Wanted: LM3886 pcb

ash_dac · 26th August 2006, 06:09 PM

Hi,

Does anyone have a LM3886 pcb to sell before I have a go at P2P ?

FastEddy · 26th August 2006, 06:36 PM

http://www.national.com/pf/LM/LM3886.html#Availability

Of course the thing will probably come fully assembled with all parts. (Not much DIY here.)

You might consider writing National (or a distributor) and see who is making the bare boards for the evaluation kits ... then contact them for a bare board ... could happen, could be easy, maybe not. (National may also have an unassembled version of the eval kit ... or maybe a National engineer has a bunch in a desk drawer somewhere.)

Another source might be one of National's customers who is actually using the boards & parts in production (car audio?) and see if they will give you the sub assembly maker, and get a bare board from them.

DcibeL · 26th August 2006, 07:55 PM

If all you are looking for is PCB's, you can buy a kit from Chipamp.com that includes a power supply PCB as well. There is also Mauro Penasa's implementation of the LM3886 that is quite different from the standard LM3886 design. I would say just order PCB's from Twisted Pear Audio, but they are currently out of stock. However, if you are up for a fully stuffed PCB, I am currently selling a fully stuffed board for a 2 channel amp. See here.

If you don't want to spend hours and hours reading the thread about Mauro's amp, I can provide schematics, board layout, technical documentation, and a heatsink drill guide for the amp I am selling. The board includes a speaker protection circuit, and the relay completely removes the "pop" when the amp is turned on or off.

Nordic · 26th August 2006, 09:44 PM

My vote goes to the Mauro amp...I have a Rev C. Its like red wine, it only gets better as it gets older...

ash_dac · 27th August 2006, 09:21 AM

Quote:

Originally posted by Nordic
My vote goes to the Mauro amp...I have a Rev C. Its like red wine, it only gets better as it gets older...

Hi,

I'll have a look at My_ref. in the meantime i'm trying to design a pcb.

richie00boy · 27th August 2006, 09:28 AM

Vikash on here runs Mad About Sound which sells chip amp PCBs and kits. He's in the UK.

ash_dac · 27th August 2006, 09:40 AM

Quote:

Originally posted by richie00boy
Vikash on here runs Mad About Sound which sells chip amp PCBs and kits. He's in the UK.

Thanks. The Lm3886 board is out of stock on the website.

Not too sure about the rectifier diodes on the PSU design (16 are needed for a stereo pair)

richie00boy · 27th August 2006, 10:27 AM

What are you not sure about on the rectifiers? You mean that's a lot of diodes to buy? You could quite happily use 1N5401 instead which are much cheaper and easier to find.

ash_dac · 27th August 2006, 10:32 AM

Quote:

Originally posted by richie00boy
What are you not sure about on the rectifiers? You mean that's a lot of diodes to buy? You could quite happily use 1N5401 instead which are much cheaper and easier to find.

It looks like the pcb is setup for to220ac diodes.

edit:- can the Do-27 1N5401 be mounted easily ?

richie00boy · 27th August 2006, 11:05 AM

Yes just stand them on end and loop the lead round, should be no problem at all.

26th August 2006, 06:09 PM	#1
ash_dac diyAudio Member Join Date: Jan 2005 Location: UK	Wanted: LM3886 pcb Hi, Does anyone have a LM3886 pcb to sell before I have a go at P2P ?

26th August 2006, 06:36 PM	#2
FastEddy diyAudio Member Join Date: Jun 2006 Location: North Californie	here's one source ... evaluation boards http://www.national.com/pf/LM/LM3886.html#Availability Of course the thing will probably come fully assembled with all parts. (Not much DIY here.) You might consider writing National (or a distributor) and see who is making the bare boards for the evaluation kits ... then contact them for a bare board ... could happen, could be easy, maybe not. (National may also have an unassembled version of the eval kit ... or maybe a National engineer has a bunch in a desk drawer somewhere.) Another source might be one of National's customers who is actually using the boards & parts in production (car audio?) and see if they will give you the sub assembly maker, and get a bare board from them.

27th August 2006, 09:28 AM	#6
richie00boy Did it Himself diyAudio Member Join Date: Nov 2003 Location: Gloucestershire, England, UK	Vikash on here runs Mad About Sound which sells chip amp PCBs and kits. He's in the UK. __________________ www.readresearch.co.uk my website for UK diy audio people - designs, PCBs, kits and more

27th August 2006, 10:27 AM	#8
richie00boy Did it Himself diyAudio Member Join Date: Nov 2003 Location: Gloucestershire, England, UK	What are you not sure about on the rectifiers? You mean that's a lot of diodes to buy? You could quite happily use 1N5401 instead which are much cheaper and easier to find. __________________ www.readresearch.co.uk my website for UK diy audio people - designs, PCBs, kits and more

27th August 2006, 11:05 AM	#10
richie00boy Did it Himself diyAudio Member Join Date: Nov 2003 Location: Gloucestershire, England, UK	Yes just stand them on end and loop the lead round, should be no problem at all. __________________ www.readresearch.co.uk my website for UK diy audio people - designs, PCBs, kits and more


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26th August 2006, 07:55 PM	#3
DcibeL diyAudio Member Join Date: May 2003 Location: Saskatchewan	If all you are looking for is PCB's, you can buy a kit from Chipamp.com that includes a power supply PCB as well. There is also Mauro Penasa's implementation of the LM3886 that is quite different from the standard LM3886 design. I would say just order PCB's from Twisted Pear Audio, but they are currently out of stock. However, if you are up for a fully stuffed PCB, I am currently selling a fully stuffed board for a 2 channel amp. See here. If you don't want to spend hours and hours reading the thread about Mauro's amp, I can provide schematics, board layout, technical documentation, and a heatsink drill guide for the amp I am selling. The board includes a speaker protection circuit, and the relay completely removes the "pop" when the amp is turned on or off.

26th August 2006, 09:44 PM	#4
Nordic diyAudio Member Join Date: Sep 2005	My vote goes to the Mauro amp...I have a Rev C. Its like red wine, it only gets better as it gets older...

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