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Old 13th July 2009, 02:10 AM   #1
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Default About discrete I/V stage circuits for a TDA1541A dac

Hello

I was first thinking about using op-amp or tube for a I/V stage for a TDA1541A dac, but after reading about the op-amps subject and because of some of my limitations with tubes, I decided to go for a discrete I/V stage.

Searching on the net and in the Diyaudio and Diyhifi forums I found four circuits.

But I did not found the distortions figures for those circuits, some are from members of this forum, anybody would know the distortions figures of those circuits ?

Any one can tell any comparaisons or listening experiences on any of those four circuits ?

I've place all of them in one image.

Thank you

Bye

Gaetan
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File Type: gif tda1541a all iv stages.gif (59.5 KB, 766 views)
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Old 13th July 2009, 04:53 AM   #2
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I'm using AD844 in configuration as in image C, the only difference is that I also use AD844 output diamond buffer. With the little fielding with 200R trimmer, you can have DC coupled output, but output offset will wary from -30mV to zero from startup (in my case). Sound is very, very good.
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Old 13th July 2009, 05:13 AM   #3
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Quote:
Originally posted by aparatusonitus
I'm using AD844 in configuration as in image C, the only difference is that I also use AD844 output diamond buffer. With the little fielding with 200R trimmer, you can have DC coupled output, but output offset will wary from -30mV to zero from startup (in my case). Sound is very, very good.

Hello

That is the one design by Pedja Rogic.

I do not have fet but maby I can find some on old pc board, does it need to be this fet or any similar one will do ?

You use it in a OS or NOS TDA1541A dac ?

Thank you

Bye

GAetan
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Old 13th July 2009, 05:23 AM   #4
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Yes, mine is nonos design, and you can use any similar J-fet (I'm using an 2N4393).
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Old 14th July 2009, 03:30 AM   #5
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Hello

I have found a low pass filter sim by Zodiac in 2003.

Maby I could use this filter with the Pedja Rogic I/V stage circuits (image C) ?

Here is the image of the filter circuit and of the frequency and phase response.

Thank

Bye

Gaetan
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Old 11th December 2010, 07:28 PM   #6
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Sorry for this megabump, but I can't find the reference to schematic C above.
I wil try this stage for my dac, but can somebody confirm whether there are two +19V and one +15V supply lines here?

Or is it one +19V, one -19V and one +15V?

Thanks
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