Adding parts to schematic not on the boar d

Am 17.03.2011 14:05, schrieb Dave:

The board I'm working on drives a transistor (and other stuff)that is not

on the circuit board but I need to show it in the schematic so I know what

it is and so I have complete documentation of the circuit. I have the

outputs from the board going to through holes and I want the board to end

there. I want to add the other stuff to the schematic but not have it show

up on the board.

  How do I do this? I presume there is another schematic layer to put this

stuff on so it doesn't show on the board?

From scratch, EAGLE cannot do this. Using one of my ULPs, you can place

whatever 'real' parts you want on the sheet (including their board

counterparts) and afterwards convert these things into pure graphics on

the sheet (which deletes their board counterparts again). See my post

'Rein graphische Symbole im Schaltplan zeichnen' from 2010-10-22 in the

newsgroup 'eagle.support.ger'. Depending on your EAGLE installation, the

ULP dialog should display texts in German or English. Hopefully it works

for you.

Andreas Weidner

I managed to find the message thread but unfortunatly I can't read German

so I can't pick out the ULP name. As much as I'd like to read the dialog

about it, perhaps you can just give me the name of the ULP and I'll search

for it in the ULP library.

Did I miss something here?

BTW, thanks for creating it. I'm surprised Eagle can't do this by putting

the parts on a special layer or something. This makes it difficult to

properly document a circuit which has parts off the board.

Perhaps something to add in future releases.

Sage

--

Web access to CadSoft support forums at www.eaglecentral.ca.  Where the CadSoft EAGLE community meets.

I managed to find the message thread but unfortunatly I can't read German

so I can't pick out the ULP name. As much as I'd like to read the dialog

about it, perhaps you can just give me the name of the ULP and I'll search

for it in the ULP library.

Did I miss something here?

BTW, thanks for creating it. I'm surprised Eagle can't do this by putting

the parts on a special layer or something. This makes it difficult to

properly document a circuit which has parts off the board.

Perhaps something to add in future releases.

Sage

--

Web access to CadSoft support forums at www.eaglecentral.ca.  Where the CadSoft EAGLE community meets.

On 3/17/2011 1:13 PM, Dave wrote:

Ok. So far I've only made a few parts myself so I'm not really familiar

with making parts with chosen net names (I don't think).  So I guess what

your saying is you create a part like a transistor that has no outline -

just pads? SO when it gets placed on the board all you see is pads not an

outline. Normally when you place a part you see it's ouline on the board

and need to allow space for it. Without an outline I guess I would just see

pads and I could place this right in the middle of a board if I wanted? -

no space required other than for the pads?

 

I might need and example to study.

 

I'll have to think about this a bit but I think I see what your getting

at.

 

It may also be beneficial to have the other suggested method of converting

sections of the schematic to a picture (so to speak) so I can put larger

connection diagrams etc. More than what I'd want to put create into a

"part".

 

Thanks

 

Sage

Yes, you've got it, the footprint is not the package footprint, just a

set of holes for wires. This works pretty good if you have a single

offboard component, except you can't rearrange the holes on the board

and you need to make a "custom package". It gets a little more awkward

when the offboard components connect to each other on the panel. A lot

of this could go away if hierarchical drawings were part of EAGLE, but...

I support the addition of an EAGLE native method to deal with off board

components, such as a special layer or null package.

Ok. So far I've only made a few parts myself so I'm not really familiar

with making parts with chosen net names (I don't think).  So I guess what

your saying is you create a part like a transistor that has no outline -

just pads? SO when it gets placed on the board all you see is pads not an

outline. Normally when you place a part you see it's ouline on the board

and need to allow space for it. Without an outline I guess I would just see

pads and I could place this right in the middle of a board if I wanted? -

no space required other than for the pads?

I might need and example to study.

I'll have to think about this a bit but I think I see what your getting

at.

It may also be beneficial to have the other suggested method of converting

sections of the schematic to a picture (so to speak) so I can put larger

connection diagrams etc. More than what I'd want to put create into a

"part".

Thanks

Sage

--

Web access to CadSoft support forums at www.eaglecentral.ca.  Where the CadSoft EAGLE community meets.

On 03/17/2011 02:57 PM, Dave wrote:

Maybe I'm not understanding what your getting at but I don't see how your

suggestion solves the problem of NOT having the parts show up on the board

(I just want them in the schematic).

Let me give you the example:

  I have an ignition system circuit and circuit board. Off the board is the

power driver IGBT, the coil and some connections to the battery and

sparkplug. I want to include that stuff in the schematic because it has the

part number for the transistor, winding info for the coil and the

connections of them to the circuit, the battery and spark plug. This

information is important for documentation purposes but is not part of the

circuit board layout to be created.

  I like to have all the circuit documentation in one place not have to

piece it together from a bunch of sheets.

 

Andreas' solution seems to be the way to go.

 

Sage

Your off board part is an on board part connected by wires to your board.

Make a off board IGBT part. It has 3 pad for the layout. The IGBT and

info shows on the sch. On the layout only three plated holes which can

be assigned net names so they connect to the correct place in the circuit.

When you place your IGBT on the sch and connect it to the next you will

have 3 pads that have the correct net names/

The IGBT symbol you make or modify would have a dashed line around it to

signify off board.

Off topic.

Years ago I developed a high power CDI ignition.  1 uf at 600V with a

1/2 cycle sent via a scr to the standard spark coil.

It made engines run very good at very lean mixtures but we had issues

with the spark plugs breaking down at 0.075" or larger plug gap.

Paul R.

Maybe I'm not understanding what your getting at but I don't see how your

suggestion solves the problem of NOT having the parts show up on the board

(I just want them in the schematic).

Let me give you the example:

I have an ignition system circuit and circuit board. Off the board is the

power driver IGBT, the coil and some connections to the battery and

sparkplug. I want to include that stuff in the schematic because it has the

part number for the transistor, winding info for the coil and the

connections of them to the circuit, the battery and spark plug. This

information is important for documentation purposes but is not part of the

circuit board layout to be created.

I like to have all the circuit documentation in one place not have to

piece it together from a bunch of sheets.

Andreas' solution seems to be the way to go.

Sage

--

Web access to CadSoft support forums at www.eaglecentral.ca.  Where the CadSoft EAGLE community meets.

On 03/17/2011 02:09 PM, Dave wrote:

I managed to find the message thread but unfortunatly I can't read German

so I can't pick out the ULP name. As much as I'd like to read the dialog

about it, perhaps you can just give me the name of the ULP and I'll search

for it in the ULP library.

Did I miss something here?

  BTW, thanks for creating it. I'm surprised Eagle can't do this by putting

the parts on a special layer or something. This makes it difficult to

properly document a circuit which has parts off the board.

Perhaps something to add in future releases.

 

Sage

 

If you are connecting the off board parts by wires why not make a device

which has the schematic symbol you need and has the pads for the wires

with correct silkscreen info. One problem with this is if you use random

locations to place your wire pads you would have to modify the pad

locations in the lib.

Paul R.