印刷电路板PCB设计软件

软件概述

CadSoft Eagle 是很好用的一个设计印刷电路板（PCB）的软件，尽管软件不大，但是库非常多，并且封装做得很漂亮。PCB 的格式是 brd 文件，所以常常被人误认为是 Cadence Allegro 画出来的，其实不是。

What’s new in version 5.8？

Platforms
* The minimum system requirement for the Mac version of EAGLE is Mac OS X 10.4 (this was forgotton in the version 5.7.0 release notes).

License
* CadSoft now provides an EAGLE "Freemium" license, which is valid for a limited time, and is more powerful than the Freeware license. See http://www.element-14.com/eagle-freemium for more information.
* The Standard edition of EAGLE can now handle 6 signal layers.
* The "Help/EAGLE License…" option now allows the user to choose between using a customized license file, the Freeware or the Freemium license.

POLYGON command
* Added a note to the online help of the POLYGON command, recommending to leave the Isolate parameter at 0 to avoid problems during manufacturing.

PRINT command
* The PRINT command now always sets the default output file name to that of the currently loaded file when printing to a PDF or Postscript file.

SET command
* SET SNAP_LENGTH now accepts units.

TEXT command
* Added a note to the "Attributes" section of the online help for the TEXT command, saying that there should be only one placeholder text per attribute name in any given symbol or package.

Miscellaneous
* When a board is loaded, any leftover empty signals are now deleted automatically.
* The total thickness of the layer setup in the Design Rules is now displayed with the unit defined in SET Interface.PreferredUnit.

Bugfixes
* See the UPDATE file that comes with the installation archive for a list of fixes.

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