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.

Questions about an eBay SA9227 DAC from a newbie
Questions about an eBay SA9227 DAC from a newbie
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 15th February 2016, 02:48 AM   #1
VaKo is offline VaKo  United Kingdom
diyAudio Member
 
Join Date: Feb 2016
Default Questions about an eBay SA9227 DAC from a newbie

I'm new to this type of stuff, but you might be able to help me.

I purchased a very cheap SA9227+PCM5102 DAC from eBay sold as a DA3. Nothing special but it was cheap enough to buy on a whim. I had the same issues Takeshi had here, after a few hours of use it would just stop and needed to be removed and re-connected.

After some playing about, I have discovered that the issue appears to be heat. I have identified the chips with the issues here, the chips (mosfets?) circled in yellow get very warm, while the chip circled in white (the sa9227) gets blazing hot to the point that I can't touch it. I've a affected a repair by attaching some copper Raspberry Pi heatsinks to all 3 chips, and a 4th heatsink to the PCB under the SA9227, and this (combined with running it outside the case) seems to have fixed the heat issue and maybe improved the sound quality slightly.

So my question is, is this level of heat output normal with these electronics (and the unit not designed to cope with it) or have I just extended the life of something which is at best half way to dead?

Lastly, if I wanted to replace this with something which does kinda the same thing (USB in, RCA out, works with Windows 10) what would you recommend as a known good option? I don't mind Aliexpress and a bit of soldering.

Last edited by VaKo; 15th February 2016 at 03:02 AM.
  Reply With Quote
Old 15th February 2016, 04:16 AM   #2
abraxalito is offline abraxalito  United Kingdom
diyAudio Member
 
abraxalito's Avatar
 
Join Date: Sep 2007
Location: Hangzhou - Marco Polo's 'most beautiful city'. 700yrs is a long time though...
Send a message via Yahoo to abraxalito
The datasheet I was able to find for the Savitech SA9227 USB interface made no mention of supply current or supply voltage so I've not been able to verify if the part is designed to run hot or not. My instinct says not so this makes me wonder if the wrong voltage regulator has been fitted to your board.

The parts you've circled in yellow are most probably the voltage regulators - if you have a voltmeter it would be a good idea to check the voltage on each of the three pins of each.

Measure the voltage relative to the screen terminals of the output RCA sockets btw.
__________________
I know you think you understand what you thought I said but I'm not sure you realize that what you heard is not what I meant - Alan Greenspan

Last edited by abraxalito; 15th February 2016 at 04:19 AM.
  Reply With Quote
Old 15th February 2016, 12:30 PM   #3
VaKo is offline VaKo  United Kingdom
diyAudio Member
 
Join Date: Feb 2016
The highest voltage would be about 4.8v
  Reply With Quote
Old 16th February 2016, 01:16 AM   #4
VaKo is offline VaKo  United Kingdom
diyAudio Member
 
Join Date: Feb 2016
The magic smoke escaped. On to the next one.
  Reply With Quote
Old 16th February 2016, 01:35 AM   #5
abraxalito is offline abraxalito  United Kingdom
diyAudio Member
 
abraxalito's Avatar
 
Join Date: Sep 2007
Location: Hangzhou - Marco Polo's 'most beautiful city'. 700yrs is a long time though...
Send a message via Yahoo to abraxalito
While I was searching for any other examples of overheating of this chip, I did find one Taobao DAC where the SA9227 has a heatsink on top. But also several without.

Suggest you look for a DAC with the Tenor USB interface - its not high speed but it certainly runs fairly cool. No idea if that's Win10 compatible but on Win7 I had no problems with a TE7022 based adaptor. Something like this - 24 BIT 96K USB DAC Headset Amp TE7022+CS4398+OPA2132 Headphone Amplifier Board-in Amplifier from Consumer Electronics on Aliexpress.com | Alibaba Group
__________________
I know you think you understand what you thought I said but I'm not sure you realize that what you heard is not what I meant - Alan Greenspan
  Reply With Quote
Old 12th January 2018, 08:36 PM   #6
mroboto is offline mroboto  Canada
diyAudio Member
 
Join Date: Jan 2018
Hello everyone,

I bought this DAC recently and had the DAC frequently stop working symptom.

I removed the case and used it directly on the floor for a few days, and he didn't stop working, but touching the SA9227 chip, feels hot !

I found two possible fix.

1. Install an 10x10x10mm heat sink on the SA9227 chip

2. And thats where this is interesting, awaiting for heatsink to come, I had some parts in hands to start to modify it , so I started there.

I installed a 0.1uf 100V ceramic disc cap to the left pins 1&2 of the left AMS1117 regulator that seems to lead to the SA9227 chip. Now the SA9227

Also installed a 10uf 50V multilayer ceramic cap to the left pins 1&2 of the right AMS1117 regulator that seems to lead to the PCM5102A DAC chip.

The bypass cap added for the PCM5102A DAC chip supply may improve the quality of sound by providing a cleaner curent, but the one added for the SA9227 may also help reduce heat of the SA9227 chip.

Listened it for a few days without the case, sometimes I touched the chip and is moderately warm compared to before.

Now I put the case back on, pluged it and listened it all day long yesterday, leaved it plugged for the night, and listened today, no cut off at all.

To improve the sound quality even more, I replaced the electrolytic 10uf output caps by Wima MKS2 10uf 50V

I think that if he continues to work without cutting out, I will not have obligation to stick an heatsink on the SA9227 chip.

I take some pictures:

Clic on the link at the right of "Document Joint" to see full sized pictures

IMG-2075.JPG

IMG-2080.JPG

IMG-2081.JPG

IMG-2082.JPG

This DAC sounds pretty good with the mods I done.

Hope this helps people who have problems with this DAC and/or want to improve it.
  Reply With Quote
Old 17th January 2018, 07:45 PM   #7
mroboto is offline mroboto  Canada
diyAudio Member
 
Join Date: Jan 2018
He do not stop to work anymore after additions of the ceramic bypass caps, even when the case become slightly warm after very long uses. I recently also added a 0.1uf 50V ceramic disc cap to the 5V USB input to have cleaner input. IMG-2083.jpg
  Reply With Quote
Old 1st March 2018, 12:36 PM   #8
mroboto is offline mroboto  Canada
diyAudio Member
 
Join Date: Jan 2018
In one month and a half, he freezed once,

So I decided to replace the 0.1uf ceramic disc I added to the SA9227 regulator (the left one) , with a 4.7uf multilayer ceramic cap.

And I also replaced the 0.1uf ceramic disc I previously added to 5V input with a 2.2uf multilayer ceramic cap.

If the problem is not completely solved with that, I will install the heatsink on the SA9227 chip as I previously said, I hope I will not have to do that, because I want to see the chip, not hidden under a heatsink, for future reference.

Last edited by mroboto; 1st March 2018 at 12:45 PM.
  Reply With Quote
Old 1st March 2018, 09:29 PM   #9
phase is offline phase  United States
diyAudio Member
 
Join Date: Oct 2004
I have an sa9227 and it doesn’t run hot, but it’s in more of an open frame with a fan on the entire dac/headamp.
I can’t imagine how those kit DACs would work very well in a closed case, mine gets warm enough to overheat a bit just without the fan on.

Edit; mine is an sa9223, not sure if that was a monumental upgrade or not.

Last edited by phase; 1st March 2018 at 09:34 PM.
  Reply With Quote
Old 2nd March 2018, 09:31 AM   #10
mroboto is offline mroboto  Canada
diyAudio Member
 
Join Date: Jan 2018
You probably meant a SA9023 not SA9223 ?

SA9023 is not asynchronous
  Reply With Quote

Reply


Questions about an eBay SA9227 DAC from a newbieHide 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
Driver for 24bit192K AK4399 + SA9227 + NE5534 DAC USB decoder board Migo Digital Line Level 4 18th January 2016 04:57 PM
Newbie questions; Fresh CD player or just a DAC? Bare Digital Source 34 27th November 2015 12:14 PM
Driver stage to finals newbie questions - (I hope not dumb questions) rongon Tubes / Valves 15 13th June 2011 08:29 PM
CDP (Micromega) DAC/output upgrade (newbie questions) R79 Digital Source 0 24th March 2005 07:50 PM
Newbie questions about DAC lobo Digital Source 1 13th February 2004 06:29 PM


New To Site? Need Help?

All times are GMT. The time now is 12:26 PM.


Search Engine Optimisation provided by DragonByte SEO (Pro) - vBulletin Mods & Addons Copyright © 2018 DragonByte Technologies Ltd.
Resources saved on this page: MySQL 15.00%
vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2018 DragonByte Technologies Ltd.
Copyright ©1999-2018 diyAudio
Wiki