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Old 21st May 2012, 12:41 PM   #831
heb1001 is offline heb1001  China
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Quote:
Originally Posted by steel monkey View Post
EUVL, thanks for sharing this truly amazing and elegant idea!.
Yeah, have to second this.

I sorted out the circuit grounding and shield grounding yesterday and it's taken the sound to a new level completely.

Listening test is unquestionably better than my op-amp IV and the measurements are getting there too now.

I'm guessing I'm hearing the sound of my tube amp for the first time.
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Old 21st May 2012, 05:06 PM   #832
EUVL is offline EUVL  Europe
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> Listening test is unquestionably better than my op-amp IV

That I almost consider an insult.

Nic will tell you how many other discrete IV's it has beaten, even in its box standard form.
And without any magics (like Blackgate NX, Vishay Naked, ...., etc.)

And thanks to the generosity of Jan Didden, you can now even download the article for free.
What more can you ask for !


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Old 21st May 2012, 09:53 PM   #833
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EUVL, couldn`t you recommend reconstruction filter to you circuit?
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Old 21st May 2012, 10:38 PM   #834
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Matter of taste.
I personally like simple filters.


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Old 22nd May 2012, 03:35 AM   #835
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As long as you get no aliasing products.......
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Old 22nd May 2012, 04:51 AM   #836
EUVL is offline EUVL  Europe
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What would you prefer as a filter ?


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Old 22nd May 2012, 05:19 AM   #837
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input is output... flip-flop
honest, that has being beaten to death
the current fave is a filter that puts the pre ringing into the post ringing
the apodizing filter.
of cause that is a digital filter and not an analog.
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Old 22nd May 2012, 07:45 AM   #838
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input is output... flip-flop
honest, that has being beaten to death

??!
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Old 22nd May 2012, 08:16 AM   #839
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When the AD converter does not alias a linear phase filter is the correct way when you want " transparent". When you measure that DA converter ( with a linear phase filter ) it will have pre and post ringing, symmetrically aligned, but you will not hear it.
When the AD has aliasing products that can be an audible because sound will appear "before" it it causal.
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Old 22nd May 2012, 09:43 AM   #840
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Sorry Joachim if I've got this wrong, but from the above ...

This means that a D->A converter produces pre and post ringing, and you can't hear it, but you can measure it with a linear phase filter, yes?

So why do you need any filters at all, to get rid of something that you can't hear? Or is this something to do with transparency?
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