Go Back   Home > Forums > >
Home Forums Rules Articles diyAudio Store Blogs Gallery Wiki Register Donations FAQ Calendar Search Today's Posts Mark Forums Read

Digital Line Level DACs, Digital Crossovers, Equalizers, etc.

Chinese ES9018K2M I2S DAC
Chinese ES9018K2M I2S DAC
Please consider donating to help us continue to serve you.

Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving
Reply
 
Thread Tools Search this Thread
Old 10th February 2018, 03:34 PM   #221
vacuphile is offline vacuphile  Netherlands
diyAudio Member
 
vacuphile's Avatar
 
Join Date: Apr 2011
Location: Seaside
Quote:
Originally Posted by vicnic View Post
ES9018K2M I2S ES9018 IIS-32bit 128 256 384K /DSD64 Input Decoding Board | eBay
Amazing and cheap board The original board shows the third harmonic of the 1kHz 0dB at around -87dB. After the buffer was replaced with this one simple schematic with the +/-15V supply :
http://content30-foto.inbox.lv/album...8K2M/ESbuf.jpg
Now the 1kHz 0dB looks that:
http://content30-foto.inbox.lv/album...2M/1kHz0dB.jpg
1kHz -3dB:
http://content30-foto.inbox.lv/album...18K2M/1kHz.jpg
The mix of 19kHz -6.1dB and 20kHz -6.1dB:
http://content30-foto.inbox.lv/album...9kHz-20kHz.jpg
All this was played from the wav files 44.1kHz 16 bit under WXP>foobar USB Asio out>E-MU0202>I2S>ES9018K2M
Also the the ES9018K2M runs from the E-MUs crystal oscillator 22.579Mhz.

Victor
After measuring disappointing results, I was looking into how to get the best out of exactly the same board, more particularly starting with finding the particulars of this DAC chip. No specsheet to be found.

Victor to the rescue with this ready made and tested solution. Thanks for posting! I love the simplicity.

What I wonder though is why the upper opamp has a 680pF pole setting C in the feedback loop, and the lower one a 220pF? This might not be correct. I suppose they should both be 680pF (at least).

Best,

Paul
__________________
All atoms to the right!
  Reply With Quote
Old 10th February 2018, 05:47 PM   #222
vicnic is offline vicnic  Latvia
diyAudio Member
 
Join Date: Oct 2004
Location: Riga
Quote:
Originally Posted by vacuphile View Post
What I wonder though is why the upper opamp has a 680pF pole setting C in the feedback loop, and the lower one a 220pF? This might not be correct. I suppose they should both be 680pF (at least).

Best,

Paul
Thanks for the response, Paul.
Signal from the lower opamp goes thru the upper opamp and gets it's pole. Ideally would be, when the lower opamp has no pole, but in reality it is impossible. Lower opamp needs a capacitance shunt in feedback for the stability in real conditions. Maybe the 220pF capacitance can be lowered.
The overall measured result is very good (almost perfect), and one of the main advantages is that the both opamps run in the inverted mode when the distortion figures are low as possible.

All the best,
Victor.

Last edited by vicnic; 10th February 2018 at 05:49 PM.
  Reply With Quote
Old 11th February 2018, 06:45 AM   #223
vacuphile is offline vacuphile  Netherlands
diyAudio Member
 
vacuphile's Avatar
 
Join Date: Apr 2011
Location: Seaside
Thank for your quick response Victor.

I'll post results as soon as the soldering iron has cooled down.

Paul
__________________
All atoms to the right!
  Reply With Quote
Old 13th February 2018, 07:24 PM   #224
TypodCrow is offline TypodCrow
diyAudio Member
 
Join Date: Dec 2017
Quote:
Originally Posted by DRONE7 View Post
Listening now.

First impressions... I am quite surprised... My Diyinhk 9018k2m with 3x custom power supplies is bested by this 9038q2m using a single 15+-0-15- supply. (plenty of opportunity here for upgrading )

It does not have the 'clinical' presentation I associate with ESS chips... and seems warmer and fuller yet without sacrificing detail.
Resolution and soundstage is noticeably better than the 9018k2m .

I have wired a 50k audio taper pot and can adjust volume. Not a big range but enough to use as a 'digital controller' direct to a power amp.
Using a rotary switch to change inputs. No switching noises ! Very smooth operation.

Will try switching filters next but can't see the need really. Who changes filter on a track by track basis? .
I would rather listen to one for a week then try another and eventually settle on a preferred filter then leave it jumpered.

Inputs tested ...Usb to i2s, optical, and coax all work.

Downsides ?
... so far no direct i2s driver to be found..:-(
I am using a usb to i2s (raspberry pi player) interface and this works ok mostly... lock not achieved unless the dac is switched on while the Pi boots. If it is on first the Pi does not recognise it.

If anyone finds a dtoverlay for this I would be most interested...
Is there any way you'd be able to compare it with an Odac? or a Dac1/Dac2/Dac3? And do you/anyone here have measurements for this DAC board? I'd like to purchase but I would like a truly reference/studio grade dac for cheap (ie. <+/0.1db freq response, very low noise, etc.)
  Reply With Quote
Old 14th February 2018, 07:30 AM   #225
vacuphile is offline vacuphile  Netherlands
diyAudio Member
 
vacuphile's Avatar
 
Join Date: Apr 2011
Location: Seaside
Quote:
Originally Posted by TypodCrow View Post
And do you/anyone here have measurements for this DAC board? I'd like to purchase but I would like a truly reference/studio grade dac for cheap (ie. <+/0.1db freq response, very low noise, etc.)
Standard, it measures a bit disappointing, mainly 3rd order, but still pretty good. Modded, it should be really good. Victor showed measurements. I am working on a board now and will show pictures and results when done.
__________________
All atoms to the right!
  Reply With Quote
Old 14th February 2018, 02:25 PM   #226
TypodCrow is offline TypodCrow
diyAudio Member
 
Join Date: Dec 2017
That would be greatly appreciated!!
  Reply With Quote
Old 18th February 2018, 09:50 PM   #227
zek is offline zek
diyAudio Member
 
zek's Avatar
 
Join Date: Aug 2003
Did anyone try - Topping D10?
D10 - TOPPING
  Reply With Quote
Old 5th March 2018, 05:46 PM   #228
Virpi is offline Virpi
diyAudio Member
 
Join Date: Jun 2017
Hi, I just purchased the X4000 doc from Dealextreme in the US for 42 incl shipping to the uk. I attached it to a RPI3 loaded it with volumio2 and it worked first time. I was unable to try it with Moode 4.0 as I don't have any IT technical skills to make the image (can anyone help please if I supply an sd card ?!!!) but can honestly say it sounds fantastic playing through an arcam a19 and spender s3/5r.
  Reply With Quote
Old 5th March 2018, 07:04 PM   #229
zek is offline zek
diyAudio Member
 
zek's Avatar
 
Join Date: Aug 2003
Quote:
Originally Posted by Virpi View Post
Hi, I just purchased the X4000 doc from Dealextreme .....
Did you mean SupTronics X4000 Expansion Board for Raspberry Pi 3?
  Reply With Quote
Old 6th March 2018, 09:26 PM   #230
Virpi is offline Virpi
diyAudio Member
 
Join Date: Jun 2017
Yes that’s the one.It appears to be the same unit as the st4000 hdmi dac that is sold by audiophonics in France. I had previously used the iq audio pidac+ pro. The x4000 beats it comfortably.
  Reply With Quote

Reply


Chinese ES9018K2M I2S DACHide this!Advertise here!
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
My DIY ES9018K2M DAC cctv628 Digital Line Level 27 13th May 2017 03:16 PM
ES9018K2M dualmono dac boards heartwinter Swap Meet 3 30th December 2015 10:46 AM
ES9018K2M dualmono dac boards heartwinter Swap Meet 3 16th June 2015 03:40 PM
RPi B+ and ES9018K2M DAC: can't get it to work! Feddo Digital Line Level 0 18th April 2015 01:41 PM
ES9018K2M DUALMONO DAC PCBS FOR SALE heartwinter Vendor's Bazaar 1 8th October 2014 03:12 AM


New To Site? Need Help?

All times are GMT. The time now is 02:46 AM.


Search Engine Optimisation provided by DragonByte SEO (Pro) - vBulletin Mods & Addons Copyright © 2018 DragonByte Technologies Ltd.
Resources saved on this page: MySQL 14.29%
vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2018 DragonByte Technologies Ltd.
Copyright ©1999-2018 diyAudio
Wiki