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Old 1st October 2004, 07:17 PM   #1
GerryM is offline GerryM  Norway
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Default Passive I/V Solutions Database?

Seems like a lot of people out there are cooking up passive I/V solutions, but we don't have a central place to send in our experiences and what the final configuration was.
Wouldnt it be great if we could just look up the tried and tested solutions instead of reinventing the wheel all the time and asking the same questions?
At least it would be a good starting point.

Things like CD Player model, DAC type, configuration (parallel/diff/..), resistor value, resistor type(Vishay Draloric/Dale/Caddock/...), Transformer data (make/ratio/part nr/...), Interconnect type (balanced/SE/ Length...),Preamp/amp input impedance, and not least how it sounds!

Any interest? How can we do this???
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Old 1st October 2004, 07:36 PM   #2
niles is offline niles  United States
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Default How about active I/V's too?

Since we are wishing, it would be nice to have a central repository for schematics, measurements and design objectives-limitations for discrete I/V topologies for both balanced current output DACs and single ended voltage and current output DACS.

Perhaps, dare I say, even some monolithic IC based I/V designs for beginers and those with less ambition and even some x-former coupled designs for the freaks (maybe even with tooobs for the humourless reactionaries).

A page on the WIKI is a natural suggestion for such a project. Gentlemen, shall we begin?
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Old 1st October 2004, 07:41 PM   #3
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only ready tested designs or also proposals for diskussion?

http://www.diyaudio.com/forums/showt...472#post481472
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Old 1st October 2004, 08:01 PM   #4
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Default Re: Passive I/V Solutions Database?

Quote:
Originally posted by GerryM
Seems like a lot of people out there are cooking up passive I/V solutions, but we don't have a central place to send in our experiences and what the final configuration was.
Wouldnt it be great if we could just look up the tried and tested solutions instead of reinventing the wheel all the time and asking the same questions?
At least it would be a good starting point.

Things like CD Player model, DAC type, configuration (parallel/diff/..), resistor value, resistor type(Vishay Draloric/Dale/Caddock/...), Transformer data (make/ratio/part nr/...), Interconnect type (balanced/SE/ Length...),Preamp/amp input impedance, and not least how it sounds!

Any interest? How can we do this???

You can't. There are simply too many combinations.
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Old 1st October 2004, 08:12 PM   #5
GerryM is offline GerryM  Norway
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This is a challenge, not a problem and it is not impossible.

If we broke it down starting with the DAC chip type and then sub-categories, I don't think it would be too much...
Or maybe starting categories such as I/V out 1-2 mA, 2-4mA.. Vout xV - yV and so on...
I see the same questions over and over and over again..

I want to see a bunch of implemented solutions I can look at and evaluate, in an organised manner, not the mish-mash of half-info and 'in' debates from a few insiders that you find on audioasylum and this forum.

This is not rocket science if we just come up with the right set of categories and sub categories...
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Old 1st October 2004, 10:44 PM   #6
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Of course it is not impossible. In the same way it is not impossible to walk from Le Harve to Vladivostok. Still, I look forward seeing the GerryM PassiveIV ReadyReckoner.
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Old 1st October 2004, 11:01 PM   #7
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Cool IV

Horowitz lists three options for IV conversion for DACs with current outputs. See page 617 in the second edition.
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Old 1st October 2004, 11:46 PM   #8
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Default Re: IV

Quote:
Originally posted by Elso Kwak
Horowitz lists three options for IV conversion for DACs with current outputs. See page 617 in the second edition.
Thats all well and good but do either of the H's say what they sound like?
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Old 2nd October 2004, 04:47 AM   #9
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Default You forgot one parameter......

Distortion. It varies from DAC to DAC with different values of loading > 0 ohms.

Jocko
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Old 2nd October 2004, 08:00 AM   #10
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Cool Re: You forgot one parameter......

Quote:
Originally posted by Jocko Homo
Distortion. It varies from DAC to DAC with different values of loading > 0 ohms.

Jocko
Right, DACs have different "compliance", hence it does sound different. Experiment.
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