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O2 AMP + ODAC - Page 138

post #2056 of 5248
Quote:
Originally Posted by RAZRr1275 View Post
 

Are there any pretty cheap solutions for the ODACs power supply issues?


What are they (issues)?

post #2057 of 5248
Quote:
Originally Posted by BenF View Post
 


What are they (issues)?

From what I've read, the fact that it uses USB power instead of a cleaner power supply method means that it's not using the fantastic Sabre chip to its full potential

post #2058 of 5248
Quote:
Originally Posted by RAZRr1275 View Post
 

From what I've read, the fact that it uses USB power instead of a cleaner power supply method means that it's not using the fantastic Sabre chip to its full potential

 

Try a USB Isolator:

http://hifimediy.com/index.php?route=product/product&path=60&product_id=122

post #2059 of 5248
Quote:
Originally Posted by BenF View Post
 

 

Try a USB Isolator:

http://hifimediy.com/index.php?route=product/product&path=60&product_id=122

Hm - does that essentially turn the computers usb power output into a powered USB hub?

post #2060 of 5248
Quote:
Originally Posted by RAZRr1275 View Post
 

Hm - does that essentially turn the computers usb power output into a powered USB hub?


It's not a hub and it doesn't take any external power.

post #2061 of 5248
Quote:
Originally Posted by BenF View Post
 


It's not a hub and it doesn't take any external power.

I meant that in the sense of does it clean up the power that the computer gives to the ODAC?

post #2062 of 5248
Quote:
Originally Posted by RAZRr1275 View Post
 

I meant that in the sense of does it clean up the power that the computer gives to the ODAC?


Supposedly.

I didn't hear any difference, but maybe my laptop's USB power is clean enough as it is.

post #2063 of 5248
Quote:
Originally Posted by BenF View Post
 


Supposedly.

I didn't hear any difference, but maybe my laptop's USB power is clean enough as it is.

As far as I know /have read, the ODAC has it's own power regulator but is not as efficient as people would want it.

 

If you're interested on a DIY alternative there's a project over in the DIY section called doodlebug, which is designed to not only isolate signal and power, but also include its own "externally-powered, linear-regulated" power supply.

 

This essentially means I intend to use DIY, AND DIY modding to improve my Objective stack :p.

 

Once again, when I get my hands on a doodlebug PCB and get it working, I'll let you guys know.

post #2064 of 5248
Quote:
Originally Posted by JacobLee89 View Post
 

As far as I know /have read, the ODAC has it's own power regulator but is not as efficient as people would want it.

 

If you're interested on a DIY alternative there's a project over in the DIY section called doodlebug, which is designed to not only isolate signal and power, but also include its own "externally-powered, linear-regulated" power supply.

 

This essentially means I intend to use DIY, AND DIY modding to improve my Objective stack :p.

 

Once again, when I get my hands on a doodlebug PCB and get it working, I'll let you guys know.

Well if you find sonic benefits let me know as I might want you to do it to my ODAC. I'm not diy savvy myself

post #2065 of 5248

Just wanted to say thanks to tomb and agdr for the interesting discussion of slew rates.  

 

Out of curiosity, does anyone know what the slew rate is on the wire?  Is Robaroni's post referencing 22V/us for the stock build correct (http://www.diyaudio.com/forums/headphone-systems/208709-using-ha-5002-instead-lme49600-wire-2.html )? 

post #2066 of 5248

For you guys that think that the O2 will "work better or sound better???" on el crapo PC usb 5 volts I have used the ODAC on over 20 pcs of all types and flavors. I also used and external very high dollar DC power supply and I could not hear any real audible differences.

 

All the measurements that the designer took and are published on the other site meet or exceed anything that might cause the loss of transparency etc or the ability of it to do what it was intended to that is to be a excellent digital to analog convertor.

 

The ODAC like the O2 was and still is an experiment to prove to the world that great audio can be had at less than astronomical prices....

 

Unless you really have a really poor PC USB implementation and violate the USB specs there should be no real world difference in what the ODAC does.

 

You can easily splice pure DC to power the ODAC to see what "pure DC" will do.....simple DC batteries have no AC ripple or warts...even mega buck AC to DC power supplies have issues....

 

All the best

A.

post #2067 of 5248

I tested a simple regulated power source with an ODAC and found the complete opposite. A good clean source made a noticeable difference, so much so i built an dedicated power supply / isolator for it. A good power supply is key to any good piece of audio hardware.

post #2068 of 5248
Quote:
Originally Posted by mcandmar View Post
 

I tested a simple regulated power source with an ODAC and found the complete opposite. A good clean source made a noticeable difference, so much so i built an dedicated power supply / isolator for it. A good power supply is key to any good piece of audio hardware.

 

I understand that the power supply is critical in a design of an audio amplifier. For instance, I think having a separate power circuit, including a separate ground, for the analog and digital parts of the system, is a good feature to have. And having a each power rail separately regulated is another important feature.  There must be other tricks involved with providing a clean power source. I am trying to remember things from over 30 years ago.

 

What are other features of a good, clean power source?

 

Bob Graham


Edited by r010159 - 2/24/14 at 6:45pm
post #2069 of 5248
Quote:
Originally Posted by adydula View Post
 

For you guys that think that the O2 will "work better or sound better???" on el crapo PC usb 5 volts I have used the ODAC on over 20 pcs of all types and flavors. I also used and external very high dollar DC power supply and I could not hear any real audible differences.

 

[snip]

 

All the best

A.

 

I believe you. But perhaps the power being provided to the power circuit of the ODAC is relatively clean? For that matter, back in time, I remember coming across some poor PC power supplies. I came across a few power supplies on PCs that were not up to spec or even failed.  This was not that uncommon. But maybe that is not the case anymore, particularly with the better makes of computers?

 

Bob Graham

post #2070 of 5248

Objective2 Amplifier + ODAC Illustrated Write-up

 

http://diy.koenigs.dk/2014/02/21/o2odac-amplifier-and-dac/

 

 

 

 


Edited by lokesen - 2/25/14 at 2:42am
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