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Chip Amps Amplifiers based on integrated circuits

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Old 6th February 2004, 02:44 PM   #1
loong is offline loong  United Kingdom
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Talking Your ideal CG, unlimited budget

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Old 8th February 2004, 04:19 PM   #2
Nuuk is offline Nuuk  United Kingdom
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Gaincard????
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Old 8th February 2004, 04:27 PM   #3
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http://www.jeffrowland.com/Model%2012%20Page.htm

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Old 8th February 2004, 05:34 PM   #4
loong is offline loong  United Kingdom
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Quote:
Originally posted by Nuuk
Gaincard????
Sorry for my misspelling



I mean your ideal "ChipAmp"
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Old 8th February 2004, 06:14 PM   #5
Faber is offline Faber  Italy
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Quote:
Originally posted by tbla
http://www.jeffrowland.com/Model%2012%20Page.htm


Me too :-)

Possible that nobody have enough documentation to build a concentra-clone?


bye!
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Old 8th February 2004, 08:10 PM   #6
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Quote:
Originally posted by loong


Sorry for my misspelling



I mean your ideal "ChipAmp"
I changed it for you.
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Old 9th February 2004, 12:26 AM   #7
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Quote:
Originally posted by Faber



Me too :-)

Possible that nobody have enough documentation to build a concentra-clone?


bye!
Well, I saved these images from a review that appeared in a Italian (if I remember correctly) audio mag. The photo's are from the Rowland Integrated amp which has the same circuitry as their other amps (which use 6 devices per channel) The image of the basic balanced circuit was from memory. (Hope it is right!) Also, for you "DC servo offset" fans, please look closely at the bottom photo. It appears JR has found that it is unnescessary. (contrary to what National Semi's BP-200 application paper seems to indicate).

Enjoy!

-T



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Old 9th February 2004, 04:59 AM   #8
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the scematics is wrong, the transformer drives the volumecontrol 3310 wich then drives the unbalanced to balanced circuit and this drives the 2 x 3 lm3886......
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Old 9th February 2004, 08:23 AM   #9
Faber is offline Faber  Italy
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The most people talks about the transformer as the principal actor in the concentra's fine sound. I believed that it was used to balance the signal as depicted in the tecnofossil's post.

wich kind of balancer do they use? Also, I tried to take a closer look to the pictures posted and others found on this forum. It seems that they use only SMD components, but I'm not able to find SMD components with normal GC design capacitance (where is the classical 1000uF x rail capacitor?)

Well, soon it will be a hifi fair in Milan, I'll ask to look at the interior ;-)

Bye!
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Old 9th February 2004, 11:38 AM   #10
matjans is offline matjans  Netherlands
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well, if we're speaking chipamps and not gainclones, my personal favorite (at the moment) is the linn klimax...
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