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'[EE]: Help manual track routing using Eagle'
2002\10\16@072606 by Steven Allard

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I am trying to manually route power and gnd tracks on a pcb produced
from a schematic using Eagle.

All is fine if I follow the airwire routing from one pin to the next,
but I want to change the sequence of the connections to better connect
decoupling capacitors. Is there a way of doing this ?

I've tried moving the tracks after following the route suggested by the
program, but it then puts airwires back in.

Any suggestions ?

Steve

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2002\10\16@085521 by Olin Lathrop

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> I am trying to manually route power and gnd tracks on a pcb produced
> from a schematic using Eagle.
>
> All is fine if I follow the airwire routing from one pin to the next,
> but I want to change the sequence of the connections to better connect
> decoupling capacitors. Is there a way of doing this ?
>
> I've tried moving the tracks after following the route suggested by the
> program, but it then puts airwires back in.

Right.  You delete any tracks you don't like, which reverts them to
airwires.  Then you manually route whatever connections you want.  If you've
connected them all, there will be no more airwires.  Once you've manually
routed the few that matter, just let the autorouter rip on the rest.  This
saves a *lot* of time.  I've been quite impressed by the autorouter in
Eagle, although you do have to take some time to understand how it works and
tweak it to what you want done.  Of course that should be expected for any
such complex tool.


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2002\10\16@105246 by Thomas H. Scarince

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> but I want to change the sequence of the connections

The airwires merely show you the "shortest distance" between connected pins.
Ignore them and route your connections however you want.  Then hit the
ratsnest button and the airwires will show you anything that you missed.

- Tom Scarince
http://www.thsengineering.com

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2002\10\16@113746 by William Chops Westfield

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   All is fine if I follow the airwire routing from one pin to the next,
   but I want to change the sequence of the connections to better connect
   decoupling capacitors. Is there a way of doing this ?

You don't HAVE to "follow the airwires" - when using the route
command/button, you can start at any airwire location, and route to any
point on the same network (click twice to terminate the route.)  Then you
can use the rats-nest button to recompure new airwires, and it will notice
that there's one less...  (actually, you don't even have to route to the
same network - you can stop in the middle of nowhere, which is occasionally
useful because the new endpoint (and verticies) become possible endpoints
for new "shortest airwires.")

Does that help?

BillW

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2002\10\17@035844 by Steven Allard

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Thank you to everyone who replied, I've just completed the pcb layout. My
mistake was not recalculating the ratsnest after manually routing a track.

This is my first experience with Eagle,  I'm still playing with the parameters
to see what happens, but I agree with Olin the autorouter is very impressive.

Regards

Steve

William Chops Westfield wrote:

{Quote hidden}

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