gEDA-user: Autorouter, Groundplane, SMD components

[George M. Gallant, Jr.]

Stefan,

I just received 5 different double sided boards with a combination of
SMD and
thru-hole devices. Schematic with GSCHEM and layout with PCB.

For jumpers I create a third layer.  You then use via's to get to this
dummy
layer and trace to simulate the jumper. Just don't send the board shop
that layer.

George

On Wed, 2006-08-09 at 19:08 +0200, Stefan Salewski wrote:

> 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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