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Electronics Forum / CAD / January 2006Doing Layout on two outer layers in OrCAD
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 > I have to place the components on the top and on the bottom of the > board to save space. [quoted text clipped - 5 lines] > 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 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 > > I have to place the components on the top and on the bottom of the > > board to save space. [quoted text clipped - 13 lines] > > PeteS > All the SMD component were > mounted upside down with holes cut into the PCB so that the height > restrictions were met. 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 > Why is > straight mirror dangerous and what's a better solution? 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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