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Home » CadSoft Support Forums » eagle.support.eng » Help with fixing ground connections, and pin4 on op amp
Help with fixing ground connections, and pin4 on op amp [message #170537] Mon, 22 May 2017 17:12 Go to next message
Mike Pukmel
Messages: 2
Registered: May 2017
Junior Member
Brand new to Eagle and circuit boards.  Climbing the learning curves.
I managed to get a schematic typed in and saved and fixed the 'error' items in the review.  On my 4th or 5th attempt to get the board setup.

I have the board partially done.    I had originally placed all of the components, before putting the copper ground area on with the polygon tool.  A bunch of components that have the ground symbol connected on the schematic are all tied together in the board layout.    I guess Eagle does that by default.    This created a whole bunch of traces that don't need to be there, which greatly complicated getting the traces routed.

The problem is that after I put the copper ground area on, I can't figure out how to delete the connections that Eagle had routed together.    I just want to route these to the ground area individually.   


When I tried to delete a  trace,  I got an error "you have to do this in the schematic" but the schematic is not wrong.   It just has a bunch of components and pins routed to a ground symbol. 

****

The other problem is that Eagle has pin4 of op amps Im using labelled 3.3v.   In the schematic, pin4 is grounded.   Is this a problem?  I have some trace running to ground and it has "3.3V" written on it.   It looks like this is wrong.

Thanks!

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Re: Help with fixing ground connections, and pin4 on op amp [message #170539 is a reply to message #170537] Mon, 22 May 2017 17:36 Go to previous messageGo to next message
rachaelp
Messages: 604
Registered: March 2015
Location: UK
Senior Member
Hi Mike,

So the problem you are having is that when people create components and use pin type PWR for the power pins then EAGLE automatic connects them together. The problem is the naming across parts in the standard library is inconsistent and also its not defined what for example V+ and V- of an OPAMP should be so just connecting devices with those named parts together may not be appropriate. This is one of the (many many many) reasons why I would recommend you create your own library parts and not using the "free" libraries that ship with EAGLE because, well, they're not really very good.

When you try to delete a trace and it give that error, it's because to do that in the board you need to be using the Rip-up tool instead.

Best Regards,

Rachael

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Re: Help with fixing ground connections, and pin4 on op amp [message #170547 is a reply to message #170539] Tue, 23 May 2017 15:32 Go to previous message
Mike Pukmel
Messages: 2
Registered: May 2017
Junior Member
Hi Rachael,
     Thank you very much for the reply and info.    Climbing the learning curve here!
Best Regards,
Mike

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