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Old 18th December 2008, 11:04 PM   #2381
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Remember that inevitably, the power to a PCI sound card will come from the same rails that power the rest of the motherboard, with all the noise that is injected by the other components. A USB DAC has the advantage of running from clean rails.

However, the USB standard isn't really designed for audio. The Firewire standard is far superior. I won't explain why here, as I'm sure you've had people preach about it to you before.

I was just wondering, Peter, if you'd considered developing a FireWire DAC? There are plenty of commercial products, but most are designed for recording and monitoring and are thus focused around the ADC section, and very few could be considered Hi-Fi designs.
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Old 18th December 2008, 11:13 PM   #2382
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I'm also under impression, that soundcard is a weak link in outputting signal from a computer; as bad as some try to picture USB, it has certain advantages, and it certainly shows in my current system.

I'd like to come up with firewire DAC, but I still don't know what chip to use, any recommendations?
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Old 18th December 2008, 11:18 PM   #2383
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Rick,

I'm checking this manual: http://photos.imageevent.com/cics/cm...r%20Manual.pdf
He still uses same CPU and Biostar Mobo, which is basiaclly same as previous version. Are there any other manuals?

Also, what's the best source for Juli@ card? I wouldn't mind trying it. My DAC does not accept higher formats, but I also have a different one that does, although I still can't get excited about it

I got some improvements after I finally disconnected SRC resampler few days back.
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Old 19th December 2008, 03:52 AM   #2384
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Default Perfect Attenuator

Quote:
Originally posted by Peter Daniel


Untill I am in position to secure reliable supply of display modules, I won't be offering that circuit as a kit. Presently, only PCBs and control chip are available. If you are able to source all the other parts yourself, you can complete that project.

The above was written some time ago presumably about the perfect attenuator. I am in need of attenuation! So of course this one is at the top of my list. Has the situation improved?
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Old 19th December 2008, 06:06 AM   #2385
leflu is offline leflu  Germany
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Hi,
im using the 120-WI-25 PICO and im feeding it with 15 Volts out of a
Notebook PSU. But i already planned to build an PSU on my own but originally
planned toroidcore transfo with msr and 10000 m elna silmic.
But maybe ill try your lt1083 psu.
Peter and could you please post a picture of your modded pico?

Greetings Ulf
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Old 19th December 2008, 08:41 AM   #2386
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I'm afraid I don't know of a simple solution. Since products exist, there is obviously a chip to do the job, but I'm afraid I don't have the spare funds to go purchasing Mark of the Unicorn gear just to see what chips are inside.

I know TI's TSB43CB43A can be used for the job, but it's about a million times more complex than a common USB-I2S chip like the PCM2707. The reason for that is that while USB devices are all slaves to the host (the computer) all Firewire devices are on equal footing, and as such, Firewire interface chips require an embedded micro-controller.

But still, if M-Audio and MotU and DigiDesign and whatnot can bring products to market for a few hundred dollars, it's got to be possible to create something, even if it is pricey.
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Old 19th December 2008, 03:06 PM   #2387
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Default JULI@ iis only used for SPDIF

My DAC is completely outboard and with a transformer input for galvanic isolation. There is no difference in audible noise with computer on or off. I do not have a scope so who knows what going on way up there. But with the clean high frequencies, and the fact that my amplifiers stay cool makes me think that the transformer is doing its job.

look here:
http://www.audioasylum.com/forums/pc...s/2/27041.html

and here:
http://www.audioasylum.com/forums/pc...s/3/31286.html

There is much that has happened since these threads were started.

It is true that the components on the MB would do much to spoil a perfect power supply but this is the case with almost anything.

I had asked Paul Hynes to come up with a shunt reg for a computer and when he gets time he is going to see what he can come up with. He is going to try out cMP and cPLAY but seems to be so dedicated to LP he is not terribly motivated to drop everything and DO IT. But, to get back on point something conceptually makes me think the shunt reg could maybe absorb some of the returned garbage unlike any other regulated approach. One would think a shunt reg for the 3.3 and 5 volts rails would be much easier to implement that one for the 12 volts rail which brings me back to thinking that a BIG batter would be best for this. Most power is required for the 12 volts rail.My idea was to use a power diode to give a little voltage reduction but then you would lose the give and take aspect. Of course, my concept could be completely ridiculous.

I would like to hear what others think.

There is much good in this and much more possible.
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Old 19th December 2008, 03:11 PM   #2388
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Default JULI@ source

Just search ESI JULI@ - I am sure there is someone in Canada stocking the thing.

What is neat about it is that you can remove all of the DAC stuff and then it is easy to add a small capacitor bank to clean up the DC.

I would look forward to hearing what you think of it
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Old 19th December 2008, 03:22 PM   #2389
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Hi Rick, thanks for the info.

I checked last night Asylum thread and you guys put a lot of work into that thing. I have some questions:

Is switching to GIGABYTE MB due to nonavailability of Biostar or because of better performance, if so, how much better?

How much improvement comes with E7200 comparing to previously used E2140?

How would you compare Memoery Player to playback directly from HDD?

And finally, what's the last word on RAM size and type?

I would be adding separate 5V supplies for mouse and HDD to see if there's any improvement here.
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Old 19th December 2008, 04:10 PM   #2390
r8833 is offline r8833  Canada
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Hi Peter,

Another software to try is XXhighend. I love the sound of this memory player.http://www.phasure.com/index.php..Im using the same Biostar MB , you just need to add more ram
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