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DAC-END R (ES9018) full assembled board

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#1,322
DAC received. Thank you.

I was planning to use the "SEN" I/V stage, but it requires 4x Salas reg boards and 4x transformers -
it's going to be difficult to fit everything in the chassis!

But I just saw this diagram in an earlier post by Andrea -
http://www.diyaudio.com/forums/quanghao-audio-design/228755-dac-end-r-es9018-full-assembled-board-63.html#post3509756
Wow, direct output with no I/V stage. Has anyone tried this? Sounds ordinary/OK/good/great?

And Andrea suggests a passive RC filter at 100kHz, can someone tell me what component values are required for this?
Does it depend on my amplifier's input impedance? It's 20k.
 

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#1,323
Hi linuxfan,
linuxfan said:
...Wow, direct output with no I/V stage. Has anyone tried this? Sounds ordinary/OK/good/great? And Andrea suggests a passive RC filter at 100kHz, can someone tell me what component values are required for this? Does it depend on my amplifier's input impedance? It's 20k.
Click to expand...
Referring to your schematic and related to ground : (+1.65V -1.65V) = 0V ... but I don't know what does mean "ES9018 un-balanced with 8 DAC outputs in // (register 19 set to 0b11111111" on this schematic.
Usually, you need an op amp like that to get un-balanced output from balanced output.


Update : Concerning register 19 and according to this post, it seems to be possible to change the output phase of the ES9018.
 
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#1,324
Domi_78 said:
Update : Concerning register 19 and according to this post, it seems to be possible to change the output phase of the ES9018.
Click to expand...
Yes, Andrea added the option in software-control to invert the phase of the DAC- outputs, and use these in parallel with the DAC+ outputs. He refers to this as "unbalanced mode".
Total current is then double; approx 16mA per channel instead of 8mA per phase.

I want to know what capacitor (and resistor?) I would need for his suggested RC filter.
 
#1,325
linuxfan said:
DAC received. Thank you.

I was planning to use the "SEN" I/V stage, but it requires 4x Salas reg boards and 4x transformers -
it's going to be difficult to fit everything in the chassis!

But I just saw this diagram in an earlier post by Andrea -
http://www.diyaudio.com/forums/quanghao-audio-design/228755-dac-end-r-es9018-full-assembled-board-63.html#post3509756
Wow, direct output with no I/V stage. Has anyone tried this? Sounds ordinary/OK/good/great?

And Andrea suggests a passive RC filter at 100kHz, can someone tell me what component values are required for this?
Does it depend on my amplifier's input impedance? It's 20k.
Click to expand...

Why 4 tranformers and 4 Salas ? I will use the Balanced Bride and use one transformer for each channel and one Votage one. I use same cabinet as the dac. Holton Precision Audio Online Store - Audio Electronics -.
 
#1,326
Erlend Sæterdal said:
Why 4 transformers and 4 Salas ?
Click to expand...
Each SEN phase requires fully separate +16V supply. Also, the SEN is highly sensitive to mains noise, so users on pinkfishmedia forum recommend separate dual-bobbin AC transformers.

Now that I think about it, I don't need balanced output at this stage (maybe I will upgrade to class A balanced amp in the future)
so I can just use one-half of each SEN board, 2x Salas reg boards and 2x dual-bobbin AC transformers.

... but the direct-output option still looks appealing!

Erlend Sæterdal said:
I will use the Balanced Bride and use one transformer for each channel and one Votage one.
Click to expand...
This sounds interesting, but I don't undestand - you're using transformer as output stage? Into balanced preamp?
 
#1,327
Why use salas regulators..? If you have or buy the analogstage from Quanghao, you got 4pcs shunt regulators in a ver very low noise quality.!
These regulators gives 15V/-15V and that should be ok for the SEN
Br
Caad

linuxfan said:
Each SEN phase requires fully separate +16V supply. Also, the SEN is highly sensitive to mains noise, so users on pinkfishmedia forum recommend separate dual-bobbin AC transformers.

Now that I think about it, I don't need balanced output at this stage (maybe I will upgrade to class A balanced amp in the future)
so I can just use one-half of each SEN board, 2x Salas reg boards and 2x dual-bobbin AC transformers.

... but the direct-output option still looks appealing!


This sounds interesting, but I don't undestand - you're using transformer as output stage? Into balanced preamp?
Click to expand...
 
#1,328
Domi_78 said:
Hi Halook,
Here is close up of the spdif section of my board.
- On mine, R68 is installed but this part of the circuit does not concern the coaxial input.
Click to expand...

Hi Domi_78,

Have you fixed the SPDIF in to accept 48KHz or above?

I have soldered a 0.1uF onto C36 position but mine still does not work with 96KHz or higher.

Quanghao / Andrea,

Any suggestion to fix the SPDIF input to accept 96KHz or higher
 

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#1,329
Hello Ganghao, as for the firmware, it says volume saved (for instance 100%), but when I put it off and off it comes back to 40%). I can live with that, but I would like ++ to effectively saved the last input used!. Another thing, if you leave it on for a night, it locks no more and you have to put it off then on.
As for the music, after warming with 12 h using, your DAC is really a killer. I prefer 70 K and soft roll. The sound is really astonishing, I listened a lot of music and test discs yesterday evening and today and just finish the listening by Voyage (Youm Sun Nath) and the "Live at the Filmore" extracted for the archives volume of Neil Young (both very high quality recordings). The sounds are real, there is air, good image, and full range is precise. I have attended thousands of concert these last 40 years. Both CD sounds like living performance. Never heard that before on my set. Very nice. If the new output is still better, we are we going?
 
#1,331
linuxfan said:
Each SEN phase requires fully separate +16V supply. Also, the SEN is highly sensitive to mains noise, so users on pinkfishmedia forum recommend separate dual-bobbin AC transformers.

Now that I think about it, I don't need balanced output at this stage (maybe I will upgrade to class A balanced amp in the future)
so I can just use one-half of each SEN board, 2x Salas reg boards and 2x dual-bobbin AC transformers.

... but the direct-output option still looks appealing!

you can use my shunt of IV opam for other iv,
You need remove the jum for +-15 v to the IV opam one the PCB IV.

it can use about total 40mA for other IV
thanks
This sounds interesting, but I don't undestand - you're using transformer as output stage? Into balanced preamp?
Click to expand...
 
#1,332
linuxfan said:
DAC received. Thank you.

I was planning to use the "SEN" I/V stage, but it requires 4x Salas reg boards and 4x transformers -
it's going to be difficult to fit everything in the chassis!

But I just saw this diagram in an earlier post by Andrea -
http://www.diyaudio.com/forums/quan...9018-full-assembled-board-63.html#post3509756
Wow, direct output with no I/V stage. Has anyone tried this? Sounds ordinary/OK/good/great?

Hi!

No, in this code, you can not use unbalance out, because, i change all when sent to all.

The sound or unbalance , i test it not good for the sound. Please keep balance out put, wit my Iv or other IV, if you need and like!

thanks
Click to expand...
 
#1,335
Halook said:
Hi Domi_78,

Have you fixed the SPDIF in to accept 48KHz or above?

I have soldered a 0.1uF onto C36 position but mine still does not work with 96KHz or higher.

Quanghao / Andrea,

Any suggestion to fix the SPDIF input to accept 96KHz or higher
Click to expand...

There is a trace shorting out C36, you need to cut the trace otherwise the cap doesn't do anything.
 
#1,340
linuxfan said:
DAC received. Thank you.

I was planning to use the "SEN" I/V stage, but it requires 4x Salas reg boards and 4x transformers -
it's going to be difficult to fit everything in the chassis!

But I just saw this diagram in an earlier post by Andrea -
http://www.diyaudio.com/forums/quan...9018-full-assembled-board-63.html#post3509756
Wow, direct output with no I/V stage. Has anyone tried this? Sounds ordinary/OK/good/great?

And Andrea suggests a passive RC filter at 100kHz, can someone tell me what component values are required for this?
Does it depend on my amplifier's input impedance? It's 20k.
Click to expand...

I am using this configuration. No filter. Direct out to Symasym. I have changed the output configuration of the DAC to unbalanced out as documented by audiodesign, shorted Out + and -. I can't compare it to other iv stages yet. All I can say is I am very happy with this configuration so far.
 
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