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Old 7th June 2014, 08:48 AM   #521
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Quote:
Originally Posted by farhun View Post
Have you ever tried using beads on both input pins? On the other hand, are you using the beads on pin2(inv. input) of the last stage opamp only?

I did use 2 600 ohm resistors on another diyinhk ES9018 board's last opamps which is the earliest version, I did not notice any sonic improvements. I have dismantled it to built a transformer based IV stage using a triode amp stage or buffer.
Lundahl has some input/inter-stage transformers, I tried one(LL1540) in a line stage to input SE inputs as balanced inputs with success. It came out good, so I intend to try same transformer or anther one, preferably 1:2 into a tube amp. and abandon the whole ss based IV and outputs, but in near future, I'm busy at the moment.

Apart from this, I believe you like 49713s probably you will go for them eventually... That is the same over here, I like 49990s too. Both opamps are very close in sonic signature to me.

Thanks for the posts again.
Hi Farhun
I have not tried the ferrite beads on both negative and positive inputs of the IV opamps. I am not sure whether one on the positive input makes things better or worse. I am not sure whether the HF noise is common mode or not in which case filtering the 1/2 Avcc supply with the ferrite bead would be detrimental.
I have not used the CFB opamps in the balanced to single ended conversion position so can't say whether the opamp would be stable with the ferrite bead. I suspect that in this position, it would be better to fit ferrite beads in both inputs to keep the circuit symetrical.
Personally, I have gone from a valve output stage to SS. I don't think valves do justice to exceptional technical performance of this DAC chip. Mind you, the valve stage sounded very good too but not as good as say the LME49713 in the IV stage.(I only use balanced out) YMMV.
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Old 7th June 2014, 04:12 PM   #522
farhun is offline farhun  United States
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The last opamp stage is differential, it only makes sense beading the both inputs.

Then, for the other two opamps, using bead only on the signal input should be sufficient, the other is used for an offset voltage of half of Avcc and this offset is cancelled out in the differential stage.

It is logical to thing that an elegant opamp should integrate with an elegant DAC much better than a valve based system, first and the for most for the reason of slew rate! And low noise floor, 0.00...0x THD=N, etc.
Well, there are points on the board that you can tap to the raw voltage outputs of 9018 chip, that is where the elegant DAC's obligations end. This point on is another story. In my case, everything eventually turns into vacuum state since I use tube amps in the rest of the chain.

I believe a passive IV stage into an amp stage is an option.Worth to try it out. If anyone who has already done this is here now should share his experience.
Also, a transformer with two coils in each side, or center tap in each side can be employed here, and better to use 1:2 or higher step. A filter and impedance matching network may be needed too.
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Old 8th July 2014, 10:19 AM   #523
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Well, couple of ferrite beads more to solder and I'm done with this sucker
Not so nice but..

Click the image to open in full size.
Click the image to open in full size.
Click the image to open in full size.

One question, what transformers did you guys used and in what configuration? One for all or couple separated for each regs?
I'm thinking of two torodial, one with four secondaries for 2x 6V for 3,3V regs for ES9018 board, and maybe 2x 12V for regulators for other stuff like arduino (~8V) and SPDIF reciever (5.25V) and socond torodial for I/V stage regulator (12-0-12V).
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Old 10th July 2014, 07:15 PM   #524
voy is offline voy
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Well this is my version of this DAC, and I'am a bit scared to turn it on.
3 questions :

1 Is the crystal orientated in the right position?
2 The EN jumper on the other site of the crystal is the jumper ON internal clock and jumper OFF the external clock?
3 do you see anything obvious wrong with it?

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Click the image to open in full size.

imgur: the simple image sharer big

imgur: the simple image sharer big
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Old 12th July 2014, 11:22 AM   #525
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-I think crystal postition is OK. Dot is pin number one, you could also check datasheet to be shure.. You have also marked first pin on PCB.
-Jumper enables crystal that is on the board, mentioned in your first question, but if you want to use external clock source, lets say from amanero board, you can disable onboard clock by removing jumper.
-I think that you need to cut one trace (see spot printed on PCB) because you installed additional capacitor for AVCC_R and power connector, because you want to power analog parts of the chip separately, right?
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Old 13th July 2014, 04:08 PM   #526
voy is offline voy
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First of all thank you for your response, not a lot a people here are willing to help a beginner.

Out of frustration that nobody responded to my question I turned it on, and no magic smoke, but music! for about 5 seconds then a big humm.There were 6 caps the wrong way around, I think for the negative power for the opamps. But is works and sounds wonderful. Sometimes it's almost scary how much detail there is now in 44Khz material.

The board works with or without the xtal jumper... don't know why. Is it getting the clock from the xmos usb to i2s board with the jumper off?

Yes I know I need to cute the trace but I was not ready for that, I first wanted a basic config that works. And Yes I have one power board for the 12v +/- 2x 3.3 for avcc L and avcc R. 1 board with 3,3 for the digital part and 1x 5v for the Xmos USB to I2S board.

The next thing would be to connect the arduino, but that's were I got stuck now.
This is what I get when I turn it on. I think that the deformed symbols are there because It does not communicate with the es9018 but I could be wrong...

Click the image to open in full size.

The IR sensor works the volume go's up and down by remote so I think the code runs correctly

Click the image to open in full size.


I have 3.3 and 5v on the level converter, the L side on the es9018 the H side on the controller but nothing. Tried it without the level converter same thing.

Click the image to open in full size.

Click the image to open in full size.

Click the image to open in full size.

If I play with the adress jumper on one setting the arduino does not boot.
The es9018 mutes with the arduino connected.

Maybe I missed a setting in the arduino code?

Anyway thanks for your help, If you have any ideas let me know.
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Old 13th July 2014, 04:45 PM   #527
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Did you tried to swap I2C wires? Double checked level shifter wiring?
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Old 13th July 2014, 04:55 PM   #528
voy is offline voy
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Yes I did swap the I2C wires but the result is the same. I don't have a scope so I can't see whats going on there. Also I tried without the lever convertor also the same. I orded a second aruino to test.
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Old 13th July 2014, 06:03 PM   #529
voy is offline voy
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Update :

There is communication between the es9018 and the aduino. When I turn the system on there is sound, but It mutes right after that aduino boots. Then nothing, if I use the reset jumper on the es9018 board sound returns and I get 44 Khz in the display, volume up and down also works. Still strange symbols on the display. Don't know whats going on..
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Old 14th July 2014, 05:51 PM   #530
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The strange symbols on the display are probably due to incompatibility between the lcd and the code. Identify the symbols not displaying properly and change the code appropriately.

Sent from my RM-914_eu_euro1_280 using Tapatalk
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