Post by thread:[EE]: Eagle question. was: Anyone speak decouplin

Hello, Alexandre Guimarces wrote: > Take a look at http://www.dvanhorn.org/Micros/All/Bypass.php . David > wrote a nice and easy paga about it. Some of his tips may be questioned by > some, such as the thinner tracks from the main power track to the bypass > capacitor but many people think it is the best way. It should clear your > doubts. Someone knows how to make Eagle router use a thicker track at one point of the circuit and a thinner track at another, being the two tracks the same signal? Or things Like: Transformer============7805----------Digital stuffs | '-----------Analog circuits Thanks, Brusque ----------------------------------------------------------------- Edson Brusque C.I.Tronics Lighting Designers Ltda Research and Development Blumenau - SC - Brazil Say NO to HTML mail http://www.citronics.com.br ----------------------------------------------------------------- -- http://www.piclist.com hint: PICList Posts must start with ONE topic: [PIC]:,[SX]:,[AVR]: ->uP ONLY! [EE]:,[OT]: ->Other [BUY]:,[AD]: ->Ads

> Someone knows how to make Eagle router use a thicker track at one point > of the circuit and a thinner track at another, being the two tracks the same > signal? I don't think this is possible with the auto router. I think the only alternative is to manually route the track with all but one of the thicknesses, then the auto router can take over and route the rest of the net at a single thickness. ***************************************************************** Embed Inc, embedded system specialists in Littleton Massachusetts (978) 742-9014, http://www.embedinc.com -- http://www.piclist.com hint: PICList Posts must start with ONE topic: [PIC]:,[SX]:,[AVR]: ->uP ONLY! [EE]:,[OT]: ->Other [BUY]:,[AD]: ->Ads

> i think it's impossible > you have to do it in 2 steps > first (auto)route your finest track > then you can modify the thickness of the wanted tracks (click on change,width,choose width) That's not a good idea. You need to do the manual routing first. The autorouter may not leave room to widen a track after the fact. ***************************************************************** Embed Inc, embedded system specialists in Littleton Massachusetts (978) 742-9014, http://www.embedinc.com -- http://www.piclist.com hint: PICList Posts must start with ONE topic: [PIC]:,[SX]:,[AVR]: ->uP ONLY! [EE]:,[OT]: ->Other [BUY]:,[AD]: ->Ads

> That's not a good idea. You need to do the manual routing first. The > autorouter may not leave room to widen a track after the fact. > The other possibility is to autoroute, then ripup the track you want to change, and re-route it with the desired track thickness. --Brendan -- http://www.piclist.com hint: PICList Posts must start with ONE topic: [PIC]:,[SX]:,[AVR]: ->uP ONLY! [EE]:,[OT]: ->Other [BUY]:,[AD]: ->Ads

> The other possibility is to autoroute, then ripup the track you want to > change, and re-route it with the desired track thickness. True, but it will be a lot harder to manually route a track after lots of other tracks have already been routed. I'd rather have the computer do the hard figuring of how to get from here to there. Also, the wide tracks carrying the power are the one you usually care most about being straight. Again, you get this by manually routing the critical tracks first, then letting the autorouter do the rest. ***************************************************************** Embed Inc, embedded system specialists in Littleton Massachusetts (978) 742-9014, http://www.embedinc.com -- http://www.piclist.com hint: PICList Posts must start with ONE topic: [PIC]:,[SX]:,[AVR]: ->uP ONLY! [EE]:,[OT]: ->Other [BUY]:,[AD]: ->Ads

> Transformer============7805----------Digital stuffs > | > '-----------Analog circuits Use separate nets for Digital and analog. Only one of them containing the pad on 7805 output. The other net a pad very close to that one. After everything else is done, manually short those two pads or connect them somehow. On Ultiboard i managed to make a special connecting "double-pad" component consisting of two small pads without holes and no clearance, so the autorouter could route them individually, but still they were so close that the copper connected. /Morgan -- http://www.piclist.com hint: PICList Posts must start with ONE topic: [PIC]:,[SX]:,[AVR]: ->uP ONLY! [EE]:,[OT]: ->Other [BUY]:,[AD]: ->Ads

HA! Nothing is impossible. Here's how you get a fat track and a thin track in the same net using Eagle: Insert a device I will call a netmixer into your schematic. A netmixer has a package which is just two surface mount pads jammed up against each other and connected with a bit of line on a signal layer. On your schematic, connect the fat trace stuff to one side, and the thin trace stuff on the other side, and set up the two nets to have different trace widths. Viola! Autorouting of two different widths. Pay attention and make sure you visually check it after it is done. You may also find you get some DRC errors in the area because of close pads. I haven't had much trouble with netmixers, and I use them a lot! --Lawrence. ----- Original Message ----- From: "Jean-Marie ON7EN" <spam_OUTjean.marie.tjaeckxTakeThisOuTBELGACOM.BE> To: <.....PICLISTKILLspam@spam@MITVMA.MIT.EDU> Sent: Wednesday, June 26, 2002 8:46 AM Subject: Re: [EE]: Eagle question. was: Anyone speak decoupling/filter ca ps? > brusque > > i think it's impossible > you have to do it in 2 steps > first (auto)route your finest track > then you can modify the thickness of the wanted tracks (click on change,width,choose width) > > good luck > > jean-marie > on7en > > {Original Message removed}