IREF, the secret of the TDA1545A - diyAudio
Go Back   Home > Forums > Commercial Sector > Manufacturers > Inactive Manufacturer Forums > Junilabs

Junilabs High quality DAC kits and hand crafted products from Junilabs

 
 
Thread Tools Search this Thread
Old 11th July 2011, 10:14 AM   #1
diyAudio Member
 
Eric Juaneda's Avatar
 
Join Date: Dec 2006
Location: Avignon, France
Default IREF, the secret of the TDA1545A

I never find that datasheet for TDA1545A is very clear. There are a lot of interrogations about the interesting IREF pin. You can find on this forum many threads speaking about.

For the Jundac Five, I test various configurations for IREF, starting with the standard one recommended by Philips. Each configuration for IREF changes sound rendering. This pin is very sensitive and affect: tonal balance, subjective definition, stability of music, precision, bass depth...

The standard configuration recommended by Philips gives a very rounded sound without much details; very pleasant but not very realist! The solution that I develop for the Jundac Five pushes the audio quality far away.

For the final kit, I develop a reference tension in discrete technology. The IREF pin is driven by low impedance reference tension (VREF). For VREF, the quality of each component is crucial. Low noise transistors and high quality capacitors like polypropylene film are used to drive this crucial pin. Using electrolytic capacitor degrade sound rendering by masking details and reducing subjective definition.

Click the image to open in full size.

With this original driving, the TDA1545A reaches unknown dimensions with very large and strong bass, good definition and fine treble. It changes from all other realizations.
__________________
Eric Juaneda - tech.Juaneda.com - Junilabs.com
 
Old 11th July 2011, 06:02 PM   #2
diyAudio Member
 
Eric Juaneda's Avatar
 
Join Date: Dec 2006
Location: Avignon, France
A picture of VREF

Click the image to open in full size.
__________________
Eric Juaneda - tech.Juaneda.com - Junilabs.com
 

 


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
pcm1794 Iref and cap questions Aiace Digital Line Level 9 19th February 2010 08:30 AM
TDA1545 Vref and Iref questions hollowman Digital Line Level 0 14th January 2008 07:11 AM
PCM179x Vref/Iref and Iout relationship roender Digital Source 9 8th December 2006 01:08 PM
What's the secret? lumanauw Pass Labs 23 31st March 2005 04:11 AM
Iref dac tda1545 alchemy Digital Line Level 1 21st December 2003 10:58 AM


New To Site? Need Help?

All times are GMT. The time now is 07:37 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