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Old 29th April 2003, 01:49 PM   #61
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ok - great.....can anyone translate please, just a resume...?

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Old 29th April 2003, 07:38 PM   #62
audioPT is offline audioPT  Portugal
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try this:

http://babelfish.altavista.com/
and insert this

http://www.diyzone.net/sections.php?...ticle&artid=11
(use copy link and paste)

in the translate URL

I think you can get something out of the translation


Pedro Martins
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Old 1st May 2003, 05:00 AM   #63
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Default How are they tied?

Hi folks,

I noticed that the 3886 amps in the Rowland amp are not screwed to the heatsink. Can anybody thell me how are they fixed?

cheers

Ric
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Old 1st May 2003, 05:10 AM   #64
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Default Re: How are they tied?

Quote:
Originally posted by Ricren
Hi folks,

I noticed that the 3886 amps in the Rowland amp are not screwed to the heatsink. Can anybody thell me how are they fixed?

cheers

Ric
If you look at the picture from post #40 in this thread, you will notice a bar on ea. side (gold color) which is fastened to the heatsink with 4 Allen screws. This bar presses the chips onto the heatsink.
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Old 1st May 2003, 05:23 AM   #65
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Default Re: Re: How are they tied?

Quote:
Originally posted by Peter Daniel


If you look at the picture from post #40 in this thread, you will notice a bar on ea. side (gold color) which is fastened to the heatsink with 4 Allen screws. This bar presses the chips onto the heatsink.

Ahhhhhh! So the bar was removed to thake the photo on post #42, right?
Very nice, thanks for the information.

cheers

Ric
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Old 17th January 2014, 06:33 PM   #66
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Quote:
Originally Posted by miguel2 View Post
Hi,

I think I got the gainclone bug

Digging on the web I saw that the jeff rowland concentra uses some concepts that are mentioned in this forum regarding the gainklones, like the use of LM3886 and battery supply. Taking a look at

http://www.jeffrowland.com/review16b.htm

we can see that:

1 - input is through a tranformer and an AD815

2 - output are 6 x LM3886

TI has an application ("Complete Audio Amplifier") where they use a OPA134 input opamp, that serves to make the treble and bass controls, and then a simple OPA548 (replaceable by the usual suspects).

My question/thoughts are if these more elaborated designs can be better than the gainclone. And if there is a point in converting an unbalanced signal to balanced signal inside the amp to send it to the further stages. And if the transformer is necessary or the input opamp can do it.

Miguel
The mentioned URL is death in the meantime. Who know the currently web address?

P.S.: check out also this threads:
Jeff Rowland Coherence 1 - Schematic for the Modules wanted
Jeff Rowland Concentra amplifier
Bridgeclone - Rowland Concentraclone
Why are there only disastrous PCB Versions for TDA7293/TDA7294/LM3886 etc. available?

Last edited by tiefbassuebertr; 17th January 2014 at 06:37 PM.
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