Joachim Gerhard Filter Buffer for ES9022 - Page 53 - diyAudio
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Old 2nd March 2013, 10:14 PM   #521
EUVL is offline EUVL  Europe
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I suggest you take a closer look at how I did the ES9022, as different from others.
Pictures of both sides of the PCB have been published, so it is not difficult to see.

Anybody using the new ESS Vout DAC (ES9022)?

And you can try to mock up what I did with some SOIC16 adaptor boards, and a lot of P2P in air.

The same circuit done with different layout and different choice of components can sound totally different.
One of the guys who have my 9022 will testify to that, as he has heard two versions of 9022 done differently, with totally different results.


Patrick
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Last edited by EUVL; 2nd March 2013 at 10:21 PM.
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Old 3rd March 2013, 03:55 PM   #522
GaryB is offline GaryB  United States
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Default question about filter

Patrick,
I just put together another ES9023 DAC (Subbu / JP board + their PS) and one of the JG filters from the group buy. It's still burning in but after running all night, it sounds quite promising. Thanks again for making the boards available.

I did have a question about the design. I notice that there are some small 10 ohm resistors at the power supply input - R7 and R8. Could you comment on the benefit of these vs. hooking up the filter directly to a well regulated power supply?

Thanks,
---Gary
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Old 3rd March 2013, 05:02 PM   #523
EUVL is offline EUVL  Europe
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They help to isolate the left & right channel.
You can try to use 0R resistor or even wire jumper to see what you like better.


Patrick
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Old 4th March 2013, 03:25 AM   #524
GaryB is offline GaryB  United States
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Patrick,
Thanks - that makes sense.

On another topic, can I ask about your user name - EUVL. Are you working on that the advanced litho technology that goes by that name?
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Old 13th March 2013, 07:22 PM   #525
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Progress update of 2nd GB.

Matching of BF862 and MMBFJ111 finished. Soldering will soon start. Hope I can deliver in April.

Thanks again for your patience.

WK
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Old 14th March 2013, 10:43 AM   #526
atupi is offline atupi  Romania
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What is the voltage needed to power this buffer ?
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Old 14th March 2013, 11:37 AM   #527
Stixx is offline Stixx  Germany
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The schematic says +- 15V... but I'd like to know myself whether there is a certain range for the supply.
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Old 14th March 2013, 06:19 PM   #528
EUVL is offline EUVL  Europe
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Output voltage swing is about +/-3V.
Cascode voltage for the BF862 (Vds) is about 5V. Idss for the BF862 is 12~25mA.
The J111/J174 can take max 30V Vds, but dissipation is limited to around 250mW.
At below 5V Vds, capacitances for JFETs becomes too non-linear.

So you now have all information needed to calculate max/min rail voltages.
BTW all the above info can also be found in standard datasheets.


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Old 14th March 2013, 07:18 PM   #529
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Default Voltage range

The designer, and at least one other, has tested the filter buffer with 2 x 9V batteries

Anybody using the new ESS Vout DAC (ES9022)?
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Old 19th March 2013, 08:19 PM   #530
GaryB is offline GaryB  United States
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Quote:
Originally Posted by EUVL View Post
They help to isolate the left & right channel.
You can try to use 0R resistor or even wire jumper to see what you like better.
Patrick,
I did the experiment of replacing the 10ohm resistors with wire jumpers and in my system, I think it's an improvement. It feels like the low end is a bit less confused in complex passages and the overall "ease of listening" improved somewhat. I think I'll keep it this way for a while.

---Gary
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