Sorry to say but they don't look all that much different... Could be me of course,
Andy On Thu, 16 Apr 2009 12:18:51 -0000 "Jos" <[email protected]> wrote: > > I have uploaded a modified board, HP-403 PSU.pdf to the files section. > > Have a look at this. > I had to edit all modules and enlarge the pads. > > How does this look to you? > > Jos > > --- In [email protected], Andy Eskelson <andyya...@...> wrote: > > > > > > I have just measured the output of a unit. > > > > I used a previous PCB I had designed that used a TO220 device. > > > > That used both round and square pads. From module editor the pad sizes > > were 0.07" for both the square and round. > > > > I printed this as a postscript file to the printer, (I use a OKI C5400) > > > > I then scanned the area around the TO220 at 1200dpi using the flatbed. > > > > Counting the pixels I get 86 pixels across both the square and round > > pads. That works out at 0.0716" which is bang on correct as far as the > > measurement method goes. > > > > So in the postscript output the pad sizes are correct as stated in the > > module editor. > > > > I agree that the pads do LOOK a bit thin and small, but that's how they > > are designed. If you can do the same sort of measurment you could find > > out if your output is really wrong. > > > > > > Andy > > > > > > > > > > On Wed, 15 Apr 2009 19:27:58 -0000 > > "Jos" <jos.ra...@...> wrote: > > > > > > > > You are right Andy, > > > I find the dimensions for the track also to be a little thin. > > > > > > The print is mate for true scale to a PDF printer in the printer setup > > > from Win XP. > > > > > > Here at home I print directly to a laserjet 5si, also in true scale. > > > I mirror the copper, as you might have noticed, for printing on > > > transparent. Then the toner makes direct contact with the copper of the > > > PCB and light will not spill over. > > > > > > But everything is a bit undersized. > > > I used to work with Ultiboard some 10 years back. > > > > > > Jos PA0AMX > > > > > > --- In [email protected], Andy Eskelson <andyyahoo@> wrote: > > > > > > > > The pads look fairly normal to me but... > > > > > > > > How did you print them out, be careful about this as there are several > > > > printing options. There are options for a rough print, useful for > > > > checking, but the dimensions will not be exact. There is an exact print > > > > option which you would use for photo resist films. Under the print > > > > options. > > > > > > > > There are other options to print under the plot menu either the full > > > > size > > > > drill or just a drilling mark. > > > > > > > > For things like the one pin connector which I think you have used, I > > > > find > > > > that the defined drill size leaves far too little copper, so I always > > > > change that. I also plot to postscript for the main output and set the > > > > drill to just be a point rather than full size as for home workshop use > > > > that provides a nice centre point for the drill bit to follow. > > > > > > > > I don't get the effect you see here, so perhaps it's a display/grid size > > > > thing. > > > > > > > > As a general observation I would be inclined to beef up the track widths > > > > you are using. You will find that they are very thin, and in my opinion > > > > a > > > > bit too thin for a 1A regulator. > > > > > > > > Andy > > > > > > > > > > > > > > > ------------------------------------ > > > > > > Please read the Kicad FAQ in the group files section before posting your > > > question. > > > Please post your bug reports here. They will be picked up by the creator > > > of Kicad. > > > Please visit http://www.kicadlib.org for details of how to contribute > > > your symbols/modules to the kicad library. > > > For building Kicad from source and other development questions visit the > > > kicad-devel group at http://groups.yahoo.com/group/kicad-develYahoo! > > > Groups Links > > > > > > > > > > > > > > > > ------------------------------------ > > Please read the Kicad FAQ in the group files section before posting your > question. > Please post your bug reports here. They will be picked up by the creator of > Kicad. > Please visit http://www.kicadlib.org for details of how to contribute your > symbols/modules to the kicad library. > For building Kicad from source and other development questions visit the > kicad-devel group at http://groups.yahoo.com/group/kicad-develYahoo! Groups > Links > > >
