A Tripath TA3020 based amp - 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 January 2003, 09:35 PM   #1
diyAudio Member
 
Join Date: Jan 2003
Location: USA
Default A Tripath TA3020 based amp

Hi,

Just like to share some info on the switching I recently built. Unlike most others, this one is based on Tripath's bridged TA3020 reference board. We had someone manufactured the PCBs and assembled them ourselves. Internal wires will be trimmed when everything is finalized.

The sound so far is above my original expectations so more parts upgrade and circuit revisions will come.

Here are some facts:

Chip: Tripath TA3020
PCB design: Tripath bridged TA3020-2
Arrangement: Dual mono PCB but shared PS (limited room)
Main toro: Plitron 1500VA (30 lbs)
Main filter caps: 2 10,000uF/75V Mallory per rail
Power FET: 8 STW34N20 (34A N-FET) per channel
Power: >500W/ch
Idle power: 25W to >140W depends on setting
Net weight: 43 lbs

Hope to hear from people who have built Tripath amps. Other comments welcome too.

Cheers.

Ehien
Attached Images
File Type: jpg st3020_20030122_1b.jpg (67.7 KB, 6727 views)
  Reply With Quote
Old 22nd January 2003, 10:09 PM   #2
DJG is offline DJG
diyAudio Member
 
Join Date: Aug 2002
Location: Slovenia
Hello!

I just want to congratulate you on this great looking amp. I especialy like the golden front plate. I have just ordered one for my Aleph 5. How much did it cost you(the front plate)?
How old is TA3020? I haven't heard for it yet. Majbe it's just me, but I would realy like to see the schematic. Can you help?

How much did the whole amp cost?

Regards,
DJG
__________________
Mosfet rules! In any prospect!
  Reply With Quote
Old 22nd January 2003, 10:26 PM   #3
audioPT is offline audioPT  Portugal
diyAudio Member
 
Join Date: Aug 2002
Location: Right here
Tripath Components

Anyone can tell me where I can buy Tripath components? I live in Portugal, and here I can't buy them.

I know that those chips sound good.
But, sounds really good?

Thanks

Pedro Martins
  Reply With Quote
Old 22nd January 2003, 10:33 PM   #4
diyAudio Member
 
Join Date: Jan 2002
Location: Sweden
As far as I know you can get them directly from Tripath.

Cadaudio (www.cadaudio.dk) in Denmark have some.

Carl
  Reply With Quote
Old 22nd January 2003, 11:30 PM   #5
diyAudio Member
 
Join Date: Jan 2003
Location: USA
To answer a few questions here:

1. Datasheets for TA3020 chip and the bridged (RB-TA3020) reference board can be found and downloaded at:
http://www.tripath.com/data.htm

2. The total cost was about $700. Just the 1500VA toro cost me $150 and the chassis about $110. I saved a lot by buildling the boards myself. Otherwise each bridged TA3020 board from Tripath is $450 and two are needed.

3. The nice looking chassis was purchased from:
http://www.thlaudio.com/indexE.htm
It's small for such an amp. But I got by with smaller Mallory caps (but high in quality) and boards attach to side panels/heatsinks.

4. I believe TA3020 chip is newer than TA0104 but may came out before TA0105. My friend and I have studied quite a bit and consulted with Tripath tech support before making the choice. It should sound no worse than TA0104/0105 and is easier to bridge and modify. Cheaper too ($12/ea). Now I see Bel Canto starts to use it in their 6-channel model. I'm betting to be eventually more popular and lives longer than current 0105.

5. The sound is very transparent and detailed. The main things I want to improve now is to regain the liquid mid and deeper soundstage I used to have with tubes. Otherwise I enjoy quite a bit with it. It does show superority of vinyls over CDs better than my C-J tube amp.

Cheers.

Ehien
  Reply With Quote
Old 22nd January 2003, 11:46 PM   #6
diyAudio Member
 
Join Date: Jan 2003
Location: USA
Actually, there is another thing I'm trying to improve- high freq noise/hiss from speakers. It's not bad as I can barely hear it from listening chair in quietest background and most CDs/LPs have louder background noise than it. But I'd like to hear it even lower so one day higher efficiency (now 91dB) speakers can be used.

Because the noise didn't reduce much with input directly shorted on PCBs, I'm speculating most of them from chip itself or the output switching (+/-92V differentially).

Any advises?

Ehien
  Reply With Quote
Old 23rd January 2003, 05:38 AM   #7
diyAudio Member
 
Join Date: Feb 2001
Location: Sacramento, CA
ehein, you may be already aware of this, but there is a thread over at Audio Asylum that discussed a hiss problem with DIY Tripath amps. You can follow the discussion here, it has to do wth grounding:

http://db.audioasylum.com/cgi/m.pl?f...ipath&session=
  Reply With Quote
Old 23rd January 2003, 06:17 AM   #8
diyAudio Member
 
Join Date: Feb 2001
Location: Sacramento, CA
ehien, sorry! The thread starts here:

http://db.audioasylum.com/cgi/m.pl?f...th&r=&session=
  Reply With Quote
Old 23rd January 2003, 06:48 AM   #9
diyAudio Member
 
Join Date: Jan 2003
Location: USA
Hi Cherhit,

Thanks for the link. No, I was not aware of that particular thread on AA.

But I understood the issue on AGND, DGND, and +5V supply and had implemented it properly. The bridged TA3020 board was designed to tie AGND and DGND on board (not on chip) with a ferrite bead.

But one of the things I was thinking was reducing noises on +5V and AGND. Hmmm... maybe I should also check if the ferrite beads are damaged.

Anyway, thanks for the lead.

Ehien
  Reply With Quote
Old 23rd January 2003, 08:00 AM   #10
diyAudio Member
 
Cradle22's Avatar
 
Join Date: Jan 2003
Location: Dortmund, Germany
Hi!

One thing you should be aware of, that Tripath based amps cause a lot (and I mean REALLY a lot) of electromagnetical interferences. The would never really pass any industrial EMV (that's what those interferences are called in Germany) standards, which is why for example high-end DIY manufactuer THEL has dropped the development of a Tripath digital amp.

Maybe check it one time with a TV-set or radio receiver next to the amp...

But anyway, since it's DIY, who cares...


Ciao,

Arndt
__________________
************************
A Sacrifice For Freedom
  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: Tripath RB-TA3020-2 Reference Board theAnonymous1 Swap Meet 4 12th June 2009 12:17 AM
WTB: tripath ta3020 chip or motorola dcp-501 iko Swap Meet 0 27th September 2008 03:03 AM
i have tripath ta2022 and ta3020 gerbers raptorhelis Class D 2 7th July 2006 08:05 AM
Tripath TA3020 Deltat Chip Amps 0 1st November 2004 04:24 AM
Tripath RB-TA3020-2 question jsalk Class D 6 19th July 2004 06:27 PM


New To Site? Need Help?

All times are GMT. The time now is 12:28 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