Discrete Dual Differential DAC? - Page 2

abzug · 6th December 2007, 11:22 AM

Quote:

Originally posted by oshifis
Not dual and not commercial (still in development phase, but works):

http://www.freeweb.hu/tube/DDAC.pdf

How much of an issues is glitch energy in this design?

analog_sa · 6th December 2007, 01:35 PM

Quote:

Originally posted by oshifis
Me not...

No manual for you then.

stephensank · 6th December 2007, 06:15 PM

Ed Meitner's is a DSD discrete dac, which is a quite different animal to any form of PCM dac, one-bit or otherwise.
Anyone who has ever heard a Meitner Museatex BiDAT dac will be extremely interested to here this unit, as am I.

oshifis · 7th December 2007, 07:23 AM

Quote:

Originally posted by abzug

How much of an issues is glitch energy in this design?

Glitch causes the same problem as jitter: it spoils the signal amplitude. The glitch has most effect on the MSB. A fast and precise S/H circuit could be the solution, but that part has not been worked out yet. I used the conventional op-amp output in the prototype without S/H, because I just wanted to test the concept of the digital and D/A part. The tube output on the circuit diagram is imaginary, all the other parts is actually working.

I think the "8 MSB trimming" idea could be used with a TDA1541A, as well. The current dividers are accessible at the ripple rejection capacitor pins... I need to check this.

abzug · 18th December 2007, 04:53 AM

Dan Lavry has a discrete 24-bit R2R DAC which is recalibrated at every power-on. But modern sigma-delta DAC ICs outperform it. It seems to me ladders are obsolete tech. My question is, how to DIY sigma-delta... I know it's possible, because Bruno Putzeys has a discrete DSD A/D module.

svanschalkwyk · 3rd March 2011, 02:43 AM

Quote:

Originally Posted by aparatusonitus

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

Anything on the ISOMAGIC circuit diagram? Mine is missing one channel...

aparatusonitus · 3rd March 2011, 10:19 AM

Well, I still don't have clearance from John, but he would not mind, I think...not after all these years. Send me your email address via forums pm.

svanschalkwyk · 3rd March 2011, 02:22 PM

Thanks very much!
My email is
Step (at) remcam (dot) net
Much appreciated!
Step

EUVL · 5th March 2011, 07:24 AM

Would very much appreciate a copy as well.
You can email me via the forum.

Many thanks,
Patrick

3rd March 2011, 10:19 AM	#17
aparatusonitus diyAudio Member Join Date: Jan 2004 Location: Split, Croatia	Well, I still don't have clearance from John, but he would not mind, I think...not after all these years. Send me your email address via forums pm. __________________ Non é mai abbastanza...

3rd March 2011, 02:22 PM	#18
svanschalkwyk diyAudio Member Join Date: Aug 2007	Isomagic Thanks very much! My email is Step (at) remcam (dot) net Much appreciated! Step

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6th December 2007, 06:15 PM	#13
stephensank diyAudio Member Join Date: Oct 2006	Ed Meitner's is a DSD discrete dac, which is a quite different animal to any form of PCM dac, one-bit or otherwise. Anyone who has ever heard a Meitner Museatex BiDAT dac will be extremely interested to here this unit, as am I.

18th December 2007, 04:53 AM	#15
abzug Account Disabled Join Date: Jan 2006 Location: whereisit	Dan Lavry has a discrete 24-bit R2R DAC which is recalibrated at every power-on. But modern sigma-delta DAC ICs outperform it. It seems to me ladders are obsolete tech. My question is, how to DIY sigma-delta... I know it's possible, because Bruno Putzeys has a discrete DSD A/D module.

5th March 2011, 07:24 AM	#19
EUVL diyAudio Member Join Date: Oct 2003	Would very much appreciate a copy as well. You can email me via the forum. Many thanks, Patrick

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