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-   -   LM3886 and LM4780 Eagle outlines (http://www.diyaudio.com/forums/chip-amps/89489-lm3886-lm4780-eagle-outlines.html)

Bob0513 2nd November 2006 07:24 AM

LM3886 and LM4780 Eagle outlines
 
Does anyone have the component outlines for the LM3886 and/or LM4780. The library on cadsoft.de that has the components is bad.

pinkmouse 2nd November 2006 08:23 AM

Search for my single sided LM4780 PCB thread. I posted the Eagle files so it has the appropriate footprint there.

CJ900RR 2nd November 2006 10:36 AM

If you find some eagle lbr for the 3886/3875 made by a Andrew or something simulare, dont remember exactly, do NOT use it.

It has the wrong hole-size AND wrong pitch (disstance between the legs). I used it for my boards and had to drill and mixture alot to fit my LM3875 in to it.

diarav 2nd November 2006 11:58 AM

If you are talking about lmopamp.lbr file, then I had no problems using the LM3886 outline on the board. Fitted perfectly. The pitch is ok. If this is the problem, perhaps you can check if your printing dimensions are coming out fine.

There is a problem with the schematic however. Some pins (I think 8, 4, 5 ) dont "connect" as they were not aligned with the grid. I manually edited the schematic for LM3886 and fixed this.

CJ900RR 2nd November 2006 03:52 PM

Quote:

Originally posted by diarav
If you are talking about lmopamp.lbr file, then I had no problems using the LM3886 outline on the board. Fitted perfectly. The pitch is ok. If this is the problem, perhaps you can check if your printing dimensions are coming out fine.

There is a problem with the schematic however. Some pins (I think 8, 4, 5 ) dont "connect" as they were not aligned with the grid. I manually edited the schematic for LM3886 and fixed this.


No I dont think it was that one. But I am not shure. In Eagle's library-list it was named "Andrew custom" I think..

The files was send to a real PCB manufacturing company, a company that deliver weekly to my work, and we never have any problems with their quality. And everything else on the PCB was correct, so my guess is still that it was the library.

anbello 3rd November 2006 04:44 PM

Quote:

Originally posted by CJ900RR



No I dont think it was that one. But I am not shure. In Eagle's library-list it was named "Andrew custom" I think..

The files was send to a real PCB manufacturing company, a company that deliver weekly to my work, and we never have any problems with their quality. And everything else on the PCB was correct, so my guess is still that it was the library.


I can confirm, "Andrew - Custom", don't use it.
I had the same problem, PCB from manufacturing company and then a lot of work to fit the LM3886 with force because of too small holes.

ciao
andrea

Alcaid 3rd November 2006 07:04 PM

I made this file some time ago.

Contains:
- LM3886
- LM4780
- OPA541

Use at own risk (double check drills, pinout, pin spacing etc.) I've used them with no problems, but I do make my own PCBs.

CJ900RR 3rd November 2006 10:01 PM

Quote:

Originally posted by Alcaid
I made this file some time ago.

Contains:
- LM3886
- LM4780
- OPA541

Use at own risk (double check drills, pinout, pin spacing etc.) I've used them with no problems, but I do make my own PCBs.


And where is the file :D

Alcaid 4th November 2006 12:26 PM

2 Attachment(s)
I attached the file, but I forgot to compress it to a valid file format. ;)


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