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Old 18th June 2003, 06:41 AM   #21
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jrdg usually use its metal case as gound
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Old 6th July 2003, 11:37 AM   #22
Luke is offline Luke  New Zealand
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anyone got any ideas what the schematic looks like?
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Old 6th August 2003, 11:32 PM   #23
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Any "back-engineered" schematic available for the Rowland Concentra or Model 10/12 ? thanks.
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Old 7th August 2003, 10:12 AM   #24
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Concerning Linn2250, perhaps this picture might help .
I can't remember if it was TDA7294 or TDA7293V, but definitely 3 of them paralleled.
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Old 9th September 2003, 01:04 AM   #25
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Quote:
Originally posted by cm961
It looks like a very nice amp, I hope mine turns out like that

As soon as I get a mill machine and start making two sided PCBs, the possibilities will be endless.

Pete
Mills are certainly affordable:
http://www.harborfreight.com/cpi/cta...emnumber=44142


PCB Mills are not that expensive, either.
http://xenonresearch.com/html/xenpcb.shtml
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Old 9th September 2003, 06:42 AM   #26
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This is what I ment in this thread. Jeff Rowland looks how it can be expected, very shiny solder joints. I wonder though why the have an opamp in a socket?. Very nice with red pcb, very unusual. Comparte the looks with a Gaincard....inside!
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Old 12th April 2004, 11:05 AM   #27
LBHajdu is offline LBHajdu  United States
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I too would be interested in building a similar amp. On the Jeff Rolland site I found a review of there Concentra. It was not in English. There was however an abstract schematic of the amp there.
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Old 15th April 2004, 09:18 AM   #28
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If anyone is interested those nice 1% non inductive metal output damping resistors informational PDF is available here: Vishay/Dale output resistors The ones shown in Kuei Yang Wang's pictures are sold @ Mouser for $1.03 USD Mouser

-Tom
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Old 10th October 2006, 04:45 AM   #29
Mrpong is offline Mrpong  Thailand
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I'm wondering. Why doens't it have elec caps (i.e. 1000uf) near each chip? How is power sent to each chip enough?
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Old 11th November 2006, 01:26 AM   #30
rjm is offline rjm  Japan
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Is six LM3875 / LM3886s per channel better than one? Certainly more power. Less heat stress on the chips, lower output impedance. Would it also have a better S/N? Not sure. Sound better? Dunno.

Looks like fun to try though. I found the following app note from Apex to be useful:

Apex Application Note #20

Looking through it, one needs to pay attention to the slave amps since they run in unity gain and thus less stable than the main amp which can have a gain of 20 or 30 or so. They recommend using noise gain compensation.

That's if you are going to configure it all as a parallel bridge. Using an input transformer as a phase splitter and running all the amps directly from the tansformer output signal removes this issue completely. :-/

/R
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