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Chinese ES9018K2M I2S DAC
Chinese ES9018K2M I2S DAC
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Old 22nd August 2017, 05:30 PM   #141
magman is offline magman  Lithuania
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Join Date: Nov 2011
Location: Kaunas
Here are some photos of my project in temporary box. Now only support optical input, but later it will be spdif, usb and Bluetooth I think. 5 separate 3.3Vdc ADM7150 LDO boards feed from 2 separate transformer winding's (3 for digital and 2 for analog), and Jung super reg V2.3 for output I/V and buffer (last picture my home made board) sorry for blurred pictures
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Last edited by magman; 22nd August 2017 at 05:35 PM.
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Old 22nd August 2017, 06:07 PM   #142
Nico Ras is offline Nico Ras  South Africa
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Quote:
Originally Posted by Naaling View Post
Hi everyone. .....
Comments and opinions would be very much appreciated.
I would be more concerned about dry joints on other components. Just from the photo it looks like two capacitors are hardly soldered on one side.
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Old 23rd August 2017, 09:52 AM   #143
Naaling is offline Naaling  Portugal
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Quote:
Originally Posted by magman View Post
Hi, I looked to my dac and pins are not shorted, but it doesn't make any sense because I looked into datasheet and these pins are: 1- DGND; 2- N.C.
This is a more expensive board, that has been assembled to a higher standard.
Clearly the pins are not designed to be bridged. However, since one of the pins is probably not connected, it won't affect performance. Its just a reflection of the lack of care and attention to detail, that can be expected from these cheap ebay products.
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Old 23rd August 2017, 02:10 PM   #144
wbytalk is offline wbytalk
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es9018k2m and es9028q2m pin definitions are very different!
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Old 23rd August 2017, 06:08 PM   #145
magman is offline magman  Lithuania
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Quote:
Originally Posted by wbytalk View Post
es9018k2m and es9028q2m pin definitions are very different!
Sorry, I didn't pay attention that talk is going about es9028q2m but not es9018k2m
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Old 26th August 2017, 08:40 PM   #146
jeremywakeham is offline jeremywakeham  United Kingdom
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@Naaling my 9028 board does not have a bridge between the 2 pins. One is grounded, the second 740ohm to ground. Have been modding the board, but worked ok beforehand.

@wbytalk you,be used 1.8v power for one pin. My board as standard has 1.3y. Does changing that to 1.8v make a difference. I'm changing the power supplies anyway, so could do either?
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Old 28th August 2017, 03:24 AM   #147
wbytalk is offline wbytalk
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It's safe to use 1.8v as dvdd for the 9018k2m and 9028q2m, 117/317 and 1117 are not acceptable for me here
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Old 29th August 2017, 04:00 PM   #149
freezebox is offline freezebox  Germany
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Hey thanks. looks good this board! Finally a real symmetric DC power for the op amps and no dc blocker caps in signal path at the outputs. But where is the (master?) clock oszillator?
Maybe i give it a try after my bad experiences with the other cheap es9028 board with sw errors and sudden channel changes etc..
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Old 31st August 2017, 10:02 AM   #150
adrian311 is offline adrian311  United Kingdom
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Originally Posted by Naaling View Post
Hi Naaling - it definitely is of interest - it seems that there is already an MCU fitted (ST's STM 8S103F3) programmed to allow access to some of the es9028 internal hardware functions (volume etc). By soldering tact switches onto the lands already on the board this seems to allow volume control and other stuff like switching i2s input etc. Just need to work out if the volume can be accessed using something like a Raspberry Pi already running Moode or Rune etc. Thanks Adrian
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