ES9023 I2S Input DAC incl. JG Filter Buffer - diyAudio
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Old 24th September 2013, 02:49 PM   #1
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Join Date: Aug 2010
Default ES9023 I2S Input DAC incl. JG Filter Buffer

Dear all
I am happy to announce the availability of the ES9023 I2S input DAC including the JG Filter + Buffer as a ready to use board.
The development of the board has been discussed here on DIYaudio and miniDSP helped me to make the DAC available for those who are not that familiar with tiny SMD soldering.
The board is stuffed with good quality components (MIC5205 Regs, Fox Xpresso low phase noise XO, Pana FR Elcaps,...) including matched FETs for the output buffer. We decided to leave out the 1:4 MCLK divider and also the U.FL connectors to cut cost a bit since not everyone will actually use those; however everything is routed and the corresponding parts could easily be stuffed afterwards.

Please find a short user manual with some more Info here.

The DAC is available through the miniDSP online shop and the price is 40 US$ (+ shipping).
Have fun, Daniel
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Old 24th September 2013, 09:37 PM   #2
gogu is offline gogu  United States
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Join Date: Aug 2004
Location: ***
Hi Daniel,
Is the board using the Fastron 18mH inductors or some cheap Hong Kong version ? Also I noticed there are no trim pots for offset null adjustment on the JG Buffer.
The miniDSP site is not protected (at least for the mandatory registration) and the shipping for USA is $20.
Is the schematic the same as
Anybody using the new ESS Vout DAC (ES9022)? ?
Thank you.
Michael
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Old 25th September 2013, 06:44 AM   #3
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All parts have been ordered from Mouser or Digikey and the Inductors are the 18mH Fastron which have been proven to be very good. The BF862 FETs have been IDSS matched according to my instructions and the output DC offset is quite low (few mV, I have build more than 10 boards and also measured the one from miniDSP). So there should be no need for further trimming. However there is a jumper (0 Ohm resistor) that could be exchanged e.g. by a pot.
Please find attached the final schematic however note that not all parts are populated.
I'll contact miniDSP wrt protected registration.
regards, Daniel
Attached Images
File Type: jpg ES9023 + JG Buffer v1.1 final.jpg (478.0 KB, 1533 views)
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Old 25th September 2013, 04:23 PM   #4
gogu is offline gogu  United States
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Thank you Daniel. Just ordered one.
Michael
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Old 25th September 2013, 05:45 PM   #5
gugi100 is offline gugi100  Netherlands
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Location: IJsselstein
Very nice offer! But shipping costs are $30 to Europe....

Gr GJ
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Old 26th September 2013, 03:20 PM   #6
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Join Date: Oct 2002
Location: SINGAPORE
Ordered a set. Sent email after payment has been made to enquire about delivery schedule and if the shipping has tracking. Two days passed and no reply. I also noticed that there were 3 stars out of 5 stars indicated on the product order page. Just wondering what that means.
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Old 4th October 2013, 06:05 AM   #7
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Default curryman DAC Groupbuy

Since some complained about quite high shipping costs to Europe (30$):
miniDSP had some trouble with standard airmail which would be about 1/2 the price. Parcels got lost and sometimes it took quite long (few weeks). So they decided to only offer speedpost which is really fast and reliable. However I can fully understand that 30$ is quite a lot compared to the boards price of 40$.

Therefore I decided to offer a groupbuy for the German/European customers. Boards will be shipped to me and i will distribute them. Price will be 40 plus shipping.
I will set up a google spreadsheet with all info soon where you can add your DIYaudio ID.
regards, Daniel
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Old 5th October 2013, 11:44 AM   #8
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Join Date: Oct 2002
Location: SINGAPORE
Quote:
Originally Posted by curryman View Post
All parts have been ordered from Mouser or Digikey and the Inductors are the 18mH Fastron which have been proven to be very good. The BF862 FETs have been IDSS matched according to my instructions and the output DC offset is quite low (few mV, I have build more than 10 boards and also measured the one from miniDSP). So there should be no need for further trimming. However there is a jumper (0 Ohm resistor) that could be exchanged e.g. by a pot.
Please find attached the final schematic however note that not all parts are populated.
I'll contact miniDSP wrt protected registration.
regards, Daniel
My board has 45mV on the left and 150mV on the right. Can you tell me specifically where the jumper is and how to add the pot to trim out the dc? Other than this, the sound is truly remarkable and the board is very nice.
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Old 6th October 2013, 04:18 PM   #9
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Join Date: Aug 2010
Thanks for the feedbackand good to hear that you like the sound

While the DC should not be a big problem if the amp is ac-coupled (capacitor or servo) I am wondering a bit about the quite high values. I build more than 10 DACs myself and always had below 10mV (most are 2-4mV). I'll check this with the manufacturer.

The 0 Ohm resistors are R46 and R56, however adjustment only works in one direction. So if you have a small negative offset (e.g. -50mV referenced to ground) you can use a small pot (you'll need approximately 10 Ohm for 50mV) instead of the jumpers to adjust the DC offset.

regards, Daniel
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Old 10th October 2013, 12:26 AM   #10
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Join Date: Oct 2002
Location: SINGAPORE
Quote:
Originally Posted by gogu View Post
Thank you Daniel. Just ordered one.
Michael
Have you received your unit and tested out for dc offset?
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