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Old 26th August 2006, 07:09 PM   #1
ash_dac is offline ash_dac  United Kingdom
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Question Wanted: LM3886 pcb

Hi,

Does anyone have a LM3886 pcb to sell before I have a go at P2P ?
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Old 26th August 2006, 07:36 PM   #2
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Default 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.

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Old 26th August 2006, 08:55 PM   #3
DcibeL is offline DcibeL  Canada
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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.
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Old 26th August 2006, 10:44 PM   #4
Nordic is offline Nordic  South Africa
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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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Old 27th August 2006, 10:21 AM   #5
ash_dac is offline ash_dac  United Kingdom
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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.
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Old 27th August 2006, 10:28 AM   #6
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Vikash on here runs Mad About Sound which sells chip amp PCBs and kits. He's in the UK.
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Old 27th August 2006, 10:40 AM   #7
ash_dac is offline ash_dac  United Kingdom
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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)
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Old 27th August 2006, 11:27 AM   #8
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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.
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Old 27th August 2006, 11:32 AM   #9
ash_dac is offline ash_dac  United Kingdom
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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 ?
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Old 27th August 2006, 12:05 PM   #10
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Yes just stand them on end and loop the lead round, should be no problem at all.
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