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A NOS 192/24 DAC with the PCM1794 (and WaveIO USB input)
A NOS 192/24 DAC with the PCM1794 (and WaveIO USB input)
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Old 15th February 2021, 04:04 PM   #8501
NIXIE62 is offline NIXIE62  Serbia
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1. Connect DAC supply GND to chassis with 10ohm + 100nF in parallel.
2. Connect WaveIO suppply GND to chassis with 10ohm + 100nF
3. Connect Pin1 to chassis or to DAC supply GND
4. If there is still some buzzing, put 2.2uF cheap poliester capacitor on each DAC output.
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Old 16th February 2021, 05:11 PM   #8502
mbrennwa is online now mbrennwa  Switzerland
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A NOS 192/24 DAC with the PCM1794 (and WaveIO USB input)
Guys, we discussed tbe XLR connection and grounding/earthing stuff about two weeks ago in this thread. Just look it up in the respective posts.
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Old 17th February 2021, 08:04 AM   #8503
NIXIE62 is offline NIXIE62  Serbia
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[QUOTE=alexanderbax;6534306]Do you have a picture of your set up as an example?

Here's a picture. Plus and minus pin of both greatz 10A 1000V connected together. One AC pin from both greatz connected to the chassis, the other AC pin connected to GND from DAC supply (or WaveIO supplu, separately from DAC). AC pins bridged with 10ohm 2W MOX resistors and 100nF X2 PP capacitors. On the pin where the power supply from the DAC is grounded I connected Pin1 from the XLR connectors. An alternative is Pin1 on the chassis.
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Last edited by NIXIE62; 17th February 2021 at 08:06 AM.
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Old 17th February 2021, 04:20 PM   #8504
mbrennwa is online now mbrennwa  Switzerland
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A NOS 192/24 DAC with the PCM1794 (and WaveIO USB input)
Quote:
Originally Posted by Extreme_Boky View Post
This is what I measured with my DDDAC

fS=44.1kHz: 0dB @ 20Hz = -3.2dB @ 20kHz
fS=88.2kHz: 0dB @ 20Hz = 0.8dB @ 20kHz
That's not so much a question of (non) oversampling, but rather about the sampling theorem. With 44.1 kHz sampling frequency, one cannot capture anything above 22.05 kHz. Oversampling / interpolation / upsampling of such data cannot bring back any audio data that was lost during sampling.

Quote:
Originally Posted by Extreme_Boky View Post
Re: Aleph J.... the original design and implementation can be vastly improved to get truly great 2-gain stage amplifier; try searching the Aleph J thread for Aleph J MKII; I have provided detailed instructions and the modified circuit diagram.
I know the Aleph inside out. Yes, it is a good amp, but that is not the point. Even if you tweak the Aleph, it will still have much more non-linear distortion than the DDDAC. My point is therefore that if you care about distortion, you should point your finger on the Aleph, not on the DDDAC.
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Old 20th February 2021, 08:43 PM   #8505
alexanderbax is offline alexanderbax
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Quote:
Originally Posted by mbrennwa View Post
Guys, we discussed tbe XLR connection and grounding/earthing stuff about two weeks ago in this thread. Just look it up in the respective posts.
Thanks, Mbrennwa. I've take a look back, interesting that it came up so recently too. Nixie thanks for all of your input too!

Well looking back on the discussion from last month, pin1 of the XLR came up a lot. I did the most basic experiment of taking an interconnect and putting one end on pin1 and the other end to chassis (where the XLR plug is bolted). Buzzing completely gone and absolutely silent on the headphones. So I think that's cracked it, I just need to connect pin1 to chassis like in my NC400 amp.

I listened to some music through my headphones even with the ground loop in the background and it still sounded incredible! Wow, absolutely cannot wait to get the solder iron out.

I also decided to upgrade my DDDAC (well tweak) for the first time in a few years and will now run it from a Raspberry pi with FIFOpi attached (and Newclass D Neutron Star clock) feeding directly to the I2S pins of the DDDAC. Also ordered some Salas regs and other PSU bits so I just cannot wait to hear what this is all going to sound like
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Old 21st February 2021, 07:55 PM   #8506
alexanderbax is offline alexanderbax
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Just wanted to report back.... pin1 connected to chassis and no buzzing just awesome sound!!!
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Old 22nd February 2021, 05:37 AM   #8507
dddac is offline dddac  Germany
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Quote:
Originally Posted by alexanderbax View Post

I also decided to upgrade my DDDAC (well tweak) for the first time in a few years and will now run it from a Raspberry pi with FIFOpi attached (and Newclass D Neutron Star clock) feeding directly to the I2S pins of the DDDAC. Also ordered some Salas regs and other PSU bits so I just cannot wait to hear what this is all going to sound like
Nice to hear you are so content with the DDDAC sound

Also nice tweaks ahead! It would be great for the community here, if you would not change everything at once (it will be an improvement, for sure) but one at a time and check/report what the impact was? For example start with the PI than add the FIFOPi with standard clock. change the clock, than add the power supply bits one at a time.... This won't take you more than a Sunday afternoon.

What I always do is "burn-in" the parts already a few days ahead of the tests. Just power them up and let them stay for a a few days or week.

but, your call of course !
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Old 22nd February 2021, 06:58 AM   #8508
NIXIE62 is offline NIXIE62  Serbia
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Quote:
Originally Posted by alexanderbax View Post
Thanks, Mbrennwa. I've take a look back, interesting that it came up so recently too. Nixie thanks for all of your input too!

Well looking back on the discussion from last month, pin1 of the XLR came up a lot. I did the most basic experiment of taking an interconnect and putting one end on pin1 and the other end to chassis (where the XLR plug is bolted). Buzzing completely gone and absolutely silent on the headphones. So I think that's cracked it, I just need to connect pin1 to chassis like in my NC400 amp.

I listened to some music through my headphones even with the ground loop in the background and it still sounded incredible! Wow, absolutely cannot wait to get the solder iron out.

I also decided to upgrade my DDDAC (well tweak) for the first time in a few years and will now run it from a Raspberry pi with FIFOpi attached (and Newclass D Neutron Star clock) feeding directly to the I2S pins of the DDDAC. Also ordered some Salas regs and other PSU bits so I just cannot wait to hear what this is all going to sound like

I don't know what your wiring is in the DDDAC, but I achieved a good upgrade by changing the wiring. I used VDH CS12 for 230VAC and VDH SCS18 for everything else. The difference is big compared to standard 230V copper wires and some silver-plated Teflon-insulated copper wire for everything else.
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Old 22nd February 2021, 01:32 PM   #8509
alexanderbax is offline alexanderbax
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Quote:
Originally Posted by dddac View Post
Also nice tweaks ahead! It would be great for the community here, if you would not change everything at once (it will be an improvement, for sure) but one at a time and check/report what the impact was? For example start with the PI than add the FIFOPi with standard clock. change the clock, than add the power supply bits one at a time.... This won't take you more than a Sunday afternoon.
Thanks Doede, Ill see what I can do as yes it would be very interesting (for me too!!) One thing I can confirm, is that a raspberry pi directly in to the DDDAC (via WaveIO USB) sounds absolutely pants.... I thought my headphones or amp were broken until I moved back to my normal HTPC and the dynamics and openess came back. The pi USB was bass heavy, felt slow (like I was literally bored listening to the music) and lacked life. I will try the I2S perhaps direct from pi before the FIFOpi!
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Old 23rd February 2021, 04:02 PM   #8510
mbrennwa is online now mbrennwa  Switzerland
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A NOS 192/24 DAC with the PCM1794 (and WaveIO USB input)
Quote:
Originally Posted by alexanderbax View Post
I will try the I2S perhaps direct from pi before the FIFOpi!
Expect to be disappointed by the RPi direct I2S out, which has a pretty bad clock (it's not even a proper clock at all). A reclocker will fix this. Ians FiFo is great! It just works out of the box, and if used with good oscillators, the sound is very, very good!
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