After laying out countless thousands of boards, I have posted a
preliminary checklist for PCB layout and schematic layout. They can be
found at:
http://www.pic101.com/pcb_checklist.htm
http://www.pic101.com/schematic_checklist.htm

Circuit board layout may or may not look anything like the schematic as
far as positioning of the components. Some of my boards look exactly
like the schematic and some have absolutely no resemblance of the
schematic. Laying out boards is almost an art. I have laid out the same
board at one time, five times and each one didn't look like the other.
The actual layout really depends on i/o positions, physical mounting
requirements, minimizing signal bleed, minimizing ground loops, and
current handling (if applicable).

Rick

> Try to lay out your SCH so it -somewhat- corresponds with that final
> layout. Meaning that from left to right (usually) 'this...' conects
with
> 'that...' conects with 'the other thing.' Of course the SCH -can't-
look
> exactly like the final assembly because it's a 'logical' layout rather

> than a physical layout, but that 'sensible' logical layout can help
make
> things easier later in the PCB, rework, debug, and troubleshooting
> stages.

>I disagree with this.  I don't see much advantage in the schematic
>reflecting the layout.  It is much more important that the schematic be

>readable and clearly convey the circuit to someone who isn't familiar
with
>it.  I start with the schematic, and have only a vague idea at best
when
>entering the schematic how the parts will be arranged on the board.

>
>Hey-
>
>Does anyone know of a good resource for learning "proper" PCB layout
>techniques?  I've got the Freeware version of Eagle Layout and
ExpressPCB..
>are there better tools for laying out boards?  Any direction would be
>appreciated.

Thanks

-R

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