DAC-END R (ES9018) full assembled board

[rredline]

I received my DAC two weeks ago, but only now had the time to give it a look.
The power cord has a US plug and the transformer (model R-30, 25VA) say 115V.....
Before plugging the DAC in at 220V I guess I'd better ask if this is fine or if some mixup has occurred

May be you've already know about it...
You should be aware that Hot and Neutral are reversed for US & UK plugs. If you use a normal UK power cord, you may need to reverse the wires at the back of the EMI filter. Better clarify it with Quanghao.

 

[palmito]

Hi Palmito,
I have the LL1684 hooked up like in this schematic.
Attention: the pin layout is from the bottom view (where you can see the pins), not like in the LL1684 pdf where it is the component view (where you see the label).
Regards,
Danny

Thanks Danny_66. So post #866's diagram is correct for both channels, except the labeling of the transformer should say "bottom view (facing pins)"?

 

[danny_66]

Yes correct, I just noticed the wrong labeling, now it's corrected

 

[kmajjo]

Hi Palmito,
I have the LL1684 hooked up like in this schematic.
Attention: the pin layout is from the bottom view (where you can see the pins), not like in the LL1684 pdf where it is the component view (where you see the label).
Regards,
Danny

Hello,
Do you think that LL1539 is a good candidate ?
http://www.lundahl.se/wp-content/uploads/2013/05/1539.pdf
Br
Jcky

 

[rredline]

you may need to reverse the wires at the back of the EMI filter. Better clarify it with Quanghao.

Sorry, somehow I've mixed up there, the IEC socket side should be fine, so no wires-switching is needed at the filter side.

 

[smoothquark]

Hi Quanghao, any updates on my DAC yet? On a different note, any thoughts about your next project? How about Hypex ncore monoblocks in a matching chassis? After all, the DAC can function as a suitable pre-amp.

 

[danny_66]

Do you think that LL1539 is a good candidate ?

No idea, if you have them laying around you could try them.
Here is someone who tested the ll1539 with the ES9018.

I do know that the amorphous cores like the LL1684 sounds more detailed, better resolution.

 

[randytsuch]

Thanks Danny_66. So post #866's diagram is correct for both channels, except the labeling of the transformer should say "bottom view (facing pins)"?

It turns out it doesn't matter, it would work correctly either way.
It took me a little while to figure this out, but if you check you should find the same thing. You need to flip it so the primaries stay on the same side.

Randy

 

[palmito]

It turns out it doesn't matter, it would work correctly either way.
It took me a little while to figure this out, but if you check you should find the same thing. You need to flip it so the primaries stay on the same side
Randy

Thanks Randy, got it. Burning it now...

 

[TarnishedEars]

Does anyone know if there is a confirmed working fix for the SP/DIF input not working with higher sampling rates yet? I've seen a number of posts on this topic, but I've not sure if this problem has actually been resolved yet or not.

 

[rredline]

Does anyone know if there is a confirmed working fix for the SP/DIF input not working with higher sampling rates yet? I've seen a number of posts on this topic, but I've not sure if this problem has actually been resolved yet or not.

The COAX input circuits largely follows ESS official implementation so in theory it should works. I believe TPA has a similar implementation too. Compared to others, Quanghao has removed a 0.1uF cap before the input of the pulse transfo and a 0.1uF cap in the comparator circuits (C36). I believe his goal is to minimize the usage of caps in signal path to increase sound fidelity.

I do not have SPDIF source to test but from the limited info I gathered, I may try the following non-destructive mods to test the COAX input before implement it on the board itself.

 

[audiodesign]

Does anyone know if there is a confirmed working fix for the SP/DIF input not working with higher sampling rates yet? I've seen a number of posts on this topic, but I've not sure if this problem has actually been resolved yet or not.

There is no problem to use the spdif with high sampling rates.

 

[TarnishedEars]

There is no problem to use the spdif with high sampling rates.

With all due respect: Are you serious?

Then is it supposed to be my imagination that anything higher than 48kHz never, ever locks on SP/DIF, and that 96kHz over Toslink is just barely stable (cuts-out occasionally), and that 192kHz over Toslink is unusable?

I don't know why this problem is occurring here, but I can absolutely verify that all of these signals (which I am sending from my Oppo, via the same exact cables) are being decoded without any issues on a Teac DAC I have. But when I send these exact same signal to this unit, it simply fails to lock at all.

So I appreciate it when other people on the forum are trying to design a fix to a very serious issue which you guys seem to be in complete denial about.

 

[gjorgji]

@ Danny,

If I want to rewire mine to work on 110V, I guess I use only one set of the 110V primaries (red/yellow or blue/brown)? I have asked QuangHo for wiring diagram but have not received any response.

Hi NicMac,
Those R-30 transformers can be configured for 115vac or 230vac, they have dual primaries of 115vac, connected in series is for 230 vac.
I've connected the yellow-blue wire together for 230vac, the red and brown goes to the socket, see pictures.
Regards,
Danny

 

[Erlend Sæterdal]

@ Danny,

If I want to rewire mine to work on 110V, I guess I use only one set of the 110V primaries (red/yellow or blue/brown)? I have asked QuangHo for wiring diagram but have not received any response.

This is diy. You have to think just a little bit by yourself.

 

[audiodesign]

@ Danny,

If I want to rewire mine to work on 110V, I guess I use only one set of the 110V primaries (red/yellow or blue/brown)? I have asked QuangHo for wiring diagram but have not received any response.

Could you send me a photo of your transformer ?

 

[audiodesign]

With all due respect: Are you serious?

Then is it supposed to be my imagination that anything higher than 48kHz never, ever locks on SP/DIF, and that 96kHz over Toslink is just barely stable (cuts-out occasionally), and that 192kHz over Toslink is unusable?

I don't know why this problem is occurring here, but I can absolutely verify that all of these signals (which I am sending from my Oppo, via the same exact cables) are being decoded without any issues on a Teac DAC I have. But when I send these exact same signal to this unit, it simply fails to lock at all.

So I appreciate it when other people on the forum are trying to design a fix to a very serious issue which you guys seem to be in complete denial about.

Are you using the DAC module inside a metal chassie ?

Have you got the DAC shield by Qhanghao ?

Are you using the filter on main power ?

Have you tested the spdif output with other DAC ?

Also I would like to know if other person have problem with spdif.

 

[Domi_78]

Hi Andrea,

Also I would like to know if other person have problem with spdif.

1 DOMI_78 : I am encountering this problem : http://www.diyaudio.com/forums/quan...9018-full-assembled-board-98.html#post3552384

 

[audiodesign]

Hi Andrea,

1 DOMI_78 : I am encountering this problem : http://www.diyaudio.com/forums/quan...9018-full-assembled-board-98.html#post3552384

Have you tried to disconnect the input resistance (75 ohm) on DAC ?

Your source can be incompatible with this load.

The standard input impedance is 75 ohm but I remember your other DAC have an input of 1500 ohm.

 

[danny_66]

gjorgji,
for 110vac you need to wire the two primaries in parallel,
connect the mains neutral to the start of both primaries, live to the ends.
The start of a winding is usually marked with a dot.