Inside Sony AVD-S10 - diyAudio
Go Back   Home > Forums > Amplifiers > Class D

Class D Switching Power Amplifiers and Power D/A conversion

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 14th November 2004, 11:14 AM   #1
diyAudio Member
 
Join Date: Nov 2002
Location: HK
Default Inside Sony AVD-S10

Hi all,
Here is some Sony S-master pic. I am thinking of modding, mostly just changing caps. Any advise is welcomed. Thanks
Attached Images
File Type: jpg avd-s10 whole.jpg (93.2 KB, 862 views)
  Reply With Quote
Old 14th November 2004, 11:15 AM   #2
diyAudio Member
 
Join Date: Nov 2002
Location: HK
The power supply.
Attached Images
File Type: jpg avd-s10 ps.jpg (93.5 KB, 716 views)
  Reply With Quote
Old 14th November 2004, 11:37 AM   #3
diyAudio Member
 
Join Date: Nov 2002
Location: HK
The amp stage with S-Master
1st stage is CXD9634.
2nd stage is CXD9646.
And large coil and caps for the LPF.
Attached Images
File Type: jpg avd-s10 s-master1.jpg (92.9 KB, 707 views)
  Reply With Quote
Old 14th November 2004, 11:38 AM   #4
JohnW is offline JohnW  Hong Kong
diyAudio Member
 
JohnW's Avatar
 
Join Date: Jan 2004
Location: Discovery Bay, Prague, Paris...
Hi ChuckT,

I wouldn’t change the caps in the PSU unless you know what your doing – SMPS require Low ESR caps, and changing types / values could upset the Feedback loop.

However the caps on the Amplifier board could benefit from improvement.

1. Increase C313 (main HBridge supply) leave the existing cap on the PCB, but add an external larger part (can be fitted across the connecter CN300

2. Fit OSCON’s in positions, C312, C301, C326, C336, C350, C388, C392, C325, C320, C329

There’s a guy selling bags of OSCON caps on a stand in Sham Shui Po (electronics market) for HK$1 each!

Buy the 470uF 6V3 and fit in the above position (where the voltage rating will allow).

The PCB is very poorly design (very poor ground plane & terrible HF decoupling), but the above modifications will improve the audio quality.

The S-master modulator can achieve a dynamic range of just shy of –120dB; it’s not a bad design.

We should go for drink one evening in Wan Chai,

John
__________________
Life shouldn't be taken too seriously as at the end of the day you will not come out of it alive anyway…
  Reply With Quote
Old 14th November 2004, 11:38 AM   #5
diyAudio Member
 
Join Date: Nov 2002
Location: HK
CXD9646
Attached Images
File Type: jpg avd-s10 smaster2.jpg (82.0 KB, 690 views)
  Reply With Quote
Old 14th November 2004, 11:46 AM   #6
diyAudio Member
 
Join Date: Nov 2002
Location: HK
Wow, that was a quick reply. And from HK too.
Thanks, I know it is not wise to mod a SMPS. I normally just replace the last cap in the output.
Do you have a schematics?
Yes, I am alway happy to meet a local fellow moder.
PM me and we'll discuss.

I have a lot of Oscon in my box, so really I can start immediately.
What values do you recommend to replay the 100uf/10V.
Actually, I just got this gear yesterday.
  Reply With Quote
Old 14th November 2004, 11:50 AM   #7
diyAudio Member
 
Join Date: Nov 2002
Location: HK
Ops, read too fast.
I don't have 470uf/6.3v. The max I have is 150uf/16v.
There are various values, I am not sure using such a high cap value is a good idea.
  Reply With Quote
Old 14th November 2004, 12:02 PM   #8
JohnW is offline JohnW  Hong Kong
diyAudio Member
 
JohnW's Avatar
 
Join Date: Jan 2004
Location: Discovery Bay, Prague, Paris...
Hi ChuckT,

No problem to fit as large (Oscon) cap as you can, although there physcial size will be the limiting factor. The LV regulators are very noisy (on the Clock and digital supplies around the modulators), the larger caps well help reduce this.

The output devices are "badged" Sankan devices, and the modulators are Fab. by Renisis (Ex Mitsubishi).

I'm sorry I don't have the circuit diagram, I bought a unit to Eval. the modulator (Sony DAV-S400, which appears to be very similar apart from the Video IO / Audio IO / Tuner Bd).

John
__________________
Life shouldn't be taken too seriously as at the end of the day you will not come out of it alive anyway…
  Reply With Quote
Old 15th November 2004, 04:36 PM   #9
diyAudio Member
 
Join Date: Nov 2002
Location: HK
Hi John,

What's with all the shielding.
There are 2 copper shield under the amp board and shields around the 8 coils.
The small shield under the amp board cover the crystal the 2 s-master chips. The large one covers half the underside (not shown in pic).
Attached Images
File Type: jpg avd-s10 amp underside.jpg (97.3 KB, 555 views)
  Reply With Quote
Old 15th November 2004, 04:42 PM   #10
diyAudio Member
 
Join Date: Nov 2002
Location: HK
Here is modded pic, only the front 2 channel caps are changed. BG hi-q for the cxd9634 and pana fc, Oscon for the power chip.
I wonder if replacing the brownish red caps (mkt?) with small BG hi-q is a good idea.
Attached Images
File Type: jpg avd-s10 amp mod.jpg (84.8 KB, 546 views)
  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
Sony CDP-337ESD v Sony CDP-X33ES which is best? eldarvanyar Digital Source 0 10th January 2008 11:04 AM


New To Site? Need Help?

All times are GMT. The time now is 04:46 AM.


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