schematic diagram using standardized symbols

• Draw connecting and crossover paths




Objectives (cont.)

• Identify interrupted and uninterrupted lines

• Designate terminals and numerical values of components




Types of Electronic Diagrams• The following are types of

diagrams defined in ANSI Y114.24-1999:• Functional block diagram• Single line diagram• Schematic diagram or circuit diagram• Connection or wiring diagram• Interconnection diagram




Functional Block Diagram




Single Line Diagram




Schematic Diagram




Connection Diagram




Standard Symbols

• Symbols should conform to an internationally or nationally approved standard

• Symbols should be drawn roughly 1.5 times the size of those shown in the IEEE 315A standard




Standard Symbols

• Switches and relays should be shown in the “normal” position with no operating force or applied energy




Abbreviations

• Abbreviations on electrical diagrams should conform to ANSI/ASME Y1.1




Grouping Parts

• Indicate grouped components using dashed lines to enclose them in a “box”




Arrangement of Symbols

• Arrange the various parts and symbols to balance blank areas and lines

• Provide sufficient blank spaces adjacent to symbols to allow for reference designations and notes




Signal Path

• Arrange schematic and single-line diagrams so that signal or transmission path from input to output proceeds from left to right and from top to bottom when possible




Connections and Crossovers• Connecting lines for conductors

are typically drawn horizontally or vertically to minimize bends and crossovers




Interrupted Paths

• Interrupted paths may be used to simplify a diagram




Terminals

• Terminal circles need not be shown unless they are needed for clarification




Color Coding

• Terminals or leads are frequently identified by colors or symbols which should be indicated on the diagram




Division of Parts

• For clarity, draw sections of multi-element parts separately in a schematic

• Indicate subdivisions with suffix letters




Electron Tube Pin Identification• Electron tubes are generally not

used in new designs but are still common in high-power amplifiers




Reference Designations

• It is essential to identify each separately replaceable part with appropriate combinations of letters and numbers

• Portions not separately replaceable are frequently identified




Numerical Values

• Along with reference designations, the following numerical values should also be shown:• Resistance• Capacitance• Inductance




Other Information

• The following information may also be included on schematic diagrams:• Functional identification• DC resistance of transformer windings

or coils• Critical input or output impedance

values• Voltage or current wave shapes at

selected points




Other Information (cont.)

• Wiring requirements for critical ground points, shielding, pairing, etc.

• Power or voltage ratings of parts• Identification of operational controls

or circuit functions




Integrated Circuits

• An integrated circuit is a semiconductor wafer or chip




Printed Circuits

• Printed circuit boards are widely used and replace hand-wiring methods




Computer Graphics

• CAD greatly simplifies the process of producing printed circuit artwork

• CAD component layout programs allow you to create the best possible parts placement

Electronic Diagrams Chapter 18. 2 Technical Drawing 13 th Edition Giesecke, Mitchell, Spencer, Hill...

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