THE TRUE BALANCED SOURCE - 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 26th February 2012, 06:25 PM   #1
Stee is offline Stee  Italy
diyAudio Member
 
Stee's Avatar
 
Join Date: Jul 2005
Location: milan
Default THE TRUE BALANCED SOURCE

To get a clean sound you must have a source DAC with XLR balanced outputs
But we must know that the drives are not complementary P and N

they are composed of the same identical semiconductors
but driven by a PCM digital number in opposite phase.

So to cancel the print tone of the Digital to Analog converter
must operate a subtraction
NOT A SUM

this is possible by using a potentiometer for the adjustment of the listening volume in series with a resistor of equal value

suggest 1K
Attached Images
File Type: gif XLR-RCAWiringDiagram.GIF (57.9 KB, 269 views)
__________________
Please download my best audio idea https://www.facebook.com/DiyAudioHiEnd
  Reply With Quote
Old 27th February 2012, 10:49 AM   #2
diyAudio Member
 
Speedskater's Avatar
 
Join Date: Sep 2002
Location: Lakewood, Ohio
Pin #1 of a XLR balanced analog circuit is not ground, it is not part of the audio circuit. XLR pin # 1 is the shield and should only be connected to the chassis near the connector.
__________________
Kevin
  Reply With Quote
Old 27th February 2012, 11:33 AM   #3
Stee is offline Stee  Italy
diyAudio Member
 
Stee's Avatar
 
Join Date: Jul 2005
Location: milan
Default NATURAL MODULATION

that PCM CONVERTER is born with wrong way
IS NOT MADE FOR AUDIO
we must know that the drives are not complementary P and N
as Law of twice denied would.



this means that the method of complementary
must be applied in a manner opposite
To qualify for compensatory timbre of the two systems
Attached Images
File Type: gif modulazioni.gif (17.9 KB, 238 views)
__________________
Please download my best audio idea https://www.facebook.com/DiyAudioHiEnd
  Reply With Quote
Old 27th February 2012, 11:39 AM   #4
diyAudio Member
 
Join Date: Jan 2008
Location: Virginia
You are wrong. DAC cips are build in CMOS technology - complementary-symmetry metal–oxide–semiconductor.

And anyway, that theory canceling with P and N applies only for amplifiers final stage working in AB class. Nothing to do with DAC output that is a class D type (because of the Pulse-Modulating signal that reperesents). The digital signal is... digital, there is no "ballanced" PCM or DSD.

Read a book, something...

Last edited by SoNic_real_one; 27th February 2012 at 11:44 AM.
  Reply With Quote
Old 28th February 2012, 12:35 PM   #5
Stee is offline Stee  Italy
diyAudio Member
 
Stee's Avatar
 
Join Date: Jul 2005
Location: milan
TEAC UD-H01 convertitore D/A con USB
The current of the PCM1796 on each of the output pins (IOUTL+, IOUTL–, IOUTR+, IOUTR–) is 4 mA p-p at 0 dB (full
Scale). Differential Current Output: 4 mA DON'T MEANS COMPLEMENTARY OUTPUT
http://www.ti.com/lit/ds/sles100a/sles100a.pdf
__________________
Please download my best audio idea https://www.facebook.com/DiyAudioHiEnd
  Reply With Quote
Old 28th February 2012, 01:02 PM   #6
qusp is offline qusp  Australia
diyAudio Member
 
qusp's Avatar
 
Join Date: Oct 2009
Location: Brisbane, Australia
hmm yes that old pin 1 chestnut, dont tell me you missed it?
  Reply With Quote
Old 28th February 2012, 08:30 PM   #7
Stee is offline Stee  Italy
diyAudio Member
 
Stee's Avatar
 
Join Date: Jul 2005
Location: milan
To find out if I'm right or wrong, just do a simple test -

a double potentiometer connected to the balanced outputs, stay around the middle of the range, the more you are close to zero is the most effective cancellation -

then turn up the gain of the amplifier with inputs unbalanced RCA

try to hear what happens to the sound:
a magical horizon suspended in midair generates sounds
Attached Images
File Type: png testing DAC.PNG (15.7 KB, 170 views)
__________________
Please download my best audio idea https://www.facebook.com/DiyAudioHiEnd
  Reply With Quote
Old 29th February 2012, 03:44 AM   #8
qusp is offline qusp  Australia
diyAudio Member
 
qusp's Avatar
 
Join Date: Oct 2009
Location: Brisbane, Australia
no need for experiments, its pretty basic electronics that pin 1 is for shield/chassis not signal ground. if you need to connect an RCA output/input to a balanced input/output, use an instrumentation amp or transformer, which ever is suitable, dont try and make a magic cable do it

Last edited by qusp; 29th February 2012 at 03:49 AM.
  Reply With Quote
Old 29th February 2012, 11:08 AM   #9
Stee is offline Stee  Italy
diyAudio Member
 
Stee's Avatar
 
Join Date: Jul 2005
Location: milan
http://www.esafono.it/horizonevents.pdf
__________________
Please download my best audio idea https://www.facebook.com/DiyAudioHiEnd
  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
Balanced vs non-balanced crossover to power amp (Krell KSA100MKII clone) question stolbovoy Solid State 0 24th December 2010 03:54 PM
Balanced XLR source RIAA Stee Analog Line Level 25 11th October 2008 11:59 AM
balanced source to unbalanced amp? bays_9a5tt Pass Labs 33 9th September 2007 04:21 PM
True Balanced diy guy Solid State 0 18th November 2004 09:46 AM
Can a portable CD player be considered as a balanced source? Bricolo Solid State 10 24th December 2002 05:11 PM


New To Site? Need Help?

All times are GMT. The time now is 09:17 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