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Old 15th September 2008, 10:47 PM   #21
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Hi thank you fredlock .

The power of this amp is 10 Watts at 8ohm load.

And I don't have PCB layout . Because this is wireing by
single line of a diameter of 0.5mm .
(using Gold-plated OFC line + fluoric resin clothing for
electronics diy. appening the fig)

"openhearted" means like NO-NFB amp, or not suppressive ....
( Sorry for not expressible well....)

Sincerely
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Old 16th September 2008, 03:14 AM   #22
lineup is offline lineup  Sweden
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I, too use copper.
And no PCB.
And solid wire.

But my copper is ordinary with lots of Oxygene!
Because we have Oxygene in Air in Sweden. And Nitrogene.
And I use plastic PVC insulation.
Diameter is 0.6 mm Cu .. and works well.
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Old 16th September 2008, 03:17 AM   #23
lineup is offline lineup  Sweden
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schema
http://www.diyaudio.com/forums/attac...amp=1221496249

LME49710 is good!
LME49870 is better .. if you can find & buy.
Not so easy, I know.
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Old 16th September 2008, 12:37 PM   #24
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HI Lineup,

There is Oxygene in Air in Japan ,too.
So I use Tin plating@or Gold plating wire for audio .

And I useed OPamp for DC servo AD8620 , now change LME49860NA,
It's better too. Bi poler input (may be) ,but DC offset is not so large, 5mv and 8mv.

I think LME49860 is better than LM4562 . too.
So I agree (can understand) you say LME49870 is better than LME49710 .But near my city ,I can't buy.....
I guess it may be inner cascord circuit for high power supply??

Thank you!

Sincerely
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Old 17th September 2008, 04:38 AM   #25
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Hello turnA_zpoint,

A question to you regarding your feedback (just so I can try to understand what you are doing):

Looking at the AD8620 opamp, it looks like the inverting terminal input is the combination of the scaled down output voltage, and the input voltage summed together.
It looks like the input to the noninverting terminal of the AD8620 is a combination of the integrated sum of the scaled output and input.

Am I correct so far?

I'm sorry if you explained this before, but can you explain the purpose of this kind of feedback (that uses both the input voltage and the output voltage) over a "normal" DC servo opamp feedback (that only uses the output voltage) to cancel out DC offset at the output?

Many thanks to you for posting your schematics!
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Old 17th September 2008, 05:47 AM   #26
lineup is offline lineup  Sweden
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Quote:
Originally posted by turnA_zpoint
HI Lineup,
So I agree (can understand) you say LME49870 is better than LME49710.
But near my city, I can't buy.....
Same for me. If I wanted to buy LME49870 or LME49860 (dual).
I can not. Can not find anyone in Sweden sell LME49870.
... not many in EUROPE!


About your circuit.
Your feedback arrangement is so complicated, I do not understand

But what would you say is the difference in result
- using your way to correct signal, using negative feedback
- using 'normal' global negative feedback
Is there any better quality in the resulting output that you want to have?
And what is this quality?
Harmonics dist spectrum? Level of intermodulation dist? Level of THD?
.... why use your complicated amplifier correction ....
.... instead of normal old fashion feedback ....
because for me
the normal FB is so much easier to implement


Lineup regards
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Old 17th September 2008, 05:58 AM   #27
lineup is offline lineup  Sweden
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here you have one SEARCH for Part in STOCK
there are several hits
but not all those sellers REALLY have in stock LME49870
http://www.ic2ic.com/search.jsp?sSearchWord=LME49870

Most hits are from HongKong & China
Quote:
LME49870MAX
IC DIP/SMD 1000 SN 2006 Stock China 08-09-15 Fantastic Technologies limited.
The upper's company is [premium service company] For further information, please contact the IC2IC.com CLICK!!
LME49870MA/NOPB 1 NATIONAL Hong Kong 08-08-14 QIDA(HK)ELECTRONICS CO., LTD.
LME49870MAX IC DIP/SMD 1000 SN 2006 Stock China 08-09-15 Kairong Electronics Ltd.
LME49870MA IC DIP/SMD 1000 SN 2006 Stock China 08-09-15 Kairong Electronics Ltd.
LME49870MAX SOIC 500 NS in stock China 08-09-13 Fantastic technologies Ltd
LME49870MA SOIC 500 NS in stock China 08-09-13 Fantastic technologies Ltd
LME49870MAX SOIC 500 NS in stock China 08-09-10 HK Fantastic technologies Ltd
LME49870MA SOIC 500 NS in stock China 08-09-10 HK Fantastic technologies Ltd
LME49870MA 2Parts All contents IC DIP/SMD 1000 SN 2006 Stock China 08-09-15 Fantastic Technologies limited.
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Old 17th September 2008, 06:01 AM   #28
lineup is offline lineup  Sweden
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Digikey in Japan
looks like having 110 pieces In Stock of LME49870

http://jp.digikey.com/scripts/dksear...=LME49870MA-ND
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Old 17th September 2008, 08:34 AM   #29
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Default Oh!... an advanced audiophile has landed here


Please... stay with us my dear friend.

Good to have you here... awsome schematic. great ideas.

Sayonara,

Carlos
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Old 17th September 2008, 08:48 AM   #30
lineup is offline lineup  Sweden
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Hello south-america.

What in this special circuit is so great, Carlos?
What are the benefits you can see?
I still haven't figured this out.
The man is a clever young man from Asia. Very clever!

But what in his circuit, would you say Charlie of Brazil,
is better than your Dx-Amp simple ordinary global negative feedback?

I am sure you can tell, Destroyer X.
As you say you have seen how great his schematic is
But if I am mistaken,
I will wait for turnA_zpoint to tell me & others not fully as clever.

Lineup clever audio circuits

.
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