Any good TDA1541A DAC kit? - Page 23 - diyAudio
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Old 21st January 2012, 02:20 AM   #221
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Because that would prove that OpAmps cannot work in a TDA1541A????
I do own a CD made by the same company that made TDA1541. And they used... gasp... OpAmps as I/V converter. LM833 with a typical SR of 7V/us, 4.5nV/sqrt Hz, THD 0.002%. Higher end models used OpAmps like NJM2114 - SR 15v/uS, 3.3nV/sqrt Hz, THD 0.0005%

Last edited by SoNic_real_one; 21st January 2012 at 02:32 AM.
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Old 21st January 2012, 02:23 AM   #222
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Obviously not a design choice based on sound quality.
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Old 21st January 2012, 02:32 AM   #223
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Of course, because they didn't have a clue what they are doing. That DAC fell off the sky in their lap.

I don't say it was perfect, they added a capacitor in feedback to limit the slew, exactly because they knew what could be done.
What I say is that TODAY, OpAmps are so much better than 20 years ago. And they are the only good option for a proper I/V stage that keeps in check the distortion AND the noise.
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Old 21st January 2012, 02:33 AM   #224
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Quote:
Originally Posted by SoNic_real_one View Post
Because that would prove that OpAmps cannot work in a TDA1541A????
I do own a CD made by the same company that made TDA1541. And they used... gasp... OpAmps as I/V converter. LM833 with a typical SR of 7V/us, 4.5nV/sqrt Hz, THD 0.002%. Higher end models used OpAmps like NJM2114 - SR 15v/uS, 3.3nV/sqrt Hz, THD 0.0005%
So then what is your DAC of choice ?
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Old 21st January 2012, 02:40 AM   #225
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A nice delta-sigma :P

Or in the multibit world, BB DAC's. True R-2R. I have two PCM61 (each with 2 extra bits added in analog mode) in a Denon DCM380 than sounds better than Philips CD473 with TDA1541. Both with LM4562 in the I/V stage.

Last edited by SoNic_real_one; 21st January 2012 at 02:42 AM.
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Old 21st January 2012, 02:51 AM   #226
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Quote:
Originally Posted by SoNic_real_one View Post
Or in the multibit world, BB DAC's. True R-2R.
What's the big attraction about R-2R? The INL perchance?

Quote:
I have two PCM61 (each with 2 extra bits added in analog mode) in a Denon DCM380 than sounds better than Philips CD473 with TDA1541. Both with LM4562 in the I/V stage.
Ah, no wonder your 1541 sounds poor
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Old 21st January 2012, 02:56 AM   #227
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Quote:
Originally Posted by SoNic_real_one View Post
And they are the only good option for a proper I/V stage that keeps in check the distortion AND the noise.
That might be because you're only measuring THD, and full level THD at that. IMD is also distortion - that's what the 'D' stands for. Got any clue about the IMD when an opamp is used?
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Old 21st January 2012, 03:42 AM   #228
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And have you got any clue how to do I to V with the resistor handling 2mA of DAC output current swing, filtering duties, with 2 V output requirements at RCA? Enlighten us on how to avoid IMD… and pls state the THD of you approach – so that we can compare OP solution with your solution.

Boky
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Old 21st January 2012, 03:56 AM   #229
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Originally Posted by ThorstenL View Post
Hi,


In the end this distortion was acknowledged to exist in the design, even though it could not be measured. Essentially it was a specific case of TIM/SID.


Ciao T
Is this a joke? Can't be measured? Ha,ha,ha...

Boky
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Old 21st January 2012, 04:15 AM   #230
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Originally Posted by SoNic_real_one View Post
A nice delta-sigma :P

Or in the multibit world, BB DAC's. True R-2R. I have two PCM61 (each with 2 extra bits added in analog mode) in a Denon DCM380 than sounds better than Philips CD473 with TDA1541. Both with LM4562 in the I/V stage.
I am sure my old Sony CDP 337 ESD would put that player in its place of course it has dual TDA1541A DAC's and discrete output

BB DAC's measure well but lack dynamics and do not have the magic compared to TDA1541A DAC's you should take the time to listen to a well sorted TDA1541A DAC and then pass judgment and not just go off measurements you will get farther instead of relying on assumptions

Isn't a Denon DCM380 a carousel player ?

Last edited by paul_peraic; 21st January 2012 at 04:19 AM.
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