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[DPRG] Eagle Schematic/Board mess....
Subject: [DPRG] Eagle Schematic/Board mess....
From: Triffid Hunter
triffid_hunter at funkmunch.net
Date: Wed May 21 20:31:25 CDT 2008
On Wed, 21 May 2008, Ben Clapp wrote:
> In order to design my first board, I decided to use Eagle... I started
> out with the schematic. Everything turned out great, as far I as I could
> see... But when I imported the parts for board design, I noticed that
> the GNDs and VCC's were connected in all sorts of strange places. For
> GND that doesn't matter, but the way VCC is connected right now (in one
> giant series, causing too much voltage drain), I can't run anything..
> It's a mess now... Could somebody fix up my Eagle schematic/board files
> and teach me how to not completely mess up my circuitry next time? :P
> Thanks a ton. Also, if there's anything else strange about my circuit,
> please tell me, keeping in mind this is my first design; I don't have as
> much experience in electric circuitry as I'd like. :P
Route power traces by hand first, then let the autorouter do the rest. If
the autorouter makes a big mess, you need to move some parts around, maybe
pinswap and gateswap too. Click ripup, then go to rip up the whole board
and rearrange your parts.
Use the polygon tool for ground planes. You'll have to name it after
laying it down with the name tool by clicking on one of its edges. The
autorouter handles planes intelligently as long as they're named
appropriately first. The 'orphans' setting controls whether or not the
plane creates islands (I usually turn it off), and the 'isolate' setting
controls how far the plane keeps itself from tracks and vias and pins and
things.
For single layer boards, I like to leave the top layer enabled but set a
very high cost for using it in the autorouter settings. This way, it'll
only go over the top if it absolutely must or if the alternative is
running a trace around the outside of the whole board. When actually
making the board, the top traces are implemented as wire links.
If you mirror a part, it will be put on the other side of the board.
Useful for double layer designs, and surface mounting parts in single
layer designs.
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