Identifying fake LM3886

Scrappydoo · 21st May 2009, 10:17 AM

Hi, can anyone identify these as being fake?
And what is the best method for identifying fake LM3386's?

Thanks.

Francec · 22nd May 2009, 08:13 AM

What is the prize?

blueskynis · 22nd May 2009, 08:16 AM

To me they all look genuine. Why do you think they are fake?

Francec · 22nd May 2009, 08:18 AM

Prize?
The TFs are completely plastic coated so they look alright.

Anyway, what is the prize?

Dxvideo · 22nd May 2009, 11:06 AM

Is it enought to see just a plastic coat on the chip to identify it as "original"????
I think all they are fake... I dont like their letter styles and colors. They must be more clear and more yellow (like laser type)..

Scrappydoo · 22nd May 2009, 11:32 AM

Sorry guys no prize.

These were fitted to circuit boards that I had bought before I knew that fakes existed.
What has made me think these are fakes are the caps supplied on the boards are 10000uF 105c usr Rubycons that are definitely fake, as they were only available as 85c.

I have replaced all the chips with genuine LM3886 and noticed an improvement in the sound. Could be psychoacoustic but I don't think so.
I've sent a message off to National semiconductors to see if they can tell whether or not they are fake.
But I thought I would ask here too.
Thanks.

mjf · 22nd May 2009, 11:44 AM

hello.
lm 3886

AndrewT · 22nd May 2009, 11:49 AM

Hi,
the JM46AD looks smudged.

The "N" symbol seems to vary in thickness with the others.

Should the labeling be painted on or lasered on?
Does it depend on age? Did national change during production?

Send them back to National for confirmation.
They may just send you genuine samples in return.

gainphile · 22nd May 2009, 11:52 AM

Quote:

Originally posted by Scrappydoo
Sorry guys no prize.

These were fitted to circuit boards that I had bought before I knew that fakes existed.
What has made me think these are fakes are the caps supplied on the boards are 10000uF 105c usr Rubycons that are definitely fake, as they were only available as 85c.

Were they from ebay? I was planning to buy few of them before being warned about fakes. At least yours were not 'sanded' as shown on the other thread.

btw. the marking on 3875 from diyaudioprojects site seems to be the "non-yellow" too?

GregKramer · 24th May 2009, 02:50 PM

Quote:

Originally posted by AndrewT
Hi,
the JM46AD looks smudged.

The "N" symbol seems to vary in thickness with the others.

Should the labeling be painted on or lasered on?
Does it depend on age? Did national change during production?

Send them back to National for confirmation.
They may just send you genuine samples in return.

National will not do a failure analysis on a device unless you purchased the product from a franchised distributor. They do not have the man power (or money to waste)to deal with the other requests.

21st May 2009, 10:17 AM	#1
Scrappydoo diyAudio Member Join Date: Feb 2009	Identifying fake LM3886 Hi, can anyone identify these as being fake? And what is the best method for identifying fake LM3386's? Thanks.

22nd May 2009, 08:16 AM	#3
blueskynis diyAudio Member Join Date: Aug 2007 Location: Serbia, Nis	To me they all look genuine. Why do you think they are fake? __________________ Windows-free with Fedora 12 == www.diy-audio-engineering.org ==

22nd May 2009, 11:06 AM	#5
Dxvideo diyAudio Member Join Date: Nov 2003 Location: Turkey	Is it enought to see just a plastic coat on the chip to identify it as "original"???? I think all they are fake... I dont like their letter styles and colors. They must be more clear and more yellow (like laser type).. __________________ Best regards, Ozgur

22nd May 2009, 11:49 AM	#8
AndrewT diyAudio Member Join Date: Jul 2004 Location: Scottish Borders	Hi, the JM46AD looks smudged. The "N" symbol seems to vary in thickness with the others. Should the labeling be painted on or lasered on? Does it depend on age? Did national change during production? Send them back to National for confirmation. They may just send you genuine samples in return. __________________ regards Andrew T.

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22nd May 2009, 08:13 AM	#2
Francec diyAudio Member Join Date: Jul 2006 Location: Port Melbourne	What is the prize?

22nd May 2009, 08:18 AM	#4
Francec diyAudio Member Join Date: Jul 2006 Location: Port Melbourne	Prize? The TFs are completely plastic coated so they look alright. Anyway, what is the prize?

22nd May 2009, 11:32 AM	#6
Scrappydoo diyAudio Member Join Date: Feb 2009	Sorry guys no prize. These were fitted to circuit boards that I had bought before I knew that fakes existed. What has made me think these are fakes are the caps supplied on the boards are 10000uF 105c usr Rubycons that are definitely fake, as they were only available as 85c. I have replaced all the chips with genuine LM3886 and noticed an improvement in the sound. Could be psychoacoustic but I don't think so. I've sent a message off to National semiconductors to see if they can tell whether or not they are fake. But I thought I would ask here too. Thanks.

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