User Guide

Chapter 8
Component Design Explained
through Examples
When developing circuits with EAGLE, components are fetched from
libraries and placed into the schematic or, if the Schematic Editor is not
being used, into the layout. All the component information is then
saved in the schematic or board file. The libraries are no longer needed
for continued work with the data. So when you want to pass your sche
-
matic to a third party to have a layout made from it, you do not also
have to supply the libraries. An alteration in a library has no effect on a
schematicorboard.
The most important procedures for the design of components (devices)
is explained starting from page 52. Some practical examples follow, from
which the effective application of the relevant commands and parame
-
terswillbeseen.
First we will take the example of a resistor and go through the whole
process of designing a simple component. The second example provides
a full description of the definition of a complex component, including
various package versions and technologies. After that we shall discuss
the special features which have to be taken into account with more com
-
plicatedcomponents.
First attempts at editing packages, symbols, or devices may result in the
need to delete various library elements. To do this, use the REMOVE
command.Forexample:
You would like to remove the package named DIL16. Switch to package
editingmode,and,atthecommandline,type:
REMOVEDIL16;
The package will be removed. Packages and symbols can be removed
only if they are not used in one of the library’s devices. In that case the
message Package is in use! or Symbol is in use! will appear. Remove the
correspondingdevicefirst.
137