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Old 18th September 2007, 04:37 PM   #11
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Quote:
Originally posted by Stefanoo
were both PCB, AX and this, used only for testing purposes?
Where do you get your board done once they've passed testing session?
What specs do you use for the board: thikness of the copper and so on?
AX pcb remained the same. It has somewhat wider traces, but most of all shorter. So trace dissipation was not a concern here.
If the U.P. boards are to be remade, they will be made by a professional shop, but in an indefinite future.
I'd have to widen the power traces and have them with a 70m thick copper

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Old 18th September 2007, 04:38 PM   #12
gl is offline gl  United States
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Hi Cheff,

Beautiful job on the amp. An excellent project - and thank you for sharing it. That definitely looks like a contender for the ".5" title in my opinion!

By the way, that's a very interesting update on the relative offset adjustment from the one shown in the "adventures" thread.

Graeme
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Old 18th September 2007, 06:02 PM   #13
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Thanks Graeme,

Yes, the offset stability remains quite awesome. I planned some place on the pcb for the 'Aleph-X style' power resistances from output to ground, but the first tests showed they were absolutely not necessary Even with the feedback loop not including the output mosfets, the differential offset is below 5mV. Absolute offset is wandering a bit more than with global feedback, but stays within +/- 10mV. And no matching other than the power mosfets has been done.
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Old 18th September 2007, 06:04 PM   #14
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Quote:
Originally posted by CheffDeGaar
If the U.P. boards are to be remade, they will be made by a professional shop
Jefe,

the ones in the picture are produits artisanale de la maison ?

(Escoffier would have been proud, i see you even fixed the mice problem.)
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Old 18th September 2007, 06:43 PM   #15
Manu is offline Manu  Europe
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Cheff

Manuel
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Old 18th September 2007, 07:36 PM   #16
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Beautiful work.

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Old 18th September 2007, 09:45 PM   #17
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Quote:
Originally posted by jacco vermeulen


Jefe,

the ones in the picture are produits artisanale de la maison ?

(Escoffier would have been proud, i see you even fixed the mice problem.)
Jacquot,
(Un)fortunately, c'est un produit semi-artisanal
Pcbs are made by a local shop, but l'ancienne : insolation, etching & tinning are made la main.
And for the mice, i've got a cat to take care of them. Les souris d'agneau, je m'en charge

Quote:
Originally posted by Nelson Pass
Beautiful work.

Deep thanks, Mr Pass.
Really.
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Old 18th September 2007, 09:53 PM   #18
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Cheff,
That's Top Gun work... congratulations for that clean and awesome boards and great amp.
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Old 18th September 2007, 10:36 PM   #19
gl is offline gl  United States
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Cheff,

What is the purpose of the DIP packages (IC's?) and surrounding circuitry in the center of the board?

Graeme
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Old 18th September 2007, 11:00 PM   #20
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Quote:
Originally posted by apassgear
Cheff,
That's Top Gun work... congratulations for that clean and awesome boards and great amp.
Thanks Tony

Quote:
Originally posted by gl
Cheff,

What is the purpose of the DIP packages (IC's?) and surrounding circuitry in the center of the board?

Graeme
Graeme,
It's the output DC detection circuitry (page 3 of the pdf)

Cheers
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