ExpressPCB PCB BPA300 LM3875

ppereira · 6th November 2004, 03:43 PM

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.

ppereira · 6th November 2004, 03:46 PM

P.S. To open the LM3875B file with ExpressPCB rename it from LM3875B.PDF to LM3875B.PCB

UrSv · 6th November 2004, 05:20 PM

Why use LM3875 and not LM3886?

ppereira · 6th November 2004, 05:26 PM

I have a few LM3875's and no LM3886's...

UrSv · 6th November 2004, 07:02 PM

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?

ppereira · 6th November 2004, 08:52 PM

Thanks, I have just enough for one stereo amp... Any thoughts on the PCB?

mwmkravchenko · 11th November 2004, 07:38 PM

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

Mattyo5 · 11th November 2004, 08:14 PM

another idea

BPA-300 :-D Pcb designed!

-Matthew K. Olson

ppereira · 13th November 2004, 04:49 AM

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?

digi01 · 13th November 2004, 07:38 AM

I took a look ! its wonderful indeed

6th November 2004, 05:20 PM	#3
UrSv diyAudio Member 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.

11th November 2004, 07:38 PM	#7
mwmkravchenko diyAudio Member Join Date: Jan 2002 Location: Perth Canada	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

13th November 2004, 07:38 AM	#10
digi01 diyAudio Member Join Date: Mar 2003 Location: BEIJING	I took a look ! its wonderful indeed __________________ 2010 DIY ALBUM UPDATED UCPv1(preamp) & DUAL(power supply)

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6th November 2004, 03:46 PM	#2
ppereira 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

6th November 2004, 05:26 PM	#4
ppereira diyAudio Member Join Date: Oct 2002 Location: NJ	I have a few LM3875's and no LM3886's...

6th November 2004, 08:52 PM	#6
ppereira diyAudio Member Join Date: Oct 2002 Location: NJ	Thanks, I have just enough for one stereo amp... Any thoughts on the PCB?

11th November 2004, 08:14 PM	#8
Mattyo5 diyAudio Member Join Date: Aug 2002 Location: Farmington, CT	another idea BPA-300 :-D Pcb designed! -Matthew K. Olson

13th November 2004, 04:49 AM	#9
ppereira 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?

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