Doing Layout on two outer layers in OrCAD

V

Vitaliy

Guest
I have to place the components on the top and on the bottom of the
board to save space.
I could not find in OrCAD manuals the information on how to do it.


PS. I also have +5V, -5V and gnd - I don't want them to be inner
layers.


Thanks,
Vitaliy
 
Vitaliy wrote:
I have to place the components on the top and on the bottom of the
board to save space.
I could not find in OrCAD manuals the information on how to do it.


PS. I also have +5V, -5V and gnd - I don't want them to be inner
layers.


Thanks,
Vitaliy
Click to expand...
Although I am not currently using OrCad layout, one would assume there
is a 'mirror' command somewhere. If you mirror a component, it (by
definition) should get placed on the opposite side of the board.

Cheers

PeteS
 
Yes, I found the solution - select a part and then change the layer to
bottom (or press 't' to toggle)
 
A straight mirror can be dangerous. Protel 99SE has a mirror and change
layer commands.

The Mirror is handy if you want to mount a chip upside down. Why you ask?
I once did a demo board for a remote control. All the SMD component were
mounted upside down with holes cut into the PCB so that the height
restrictions were met. I believe the final version was going to be
chip-on-board with thick film discrete.

Simon

"PeteS" <ps@fleetwoodmobile.com> wrote in message
news:1137747432.891133.168200@g47g2000cwa.googlegroups.com...
Vitaliy wrote:
I have to place the components on the top and on the bottom of the
board to save space.
I could not find in OrCAD manuals the information on how to do it.


PS. I also have +5V, -5V and gnd - I don't want them to be inner
layers.


Thanks,
Vitaliy

Although I am not currently using OrCad layout, one would assume there
is a 'mirror' command somewhere. If you mirror a component, it (by
definition) should get placed on the opposite side of the board.

Cheers

PeteS
Click to expand...
 
Simon Peacock wrote:

All the SMD component were
mounted upside down with holes cut into the PCB so that the height
restrictions were met.
Click to expand...
Did you manage to make split through- plated holes for the resistors,
caps etc? Can this be made by PCB manufacturers?
 
I must use OrCAD, so not much choice there. I was given a board and
asked to repeat what's on the board as close as possible. Why is
straight mirror dangerous and what's a better solution?

Vitaliy
 
"Vitaliy" <vmykhayl@ee.ryerson.ca> wrote in message
news:1138083783.323043.252450@g49g2000cwa.googlegroups.com...
Why is
straight mirror dangerous and what's a better solution?
Click to expand...
It's much more likely someone will be able to prove your counterfeit board
really does infringe directly on someone else's design? :) Whereas if you at
least shove a few components and traces around you might argue both the boards
were manufacturer's references designs maybe? :)
 
Well, it's part of research project and the previous board was done in
the different software for the same supervisor, so I should be safe:)
 
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