A NOS 192/24 DAC with the PCM1794 (and WaveIO USB input) - Page 19 - diyAudio
Go Back   Home > Forums > Source & Line > Digital Line Level

Digital Line Level DACs, Digital Crossovers, Equalizers, 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 1st March 2013, 04:22 PM   #181
AudioH is offline AudioH  United Kingdom
diyAudio Member
 
Join Date: Aug 2011
Location: Swindon
Quote:
Originally Posted by Bas Horneman View Post
It actually is balanced already.
Thank you Bas

I thought so, but how do I connect the XLR connectors ? Directly to the output pins ? If so is a DC decoupling capacitor required for both -ve and +ve legs ?

Regards
  Reply With Quote
Old 2nd March 2013, 06:56 AM   #182
diyAudio Member
 
Join Date: Sep 2003
Location: West of Netherlands
Hi,

as far as I heard, or read on Audio Creative site, for balanced output you don't need output capacitors.
Dick (one of the owners of Audio Creative) tested a TVC "preamp" with balanced input and he directly plugged the dac into it.....and he was very, very enthousiastic about that. Stil have to try that too with a different preamp myself.
  Reply With Quote
Old 2nd March 2013, 07:42 AM   #183
dhbiker is offline dhbiker  Slovenia
diyAudio Member
 
Join Date: Feb 2012
Location: Maribor/Ormož, Slovenia
damn you guys with your pictures... i'm considering about getting DDAC myself too but you know how the students pockets are

*hopefully* i'll order it in summer
  Reply With Quote
Old 6th March 2013, 07:58 AM   #184
dddac is offline dddac  Germany
diyAudio Member
 
Join Date: Jul 2003
Location: Wiesbaden
Quote:
Originally Posted by AudioH View Post
Thank you Bas

I thought so, but how do I connect the XLR connectors ? Directly to the output pins ? If so is a DC decoupling capacitor required for both -ve and +ve legs ?

Regards
hope I am not too late

the DC voltage between the POS and NEG output is indeed very low, just a few mV or sometimes even below it. If you use only these two to connect to a balanced system, than things are fine, as for DC blocking.

but, you should not connect the common terminal in that case, as than you will see two times 2,7 Volt DC. in this case you need the output capacitors.

I know from one DDDDAC builder who is using a tube amplifier stage directly after the DAC and actually uses the DC voltage in the bias from the first tube, avoiding coupling capacitors....

there are several possibilities and situations. Every one should check his specific situation and make the appropriate circuit connections.

in doubt, just email me .....
__________________
www.dddac.com
Happy listening and building
  Reply With Quote
Old 6th March 2013, 08:04 AM   #185
dddac is offline dddac  Germany
diyAudio Member
 
Join Date: Jul 2003
Location: Wiesbaden
Quote:
Originally Posted by zjaakco View Post
Hi Doede,
I have read your explenation on your site, and make mine decision to make one.
Words are words, but still there is something , I think your design is right.
Mine knowwlegde is not sufficient to design the delay in the I2S line.
So, I have order a waveIO board, and collecting / buy parts.
Still a few questions, I can't determine what is the L or R channel, i have read the
blue line in the delay circuit. and,
you use a output trafo, are you still use the A B iv resistors on that position, or
a ristor on the sec side?
I have good experiens with an outputtrafo.
Regards,
Zjaakco
Thanks for positive feedback

on the left right question. if you check my circuit diagram, you see on page 2 at the right the connections to the dac. they are indicated as right and left channel. the left channel is the one with the most delay ... hope this helps?

the resistors are needed to do the DC biasing of the DAC output, so they have to stay. I also use a secondary load of 10k.this has been very arbitrary and can be left out or lowered or whatever. it is only to dampen the transformer a bit for the small peak round 200kHz. I could not hear a difference, but could measure it, so I left the 10k in to go kind of sure ...
__________________
www.dddac.com
Happy listening and building
  Reply With Quote
Old 6th March 2013, 09:19 AM   #186
diyAudio Member
 
Join Date: Jul 2011
Hi Doede.
Thank you for your explenation.
Regards
Zjaakco
  Reply With Quote
Old 6th March 2013, 10:44 AM   #187
Almeg69 is offline Almeg69  United Kingdom
diyAudio Member
 
Join Date: Mar 2009
I have placed my order for the kit of parts and will look forwards to putting it together.

No doubt I will be back here later for advice ....
__________________
Alex H
  Reply With Quote
Old 6th March 2013, 11:55 AM   #188
AudioH is offline AudioH  United Kingdom
diyAudio Member
 
Join Date: Aug 2011
Location: Swindon
Default DAC Kit Arrives

DAC Kit arrived yeesterday. Quality of boards is truely excellent ! Will start assembling this evening.
Many thanks for repsonse to balanced output query.
Regards
  Reply With Quote
Old 7th March 2013, 02:34 PM   #189
dddac is offline dddac  Germany
diyAudio Member
 
Join Date: Jul 2003
Location: Wiesbaden
Quote:
Originally Posted by AudioH View Post
DAC Kit arrived yeesterday. Quality of boards is truely excellent ! Will start assembling this evening.
Many thanks for repsonse to balanced output query.
Regards
great, let me know what you think !
and....
keep posting pictures
__________________
www.dddac.com
Happy listening and building
  Reply With Quote
Old 7th March 2013, 04:52 PM   #190
IanS1 is offline IanS1  United Kingdom
diyAudio Member
 
Join Date: Jan 2012
Location: UK
Quote:
Originally Posted by dddac View Post
great, let me know what you think !
and....
keep posting pictures
Yes, we need more pictures, preferably with cases. Still haven't decided how I'm going to case mine so need some ideas.
  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
FS: Audio Widget (modified) Async USB DAC 24/192 ESS 9023 headphone friendly ASIO KS 2A3SET Swap Meet 5 15th August 2012 04:52 AM
Show my PCM1794 DAC TSOLINK + COAX + USB input, Line and headphone AMP output AWaudio Vendor's Bazaar 3 2nd January 2012 12:44 PM
GodDAC - 192/24 USB DAC BizonGod Digital Source 36 30th June 2011 03:16 PM
24 bit/192 kHz via USB? gentlevoice Everything Else 3 22nd December 2008 06:24 AM


New To Site? Need Help?

All times are GMT. The time now is 11:46 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