EEC 111 electrical drawing Lecture note pdf download
List of contents
Week 1
1. Introduction of Electronic Drawing
1.1 Introduction
1.2 Rules for drawing schematics
1.3 Connections and crossovers
1.4 Planning a schematic circuit diagrams
Week 2 …………..……………………………………………………….. 6
2. Computer Aided Drawing using Microsoft Visio
2.1 Visio 2003 Basics
2.2 Starting Visio Technical
2.3 Page Setup Dialog Box
2.4 Size and Position Window
2.5 Saving a Drawing
2.6 Formatting Toolbar
2.7 Standard Tool bar
2.8 The stencil
Drawing No. 1
Week 3 …………..……………………
EEC 111 electrical drawing Lecture note pdf download
Week 1
1.0 Introduction
Almost all projects, especially engineering projects, include mechanical, electrical,
and Electronic components. Electronic components consist of items like power supply,
energy conversion units, control circuitry …etc.
Thus, knowledge of electronic systems is important for every drafter. Our purpose
here is to show the rules for electronic drawing schematics.
Drafters are responsible for preparing drawings that are easy to read. The drawing
should completely describe the engineer’s design requirements. Drawing will allow the
reader only one interpretation. Decisions cannot be left to the reader.
The engineer’s sketches and layouts are called detail drawing and the drafter’s
drawing is called the technical drawing.
1.2 Rules for drawing schematics
1. Normal signal flow should be from left to right and top to bottom.
2. Lines should be spaced a minimum of 5 mm apart.
3. Lettering should be 4 mm high.
4. Lines between components should track the shortest path.
5. Connecting lines should have a minimum of crossovers and joggles.
6. Long parallel lines should be arranged in groups.
7. Power sources should go up and ground lines down.
8. All lines should run horizontally or vertically and connect in 90 corners.
9. The symbols may be drawn to any size or default size (drawing by computer) but on
the diagram similar symbols are drawn of the same size.
10. Almost all symbols may be rotated or mirror-reversed without alteration of the
meaning.
11. Individual similar components in a circuit should be arranged either vertically or
horizontally.
1.3 Connections and crossovers
Two systems are approved for showing connections (junctions) or crossovers. One is
the dot system, as shown in Fig. (1.2a)(1.2b)(1.2c). The other is the no-dot system shown in
Fig. (1.2d)(1.2e). The no-dot system of Fig. (1.2e) has some weaknesses in terms of clarity,
but it has equality in the standards.
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