Free circuit board layout tool PCB 3.0
PCB version 3.0 printed circuit board layout tool
pcb is free software for designing printed circuit board layouts. It has many features and is capable of professional-quality output. It is available for UN*X operating systems, e.g., GNU/Linux, Mac OS-X, or Cygwin under Windows. pcb was orignally written by Thomas Nau of the University of Ulm, Germany, and is now maintained by harry eaton of the Johns Hopkins University Applied Physics Laboratory, Laurel, Maryland, USA.
PCB 3.0 is a branch of the source code modified to operate under the Tcl/Tk interpreter. Most of the coding for PCB 3.0 was done at MultiGiG, Inc., Scotts Valley, California, by Tim Edwards, Paramesh Santanam, and (working from India, courtesy of SynApps, Inc.), Nishit Patel. The code base is a departure from the original PCB in that a complete Tcl command-line API was concocted for PCB, and the GUI re-written as a Tk script. For the first cut (version 3.0), a fair bit of effort went to ensuring that the GUI looks and acts as much like the original Xlib-based version.
Features
Multi-Layer: Up to 8 layers plus silkscreen
Parts Libraries:
TTL 74xx
connectors
crystals
linear series
voltage regulators
resistors: discrete and arrayed
capacitors
transistors
PALs
LEDs
RAM ICs
easy to generate user-defined parts
Output formats:
PostScript
Color for design checking
B/W for mask generation
Gerber (RS-274X)
Output layers:
up to 8 routing layers
component mask
solder mask
silkscreen(s)
drill file(s)
solder paste
Design Rule Checking (DRC)
Complex ground/power planes
Show electrical connectivity
Netlist comparison
Drill report
Scripting with Tcl/Tk