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DIY ES9018 Hi-end USB DAC
DIY ES9018 Hi-end USB DAC
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Old 26th May 2017, 12:43 PM   #291
Salar is offline Salar  Germany
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Join Date: Feb 2006
Location: Germany
Connecting the ground planes beyond the DAC in the red circled area reduces the hum a lot. They are connected somewhere anyway but I assume return paths become shorter by doing so. Still not perfect, but not very much louder than other DACs.
No hints for what the pads are good for and of course no support from the seller whose name is prominently featured on the attached photo.
I assume the marked areas are not for shortening but for smd caps and proper decoupling of the ground planes.
Anyone any idea what the values might be?
All the best,
Salar
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Old 26th July 2017, 12:11 PM   #292
Tager is offline Tager
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I need your advice!
DAC ES9018 DAC Amanero (MINI SHOW) ES9018 DAC with MUSES8920*2+LME49990*2+Display + Amanero USB card L1611-10
When replacing the OPAMP in the I/U one MUSES8920 I put inverted key 180 degrees, After 10 seconds I realized it and turned off the device.
Now is not working the right channel no sound. OPAMPs now the norm and I/U and buffer (reversed - left is right, put others, both MUSES8920 put in another DAC - they are OK).
And this "Amanero ES9018 DAC" in right channel silence. The voltage on the OPAMPs in both channels in normal. On the Board with operas clean, nothing burnt, no smell of fire. The main PCB is also normal.
Tell me, what else needs to be check and change, repair, soldering? Tell me what to do.
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Old 12th February 2018, 01:40 PM   #293
Detectit1 is offline Detectit1
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Join Date: Jan 2018
Need some advice....

Are these boards from Mshow worth buying? With the ES9038pro chip.

In comparison to the other little DACS out there.

Like the Melokin DA
Topping DX7s
Pro-ject pre box digi s2?

Considering the price there is so little info or reviews about it.
You would think everybody wants to try it at least. Before buying a 1000 Dollar DAC.

Last edited by Detectit1; 12th February 2018 at 01:42 PM.
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Old 19th February 2018, 07:58 PM   #294
Salar is offline Salar  Germany
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Coming back to the "Black Board" ES9018 Dac shown in Post #291.
I still have the hum problem- some sawtooth like noise around 100hz I guess - it can be heard with no signal and with the amp ramped up. I guess it must be around -80dB.
So not really annoying but the hum is only there, when the circuitry of the crystal clock is powered by its dedicated AC input
The Dac has 3 voltage circuits, for the output stage, DAC and clock.
Again witout the clock powered, the DAC is completely silent. With the clock (crystal) powered from its dedicated AC-Input, the hum is there.

Powering the Clock and output stage only makes the hum even more audible.

I got the schematic attached from the seller.
In the schematic there are differend ground planes for the the DAC, clock and output stages.
The ES9018 and its power supply are connected to the classical gnd, the triangle marked with stripes.
But the analog output stages, clock and their psu are connected to an equipotential - an "empty" triangle-what does this mean in practice?
Are those different grounds connected at one point - or not connected at all?

Measuring with the voltmeter all circuitry seems to share the same ground,
i.e measuring between the crystals housing to the Dacīs grounds or the output jacks. Something wrong here - or normal?
All the best,
Salar
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Old 19th February 2018, 08:50 PM   #295
phase is offline phase  United States
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Have you tried using the other 9v winding from the transformer, just to rule that out?

You could try snubbing the diodes with a .1uf cap, just to see if it makes any difference, after all, maybe the diodes are bad. I have had some get noisy from too much heat during soldering.

The 7805 regulators are cheap, maybe just try replacing it to see if that is causing the noise.


I’m assuming you don’t have a scope...
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Old 19th February 2018, 11:21 PM   #296
Salar is offline Salar  Germany
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Hello phase,
thanks for the answer!
I have a scope and can try to make the hum/buzz visible.

I also swapped windings with no difference.

Again, connecting CON2 (see schematic) to a transformer will introduce the buzz. With CON1 and CON3 the Dac is silent.

With CON2 (crystal) and CON1 (output stage) connected to a transformer the buzz is even louder

This is why I thought of some error in grounding.

Changed the regulators but - well - no change.

You mean the recifier diodes?

Not checked / swapped yet. Donnīt think it is them as I can produce more hum by leaving one rectifier circuit out
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Old 20th February 2018, 09:41 AM   #297
Salar is offline Salar  Germany
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I cannot display the hum on the scope, I assume with 5mV on the scope and the probe set to x10 the measuring range is 0.5mV.
And again, the buzz sounds like the good old guitar ampīs open ground...

And again, very quiet but probably avoidable as the two other cicuits do not hum at all. This brings me back to the schematic:
Do the ground planes of Clock and DAC have to be seperated?
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Old 20th February 2018, 10:53 AM   #298
Salar is offline Salar  Germany
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Just checked the GND connections between clock crystal and circuitry on my Buffalo II DAC - greatest DAC I own so far -
ground of crystal and the rest of the circuitry are connected. Checked also to bypass the "soft" grunding of the chinese / Weiliang DACīs circuitry
and connect it to the amplifiers ground - but this this even made the hum more audible.
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Old 20th February 2018, 04:40 PM   #299
kinsei is offline kinsei
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i guess the analog supply is the problem, you may try feeding CON3 with batteries
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Old 20th February 2018, 09:42 PM   #300
Salar is offline Salar  Germany
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Powering CON2 produces the hum... The decoupling capacitors of CON2 and 3 are connected to an equipotential in the schematic,
as well as the crystal oscillator and the toslink receiver - CON2 and the complete rest of the circuitry are not
So i assume the equipotential symbols are just nonsense...
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