Best opamp for I/V conversion? (DAC) - Page 24

tvicol · 12th May 2009, 11:32 AM

LME49713 is a very good choice in this regard.

Regards,
Tibi

QSerraTico_Tico · 15th May 2009, 10:09 AM

it depends on the DAC chip used

Zoran · 15th May 2009, 01:51 PM

Tolu, I put some sch with 861 AD, for Ibuffer, and tube out at the EC-design topic,
but I dont know on which page..? i tryed... pages around 100... I think
sorry

Zoran · 15th May 2009, 01:53 PM

or transistor OP versions,
google for Sonic Sculptor
Cheers

pifski · 20th June 2009, 04:37 PM

Hello,
I'm modding Musical Fidelity V-Dac and have AD OP467 and National LME49740. Who is better choice for I/V conversion.

Regards

hafp · 20th June 2009, 05:19 PM

"The output stage is 4 x NE 5534 and after which the DC block by 2 x 10uF Solen Fast Cap"

ccschua,
You will get a big improvement by changing the 10uf solens to a better film cap; sonicaps or the more expansive sonicaps will sound much better if you are going to stay with that current oputput configuration.

Cheers.

foo · 20th June 2009, 07:22 PM

IMO, the easiest way to get good sound is to use OPA627BM or OPA627SM as I/V.
I won't say they are the best.
But they are easy to get, easy to use, and especially easy to sound good.

I think one can simply apply these OPA627s and spend more time thinking about other improvements in a system.

tiefbassuebertr · 17th July 2009, 09:40 PM

a simple resistor is better as each OP-AMP that I know - please refer for the exactly value
http://www.dddac.de/pcm63/DAC_I-V_Resistor.htm
(easy to realize for check out the sound quality)

for ultimate sound quality you need the I/U converter from Papa Nelson Pass - please refer in this case therefore the follow URLs:
A nice dac to complement the Aleph-X.
http://calab.kaist.ac.kr/~cgkim/audi....com/d1_ua.htm
Anyone built a Pass D1 I/V for a TI1794 or TI1794 DAC?
http://www.head-fi.org/forums/f6/pas...ne-kit-324197/
http://www.head-case.org/forums/do-y...-d1-clone.html

Until this day I haven't discover an OP-Amp with similar sonic quality. For me it is amazing, that most of the hobby and commercial developers don't use this solution

sonnya · 17th July 2009, 09:48 PM

Well there is a reason why you should choose an active part with as little input impedance as possible. The current outputs from a dac is far from linear. They are only linear in a very narrow band.

But then again. This I/V converter can be made with current mirror and an output buffer with no feedback and the sonic performance will not suffer.... And in bonus you will get a far better performance than with resistors alone

Ask Jocko Homo if he still is arround here....

- Sonny

jean-paul · 17th July 2009, 09:58 PM

Jocko is not around here. He is busy at the other website.

15th May 2009, 01:51 PM	#233
Zoran diyAudio Member Join Date: Jan 2004 Location: Belgrade	Tolu, I put some sch with 861 AD, for Ibuffer, and tube out at the EC-design topic, but I dont know on which page..? i tryed... pages around 100... I think sorry __________________ ###

15th May 2009, 01:53 PM	#234
Zoran diyAudio Member Join Date: Jan 2004 Location: Belgrade	or transistor OP versions, google for Sonic Sculptor Cheers __________________ ###

17th July 2009, 09:58 PM	#240
jean-paul diyAudio Moderator Emeritus Join Date: Sep 2002 Location: The Netherlands	Jocko is not around here. He is busy at the other website. __________________ It's only audio

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12th May 2009, 11:32 AM	#231
tvicol vicol-audio.ro diyAudio Member Join Date: Jan 2005 Location: Bucharest	LME49713 is a very good choice in this regard. Regards, Tibi

15th May 2009, 10:09 AM	#232
QSerraTico_Tico diyAudio Member Join Date: Oct 2004	it depends on the DAC chip used

20th June 2009, 04:37 PM	#235
pifski diyAudio Member Join Date: Jun 2009	Hello, I'm modding Musical Fidelity V-Dac and have AD OP467 and National LME49740. Who is better choice for I/V conversion. Regards

20th June 2009, 05:19 PM	#236
hafp diyAudio Member Join Date: Feb 2008	"The output stage is 4 x NE 5534 and after which the DC block by 2 x 10uF Solen Fast Cap" ccschua, You will get a big improvement by changing the 10uf solens to a better film cap; sonicaps or the more expansive sonicaps will sound much better if you are going to stay with that current oputput configuration. Cheers.

20th June 2009, 07:22 PM	#237
foo diyAudio Member Join Date: May 2004 Location: ...	IMO, the easiest way to get good sound is to use OPA627BM or OPA627SM as I/V. I won't say they are the best. But they are easy to get, easy to use, and especially easy to sound good. I think one can simply apply these OPA627s and spend more time thinking about other improvements in a system.

17th July 2009, 09:40 PM	#238
tiefbassuebertr diyAudio Member Join Date: Jul 2005 Location: D-55629 Schwarzerden	a simple resistor is better as each OP-AMP that I know - please refer for the exactly value http://www.dddac.de/pcm63/DAC_I-V_Resistor.htm (easy to realize for check out the sound quality) for ultimate sound quality you need the I/U converter from Papa Nelson Pass - please refer in this case therefore the follow URLs: A nice dac to complement the Aleph-X. http://calab.kaist.ac.kr/~cgkim/audi....com/d1_ua.htm Anyone built a Pass D1 I/V for a TI1794 or TI1794 DAC? http://www.head-fi.org/forums/f6/pas...ne-kit-324197/ http://www.head-case.org/forums/do-y...-d1-clone.html Until this day I haven't discover an OP-Amp with similar sonic quality. For me it is amazing, that most of the hobby and commercial developers don't use this solution

17th July 2009, 09:48 PM	#239
sonnya diyAudio Member Join Date: Oct 2001 Location: Denmark	Well there is a reason why you should choose an active part with as little input impedance as possible. The current outputs from a dac is far from linear. They are only linear in a very narrow band. But then again. This I/V converter can be made with current mirror and an output buffer with no feedback and the sonic performance will not suffer.... And in bonus you will get a far better performance than with resistors alone Ask Jocko Homo if he still is arround here.... - Sonny

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