TA2020 - feeding clean regulated 5V for input stage - anybody tried that? - diyAudio
Go Back   Home > Forums > Amplifiers > Class D

Class D Switching Power Amplifiers and Power D/A conversion

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 22nd April 2010, 01:45 PM   #1
diyAudio Member
 
soundcheck's Avatar
 
Join Date: Mar 2005
Location: D
Default TA2020 - feeding clean regulated 5V for input stage - anybody tried that?

Hi folks.


Anybody tried to feed he 2020 or 2021B with external clean, regulated
5v on V5D, V5A instead of feeding the internally generated 5V?

The 5V will supply the input stage. Perhaps something can be gained with
a low noise regulator hooked up at these legs!?!?

Perhaps it is even worth to think about separating V5D and V5A.

Any opinions/experiences?


Cheers
  Reply With Quote
Old 22nd April 2010, 03:19 PM   #2
Pano is offline Pano  United States
diyAudio Moderator
 
Pano's Avatar
 
Join Date: Oct 2004
Location: Milliways
Blog Entries: 4
I think BWRX did this a few years back. It worked OK but was not killer. He sent me one to test and listen to. It was a 2024 chip, IIRC.

A search should turn it up.
__________________
Take the Speaker Voltage Test!
  Reply With Quote
Old 22nd April 2010, 05:53 PM   #3
diyAudio Member
 
soundcheck's Avatar
 
Join Date: Mar 2005
Location: D
THX a lot.

I was wondering, because on e.g. Hypex modules the new reg generation did improve the quality.

Perhaps I should just give it a try.

Cheers
  Reply With Quote
Old 22nd April 2010, 07:37 PM   #4
Pano is offline Pano  United States
diyAudio Moderator
 
Pano's Avatar
 
Join Date: Oct 2004
Location: Milliways
Blog Entries: 4
Yeah, go for it! It should not be hard to do.
  Reply With Quote
Old 22nd April 2010, 07:49 PM   #5
diyAudio Member
 
theAnonymous1's Avatar
 
Join Date: Feb 2004
Location: Anonymityville
My Ref-T amp

Quote:
Originally Posted by BWRX View Post
The major difference between this board and others is in the implementation of the power supply. There are 4 separate external regulators for the various supply inputs on the chip. One TO220 size regulator for the output stages of each channel, one TO220 size regulator for the analog driving stage, and one SOT223 size regulator for the 5V input section. Interestingly enough, Tripath was kind enough to let me know that certain supply pins are "weakly" connected internally, so large voltage differentials between the supply pins could result in current flowing through the weak connections and having them blow like a fuse. This could damage the chip but I'm going to build one up anyway and see what happens! My gut feeling tells me that nothing will happen if I use quality regulators and the output voltages are set very close to one another.
.
  Reply With Quote
Old 24th April 2010, 01:01 AM   #6
cicotte is offline cicotte  Canada
diyAudio Member
 
Join Date: Nov 2008
Yes i have tried this and is very well worth it, without getting into detail the sound is simply better in every way, particularly the bass and sound stage depth. All i did was arranged a regulator board close to the ta2020 amp using 317t reg,2700uf pany .01uf film pre reg filt, 330uf nichicon kz output, 100 ohm,300ohm for resistors. I just cut trace to pin 30 5v gen, and feed external reg to pin 2 or 8 there connected at the board use ether one and pin 3,7 for gnd.
Attached Images
File Type: jpg P1010053 (1136 x 852).jpg (315.9 KB, 166 views)
  Reply With Quote
Old 5th May 2010, 10:58 AM   #7
audi0 is offline audi0  Australia
Account disabled at member's request
 
Join Date: May 2009
Location: 37.34 degrees South
Blog Entries: 5
I just completed the 5v regulated supply modification, as Cicotte mentioned, it doesn't make a dramatic change to the amp, more subtle.
The board is a modded Helder MkIII, I fed the -Ve to pin 3, I cut the leg off of pin 30 and soldered the 5 volt supply directly to the leftover bit of leg.
The components for the regulator board I had laying around, the Muse cap's are probably a bit of an overkill! if nothing else it was an interesting soldering exersise
Attached Images
File Type: jpg IMGP1982.JPG (78.0 KB, 111 views)
  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
regulated 5V DC supply Tomatito Tubes / Valves 51 29th October 2012 07:00 PM
Regulated Linear 5V ~1A supply percy Parts 4 22nd April 2009 09:00 AM
Getting + 5V after regulated +/- 15V psu - Use LM7805 or LM317? Groundloops Power Supplies 2 24th September 2008 08:11 PM
5V out of 12V regulated DECKY999 Power Supplies 0 7th April 2008 05:37 AM
7805 regulated 5V supply Joel Tubes / Valves 3 20th January 2003 10:52 PM


New To Site? Need Help?

All times are GMT. The time now is 06:16 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