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Old 5th December 2007, 08:01 PM   #1
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Default Discrete Dual Differential DAC?

EMM Labs claims to have
Quote:
the world’s first and only discrete dual differential D-to-A conversion circuit.
Is this claim true?

Regards,
Dan
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Old 5th December 2007, 08:08 PM   #2
fizzard is offline fizzard  Canada
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It's the first I've heard, at least in the audio realm.

I interpret "dual differential" as one per polarity per channel, or four DACs. Really all a DSD DAC is an RC filter, so this isn't a huge breakthrough.

The only discrete audio DAC I know of is a little dated by todays standards, and was of the one-DAC-per channel variety with S/H.
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Old 5th December 2007, 08:37 PM   #3
Gasho is offline Gasho  Croatia
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Discrette DAC circuit can or can´t be better solution than integrated ciruit. It is more expensive way. longer traces, component selection, temperature stability are problem that must be solved.

Arcam, Spectral, Audio Syntesist allready go discrette. Ultra Analog and Anagram produced discrette DACs in big chips which are encapsulated discrette DACs.
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Old 5th December 2007, 08:42 PM   #4
OliverD is offline OliverD  Germany
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The first generations of Accuphase digital gear all had discrete DACs...
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Old 6th December 2007, 01:41 AM   #5
JohnW is offline JohnW  Hong Kong
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I believe the Pink Triangle Dacapo was the worlds first commercial 1 Bit Discrete Dual Differential DAC; I designed the original version in 1990 - 1991.

The EMM Labs DAC rate is claimed to be 128Fs – Even back in 1990 – 91 the Dacapo Discrete DAC’s operated at 3 times this rate @ 384Fs

Discrete Dual Differential DAC is old news. The latest Dacapo DAC (to be launched Q1 next year) has 16x "Discrete Dual Differential DAC's" per channel, making a total of 64 DAC elements per channel – 128 DAC’s per stereo unit!

JohnW
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Old 6th December 2007, 05:55 AM   #6
oshifis is offline oshifis  Hungary
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Not dual and not commercial (still in development phase, but works):

http://www.freeweb.hu/tube/DDAC.pdf
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Old 6th December 2007, 06:24 AM   #7
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Quote:
Originally posted by JohnW
The latest Dacapo DAC (to be launched Q1 next year) has 16x "Discrete Dual Differential DAC's" per channel, making a total of 64 DAC elements per channel – 128 DAC’s per stereo unit!
Hi John,

Could you define Q1 next year for as not familiar with this english term?

Also, have you received my mail sent thru diyaudio about S700 Isomagic service manual?

Ivo
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Old 6th December 2007, 08:41 AM   #8
JohnW is offline JohnW  Hong Kong
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Hi Ivo,

"Q1" Means first quarter next year (which in reality is always toward the end of the quarter)...

Sorry - I do recall receiving a request recently for the Schematics for IsoMagic - however it was design more then 10 years ago - and I no longer have them to hand (many changes of PC and crashed HDD's since).

If I do stumble across them, I will forward to you.

John
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Old 6th December 2007, 09:32 AM   #9
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Quote:
Originally posted by JohnW


Sorry - I do recall receiving a request recently for the Schematics for IsoMagic - however it was design more then 10 years ago - and I no longer have them to hand (many changes of PC and crashed HDD's since).

If I do stumble across them, I will forward to you.

I know you don' have them John...but I was about to send you one (not the best copy, bur anyway), thanks to nice gay from Cambridge Audio (customer care manager).

And gays, if and when I get a clearance from John, I will upload a manual somewhere.

Ivo
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Old 6th December 2007, 09:42 AM   #10
oshifis is offline oshifis  Hungary
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Quote:
Originally posted by aparatusonitus
And gays...
Me not...
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