gainclone and jeff rowland

[tbla]

ok - great.....can anyone translate please, just a resume...?

 

[audioPT]

try this:

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

www.diyzone.net/sections.php?op=viewarticle&artid=11
(use copy link and paste)

in the translate URL

I think you can get something out of the translation


Pedro Martins

 

[Ricren]

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

 

[Peter Daniel]

Re: 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

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.

 

[Ricren]

Re: Re: How are they tied?

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

 

[tiefbassuebertr]

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:
http://www.diyaudio.com/forums/soli...1-schematic-modules-wanted-5.html#post3782041
http://www.diyaudio.com/forums/chip-amps/131275-jeff-rowland-concentra-amplifier.html
http://www.diyaudio.com/forums/chip-amps/16396-bridgeclone-rowland-concentraclone.html
http://www.diyaudio.com/forums/chip...ons-tda7293-tda7294-lm3886-etc-available.html