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Old 12th January 2003, 12:41 PM   #41
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Hi Mlloyd1,

You do not like tubes?

For completeness:

http://www.borbelyaudio.com/hybrid.pdf

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Old 16th May 2003, 08:38 PM   #42
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Default I/V TDA1541A S1 DAC

I don't think is wise to start another thread on the same subject, so here is my question.

I'm replacing the CFB AD844 I/V originally proposed by Jung on his Pooge articles on the CDB650 CDP with the LM6181 CFB opamp.

Sure I'm doing somethig wrong so please give some advise.

The Dac connection is going to the inverting input of the opamp through a 220 Ohms and the feed back is a 1K Ohms. I also have a 47 Ohms resistor at the output to isolate cable capacitance.

The result is nice but with a lot of noise indeed.

What's wrong?
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Old 16th May 2003, 08:45 PM   #43
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Just to give some more information. The stage has no low pass filter. And the load of the Opamp, besides de cable, is a 50K attenuator.
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Old 17th May 2003, 12:12 AM   #44
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Why is it going through 220 ohms??????? And why no output filter?????

Just in case anyone cares.....I used the AD846 as an I/V before I came up wit the one you guys are trying to reverse engineer.

The reason why is that our dealers did not like the sound of the CFB I/V.

And while we are at it......................here is one more for you guys to ponder......mostly Elso [joke]........

On the op-amp I/V stages, I pumped a 1.8 mA current into the input to cancel out the unipolar current the '1541 puts out. And that current was servo controlled.

Jocko
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Old 17th May 2003, 01:42 AM   #45
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Quote:
Originally posted by Jocko Homo
On the op-amp I/V stages, I pumped a 1.8 mA current into the input to cancel out the unipolar current the '1541 puts out. And that current was servo controlled.
AND?

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Old 17th May 2003, 08:42 AM   #46
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Angry NOT FUNNY!

Quote:
Originally posted by Jocko Homo
Why is it going through 220 ohms??????? And why no output filter?????

Just in case anyone cares.....I used the AD846 as an I/V before I came up wit the one you guys are trying to reverse engineer.

The reason why is that our dealers did not like the sound of the CFB I/V.

And while we are at it......................here is one more for you guys to ponder......mostly Elso [joke]........

On the op-amp I/V stages, I pumped a 1.8 mA current into the input to cancel out the unipolar current the '1541 puts out. And that current was servo controlled.

Jocko
Jocko, Not funny.
I know what's in your board. I will not spread the knowledge.
I have enough of pesting other forummembers!
I have enough of this hobby. Did throw my DAC against the wall. Bang, what a bad sound!!!
END OF STORY->
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Old 17th May 2003, 09:27 AM   #47
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Cheer up, Elso ! There are more things in life than audio.
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Old 17th May 2003, 10:03 AM   #48
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Talking elso

keep it up.......a nice burgundy might help....
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Old 17th May 2003, 11:30 AM   #49
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Default Gee, it was only a joke.............

Too bad you didn't think so.

And I know that you do not know about this board that I am refering to: none were ever sold in Europe.

Repeat: The dealers did not like the sound of CFB op-amps as I/V stages. It died a quick death. Or the company would have.

Anyway.....for the rest of you........Thorsten are you listening........the "and" part should be obvious.

If you think about it long enough.

Jocko
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Old 17th May 2003, 12:53 PM   #50
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Please give us the schematic Jocko. We really can't wait another year

Quote:
And I know that you do not know about this board that I am refering to: none were ever sold in Europe.
I don't think this prevents information to be exchanged around the globe. You would be surprised what amount of ( handdrawn ) schematics float around on the web, but never the one I am looking for at that moment
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