Tda1547 + Sm5803 + Hef4750 Studer - diyAudio
Go Back   Home > Forums > Source & Line > Digital Source

Digital Source Digital Players and Recorders: CD , SACD , Tape, Memory Card, 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 9th March 2005, 09:39 PM   #1
cdfr is offline cdfr  United States
diyAudio Member
 
Join Date: Jan 2005
Location: Seattle
Default Tda1547 + Sm5803 + Hef4750 Studer

Hi,

Trying to see if improvements can be made to a Studer D730. For instance I am wondering if clock signal could be improved.

Would anybody have the Studer D730 Service Manual?

The set of chips in the D730 are:
Xtal 11.2896 + Philips HEF4750UD (wondeing if this chips helps regarding jitter).
Digital filter: NPC SM5803APT
DAC: TDA1547
Analogue section: 7x 5532 and output trasformers.

cd
  Reply With Quote
Old 10th March 2005, 05:34 AM   #2
mb is offline mb
diyAudio Member
 
Join Date: Dec 2002
Location: Singapore
I've found the TDA1547 very responsive to improvements in power supply. Almost every improvement to supply (eg. good film bypass cap, Ocson for digital supply cap, etc) is rewarded with improvement in sound. So my experience is that op2134 and lm6172 work well with the dac. Even with improved power supply for the opamps, the ne5532 just doesn't deliver the transparency available from the 1547 output.
  Reply With Quote
Old 10th March 2005, 07:18 AM   #3
diyAudio Member
 
Join Date: Dec 2001
Location: Eindhoven
Default Re: Tda1547 + Sm5803 + Hef4750 Studer

Quote:
Originally posted by cdfr
Hi,

Trying to see if improvements can be made to a Studer D730. For instance I am wondering if clock signal could be improved.

Would anybody have the Studer D730 Service Manual?

The set of chips in the D730 are:
Xtal 11.2896 + Philips HEF4750UD (wondeing if this chips helps regarding jitter).
Digital filter: NPC SM5803APT
DAC: TDA1547
Analogue section: 7x 5532 and output trasformers.

cd

Hi

The 4750 is a sampling phase comparator, which potentially works very good, but finally the jitter depends on the oscillator structure and power supply.

The 1547 reacts very positively on a real low jitter clock at the inputs pin 5 an pin 28.

Studer generally makes well designed equipment, not always most audiophile though

best regards
__________________
Guido Tent
www.Tentlabs.com
  Reply With Quote
Old 11th March 2005, 09:12 PM   #4
cdfr is offline cdfr  United States
diyAudio Member
 
Join Date: Jan 2005
Location: Seattle
Indeed in general Studer products are well build. You can sse here if you are curious the Power/DAC/Analog board.

It seems that there are two paths possible to follow:
1) OP amp changes 5532 to AD825 or BB2134 or 2132. Probably best to add sockets to make trials.

2) Replacing crystal by higher quality low jitter clock. Would you have a recommendation or a schematic?

and third path would be caps upgrade, I am assuming though those would have less effect than first 2.

Thanks,

cd
Attached Images
File Type: jpg d730s2.jpg (94.0 KB, 1040 views)
  Reply With Quote
Old 13th March 2005, 07:43 PM   #5
diyAudio Member
 
Join Date: Dec 2001
Location: Eindhoven
Quote:
Originally posted by cdfr
Indeed in general Studer products are well build. You can sse here if you are curious the Power/DAC/Analog board.

It seems that there are two paths possible to follow:
1) OP amp changes 5532 to AD825 or BB2134 or 2132. Probably best to add sockets to make trials.

2) Replacing crystal by higher quality low jitter clock. Would you have a recommendation or a schematic?

and third path would be caps upgrade, I am assuming though those would have less effect than first 2.

Thanks,

cd
Hi

I assume this player can also run at external wordclock (Hence the 4750). If you want to upgrade the clock, it is best to have schematics avalable as you may want to chose to exclude the external wordclock operation (simple upgrade).

There's 2 decent DIY clock solutions on the market that I am aware of, the Kwak clock and my own (TentLabs).

cheers
__________________
Guido Tent
www.Tentlabs.com
  Reply With Quote
Old 2nd April 2005, 09:24 PM   #6
cdfr is offline cdfr  United States
diyAudio Member
 
Join Date: Jan 2005
Location: Seattle
Thanks Guido.
Indeed it has a world clock input, but I don't understand how if unused it would affect the internal clock signal? Is the clock poluted by EMI?

I have not posted a reply in while because I am searching for the service manual (it has the schematics). I have not been able to find one at a reasonnable price yet.
Studer sells one but the pages must be gold platted for the price


cd
  Reply With Quote
Old 3rd April 2005, 08:43 AM   #7
Alien8 is offline Alien8  Belgium
diyAudio Member
 
Join Date: Mar 2004
Location: Leuven
Hi Cdfr

conserning analogue stages, have you thought about bypassing the on-chip I/V opamps ?
My understanding is that they resemble NE5532 types.

My idea is this (TDA1547 in CD950 philips) : see pdf.
First page 'resembles' the situation in my player now. (which I used to simulate)
Second page is my attempt to produce something simpler and hopefully audibly a lot better.
PSU changes are not included there.
Don't mind the current sources for the inputs, these are guessed on the basis of some measurements.

the only problem are the on-chip opamps which are internally connected to the outputs of the dac itself (cfr. datasheet)

Oh, and PSU upgrades indeed do matter a lot, as does guido's clock.

Any thoughts ?

A8

edit : first page included here (schema2.pdf)
Attached Files
File Type: pdf schema2.pdf (68.6 KB, 514 views)
__________________
A8
If 'I' knew what I was doing, life would sure be easier...
  Reply With Quote
Old 3rd April 2005, 08:45 AM   #8
Alien8 is offline Alien8  Belgium
diyAudio Member
 
Join Date: Mar 2004
Location: Leuven
new schematic
(schema.pdf)
Attached Files
File Type: pdf schema.pdf (17.3 KB, 351 views)
__________________
A8
If 'I' knew what I was doing, life would sure be easier...
  Reply With Quote
Old 15th October 2006, 08:01 PM   #9
Gasho is offline Gasho  Croatia
diyAudio Member
 
Gasho's Avatar
 
Join Date: Nov 2004
Location: Zagreb
I have a Studer D731 which is a same player like D730 in rack-mount version. Yours is desktop.

This players are made to play silver discs in most natural way.

It have almost no jitter becouse of special system that adapt clock to one recorded on every disc (every cd is not the same in racorded clock)

Power supplyes in Studer are tuned for most natural sound.

I like to tweak players, and I belive that even the best "audiophile" machines can be tweaked to work better, but this Studer remain untouched by my hand becouse it yust plays natural music.

Even audiophile power chords donīt work on this playe. It work best with standard computer (3X2,5 square mm) IEC cable.

Regards.

P.S. Studer need very well balanced audio system becouse it donīt have some strong caracter of itīs own, and every disbalance in system will be heard like bright or warm sound.
  Reply With Quote
Old 15th October 2006, 08:40 PM   #10
diyAudio Member
 
analog_sa's Avatar
 
Join Date: Aug 2002
Location: Sofia
Quote:
Originally posted by Gasho

This players are made to play silver discs in most natural way.


Hmmm. Perceptions do vary. I used to have a D732 which soundwise was amazingly unremarkable. So much so i didn't even consider modding it. It already had green LEDs shining over the cd anyway
  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
Tda1307,tda1547,opa2604ap uhcmos Swap Meet 2 10th June 2009 12:49 PM
Tda1547 Dac Cobra2 Digital Source 29 29th November 2008 07:07 PM
TDA1547 dac, different versions? VanHal Digital Source 3 11th July 2007 06:07 PM
phillips TDA1547 wanted dan _s Digital Source 3 28th September 2004 09:21 PM
replace tda1547 Mendis Digital Source 0 28th September 2003 07:15 AM


New To Site? Need Help?

All times are GMT. The time now is 11:01 PM.


vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2014 DragonByte Technologies Ltd.
Copyright Đ1999-2014 diyAudio

Content Relevant URLs by vBSEO 3.3.2