ExpressPCB PCB BPA300 LM3875 - 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 6th November 2004, 02:43 PM   #1
diyAudio Member
 
Join Date: Oct 2002
Location: NJ
Default ExpressPCB PCB BPA300 LM3875

I am trying to get a PCB board made following the schematic for the 200W Bridge-Parallel specified in:

http://www.national.com/an/AN/AN-1192.pdf

with 6 x LM3875 per channel instead of 4 as in the App Note. Before I send it I was hoping someone would point out any errors...

The ExpressPCB file is attached.

ExpressPCB can be downloaded for free at:
http://www.expresspcb.com

Thank you.
Attached Files
File Type: pdf lm3875b.pdf (78.4 KB, 415 views)
  Reply With Quote
Old 6th November 2004, 02:46 PM   #2
diyAudio Member
 
Join Date: Oct 2002
Location: NJ
P.S. To open the LM3875B file with ExpressPCB rename it from LM3875B.PDF to LM3875B.PCB
  Reply With Quote
Old 6th November 2004, 04:20 PM   #3
UrSv is offline UrSv  Sweden
diyAudio Member
 
UrSv's Avatar
 
Join Date: Jan 2002
Location: Sweden
Why use LM3875 and not LM3886?
__________________
UrSv
Those who say it can't be done should not stop those who are doing it.
  Reply With Quote
Old 6th November 2004, 04:26 PM   #4
diyAudio Member
 
Join Date: Oct 2002
Location: NJ
I have a few LM3875's and no LM3886's...
  Reply With Quote
Old 6th November 2004, 06:02 PM   #5
UrSv is offline UrSv  Sweden
diyAudio Member
 
UrSv's Avatar
 
Join Date: Jan 2002
Location: Sweden
Quote:
Originally posted by ppereira
I have a few LM3875's and no LM3886's...
A reason as good as any. For me it is the opposite. How about a trade?
__________________
UrSv
Those who say it can't be done should not stop those who are doing it.
  Reply With Quote
Old 6th November 2004, 07:52 PM   #6
diyAudio Member
 
Join Date: Oct 2002
Location: NJ
Thanks, I have just enough for one stereo amp... Any thoughts on the PCB?
  Reply With Quote
Old 11th November 2004, 06:38 PM   #7
Mark Kravchenko --- www.kravchenko-audio.com
diyAudio Member
 
mwmkravchenko's Avatar
 
Join Date: Jan 2002
Location: Perth Canada
Default I took a look !

Nice job!!

I have some questions. Do you think that your speaker supply lines are thick enough? Consider how much current is going through them.

And why no active servo? Makes for better power sharing amongst the chips.

Food for thought. And a job well done.

Mark
__________________
Mark
  Reply With Quote
Old 11th November 2004, 07:14 PM   #8
diyAudio Member
 
Join Date: Aug 2002
Location: Farmington, CT
Send a message via AIM to Mattyo5
another idea

BPA-300 :-D Pcb designed!

-Matthew K. Olson
  Reply With Quote
Old 13th November 2004, 03:49 AM   #9
diyAudio Member
 
Join Date: Oct 2002
Location: NJ
Thanks for replying.

mwmkravchenko: good point on the thickness of the traces. thank you. I started with a servo version but it became too complex and I too lazy to finish it....

UrSv, nice work much cleaner than mine... Would you mind sending me your version? BTW, I didn't read the whole thread, did you end up making and building the PCB version?
  Reply With Quote
Old 13th November 2004, 06:38 AM   #10
digi01 is offline digi01  China
diyAudio Member
 
digi01's Avatar
 
Join Date: Mar 2003
Location: BEIJING
Send a message via MSN to digi01
I took a look ! its wonderful indeed
  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
Real-size pics from ExpressPCB DragonMaster Everything Else 1 27th March 2006 03:09 PM
TO-220-11 library for expresspcb? rs1026 Chip Amps 7 13th February 2006 07:34 PM
ALEPH 2 PCB (ExpressPCB Format) ppereira Pass Labs 3 20th December 2004 12:13 PM
OPA549 footprint for ExpressPCB sobazz Chip Amps 1 31st March 2004 03:07 PM


New To Site? Need Help?

All times are GMT. The time now is 09:10 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