Re: gEDA-user: Breaking up power planes
On Mon, Feb 21, 2011 at 12:40 AM, Stephan Boettcher wrote: > Russell Dill writes: > >> On Sun, Feb 20, 2011 at 10:05 AM, Kai-Martin Knaak wrote: >>> Russell Dill wrote: >>> I'm just wondering what everyones preferred method of breaking up power/ground planes is. >>> >>> My preferred method is to break the planes as little as possible :-) >>> IMHO, a continuous copper plane is the best you can get for shielding >>> purposes. If large amounts current need to be canalized, I prefer to >>> guide them in fat tracks rather than polygons. With tracks it is easier >>> to ensure a minimum diameter. >>> >> >> My design has several different power and IO rails, and so it requires >> split power planes.I realize its possible to do with the polygon >> editor, it just seems like it'd be much easier with the line drawing >> tool. > > You want to split a polygon into different nets? Does that work? Even > if you invoke the special magic to not loose isolated parts of the > polygon, will the connectivity check treat them as separate copper and > assign them to different nets? > > I've drawn separate polys for each power/gnd net on my boards. > > Let's see, ok, it does work. I'd still be uncomfortable with such a > layout. > I haven't had the chance to test it yet, but I just found the magic command that completes the cycle: --- MorphPolygon(Object|Selected) Converts dead polygon islands into separate polygons. If a polygon is divided into unconnected "islands", you can use this command to convert the otherwise disappeared islands into separate polygons. Be sure the cursor is over a portion of the polygon that remains visible. Very small islands that may flake off are automatically deleted. --- So draw a polygon pour that fills the board, then draw traces that clear the desired amount of spacing to split up the planes. Perform a :MorphPolygon(Object), and then delete the traces. Of course, editing is still a bit of an issue. ___ geda-user mailing list geda-user@moria.seul.org http://www.seul.org/cgi-bin/mailman/listinfo/geda-user
Re: gEDA-user: Breaking up power planes
On Sat, 19 Feb 2011 13:18:39 -0500 DJ Delorie wrote: > I've been thinking we need a "polygon editing hints mode" :-) Similar to the "check polygon" mode. Yeah.. that would be great! :-) I think it would be great if in "thin draw poly" mode, the polygon clearance were switched off. Just an idea. Levente -- Kovacs Levente Voice: +36705071002 ___ geda-user mailing list geda-user@moria.seul.org http://www.seul.org/cgi-bin/mailman/listinfo/geda-user
Re: gEDA-user: Breaking up power planes
Russell Dill writes: > On Sun, Feb 20, 2011 at 10:05 AM, Kai-Martin Knaak wrote: >> Russell Dill wrote: >> >>> I'm just wondering what everyones preferred method of breaking up >>> power/ground planes is. >> >> My preferred method is to break the planes as little as possible :-) >> IMHO, a continuous copper plane is the best you can get for shielding >> purposes. If large amounts current need to be canalized, I prefer to >> guide them in fat tracks rather than polygons. With tracks it is easier >> to ensure a minimum diameter. >> > > My design has several different power and IO rails, and so it requires > split power planes.I realize its possible to do with the polygon > editor, it just seems like it'd be much easier with the line drawing > tool. You want to split a polygon into different nets? Does that work? Even if you invoke the special magic to not loose isolated parts of the polygon, will the connectivity check treat them as separate copper and assign them to different nets? I've drawn separate polys for each power/gnd net on my boards. Let's see, ok, it does work. I'd still be uncomfortable with such a layout. test.pcb Description: Binary data -- Stephan ___ geda-user mailing list geda-user@moria.seul.org http://www.seul.org/cgi-bin/mailman/listinfo/geda-user
Re: gEDA-user: Breaking up power planes
On Sun, Feb 20, 2011 at 10:05 AM, Kai-Martin Knaak wrote: > Russell Dill wrote: > >> I'm just wondering what everyones preferred method of breaking up >> power/ground planes is. > > My preferred method is to break the planes as little as possible :-) > IMHO, a continuous copper plane is the best you can get for shielding > purposes. If large amounts current need to be canalized, I prefer to > guide them in fat tracks rather than polygons. With tracks it is easier > to ensure a minimum diameter. > My design has several different power and IO rails, and so it requires split power planes.I realize its possible to do with the polygon editor, it just seems like it'd be much easier with the line drawing tool. ___ geda-user mailing list geda-user@moria.seul.org http://www.seul.org/cgi-bin/mailman/listinfo/geda-user
Re: gEDA-user: Breaking up power planes
Russell Dill wrote: > I'm just wondering what everyones preferred method of breaking up > power/ground planes is. My preferred method is to break the planes as little as possible :-) IMHO, a continuous copper plane is the best you can get for shielding purposes. If large amounts current need to be canalized, I prefer to guide them in fat tracks rather than polygons. With tracks it is easier to ensure a minimum diameter. ---<)kaimartin(>--- -- Kai-Martin Knaak Email: k...@familieknaak.de Öffentlicher PGP-Schlüssel: http://pool.sks-keyservers.net:11371/pks/lookup?search=0x6C0B9F53 ___ geda-user mailing list geda-user@moria.seul.org http://www.seul.org/cgi-bin/mailman/listinfo/geda-user
Re: gEDA-user: Breaking up power planes
I've had good luck, for the size boards i've been doing, with imposing strict on-grid (0.005") disciple for drawing polygons. This alleviated what at first seemed to be inaccurate selection on the part of the tools (PCB) but was in fact inaccurate design. P. Taylor Signature On Feb 19, 2011, at 10:18 AM, DJ Delorie wrote: > >> You mean moving the vertex of a polygon? And waht are you doing when it is >> hidden by a clearance? > > I disable vias and pads, and just guess at where the vertex is. > > I've been thinking we need a "polygon editing hints mode" :-) > > > ___ > geda-user mailing list > geda-user@moria.seul.org > http://www.seul.org/cgi-bin/mailman/listinfo/geda-user ___ geda-user mailing list geda-user@moria.seul.org http://www.seul.org/cgi-bin/mailman/listinfo/geda-user
Re: gEDA-user: Breaking up power planes
> You mean moving the vertex of a polygon? And waht are you doing when it is > hidden by a clearance? I disable vias and pads, and just guess at where the vertex is. I've been thinking we need a "polygon editing hints mode" :-) ___ geda-user mailing list geda-user@moria.seul.org http://www.seul.org/cgi-bin/mailman/listinfo/geda-user
Re: gEDA-user: Breaking up power planes
On Sat, 19 Feb 2011 12:37:53 -0500 DJ Delorie wrote: > I use the polygon editor. With the new Holes tool, it's a lot easier. You mean moving the vertex of a polygon? And waht are you doing when it is hidden by a clearance? Thanks, Levente -- Levente Kovacs http://levente.logonex.eu ___ geda-user mailing list geda-user@moria.seul.org http://www.seul.org/cgi-bin/mailman/listinfo/geda-user
Re: gEDA-user: Breaking up power planes
I use the polygon editor. With the new Holes tool, it's a lot easier. ___ geda-user mailing list geda-user@moria.seul.org http://www.seul.org/cgi-bin/mailman/listinfo/geda-user
gEDA-user: Breaking up power planes
I'm just wondering what everyones preferred method of breaking up power/ground planes is. Way back when I used to break them up by using the polygon editor which was really a pain. It seems like using a 0 width trace might work well, but it produces a zero width line on the gerber, bummer. ___ geda-user mailing list geda-user@moria.seul.org http://www.seul.org/cgi-bin/mailman/listinfo/geda-user
