Build thread for ES9023 + JG Buffer boards (betatest) - Page 17 - diyAudio
Go Back   Home > Forums > Source & Line > Digital Line Level

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

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 16th September 2013, 01:53 PM   #161
diyAudio Member
 
Join Date: Aug 2010
Nothing really special! Based on this notes I replaced R2 with a low noise 13V Zener for +/-15V (actually +/-14,25V) and two green LEDs for 5V and try to have a good layout wrt ground. Pots R8-R10 are optional!
Attached Images
File Type: jpg Schematic.jpg (153.5 KB, 760 views)

Last edited by curryman; 16th September 2013 at 01:56 PM.
  Reply With Quote
Old 18th September 2013, 04:35 AM   #162
Boomer2 is offline Boomer2  Canada
diyAudio Member
 
Join Date: Jan 2010
Thanks @mull3t and @curryman. Great info. Simple is good. I'll wait for your testing on the Traco SMPS.

@curryman: What are the current max load consumption values for the Buffer and DAC? I'm pumping numbers into the Salsa BiB calculator to see I can understand that build just in case I go that route before the GB closes.

Cheers
  Reply With Quote
Old 18th September 2013, 10:06 AM   #163
diyAudio Member
 
Join Date: Aug 2010
You'd need max. 65mA for the 5V supply and max. 35mA per Rail for the buffer supply. The buffer current depends on the properties of the actual Fets used but with 35mA you are quite save. You might want to add some for the shunt but I wouldn't go too high

Please find attached the Filter for the Traco SMPS Joachim tested.

regards, Daniel
Attached Images
File Type: jpg Traco Filter.jpg (104.2 KB, 707 views)
  Reply With Quote
Old 20th September 2013, 01:49 AM   #164
Boomer2 is offline Boomer2  Canada
diyAudio Member
 
Join Date: Jan 2010
Thanks Curryman.
The BiB guide says: "Its good to spare current in the regulators if you have the sinking surface, it enhances the performance. 70-150mA excess on top of max load demand is usual practice for normal operation."
The spreadsheet says: "Constant current sourced by Q101. It should provide at least the current consumption by the load plus some headroom for proper functionning of the shunt reg and peak transitories (with a minimum of 25mA or 20% more than the load as a starting point) YMMV."
Taking your advice to not go too high, I'm going to add the minimum 25mA to both the 65mA and 35mA values which adds roughly 39% and 71% more respectively. The typical 70-150mA excess headroom outlined in the guide sounds like too much based on your comment. Sound right? Much appreciated. Cheers.
  Reply With Quote
Old 24th September 2013, 04:11 PM   #165
diyAudio Member
 
Join Date: Aug 2010
Default Ready to use DAC boards are now available!

@Boomer2: the headroom is subject to quite controversal discussions. I've seen people reporting of amazing improvements using more than 1A of headroom for systems with a max load current of below 100mA. Not sure if I can hear those improvements
The load current of the output buffer is constant so there is no need for a big headroom from a technical point of view. With 50-60mA per rail you'll be on the save side. The 65mA is a max. value and adding 25mA will be more than sufficient here too. "High" current demand e.g. of the XO will be handled by the local decoupling caps anyway (regs are way too slow!).

@ all: I am happy to announce the availability of the ready to use boards. Please have a look into the vendors forum for more info.

Regards, Daniel
  Reply With Quote
Old 12th October 2013, 05:02 PM   #166
Mull3t is offline Mull3t  United States
diyAudio Member
 
Join Date: Apr 2012
Location: Gamehendge
Daniel at al,

I've finally completed building my Curryman 9023! As usual, I'm running into a major issue with muffled and distorted audio and I'm not really sure where to start troubleshooting beyond initial power voltage readings. I'll detail how I have my configuration set up so things are easier to understand...

I'm using 3 power supplies all designed by AMB audio. The model of the supply is the Sigma 25. The first power supply is providing 5v to the DAC board and to an Acko S01 Isolator / Re-clocker board. The supply is connected to a terminal strip which then connects to the two separate boards. I'm reading +5v in to both boards and 3.3v or 3.6v after their respective LDO regulators (DAC, XO, and power for re-clocker board). The other two supplies are connected together to provide +/- 15v for the JG Buffer. I'm getting a reading of +/- 15v for this supply. So it looks like my power is in order.

In my particular configuration I decided to go with a pre-buffer / post-buffer switch. I'm using a DPDT switch that is only taking in the left and right channels of audio. No ground connections. Then my ground connections (all 4) are hooked directly up to my RCA terminals. So I'm not switching GND. Just L/R. This way I only need one set of RCAs.

I'm getting the noise, distortion pre and post buffer so the issue seems to be before the buffer.

The way I set up the XO and re-clocking is this way. I have the XO on board which feeds the re-clocker RCK and then the SDATA, LRCK, and BCK are feeding back into the DAC. So the on-board Clock is acting as reference for the re-clocker.

There are only two things that come to mind to be the issue... either the DAC chip or something is wrong with the re-clocker board.

Any ideas are appreciated.

~Mull3t
  Reply With Quote
Old 12th October 2013, 05:55 PM   #167
Mull3t is offline Mull3t  United States
diyAudio Member
 
Join Date: Apr 2012
Location: Gamehendge
I forgot to mention that I'm using the Amanero (CPLD firmware - Master2224 and 1.074 firmware) as my transport.
  Reply With Quote
Old 12th October 2013, 05:56 PM   #168
diyAudio Member
 
Join Date: Feb 2011
Location: Madison, Wisconsin USA
Default Noise/distortion

same problem when you turn down digital volume level to say 60%? If it clears up [raw out of the DAC no FETs] when you turn down digital gain, that is simple. Leave gain down, or pick different resistor other than the ~200K... ODAC used 118K for instance, on the Vreg? pin? [it's been a while]

And, obviously, try a simple direct I2s source, even something cheap like a Ti PCM270# or TE7022...

I gather you have placed an O-scope on the voltages and taken a peek there?

I have DAC chips for you, but I doubt your fried it. I'm in the USA.
  Reply With Quote
Old 12th October 2013, 08:51 PM   #169
Mull3t is offline Mull3t  United States
diyAudio Member
 
Join Date: Apr 2012
Location: Gamehendge
I'm not at home to test going to a lower digital volume, but it's worth a try. I don't recall what I used for the resistor. I think it was 200k though. The Vreg pin is what R8?

I don't have access to an O scope. Maybe I can scrape one up somewhere. I'm in a work environment that would potentially have one. I do have a DMM so if there's any extra voltages that I should measure that would be helpful.

I do have two extra DAC chips in case. I could have fried it. I accidentally had applied reverse polarity for maybe a minute or so... maybe less. Would haven't my LDOs been fried in the process?
  Reply With Quote
Old 12th October 2013, 10:04 PM   #170
diyAudio Member
 
Join Date: Feb 2011
Location: Madison, Wisconsin USA
I am not up on LDO design, the basic VOM would say if it's outputting something perhaps correctly, but a scope set down on very low AC range would tell you about noise or lack thereof. At least in my old days servicing early 80s gear, a scope would show when the rails were dirty, like a cap out or some sort of unwanted noise, but, it helps to know what is normal ambient noise at a given setting...[looking at the PSU rails] you don't know that.

I would start super super simple, run the DAC at 3.6V [or 3.3 if you have any other simple regulators around], use a simple 4-wire+gnd 16/44.1 whatever I2S source... or your clock on MCK...whatever. Not FETs, no Reclock, no Amanero... [cut the potential problem source in 1/2 basically].

I don't know HOW distorted your audio is. If it cleans up at 60% digital gain then you have a simple problem. If it's rough going no matter what, try JUST the DAC as above?

By the way, I found some cheap ES9023 directly from DIYINHK's site not eBay, I would I could loan you one for testing...they were sub-$20USD and they got shipped air. Sounds like you STARTED with a somewhat elaborate complex mixture of building blocks...which is great, but.

Did you try anything "vanilla" before getting fancy? Or direct jump into deep end of pool? Meaning no offense, I know I like to tinker, plot out the best I know how...

Once when I miswired i2s I had not music really, some remote hint of music but 98% odd noise/hash. Do you hear music but poor quality with some "ripping" and breaks of linearity?? Or REALLY screwed up? I know you seem to have ruled out the buffer.

DO you own any other USB DACs that you can borrow I2s from? Seat of pants I would try like 50r in series with each I2S line...[even if you shorted it it might survive] and carry also your GND over.

Yah that 200-220K if your sound is fine at 50-60% digital gain, try 100K or 120K there. Pin 6 ES9023
See here: http://www.yoyodyneconsulting.ca/dow...AC-release.pdf
  Reply With Quote

Reply


Hide 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
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Fastron Inductor Group Buy for JG Filter Buffer pchw Group Buys 176 8th February 2013 10:19 PM
ES9023 DAC build heartwinter Vendor's Bazaar 8 7th July 2012 10:27 AM
Preamp / buffer suggestions for TA2020 / TA2024 boards lossfound Class D 11 29th January 2012 11:35 AM
ES9023 and buffer before 10K pot. Neutrality Digital Line Level 1 12th December 2011 08:00 PM
DIY Op Amp Buffer Boards aziltz Swap Meet 20 18th October 2011 01:35 AM


New To Site? Need Help?

All times are GMT. The time now is 02:30 PM.


vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2014 DragonByte Technologies Ltd.
Copyright 1999-2014 diyAudio

Content Relevant URLs by vBSEO 3.3.2