Where electronics enthusiasts find answers.
rpcelectronics wrote:Are you limited to having all parts on the same side of the board? If not, consider placing any non crucial, low profile parts on the opposite side. This would be mostly resistors and caps. This can sometime reduce your number of vias. I'm not suprised by the numbers though. I have had larger board with that many parts with a high number of vias. I use Eagle as well and personally, I like the autorouter. Some people think its a real pig, but it really does a decent job for me.I was just supprized that one of the traces changed board sides 4 times before reaching the destination on the same side! I have is set up as if i were doing a mostly through hole board, Horizontal runs on one side, Vertical on the other. maybe i should try again with that off and just let it do its own thing.
Chupa wrote:im trying to design a fairly small board (<2.5in sq) with eagle, not many components(~20), but their most all SMD. When i use the auto router to do the traces i end up with something like 80 vias, which seems like way too much for this small simple board.Greetings chupa,
rr_pilot wrote:The eagle autorouter really isn't all that bad, you just need to know how to use it. First thing I do is start by giving the router as many choices as possible.Yeah, I really agree with just about everything you said. The autorouter has a lot to think about as it lays traces, rips them up and looks for a better route (although some don't belive that it does this )
1) Change the routing direction to '*'
2) Change the routing grid to something appropriete, I have found after many trial and error a routing grid of 0.1 mm with traces from 8mil - 12mil.
For some reason eagles router seems to be alot slower then other routers i've used but with 0.1 mm grid then its not to big of a deal anyways.
I've played around alot with changing the settings in the optimization passes with little change in the overall result. The most effective way of reducing vias in eagle is selecting a appropriete routing grid and the placement of your parts.
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