Eagle CAD is a Professional PCB
design package from the German company CadSoft. It offers an array of licenses,
some of which allow individuals to use the package virtually free of charge.
The learning curve may be a bit steep, but then Computer Aided Drafting is
hardly simple, and most CAD packages have steep learning curves.
Linux and OS X, ensuring complete compatibility. There is an online forum,
which has an active support from the user members as well as CadSoft itself..
locate components in the official libraries. Although the libraries are
extensive, they are somewhat old-fashioned and the nomenclature is more suited
to the component packages (with leads) as compared to the more common lead-less
SMD packages often distributed these days.
have to use the ADD dialog. This is available when you click the ADD button in
the GUI menu. You must be careful of the DROP button in the ADD dialog. This is
not a button to drop the part into the schematic. It actually 'drops' the
particular library from the available libraries. If you have disabled a library
in this way, you can re-enable it at startup by expanding the Library and
clicking the dot beside the disabled library.
dialog, the part attaches itself to your mouse pointer, and you can place it at
the desired location on the drawing page, when you click the left mouse button.
When you click the right mouse button, the part rotates 90 degrees. Pressing
the middle button mirrors the part, which is also useful at times.
capacitors pose the biggest challenge to a newcomer to Eagle. Resistors are
classified in the library in two different ways as the R-US (the zigzag line
type, mostly used in the US), and as the R-EU style (the rectangle type, mostly
used in Europe). The package options are as WWLL/SS. Here, WW represents the
body width, LL represents the body length, and SS represents the hole spacing.
The numbers are all truncated millimeters. Thus, R-US_0207/10 means a resistor
with 2.54mm diameter, 7.62mm length and 10.16mm hole spacing. For vertically
mounted resistors, the designation will become R-US_0207/10V.
complex than selecting a resistor.
This is mostly because capacitors come in a wider variety and have different
shapes. The two major forms are still the C-EU and the C-US in the library. The
standard package nomenclature for designating a capacitor follows SSS-WWWXLLL,
where SSS represents the lead spacing, WWW represents the body width, and LLL
represents the body length.
are classified in the library as CPOL-EU or CPOL-US, and the package
nomenclature follows TSSS-DD, with T representing the type (TT for tantalum and
E for electrolytic), DD representing the diameter (mainly for radial types) and
SSS again representing the lead spacing.