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 8th April 2003, 07:30 PM   #1
diyAudio Member
 
Join Date: Dec 2001
Location: Avalon
Default Jukka's JT-DAC No. 3

Has anyone else built this DAC????
I just finished it last night and am really impressed with it. It sounds very good. Its a few yrs old but sounds great!! Presently im using the 75 ohm input and coax outputs. One of these days Ill build the tube output stage.

http://www.megabaud.fi/~jtolonen/projects/projects.html


Anyone else listening to this DAC???

Thanks,
Tom
__________________
In The Days Before Rock 'n ' Roll
  Reply With Quote
Old 8th April 2003, 10:53 PM   #2
Banned
 
Join Date: Feb 2002
Location: As far from the NOSsers as possible
Default No, but.......

There is a link to an article on jitter by Bob Katz. I urge everyone to read it.

That goes double for all the people who don't understand why I think the AES/EBU interface is poor.

Jocko
  Reply With Quote
Old 8th April 2003, 11:39 PM   #3
diyAudio Senior Member
 
fdegrove's Avatar
 
Join Date: Aug 2002
Location: Belgium
Default EVERYTHING IS WRONG ABOUT IT...

Hi,

Quote:
That goes double for all the people who don't understand why I think the AES/EBU interface is poor.
What's to understand? One big transmission line ***** up?

Don't expect them to understand Jocko, just forge ahead.
__________________
Frank
  Reply With Quote
Old 11th April 2003, 03:29 PM   #4
A 8 is offline A 8  Sweden
diyAudio Member
 
Join Date: Mar 2003
Location: Gothenburg
raincheck,

Considering the comments so far I think you might be able to improve it further....

For a reason I dont understand Jukko re-clocks the wordclock going to the dac chips, I assume his thinking was to reduce jitter when the dac chip triggers analog out.

Read the PCM1702 datasheet page 6 and 7 under "digital input" you'll find that this chip uses the bitclock to trigger analog out, the wordclock triggers the series-> parallel register change... the data then sits there for 4 bitclock cycles and THEN goes analog.

So you could just let LE go directly to the dac chips and route the bit clock through IC27B the same way LE and if your clock source and distribution is good enough (low jitter) your dac will sound even better
  Reply With Quote
Old 11th April 2003, 04:57 PM   #5
diyAudio Member
 
Join Date: Dec 2001
Location: Avalon
Thanks so much for advice!!! Ill have to read up.
I still cant believe that nobody has built this dac before.. My system includes modified PS Audio Lambda transport , dynaudio speakers and a Bride of Zen Preamp......
This DAC kicks ***!! It sounds very very good. Im really impressed with it..


If no one admits to building this dac how bout some comments on pcm1702 vs newer dacs??

Everything can be improved(better oscillators, tube output stage, I2S, etc...) but Im really blown away how good this JT dac performs.....its excellent right now
__________________
In The Days Before Rock 'n ' Roll
  Reply With Quote
Old 11th April 2003, 06:15 PM   #6
A 8 is offline A 8  Sweden
diyAudio Member
 
Join Date: Mar 2003
Location: Gothenburg
I am sorry for the somewhat negative sentiment...I am sure it sounds great.

I guess this forum is full of people trying to improve anything they can

Enjoy!!
  Reply With Quote
Old 22nd December 2003, 08:18 PM   #7
Coulomb is offline Coulomb  England
diyAudio Member
 
Coulomb's Avatar
 
Join Date: Jul 2002
Location: Ancaster, Ontario
I have just finished this DAC.

Not up and running yet, soon Hopefully.

See here for pics.

http://24.70.80.252/gallery/view_alb...album04&page=1

Regards

Anthony
  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
Anyone have info about Jukka Tolonen? Maurizio Tubes / Valves 4 2nd November 2004 11:23 PM
JT-RIAA amp Jukka Tolonen peranders Analogue Source 6 19th August 2003 07:03 PM


New To Site? Need Help?

All times are GMT. The time now is 03:11 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