Ultimate Twin TDA1541a Non-oversampling DAC with tube buffer & reclock set....... - Page 3 - diyAudio
Go Back   Home > Forums > Commercial Sector > Vendor Forums > Vendor's Bazaar

Vendor's Bazaar Commercial Vendors large & small hawking their wares

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 27th April 2005, 11:08 AM   #21
kiyull is offline kiyull  South Korea
diyAudio Member
 
Join Date: Nov 2004
Location: Korea
Default Re: Ultimate Twin TDA1541a Non-oversampling DAC with tube buffer & reclock set...........

Quote:
Originally posted by tube-lover
Dear kiyull ,

I was packing the DAC. Pls let me know how long was the digital cable for I2S that U need. I will free to post longer digital cable to U. will caontain three canle. One is gotham, one is aes digital cable & one is junkosha for U. Is U can supply useful information for diyers to improve my DAC or coming others diyers design in diy world. I don't care lost a little bit money for experience.


Pls le me know asap.

I will prepare for U.


thx

thomas

Dear Thomas, thanks your kind assistance. Using as a standalone DAC with I2S conection , I guess, the shortest length may be 30 cm between two connectors for direct connection without any additional connectors. However, I think there should be one connector at least for convenience. Rememer that there are 4 lines for I2S.
I am attiching a figure to assist your understand.
The cable length is less than 10cm in my current CD Player as shown above post. But as you know, it is so crowded and I lost something (additional vibration or so(not sure))

Regards,
Kiyull
Attached Images
File Type: gif i2s.gif (5.1 KB, 4529 views)
  Reply With Quote
Old 27th April 2005, 12:38 PM   #22
Bricolo is offline Bricolo  France
diyAudio Member
 
Bricolo's Avatar
 
Join Date: Nov 2002
Location: Grenoble, FR
you could even place the cable vertically

a connector at the bottom of the transport
the other at the top of the dac
__________________
Just remember: in theory there's no difference between theory and practice. But in practice it usually is quite a bit difference... Bob Pease
  Reply With Quote
Old 27th April 2005, 09:08 PM   #23
jimng is offline jimng  Singapore
diyAudio Member
 
Join Date: Apr 2005
Location: City
Hi Thomas,

Where can we get this kit in Hong Kong ? Any contact number or shop I can go to ?

Regards, Jim
  Reply With Quote
Old 27th April 2005, 09:40 PM   #24
diyAudio Member
 
Join Date: Nov 2003
Location: Deep inside the Silicon Furnace
Quote:
Originally posted by kiyull


Hi Finney,

Our new design will be focused on suspension of cd module and transformer etc.
Primary test from one of my friend reveals that the extensive suspension of transformer and cd mechanism (in commercial cd player, not CD-PRO2) gives great improvement of sound quality. Therefore we are going to apply this to CD-PRO2 module which can replace the original spring and rubber suspension.

Following is my cd-pro2 with dual 1541A S2 with I2s connection :
http://www.diyaudio.com/forums/showt...674#post583674

Mine is too crowded : We are going to separate by two for player : CD-PRO2 with DAC(thomas) plus tube buffer with P/S, What do you think about the length of I2S cable? Is it possible to lengthen the cable about 30-40cm? If possible we would like to make standalone transport and standalone DAC.

Thank you in advance for any idea about I2S cable.

Kiyull
Hi Kiyull

CD-PRO2's suspension is pretty much useless. It will only do bad to the module. My temp fix is to put a layer of sorbothane pad under the 4 legs. If you can find any better solution, please do let me know about it. As for transformers, I simply put sorbothane under them, too.

I2S signal can not go very far. I will say 15cm is the limit. You may stretch it to 30cm but the signal quality will be doubtful. One trick is to put a reclocking module between the DAC and CD-PRO2 which can also serve like a repeater, still, I do not think putting CD-PRO2 and DAC in two boxes is a good idea. It's better to put power supply to another box instead.

As for the cable, pure silver wire with correct shielding is great. Even Giga-bit network cable works OK. The main issue is the connector. I will definitelt solder the wires to the board directly, if possible.

Your CD-PRO2 is impressive! What's the board for on the right hand side, right beside/under the CDPRO2 module? Is it the power supply for the DAC? I also notice that you use OS-Con polymer caps on the DAC. Neat! I use NCC's PSA for Thomas'es DAC instead. Are those 1541 decoupling caps PIO caps? How do them sound, when compared to PP caps?

Thanks.


-finney
  Reply With Quote
Old 28th April 2005, 02:28 AM   #25
kiyull is offline kiyull  South Korea
diyAudio Member
 
Join Date: Nov 2004
Location: Korea
Quote:
Originally posted by finneybear


Hi Kiyull

I2S signal can not go very far. I will say 15cm is the limit. You may stretch it to 30cm but the signal quality will be doubtful. One trick is to put a reclocking module between the DAC and CD-PRO2 which can also serve like a repeater, still, I do not think putting CD-PRO2 and DAC in two boxes is a good idea. It's better to put power supply to another box instead.


Your CD-PRO2 is impressive! What's the board for on the right hand side, right beside/under the CDPRO2 module? Is it the power supply for the DAC? I also notice that you use OS-Con polymer caps on the DAC. Neat! I use NCC's PSA for Thomas'es DAC instead. Are those 1541 decoupling caps PIO caps? How do them sound, when compared to PP caps?

Thanks.


-finney
Hi Finney,
Thank you for your advice for the suspension and cable length. One guy in here is making hand-made tone arm and turn-table etc. He may get some good results, hopingly.

What do you think about the treatment of Elso? : http://www.diyaudio.com/forums/showt...059#post378059 . I am going to try this first.
Anyway I agree with your two boxes configuration.

The board you mentioned is dual PS for each TDA1541 : this was from the idea of Danny : http://www.audioasylum.com/forums/tu...ges/36367.html
The caps are Russian PIO on Ebay years ago, and the sound was softer than Philips PP though somebody did not recommand those cap for decoupling. I replaced PIO to PP , but I returned immediately, Probably I have to age PP first, but my first impression for the PIO was not bad.

Tube rectifier and WE-417 with CCS enhanced sound quality too : I tried 6dj8, 5842 and 6c45pi too.
Maybe I did not get optimum solution with tubes since I am not expert in this field.

Since the sound of my Cd-Pro2 with Non-OS Dual 1541 (double crown) was not bad, a few of my friends who are using very high-end system including analog LP source (of course, they are not not diyer) are interested in my CD player. I am in charge of building (electronic part) a few of CD players.


thanks again,

Kiyull
  Reply With Quote
Old 28th April 2005, 03:59 AM   #26
Coulomb is offline Coulomb  England
diyAudio Member
 
Coulomb's Avatar
 
Join Date: Jul 2002
Location: Ancaster, Ontario
Thomas other than different types of Components, what is the functional differences between Version 1 and Version 2 of t you DAC?

Anthony
__________________
I like to stay current!
  Reply With Quote
Old 28th April 2005, 06:17 PM   #27
diyAudio Member
 
Join Date: Jul 2004
Location: Hong Kong
Talking Ultimate Twin TDA1541a Non-oversampling DAC with tube buffer & reclock set...........

Dear Finney, Kiyull & Jonathan D,

your three parcel were all posted already in this afternoon. By EMS,

Finney--EE671169709hk.
Kiyull--EE671169765hk.
Jonathan D--EE671169757hk.

Pls all preare two 82ohm resisters for connect betweeen the DAC & the Opa2604 PCB. THis resisters was for adjust the signal from 1541a to 2604pcb. I forgot to put into the parcel. I will use small letter post back to U.

The parcel totally contain 5 cables.
three digital cables.

one Gotham 10070 silver digital cable.
one Junkosha ultra-fast speed silver digital cable.
one professional AES/EBS digital cable.

one ATM KA Mic cable for rca output from 2604 PCB.
one Belden silver plated RCA cable for rca output from 2604 PCB.

U will all get a standard XO on the small parts bags for test the clock.

Finney & Kiyull contain TCXO too.

Pls let me know when parcel arrived.

thx

thomas
  Reply With Quote
Old 28th April 2005, 06:21 PM   #28
Coulomb is offline Coulomb  England
diyAudio Member
 
Coulomb's Avatar
 
Join Date: Jul 2002
Location: Ancaster, Ontario
Thomas any answer for me?

Anthony
__________________
I like to stay current!
  Reply With Quote
Old 29th April 2005, 12:18 AM   #29
diyAudio Member
 
Join Date: Nov 2003
Location: Deep inside the Silicon Furnace
Quote:
Originally posted by kiyull


Hi Finney,
Thank you for your advice for the suspension and cable length. One guy in here is making hand-made tone arm and turn-table etc. He may get some good results, hopingly.

...

Hi Kiyull

It will be great if your friend can come out some good solution. We need something rigid enough yet with a good Q value to damp the vibration.

Have you replaced the XO? Also most parts used on CD-PRO2 are of very low quality, industrial grade parts. Try to replace those e-caps with OS-Con SVPs. You will be amazed to hear the difference.

Be honest to you, I do not feel Elso's circuit is a good idea. First of all, 2N4401's bandwidth is still a bit low. I2S does not have any error correction capability, to run for 70cm, differential line will be the way to go. The interface design will become very complex. In this case, probably I will just go for SPDIF!

Those PIO caps looked familiar to me hence the question. I also got lots of ex-Soviet PIO caps from eBay, probably from the same guy? The silver mica caps he's selling are very good, too. I still feel PP caps are the way to go for those decoupling caps due to its better HF performance. Those caps are the by-passing caps for the 6 small 2bit DACs per channel running in the DEM (dynamic element matching) config. The decoupling caps have to remove the HF switching noises as well as supply immediate current. This is why you can not make the caps too big; this will ruin the resolution; they can not be too small either, you will lose the dynamics. My current solution is to use 0.1uf PP || 0.01uf PP for the lowest 2 caps. 0.1uf PP || 0.1uf PP for the mid 2 caps, BG NX .47uf || 0.01uf PP for the upper 3 caps. Still, your finding with PIO is very interesting. Good to know it has a soft and smooth sound. I will try your setup some time.

I also use two 1541 S2 on the DAC. The +-18V is provided by a separate board. I will post the photos soon.


-finney
  Reply With Quote
Old 29th April 2005, 12:28 AM   #30
diyAudio Member
 
Join Date: Nov 2003
Location: Deep inside the Silicon Furnace
Quote:
Originally posted by Coulomb
Thomas any answer for me?

Anthony

Hi Anthony

Probably I can answer this for Thomas. The changes are mainly minor fixes. Better layouts, better part spacing, etc. An OPA627 active buffer is added. The AD844 board is replaced by a OPA2604 solution. A re-clocking board is added in. Sure, I think the biggest difference is the choices of parts. Thomas has learned a lot from Version 1. I also shard a bit of my experiences with him on Ver.1. You can refer to prior posts for the list of part changes.

The main DAC board comes in fully assembled this time. You can still swap the parts if you want to.

-finney
  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
Twin TDA1541A Tube DAC DUC985 Swap Meet 3 13th March 2007 08:54 AM


New To Site? Need Help?

All times are GMT. The time now is 12:30 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