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Old 30th December 2006, 05:49 AM   #1
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Default TDA8920 based amp module

I was just browsing ebay and found this little board. I haven't seen anything with this chip posted before, so here you go.

http://cgi.ebay.com/Class-D-digital-...QQcmdZViewItem

Haha, I like the silkscreen on the board.... "state of D art".
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Old 30th December 2006, 07:37 AM   #2
Pano is offline Pano  United States
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Nice find!

I have not heard the Phillips chips- anyone?


Looks like the seller has sold about 6 or 7 of these- 3 to the same person.
Shipping is about as much as the purchase price. Typical eBay ruse....
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Old 30th December 2006, 02:22 PM   #3
BWRX is offline BWRX  United States
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So... this guy basically copies the reference design (pcb, parts, etc.) straight from the datasheet and is trying to sell them. That's legal, right?
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Old 30th December 2006, 03:25 PM   #4
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Quote:
Originally posted by BWRX
So... this guy basically copies the reference design (pcb, parts, etc.) straight from the datasheet and is trying to sell them. That's legal, right?
Doh, your right......even down to the last little bit of silkscreen. I had browsed through the data sheet when I first found it, but I didn't scroll down all the way.

Think there's any chance these are reference boards from Phillips?
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Old 30th December 2006, 03:32 PM   #5
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from the ebay page:

Quote:
the circuit diagram and PCB layout, Part list was include in Philips TDA8920TH/N1 data sheet it is avaliable on Philips Semiconductor Website http://www.nxp.com/pip/TDA8920TH_N1.html
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Old 30th December 2006, 05:34 PM   #6
BWRX is offline BWRX  United States
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Yep, that's why I asked this question.

Quote:
Originally posted by BWRX
That's legal, right?
It wasn't meant to be sarcastic if that's how it came across
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Old 30th December 2006, 08:24 PM   #7
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Quote:
Originally posted by BWRX
It wasn't meant to be sarcastic if that's how it came across
I have sarcasm coursing through my veins, so yes, that's how I took it.

Click the image to open in full size.
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Old 30th December 2006, 09:07 PM   #8
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Quote:
Originally posted by BWRX
That's legal, right?
An interesting question.....

Certainly Phillips has a copyright on the design and layout. I doubt you can just take their design and start cloning and selling it. But on the other hand, would they care? They just want to sell chips, right?

The copyright laws may not apply in Thailand. But they would apply to selling here.

As stated above - maybe these are the real thing. Phillips has to have them built somewhere. Not likely they're doing it in the Netherlands. So maybe this guy has a way to get his hands on them straight form the plant. Who knows?

EDIT: Tell you what. I'll try to contact some of the buyers to see what they think of the boards. Will report here.
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Old 2nd January 2007, 08:19 AM   #9
Pano is offline Pano  United States
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I did hear back form one of the buyers. He says it is a clone, not the original reference board.

He also says that his did not work when he got it and also: "Some poor choices were made on component sizing and do not fit well on the PCB. For instance, adjacent caps - 1st one fits, 2nd one has to have leads bent a little, 3rd one a lot, 4th one just barely tacked to pads."

Sounds like a "buy at your own risk" thing.
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Old 2nd January 2007, 09:23 PM   #10
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Heard back from another buyer. He had no problems and likes the soundof the amps.

"their sound is very open and spacious. Very easy setup" he says.
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