Noobish question - how do I exclude components from a PCB?

So here's the problem. I have a power supply schematic I need to
create a PCB for. My CAD is ye olde OrCAD 9.2. The power supply
includes a rather substantial transformer, and the primary of that
transformer is connected to the mains through a fuse and a switch,
both of which are in the schematic. None of this stuff will be mounted
on the PCB.

The question is, how do I exclude the plug, switch and the fuse from
the schematic.

 

Don't put them there.

 

That's an obvious workaround. What if I do want to put them there.
They contain valuable information after all - grounding, rating of the
fuse, DPDT-ness of the switch, wire colors of the transformer's
windings. Can't I use the same schematic for PCB and assembly?

 

It just occured to me that I probably wasn't clear enough on what I
want to accomplish. I don't want to exclude them from the schematic
per se. Just from the PCB. In other words, I'm trying to find a way to
mark some of the components as "don't even bother placing pads for
these".

 

Put them in a separate schematic?

Leon

 

This problem occurs all the time with any CAD tool. You need to create
your symbol in such a way that it is only a schematic symbol and it
doesn't "forward" to the PCB, but still shows up on the BOM.
I don't know how to do this in OrCAD. The problem in reverse is test
pads, they show up on the schematic, thus are a "part", but are not
purchased, they are pads on the PCB, so they aren't on the BOM.
Maybe if you look around the documentation for test points, it will
show you the properties you need to play with.

 

The question is, how do I exclude the plug, switch and the fuse from

Create new PCB componment shapes that will appear as patterns of holes
on your PCB. Link these shapes to the schematic symbols.

You will need to place through-hole pads for these, as otherwise it will
not be easy to run the wires from those parts to the PCB.

 

I'd forgotten this, but the Pulsonix software I use lets me create
schematic only parts. These may be added to a schematic and won't
appear on the PCB. They actually appear on the parts list, which is
useful.

You might be able to do something similar.

Leon

 

Just use Tango to make the PCB layout, and you can place things however
you like... ALL by hand. A power supply isn't so complicated that you
would even need checking routines at all.

 

I don't understand. Why not create a schematic without the parts you
don't want.
Then create the PCB from that schematic.. and if all goes well add to
the original schematic
the parts that are not going to go on the pcb.

shortT

 

Use a separate schematic for the wiring harness.

Graham

 

You're quite MAD.

Graham

 

NOOOOOOO !

Draw as it as several schematics that actually physically represent the way
you build the product.

Jeez !

Graham