LM3886 library for Eagle 5 - diyAudio
Go Back   Home > Forums > Amplifiers > Chip Amps

Chip Amps Amplifiers based on integrated circuits

Please consider donating to help us continue to serve you.

Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving
Reply
 
Thread Tools Search this Thread
Old 13th October 2010, 10:48 PM   #1
diyAudio Member
 
Join Date: Aug 2008
Default LM3886 library for Eagle 5

Here is an Eagle 5 library for the LM3886 with two versions. The second one has the N/C pins removed so you can use the extra space to route traces.
Attached Files
File Type: zip LM3886_Eagle5.zip (1.2 KB, 915 views)
__________________
Tyler
  Reply With Quote
Old 14th October 2010, 07:00 AM   #2
ratza is offline ratza  Romania
diyAudio Member
 
ratza's Avatar
 
Join Date: Dec 2007
Location: Sibiu, Romania
Routing can be made over the n.c. pins anyway, since they are not connected to anything.
__________________
Any solution is a compromise.
  Reply With Quote
Old 14th October 2010, 12:40 PM   #3
diyAudio Member
 
Join Date: Aug 2008
True, but it's better not to have unnecessary holes in the middle of traces or small antennae attached to them
__________________
Tyler
  Reply With Quote
Old 15th October 2010, 05:22 AM   #4
ratza is offline ratza  Romania
diyAudio Member
 
ratza's Avatar
 
Join Date: Dec 2007
Location: Sibiu, Romania
You're absolutely right. In analogue electronics any pin is an input pin
__________________
Any solution is a compromise.
  Reply With Quote
Old 12th January 2012, 08:56 PM   #5
diyAudio Member
 
Join Date: Oct 2010
Hi Redshift I'm looking at the distance between the pins in Eagle and am not sure if they are ok.
The data sheet (Oct 2003) has the distance between the pins of 1.7mm. Your file has the gap at 1.79mm. I'm not sure how much that matters.
Can anyone confirm?
  Reply With Quote
Old 13th January 2012, 05:15 AM   #6
diyAudio Member
 
Join Date: Dec 2010
Location: wigan
Hi

0.09mm is the small diffrence Hardley worth worrying about at that pin spacing.

Regards Ian
  Reply With Quote
Old 14th January 2012, 07:27 AM   #7
diyAudio Member
 
Join Date: May 2008
10 x 0,09 = 0,9 mm. It will make a difference, even if it is not as bad as in the lmopamp libraries you can download from the Eagle homepage.

The holes are too small. The pins are 0,97 0,12 mm by 0,41 0,05 mm. The diagonal will be 1,053 0,13 mm, which means the drill must be 1,1 mm for most pins to fit. You will even need 1,2 mm for those with positive tolerances.

For the complete package it will be handy to have the N/C pins in the symbol as well, so you can actually use them for routing. They will rather improve mechanical stability and a wee bit heatsinking, than act as antennae.

It would also be nice, if symbol and package had a name and a value. Add >NAME in the tNames layer and >VALUE in the tValues layer.

In my version I set the center of pin6 at the origin. That way you don't need to correct the position depending on Imperial or metric layouts.
__________________
If you've always done it like that, then it's probably wrong. (Henry Ford)
  Reply With Quote
Old 14th January 2012, 08:28 AM   #8
diyAudio Member
 
Join Date: Dec 2010
Location: wigan
Pacificblue..

I suggest you take an lm3886 and measure the pins. the measurements in the data sheet are nominal. Also you may have noticed the setting of the pins is never that perfect as they get moved in the handleing packaging process..Also if you would like to post your PERFECT lm3886 footprint i will etch a board with the OP's I.C footprint and yours then post piccys of the result. As for the unused pins if you are worried about them acting as antennaes that much remove them from the I.C altogether .

Regards Ian

Last edited by madtecchy; 14th January 2012 at 08:32 AM.
  Reply With Quote
Old 14th January 2012, 06:36 PM   #9
diyAudio Member
 
Join Date: May 2008
I don't see the point of measuring pins, etching boards for comparison, up- and downloading files and pics, when it is so easy to correct the coordinates in the Eagle file according to the 'nominal' datasheet dimensions.

As for the unused pins, the worries about the antennae did not come from me. My suggestion is, if you draw a version with and one without the N/C pins, the version with them should offer the possibility to include them in the PCB routing, too. Otherwise you either have to route around them or mess around with unnecessary DRC error messages.
__________________
If you've always done it like that, then it's probably wrong. (Henry Ford)
  Reply With Quote

Reply


Hide this!Advertise here!
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
TAS5152 Library - Eagle 5.x suds Software Tools 0 3rd November 2009 10:39 AM
SG3525 Eagle Library rwaudio Power Supplies 1 11th March 2008 06:52 PM
lm4780 eagle library djronbxs Chip Amps 1 21st September 2007 03:14 PM
Crystal Eagle Library? mbcouple Digital Source 2 9th March 2005 09:47 AM
lm3886 library for eagle demons_wing Chip Amps 2 21st August 2004 07:35 PM


New To Site? Need Help?

All times are GMT. The time now is 06:08 AM.


vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2014 DragonByte Technologies Ltd.
Copyright 1999-2014 diyAudio

Content Relevant URLs by vBSEO 3.3.2