eaglepcbschematics
In the past I designed a PCB on EAGLE, and now I want to make some changes on it, but it's impossible. You can see it in the picture below:
In the old schematic part I can move and delete nets, but I can't stick a new line or new elements to an old design part. It looks as if my schematic is separated into the old design and the new design, and I can't connect these two together.
"Invoke" command resolves this.
I've got only Eagle 5.11.0 in front of me at the moment. But, this haven't changed in 6.3.0
@ScottSeidman had beat me to the answer, while I was annotating the screenshot.
The only way you can really "test" circuits in Eagle is by using the ERC tool (Electronics Rules Check) which checks for shorts, misplaced connections, etc. You can find it at the bottom of the left-hand toolbar. What you really want is a simulator though, something like Multisim or LTSpice. I can't guarantee that either of those programs contain all the components you'll need though, so you'll have to mess around with it a bit.
I am seeing quite a few issues with the schematic so far, but the ERC tool should point them out to you.
Best Answer
This means that the schematic was designed with a different grid setting that the new one. Even if the grid size was the same it is possible that the origin has moved (if say you selected all and moved the group with the alt grid).
With a schematic, unlike the PCB, really everything should be on a strict grid, it is only Text Labels that should be allowed to be placed off grid (and even then I would still stick to the grid!).
For single wires you can
ctrl+clickon the end point of the wire to pull it back to the current grid. You can do the same with the origin points of components. However this only works if a very small number of bits are off grid. For a large schematic it would take a very long time to individually re-grid every component.Fortunately, there is a quick solution to restore the entire schematic if it has ended up off-grid. In the schematic window, enter the following command:
run snap-on-grid-schWhat this will do is set the origin of every component and end points of every wire to be on grid. You can select the grid using that ULP, but I would advise sticking to the default grid of 100mil as most components will be designed that way.