A NOS 192/24 DAC with the PCM1794 (and WaveIO USB input) - Page 8 - diyAudio
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Old 19th December 2012, 04:28 PM   #71
clivem is offline clivem  United Kingdom
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Quote:
Originally Posted by BachAudioDK View Post
My comment on the 0.4% THD was more minded on, that this Chip (PCM1794) should be able to perform better even in NOS mode and with passive I/V.
Run it into a virtual ground and I'm sure it would be possible to get very near the datasheet spec.

Quote:
Originally Posted by BachAudioDK View Post
Do you really need so high output of 1.2Vrms to drive your amp/speakers/headphones ?

(my guess is that during normal listning levels, your volume control is properly turned well below 12 O'Clock)
Hair trigger volume controls are one of my pet hates. My downstream gear is designed on the premise that sources put out 2V RMS and that I want 3/4 of the volume control to be useable. I don't doubt that what I had with the differential tube input stage and the 10R I/V resistors would give a better THD measurement. Didn't sound as good as the 133R passive I/V! (And to be honest, my initial expectations before I ever heard the DAC, just knowing the value of the default I/V resistor, was a slew limited, muddy, crappy sound. That it doesn't sound that way and I prefer it to an active stage that on paper should result in better performance, go figure......)
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Old 20th December 2012, 12:31 AM   #72
pdb is offline pdb  Denmark
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Doede has added the DDDAC Power supply to his 1794 webshop - 5 and 12 volt / 1A in kits and assembled versions. Scroll down on this page

DDDAC 1794 NOS DAC - Non Oversampling DAC with PCM1794 - no digital filter - modular design DIY DAC for high resolution audio 192/24 192kHz 24bit

He has also updated the page about power supplies accordingly. Scroll down

DDDAC 1794 NOS DAC - Non Oversampling DAC with PCM1794 - no digital filter - modular design DIY DAC for high resolution audio 192/24 192kHz 24bit

Looks neat :-)

Per
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pdb
......
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Old 22nd December 2012, 10:01 PM   #73
tuyen is offline tuyen  Australia
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Thanks for the heads up, Per.

Have been waiting for this!
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Old 23rd December 2012, 11:05 AM   #74
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Hi,

thinking about getiing a kit, just a question.
I understood that no driver is required for Mac OSX 10.6 and later: am I right?

Thank you

northernsky
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Old 23rd December 2012, 06:25 PM   #75
clivem is offline clivem  United Kingdom
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Quote:
Originally Posted by northernsky View Post
I understood that no driver is required for Mac OSX 10.6 and later: am I right?
Lucien is the person to give you a definitive answer to that question. That's what it says on his website. Your question might be better asked in the WaveIO thread.
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Old 23rd December 2012, 06:27 PM   #76
clivem is offline clivem  United Kingdom
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Is anyone (aside from Doede) running the WaveIO from a dedicated PS? I spent the day trying to hear any difference at all from it being powered from the USB bus or a dedicated power supply and I damned if I can hear any difference at all!
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Old 23rd December 2012, 06:33 PM   #77
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clivem: try hi-res flac.
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Old 23rd December 2012, 06:52 PM   #78
clivem is offline clivem  United Kingdom
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Quote:
Originally Posted by jeremysk View Post
clivem: try hi-res flac.
Yes, I have been. When I first thought about it, higher sample rates, higher current draw, so any differences are likely to be more obvious at higher sample rates. I've listened to a bunch of native high-res material along with other stuff that I have software upsampled 44.1k -> 176.4k. Even had the DAC plugged into my headphone as well as speaker rig. Maybe what I used to consider to be golden ears have turned into cloth ears. LOL. I really can't hear any differences. Nothing subtle. Nothing at all.

I've also tried the laptop as well. So I've been listening bus powered driven from my Logitech Touch and bus powered from my old Samsung NC10 laptop running Linux.

Last edited by clivem; 23rd December 2012 at 06:53 PM. Reason: typo
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Old 25th December 2012, 11:40 AM   #79
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Great project Doede!

I have a few Q...
Why 2 chips on 1 board? Is it dual mono?
How do you control volume?

Happy Holidays
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Old 25th December 2012, 06:47 PM   #80
clivem is offline clivem  United Kingdom
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Quote:
Originally Posted by Panda2 View Post
Why 2 chips on 1 board? Is it dual mono?
I'm not Doede, but I'll bite....

Yes, configured for dual mono, so one DAC chip for left channel, the other for right channel.

Quote:
Originally Posted by Panda2 View Post
How do you control volume?
Either from the pre-amp that you plug the DAC into, or in software on the computer or whatever else you are using to feed it via USB.
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