A NOS 192/24 DAC with the PCM1794 (and WaveIO USB input) - Page 28 - diyAudio
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Old 1st April 2013, 04:29 PM   #271
Tinco is offline Tinco  Netherlands
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Quote:
Originally Posted by dddac View Post
The idea is not bad and as it is generic ( every dac could work with this) you could make an own thread of it. lets stick here now on the DAC. I know how quickly we can get off topic
Hey Doede, that's true, made a thread here: www.diyaudio.com/forums/digital-line-level/233230-raspberry-pi-i2s-output-asynchronous-usb-i2s.html
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Old 1st April 2013, 04:34 PM   #272
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Sorry for error when uploading images.
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Old 1st April 2013, 05:06 PM   #273
AudioH is offline AudioH  United Kingdom
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Default Finished (nearly) DDDAC

Hi All,

here are some photos of my DDDAC with LCD display showing the WaveIO status. Still sounding wonderful.

The WaveIO and Teensy/LCD are powered from a 7v wall socket SMPS via independent 5v regulators so room for improvement here. The drain on the lead acid was too great surprisingly. Perhaps my battery is not in top condition.

I am considering replacing the lead acid battery with lifepo4 ones. Has anyone any experience using these please ?

Regards.
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Old 2nd April 2013, 05:04 AM   #274
bravi is offline bravi  New Zealand
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Default My 4 deck build picture

Hi All,

Photo of my test bench version described in post 229

Description of sound quality follows.

Cheers!
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Old 2nd April 2013, 05:22 AM   #275
bravi is offline bravi  New Zealand
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Default Sound quality - single versus 4 deck

The first test was done with a motherboard with one deck only with Power supply as described earlier. Listening was via headphone (AKG 702) driven by Schiit Lyr headphone amp

In comparison to my other DAC ( Asus ) the difference was an improvement in the timing and tempo of music. There was some improvement in resolution, but the ASUS had a slightly greater weight.

4 Deck version - What a huge improvement! The lower end has greater weight and more importantly the resolution was just amazing. Listening to jazz ( Barbara Cartland at Birdland was the test disc), the piano sounded as if I was just a few feet from the instrument. Ambience retrieval in this live recording was just great. One of the aspects that demonstrates the resolving power is the fact that handclaps could be localised amongst the audience as well as the differences in how clapping sounds when different people are clapping. When listening to this CD with my CD player or through the ASUS,
I could guess the people were eating in the venue as I could make out the clink of cutlery. Through DDAC (4 deck) this resolved as the sound of a fork(?) being placed on a plate, the distinct sound we are familiar with at the dinner table.

An Appeal: Doede or anyone else, can you please advise if the 8 deck version improves on the 4 decks as significantly? I need to house this project; cant be done without deciding on the final configuration.

Lastly, am I glad that I chose this DAC. Now I can say that digital playback has a good standing to vinyl and open reel tape in my set up.

Cheers!

Ravi
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Old 2nd April 2013, 10:32 AM   #276
tuyen is offline tuyen  Australia
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awesome tip regarding the caps, Supersurfer. Thanks!!

nice review guys.. guess it is time to order 3 more boards...
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Old 2nd April 2013, 05:39 PM   #277
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Quote:
Originally Posted by bravi View Post
Hi All,

Photo of my test bench version described in post 229

Description of sound quality follows.

Cheers!
Cool choke loaded power supply! Have you compaired with the stock power supply design?

I recieved some Salas shunt supply boards today, will try them when the 4 dac boards and sowters are installed and burned in.

@tuyen: please report your findings if you try out the cap modification.

Regards,
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Old 2nd April 2013, 08:11 PM   #278
bravi is offline bravi  New Zealand
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Default Choke loaded supply

Hi Supersurfer,

I am a bit of a tube dinosaur. Hence went with choke loaded version to start with as I had the appropriate chokes in my bin.Hence no chance to compare power supplies. Other reasons for taking this path include minimising noise from rectification process which is difficult to get rid in subsequent stages. This is compounded with the high level of rfi noise in the environment these days.

If you do not mind the bulk and have access to chokes I would recommend taking this route.

Cheers!

Ravi
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Old 2nd April 2013, 08:24 PM   #279
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Quote:
Originally Posted by bravi View Post
Hi Supersurfer,

I am a bit of a tube dinosaur. Hence went with choke loaded version to start with as I had the appropriate chokes in my bin.Hence no chance to compare power supplies. Other reasons for taking this path include minimising noise from rectification process which is difficult to get rid in subsequent stages. This is compounded with the high level of rfi noise in the environment these days.

If you do not mind the bulk and have access to chokes I would recommend taking this route.

Cheers!

Ravi
Hi Ravi,

I know from experience that chokes and the right tube rectifiers can make a lot of difference, I use 4 chokes a channell in my amps.

But my amps have unregulated supplys so I was wondering how much of the choke effect would penetrate through the power regulation.

I was wondering what the sound difference would be, if it makes a significant difference I would try it out.

I would certainly try some shottky diodes in the regulators........

Gerards,
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Old 2nd April 2013, 11:02 PM   #280
tuyen is offline tuyen  Australia
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Curious to know subjective differences in sound running choke loaded psu / tube rectified psu compares to the standard psu kit offered by Doede? Also Supersurfer, noticed you are using pair of red black gates on the psu instead of the nichicons. Much diff?

Cheers
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