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Old 10th August 2004, 08:04 PM   #11
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That may be so, but there is a LOT of software that maintains and indicates the connectivity if you go from schematic daigram to layout. I'm using Proteus, but there are many others: I draw the schematic, and then 'transfer' to the PCB part of the program with one click.
If I defined the packages in the schematic diagram (which is more or less automatic as most devices have a package connected to it), the pcb program lists all the components in a list, and I can pick them and place them. While moving the component, I have a real-time display of the connections to other components (called the ratsnest) and also a vector telling me which direction to move to keep all connections minimum length. I tell you, it is a GREAT help, because for one thing, it makes it sure that the connectivity is EXACTLY as on the schematic diagram: no wiring errors!
So, yes, placing ultimately is your job, but your not left out in the cold.

In fact, it's even better, because it also has a sim, so I sim, and then if I finalise the schema, and that is exactly as it was simulated, transferred to the pcb. Best thing since sliced bread!

Jan Didden
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Old 10th August 2004, 08:45 PM   #12
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Location: Austin, TX
Default thnx

very very thnx Mr Fraser ..
i 'll try as u say ..
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Old 10th August 2004, 10:15 PM   #13
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Join Date: Dec 2003
Location: Orange County, CA
Default Ratsnest

Yes, I do use the ratsnest feature to maintain conections. However, I have yet to find a package that that will place to components on the board worth a darn. You see, his problem was not the one of drawing a board layout, of which there are many programs or of routing it, which we do much faster because of the rats nest but that he wanted the program to place the components as well.

This person wanted a freeware program that would do this function as he was unable to figure out how to do this. I told him to stop looking because even the best of packages don't place worth anything you can use. And when you have shoved everything around by hand, on your screen to your satisfaction, even the routers do not do a great job. Yes I use an auto router to do the grunt work to find paths but I find I still have to adjust every single trace to get everything to fit and to route the traces the auto router gives up on or where the routing rules prevent there from being an automated solution.

I told him to use paper puppets like we did in the 70s.
Dan Fraser
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