Re: Low cost PCB layout software

From: Ralph Malph (noone_at_yahoo.com)
Date: 12/30/03 

Date: Tue, 30 Dec 2003 01:30:44 -0500

Rich Webb wrote:
>
> On Sun, 28 Dec 2003 08:54:42 -0500, Ralph Malph <noone@yahoo.com> wrote:
>
> >Help me with this. I downloaded the MD5sum program and the checksum is
> >not ok, then what do I try to fix? I have done the same downloads
> >several times from this website and they just don't seem to work. Other
> >sites download just fine and the programs run.
> >
> >I use a download utility called Star Downloader 1.42 and have never had
> >any trouble with it before. I repeated the download and got a different
> >wrong checksum.
>
> Try a simple FTP from ftp://ftp.cadsoft.de/pub/program/4.11/. If you
> don't have an FTP client, there's one available from
> http://sourceforge.net/projects/filezilla

I got the file to download correctly by telling the download utility to
download it in one stream rather than in several. I am not sure how
multiple streams helps, perhaps improving speed when the source limits
bandwidth to any one stream.

But now that I have tried to use Eagle, I do not find it an easy to use
tool. One of the first tasks I have is to make a foot print for a
TSSOP20 package. I can find various commands to add the SMD pads, but
it is *extremely* tedious since I have to calculate the X,Y of every pad
and then go though a process of creating each one and moving it to the
right location using the mouse. Since the X,Y coordinate shown depends
on where the pad is picked up using the mouse, I have to use the info
command to find the current location, make sure I pick it up by that
location and then move it to the correct location. I tired using typed
commands for this, but the editor complains saying the move command can
only be used on "boards".

I can't seem to find a way to pour copper on this part, which it needs
to create a large pad under the body for heat conduction. I suppose I
could add an extra pin to the schematic and use the SMD command, but
that seems like an odd way to do it.

All in all, this seems like yet another program that is very far from
modern GUI techniques. I have drawn this layout in Visio to make sure
it will fit on the board and it was much, much easier to do than it is
in the board layout package.

I have looked at the tutorial and did not find it very enlightening.
Anyone know of other sources of info on how to use this tool? The
manuals just don't cut it.

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