There are a couple instructables here on some of the finer points of Eagle (making your
own library parts: https://www.instructables.com/id/ERHQQ180Y3EP286NQY/
modifying the design rules: https://www.instructables.com/id/EZVIGHUBGCEP287BJB/ )
But feedback indicates that a lot of people could probably use an instructable on the
more basic aspects of creating a schematic and board.
This instructable covers creating a schematic, presumably from a printed schematic in
a magazine or image on the web. I'll start with schematic shown, which is from
It's got a "typical" collection of parts, and is vaguely useful as well.
Cadsoft EAGLE is available from http://www.cadsoftusa.com/
Cadsoft is a German company that is a veritable mecca of software distribution enlightenment. In addition to the reasonably-priced professional PCB design packages ($1200), they have freeware, lite, non-profit, and other intermediate licenses. Their software runs under windows, linux, and MacOSX. It's slightly quirky, with a steep (but not too high) learning curve on the front end, but from most reports it is not any more so than other professional CAD packages. They have online support forums that are active from both the company and other users, the package is under current development and gets better with each release. A number of PCB fabricators will accept their CAD files directly. It's good stuff.
Use it. Propagate it. Buy it when you "go pro."