Eagle Cad questions

B

Bill Stock

Guest
I drew a simple schematic with Eagle light and I was wondering how to
designate "off board" items, such as transformers/rheostats that I want to
show in the schematic, but won't be on the board itself?

Secondly, I was having a little trouble finding some basic components, which
I attribute to my lack of knowledge of the part terminology. One example was
the rheostats above and the other was a basic snap in electrolytic capacitor
(AWF-M20)? I know not all of the parts will be there, but I must be missing
something here?
 
how to designate "off board" items ?
Bill Stock

The logical way to do it is to make a new library device (.DEV)
Click to expand...
where the package (.PAC) has only pads and a label.


having a little trouble finding...snap in electrolytic capacitor

The CadSoft site has a wealth of information
Click to expand...
(including 2 newsgroups where you can find
very specific knowledge about EAGLE-related things).
Lurking on those groups will be worthwhile.

Maybe somebody has created these library elements
and uploaded the .LBR there.

Perhaps the manufacturer has them for download.
Google the site with the search term *LBR*.
 
how to designate "off board" items ?
Bill Stock
Click to expand...
In my 1st post, I missed what you were saying .

To show (on the schematic) that a part is not located on the PCB,
show the edge of the board as a heavy dashed line
with the on-board parts on 1 side of the line
and the chassis-mount / panel-mount parts on the other.
 
To show (on the schematic) that a part is not located on the PCB,
show the edge of the board as a heavy dashed line
with the on-board parts on 1 side of the line
and the chassis-mount / panel-mount parts on the other.
JeffM

If one does as you say, he will get a bunch of parts in his netlist
that don't exist on the PC board.
That is why the hierarchical schematic was created.
Chuck Harris
Click to expand...
In the real world, yes.
He sounds like a newbie hobbyist to me.
Mine is a workable solution for his needs.
Lots of Tektronix manuals (et al) look as I describe.
 
Bill Stock wrote:

A newbie! LOL.

Yes, I haven't done much of this stuff in 20 years. Even then, I taped up
the few boards I etched. I preferred wirewrap or Vero.

I could have taped up 3 boards with the time I've spent on Eagle. But I
thought it would be a good learning experience. I think I'll be looking for
something else though, the funky interface is one thing, but the bugs are
another. I've got identical circuits in the schematic that have different
signal paths in the layout editor. No amount of dicking around has fixed
this.

Thanks for the help Jeff/Chuck.
Click to expand...
Hi Bill,

One thing that often causes problems like you are describing is placing
a wire with the wire overlapping the pin. This (depending on the program)
isn't always obvious from just looking at the screen, or a print of the screen.
However, there should be an Electronic Rules Checker (ERC) program that
finds problems like this.

Best of luck,

-Chuck
 
how to designate "off board" items...that I want to show in the
schematic
Bill Stock

i just put a text label and pads, then i place the pads on the pcb.
jim dorey
Click to expand...
You repeated the mistake I made by not reading the OP carefully,
posted the same (mistaken) answer I did,
and didn't read all of the thread to notice it was about SCHEMATICS.
A trifecta!
 
how to designate "off board" items...that I want to show in the
schematic
Bill Stock

i just put a text label and pads, then i place the pads on the pcb.
jim dorey
Click to expand...
You repeated the mistake I made by not reading the OP carefully,
posted the same (mistaken) answer I did,
and didn't read all of the thread to notice it was about SCHEMATICS.
A trifecta!
 
how to designate "off board" items...that I want to show in the
schematic
Bill Stock

i just put a text label and pads, then i place the pads on the pcb.
jim dorey
Click to expand...
You repeated the mistake I made by not reading the OP carefully,
posted the same (mistaken) answer I did,
and didn't read all of the thread to notice it was about SCHEMATICS.
A trifecta!
 
"JeffM" <jeffm_@email.com> wrote in message
news:1107298679.153204.224360@z14g2000cwz.googlegroups.com...
how to designate "off board" items...that I want to show in the
schematic
Bill Stock

i just put a text label and pads, then i place the pads on the pcb.
jim dorey

You repeated the mistake I made by not reading the OP carefully,
posted the same (mistaken) answer I did,
and didn't read all of the thread to notice it was about SCHEMATICS.
A trifecta!
Click to expand...

Ahhh -- one more time Jeff, what was that again ??
 
one more time Jeff
Mike Fields
Click to expand...
With Google server errors and their lousy error messages,
I managed to get my own trifecta. :cool:

I'd also forgotten the lower latency
--which now allows you to check. 8-(
 
"JeffM" <jeffm_@email.com> wrote in message
news:1107319040.365725.288640@l41g2000cwc.googlegroups.com...
one more time Jeff
Mike Fields

With Google server errors and their lousy error messages,
I managed to get my own trifecta. :cool:

I'd also forgotten the lower latency
--which now allows you to check. 8-(
Click to expand...
Ain't technology wonderful ?? ;-)
 
On Sat, 29 Jan 2005 12:46:59 -0500, "Bill Stock" <Me7@Privacy.net>
wrote:

I drew a simple schematic with Eagle light and I was wondering how to
designate "off board" items, such as transformers/rheostats that I want to
show in the schematic, but won't be on the board itself?

Secondly, I was having a little trouble finding some basic components, which
I attribute to my lack of knowledge of the part terminology. One example was
the rheostats above and the other was a basic snap in electrolytic capacitor
(AWF-M20)? I know not all of the parts will be there, but I must be missing
something here?
Click to expand...
I use Protel, rather than Eagle.

For off-board parts, I show them on the schematic as usual, but give
them a "footprint" (PC pad pattern) that is convenient - not
necessarily related to the off-board component's shape.

I don't know the extent of Eagle's library, but I rarely make a board
in Protel without making a new schematic component or PCB footprint
(and I've been using Protel for years!) With Protel, it is often much
easier to make a new part (schematic or PCB) than to search through
the libraries to see if what I want already exists.


--
Peter Bennett, VE7CEI
peterbb4 (at) interchange.ubc.ca
new newsgroup users info : http://vancouver-webpages.com/nnq
GPS and NMEA info: http://vancouver-webpages.com/peter
Vancouver Power Squadron: http://vancouver.powersquadron.ca
 
JeffM wrote:
how to designate "off board" items ?
Bill Stock


In my 1st post, I missed what you were saying .

To show (on the schematic) that a part is not located on the PCB,
show the edge of the board as a heavy dashed line
with the on-board parts on 1 side of the line
and the chassis-mount / panel-mount parts on the other.
Click to expand...
There is more to a schematic these days, than just being pretty and
readable. There is a need for a schematic to represent 1-to-1 what
is on a PCB. If one does as you say, he will get a bunch of parts
in his netlist that don't exist on the PC board.

That is why the hierarchical schematic was created. On the top level,
you include the things that are wired to the PCB, and the PCB shown
as a block part. When you descend into that block, you get the
schematic of what is on the PCB.

-Chuck
 
JeffM wrote:
To show (on the schematic) that a part is not located on the PCB,
show the edge of the board as a heavy dashed line
with the on-board parts on 1 side of the line
and the chassis-mount / panel-mount parts on the other.
JeffM

If one does as you say, he will get a bunch of parts in his netlist
that don't exist on the PC board.
That is why the hierarchical schematic was created.
Chuck Harris


In the real world, yes.
He sounds like a newbie hobbyist to me.
Mine is a workable solution for his needs.
Lots of Tektronix manuals (et al) look as I describe.
Click to expand...
Of course, and Tektronix maintained a large herd of
draftsmen for the longest time to draw up those schematics
and layout those PC boards by hand.

It doesn't relate well to modern cad tools... even those available
to "newbie hobbyists"

-Chuck
 
"JeffM" <jeffm_@email.com> wrote in message
news:1107110722.332996.219960@c13g2000cwb.googlegroups.com...
To show (on the schematic) that a part is not located on the PCB,
show the edge of the board as a heavy dashed line
with the on-board parts on 1 side of the line
and the chassis-mount / panel-mount parts on the other.
JeffM

If one does as you say, he will get a bunch of parts in his netlist
that don't exist on the PC board.
That is why the hierarchical schematic was created.
Chuck Harris

In the real world, yes.
He sounds like a newbie hobbyist to me.
Mine is a workable solution for his needs.
Lots of Tektronix manuals (et al) look as I describe.
Click to expand...
A newbie! LOL.

Yes, I haven't done much of this stuff in 20 years. Even then, I taped up
the few boards I etched. I preferred wirewrap or Vero.

I could have taped up 3 boards with the time I've spent on Eagle. But I
thought it would be a good learning experience. I think I'll be looking for
something else though, the funky interface is one thing, but the bugs are
another. I've got identical circuits in the schematic that have different
signal paths in the layout editor. No amount of dicking around has fixed
this.

Thanks for the help Jeff/Chuck.
 
On Sat, 29 Jan 2005 12:46:59 -0500, Bill Stock <Me7@Privacy.net> wrote:

I drew a simple schematic with Eagle light and I was wondering how to
designate "off board" items, such as transformers/rheostats that I want
to
show in the schematic, but won't be on the board itself?

Secondly, I was having a little trouble finding some basic components,
which
I attribute to my lack of knowledge of the part terminology. One example
was
the rheostats above and the other was a basic snap in electrolytic
capacitor
(AWF-M20)? I know not all of the parts will be there, but I must be
missing
something here?
Click to expand...
i just put a text label and pads, then i place the pads on the pcb.

--
Using Opera's revolutionary e-mail client: http://www.opera.com/m2/
 
On 1 Feb 2005 15:01:05 -0800, JeffM <jeffm_@email.com> wrote:

how to designate "off board" items...that I want to show in the
schematic
Bill Stock

i just put a text label and pads, then i place the pads on the pcb.
jim dorey

You repeated the mistake I made by not reading the OP carefully,
posted the same (mistaken) answer I did,
and didn't read all of the thread to notice it was about SCHEMATICS.
A trifecta!
Click to expand...
no, i put labels on the schematic, with orphan pins sometimes, often i'll
put in something from the con-ptr500 library(which keep the pins together
nicely, or some pin headers.

--
Using Opera's revolutionary e-mail client: http://www.opera.com/m2/
 
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