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Schematics are symbolic representations of the data and components that will be used in an electronic circuit. Schematics are used for sales, service, manufacturing and engineering staff  to be able to understand how the circuitry functions.

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Electronic schematics are required to completely describe how the wiring will be connected to the components. The Cad Technician will develop the wiring list from the schematic.

The wire list will contain the basic information from the schematic and additional information including: Color of wire, Gage of wire, Length of wire, Entry in parts list, Condition at terminals

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Used to show engineering, manufacturing and service personnel the wiring between and across components

The point to point diagram will contain all of the information necessary to make or follow all components

This wiring diagram may be included on the assembly drawing

Will show the wiring paths on a background of components

Will show the general physical arrangement of the component parts

Not necessarily to scale

Wires will be shown on equal spacing, as this is easier for the reader to follow

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The CAD Technician should be provided with a sketch depicting the schematic. The more experienced the CAD technician is the less formal the sketch will be. The CAD technician will use their knowledge of symbols and basic principles of schematics to lay out the schematic

Schematic Rules and Guidelines

1.Schematic must be organized and laid out in a way that will fit the necessary drawing size

2. Appropriate symbols and specifications must be provided for all components

3.Provide necessary notes and legends

4.Normal signal flow will be from left to right and top to bottom

5.Lines should be a minimum of a quarter of an inch apart

6.Lettering should be an eighth of an inch high

7.Lines between components should always take the shortest path

8.Connecting lines should have a minimum of crossovers and jogs

9.Long parallel line should be arranged in groups of three

10.Lines may be given emphasis to help the reader follow the signal

11.Avoid four way points or four way functions

12.Power sources should go on top

13.Ground lines placed on the bottom

14.Lines will run vertically or horizontally with changes in direction limited to 90 degree jogs

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Block diagrams are a method of explaining complex systems in a simple manner. They are made up of blocks joined by arrows. Arrows symbolize direction of flow as well as inputs and outputs.

Block Diagram Rules and Guidelines
1.Blocks within a diagram should be the same size within the diagram

2.The block containing the most information will determine the size of blocks used

3.Inputs to the block must enter at the top or left side of the block

4.Outputs must exit from the bottom or right side of the block

5.All lines should either be vertical or horizontal and any changes in direction should be 90 degrees

6.Lines that run parallel to each pother should be spaced larger every third line

7.Lines should never cross whenever possible

8.Minimize jogged lines when possible

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A flow chart is defines as a pictorial representation describing a process and can even be used to plan stages of a process. Flow charts will provide people with a common language or reference point when dealing with a project or process

Flow Chart Example

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1. In a drawing a proper flow chart all necessary requirements should be listed in logical order

2. The flowchart should be clear, neat and easy to follow, there shouldn’t be any room ambiguity

3. T left to right or top to bottom

4. Only one line should come out of a process symbol

5. Make sure the flow chart has a start and finish

6. Test the flowchart

7.  Make the width of all symbols the same

8.  Keep lettering size and orientation the same throughout the drawing

9.  Define the boundaries of the process clearly

10. Use the simplest symbols possible