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ES9038Q2M Board
ES9038Q2M Board
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Old 20th June 2018, 07:03 PM   #1541
androa76 is offline androa76  Slovenia
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Mikett, you mix again es9028pro and es9038q2m. As i told current consumption is less than 10ma on AVCC pin!!! es9028pro is tottaly different dac.
So no problem for any of lt30XX family.
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Old 20th June 2018, 08:15 PM   #1542
Mikett is offline Mikett  Canada
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No mixing. I know.
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Old 20th June 2018, 08:21 PM   #1543
Markw4 is online now Markw4  United States
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Okay, that is a start with data up to 352kHz. However, I have had my 9038Q2M up to 960kHz. Not sure if 9028 can go that high or not. If so, you probably want to allow for 300-400mA at least. Either that or measure the highest it can go first and then design the power supply, which would seem to be the more sensible approach.

Still probably wise to open a new thread for 9028PRO.

Last edited by Markw4; 20th June 2018 at 08:23 PM.
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Old 20th June 2018, 08:55 PM   #1544
Mikett is offline Mikett  Canada
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Moving from 9038Q2M to a 9028Pro board
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Old 22nd June 2018, 06:32 PM   #1545
Markw4 is online now Markw4  United States
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With all the recent activity in other threads I am afraid we may not be giving enough attention to ES9038Q2M modding progress. It sure would be great to hear from anyone who has some new build or mod progress to report. Any questions would be quite welcome too, of course. Anybody have anything?
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Old 23rd June 2018, 03:22 PM   #1546
TioFrancotirador is offline TioFrancotirador  Poland
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Quote:
Originally Posted by Markw4 View Post
With all the recent activity in other threads I am afraid we may not be giving enough attention to ES9038Q2M modding progress. It sure would be great to hear from anyone who has some new build or mod progress to report. Any questions would be quite welcome too, of course. Anybody have anything?
Why not to push it to the limits then ...

es9038q2m_A123.jpg - Google Drive

1xLifePo4 A123 3.3V for AVCC
1xLifePo4 A123 3.3V for CCHD-950-100Mhz

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Old 23rd June 2018, 04:06 PM   #1547
bravem01 is offline bravem01  United Kingdom
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Hi, just got a v1.07 board (it came with no information) and I am running it on +/-12volts. Should it work spdif from a cd player and Tos from TV as currently have no sound.
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Old 23rd June 2018, 05:49 PM   #1548
Markw4 is online now Markw4  United States
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@bravem01, the first couple of jumpers should select the input you want to use. For my 1.06 board with J1 on and J2 off, that selects optical (TOSLINK) input. J2 on and J1 off select SPDIF (coaxial).

The other higher number jumpers select reconstruction filters which will affect the sound, so you can chose the one you prefer. Wherever you purchased the board from should have a picture in the ad showing what the jumpers do. You should save a copy of that for reference.

Also, you can usually contact the seller by using the messaging feature at ebay or aliexpress, wherever you made the purchase, to ask questions about things like that. It may take them a day or two to respond but usually they try to be helpful.

Please let us know if that helps or if there is still a problem.

In addition, don't know how much you have read about the board in this thread but you shouldn't be surprised if the sound quality isn't very good until you start doing some modifications on it.

Last edited by Markw4; 23rd June 2018 at 05:52 PM.
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Old 23rd June 2018, 05:51 PM   #1549
Markw4 is online now Markw4  United States
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@TioFrancotirador, That looks like it should have very clean power. I do wonder with long battery leads if they make a big enough loop to pick up stray magnetic fields?

Also, wondering what you are using for an output stage? And what about after that for amplification?

Thanks in advance for any more information you may provide.
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Old 23rd June 2018, 06:35 PM   #1550
TioFrancotirador is offline TioFrancotirador  Poland
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Quote:
Originally Posted by Markw4 View Post
@TioFrancotirador, That looks like it should have very clean power. I do wonder with long battery leads if they make a big enough loop to pick up stray magnetic fields?

Also, wondering what you are using for an output stage? And what about after that for amplification?

Thanks in advance for any more information you may provide.
Yep shortening the leads should help. I will try it.
The output stage is discrete class A zero global feedback Legato 3.1 from twistedpearaudio (my favorite one). The amp is Modulus-86 from neurochrome (my best amp so far).
with Lifepo4 for AVCC it is sooooo easyyy listening. For the clock it did not matter that much. I already had LT3042 with Salas Ref-D as preregulator for clock. Seems AVCC is most sensitive.

Now

My 2xMaxwell supercaps 3000F (yes farads!) are one the way I will put two in series and charge them with cc/cv @ 3.4V. Their total output impedance will be 0.58mOhm! (LifePo4 has couple for mOhms). They can urge around 200A (Amps!) energy . No electrical nor chemical noise. Although LifePo4 has the least chemical noise, yet there is still some.

So, more to come. I will let you know about my findings soon!
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