gEDA-user: Autorouter, Groundplane, SMD components

[Stefan Salewski <mail@xxxxxxxxxxxx>]

Hello,

I have created a schematic with gschem and converted it to a pcb 
file using gsch2pcb. Now I try to do the layout.

I will do a two sided layout, bottom side should be a ground 
plane with no components and only a few signal traces. On top 
side I have SMD parts and a few conventional parts which needs 
holes in pcb board.

Has anybody done such layout successfully with pcb  (PCB version 
20060422)?

For testing I have created a very small board with an OPAMP with 
DIP footprint, two resistors in SMD (1206 footprint), two 
capacitors  in SMD (1206 footprint) and some headers for signal 
and power.

Without a ground plane, autorouting works. But with ground plane 
I was not able to get a correct layout. Autorouter is generating 
shortened nets, Optimizer removes necessary vias...
And I was not able to fix these errors manually.

Unfortunately there is no tutorial for this process. I have found 
some advice in this mailing list and gEDA wiki, but it will not 
work for me. 

Additional question: In a complicated layout it may be impossible 
to layout all traces, so one has to use short isolated copper 
wires (Drahtbruecken) or SMD-resistors with zero ohm resistance 
to make some connections. How can I do this?

Best regards

Stefan Salewski 


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