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Old 3rd November 2007, 05:15 PM   #31
EUVL is offline EUVL  Europe
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> those resistors are just drawn somewhat different than usual at Pap's schmtcs...... or I'm blind ........ hehe

Look again, where the 221k feedback resistor is connected to -- not the output !!

> I told you - I can't hear or measure difference in this circuit between 109 and 74.

Measure your DC offsets during warm-up.
You are right, you don't hear DC offsets.

We agree to disagree.
Other people can judge for themselves, based on technical facts.


Patrick
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Old 3rd November 2007, 06:35 PM   #32
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Quote:
Originally posted by EUVL
> those resistors are just drawn somewhat different than usual at Pap's schmtcs...... or I'm blind ........ hehe

Look again, where the 221k feedback resistor is connected to -- not the output !!

well - I'm Choky , but you also didn't wrote it good enough ;
anyway - Aleph CCS modulation is from usual point , but what isn't - is feedback take point !
bingo - congrats!!

seems that you found meaning of what Papa wrote on FW site - about improving Aleph J

Quote:
> I told you - I can't hear or measure difference in this circuit between 109 and 74.

Measure your DC offsets during warm-up.
You are right, you don't hear DC offsets.
well - I measure and listen after warm up

Quote:

We agree to disagree.
Other people can judge for themselves, based on technical facts.


Patrick

well said . we are here for and because of that .......
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Old 3rd November 2007, 06:48 PM   #33
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Papa- what's most important difference you gained with relocating feedback take point?

care to elaborate ?


this :

"There will be an update for Aleph Jís which offers improvements in distortion and also turn-on/turn-off noise."

?
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Old 3rd November 2007, 07:01 PM   #34
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Quote:
Originally posted by Zen Mod
Papa- what's most important difference you gained with relocating feedback take point?
That's an error in the schematic. The performance difference is
a lower damping factor, but not by much.

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Old 3rd November 2007, 07:06 PM   #35
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Yes, indeed the feedback is taken before the sensing resistors.

And R27 still sets the voltage reference of about 0.3V across 0.47R on the CCS Rsource...for about 1.25A of total bias.
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Old 3rd November 2007, 07:08 PM   #36
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OK, NP confirmed errata so feedback is still from output terminal.
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Old 3rd November 2007, 07:45 PM   #37
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Quote:
Originally posted by Nelson Pass


That's an error in the schematic. The performance difference is
a lower damping factor, but not by much.







Papa you deserve another bottle of rakija just for that line...........

what a grounding from sky high for greedy boyz (what we are) .......





EDIT:

here it is , little modified to be drawn (almost ) as usual


(hehe - what if I choose to draw it with + down and - above )
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File Type: jpg drawnasusual.jpg (70.3 KB, 4769 views)
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Old 3rd November 2007, 08:12 PM   #38
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another one ........

Papa - R27 intentionally placed B-C on Q4 ?
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Old 4th November 2007, 12:41 AM   #39
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It's time to build my first Aleph amp.
I hope I will be not disappointed with . . .

Mmm . . .
This month: chassis and pcb design
December: collection of good components
Jan-Mar 2008: construction and finish . . .


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Old 4th November 2007, 01:18 AM   #40
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Quote:
Originally posted by Zen Mod



......

here it is , little modified to be drawn (almost ) as usual


...........

like always - I'm faster than thought ........ and price is payed

flipped few caps etc

this time - I hope better - drawn in usual way ..........


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