Best and final TDA1541A output stage - diyAudio
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View Poll Results: What's the best output stage for TDA1541A based DAC
Opamp 11 18.03%
Discrete Solid State 19 31.15%
Lampizator-style 10 16.39%
Cathode Follower 1 1.64%
Thorsten-style 8 13.11%
Other 12 19.67%
Voters: 61. You may not vote on this poll

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Old 1st June 2010, 07:19 PM   #1
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Default Best and final TDA1541A output stage

I will start building my first 1541-based DAC soon, based on the currently running GB from dvd-project.

I am still very much in doubt though on the ideal output stage for the tda 1541A (esp. with 2 dac chips). I quick google gives sooo many options I got lost...

Let's make a poll on the view of the community!
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Old 2nd June 2010, 12:24 PM   #2
oshifis is offline oshifis  Hungary
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Thorsten Loesch's "Adagio" comes from Audio Note DAC and it is very similar to the "Lampizator", so...?
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Old 2nd June 2010, 01:38 PM   #3
Sandor is offline Sandor  Italy
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Thorsten's Adagio uses a 20 ohm I/V resistor, a step-up transformer and a SRPP gain stage (E182CC).
The last published Thorsten's circuit has a 50 ohm I/V resistor, a choke loaded common cathode stage (ECC88), and no transformer.
The Lampizator uses a 100 ohm I/V resistor, a SRPP with a high gain tube (6N2P), and no transformer.

You could include in the list the good, and popular, "less simple I/V" from Rudolf Broertjies, as well as the Joko Homo's and Pedja Rogic's circuits.

I have tried all the above circuits and the best to me is the Adagio.
Regards.

Paul
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Old 2nd June 2010, 02:08 PM   #4
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Quote:
You could include in the list the good, and popular, "less simple I/V" from Rudolf Broertjies, as well as the Joko Homo's and Pedja Rogic's circuits.
I don't think I still can. Maybe a moderator can include these in the poll?
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Old 19th July 2010, 08:31 PM   #5
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Alright... I hoped this poll would be more conclusive.
Lampizator seems definately out.

Remaining are Thorsten, discrete and 'other'....
Are there any qualification as to what discrete sounds like vs. tube? (e.g. clearer, softer, more bass, etc?)
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Old 19th July 2010, 11:40 PM   #6
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I did vote for OpAmp. A decent OpAmp will have signal/noise, distortion way smaller than TDA's own. And there are fast enough OpAmps out there for the I/V stage (even for 4x OS).
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Old 20th July 2010, 12:38 AM   #7
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how about just a resistor and step-up transformer? then if you need gain, add a triode.
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Old 20th July 2010, 04:13 AM   #8
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The resistor can have bigger noise factor than an OpAmp input. DAC current output might not be loaded correctly by a resistor - OpAmps give zero impedance for an I/V stage.
Transformer has less bandwidth (lower end) than an OpAmp. And more, more distortion (hysteresis anyone?).
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Old 20th July 2010, 06:37 AM   #9
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yes, opamps may measure better, but they certainly wont sound better than a resistor and transformer.
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Old 20th July 2010, 12:03 PM   #10
qusp is offline qusp  Australia
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I dont know about that, I love iron as well, but you have to spend some serious money on output transformers to beat a good opamp circuit for IV. I generally prefer discrete SS and thats how I voted, it can measure right up there too, much better than trannies. I do like the simplicity of transformer output, but there is no denying the numbers are usually pretty bad and its not suitable for all dacs either IMO
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