Go Back   Home > Forums > >
Home Forums Rules Articles diyAudio Store Blogs Gallery Wiki Register Donations FAQ Calendar Search Today's Posts Mark Forums Read

Class D Switching Power Amplifiers and Power D/A conversion

TI TPA3255EVM
TI TPA3255EVM
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 18th February 2018, 12:40 PM   #551
watchtmouse is online now watchtmouse  Germany
diyAudio Member
 
watchtmouse's Avatar
 
Join Date: Feb 2013
Location: NRW
Default new TPA3255EVM user

Hi All,

Ordered the TPA3255EVM board together with a Mean Well USP-350-48 (350W Single Output with PFC Function, no fan).

This Mean Well USP-350-48 has no screw down terminals, ( I did not notice ) so I need to order:

2 x Buchsenleiste (Standard) VH Polzahl Gesamt 7 JST VHR-7N Rastermass: 3.96 mm 1 St. kaufen

1 x Buchsenleiste (Standard) VH Polzahl Gesamt 5 JST VHR-5N Rastermass: 3.96 mm 1 St. kaufen

3 x Buchsenkontakt VH Polzahl Gesamt 1 JST BVH-41T-P1.1 1 St. kaufen

Put together today and was surprised that I had no sound from the right channel, no wonder because Page 3 of the User documentation for the TPA3255EVM states:
"The input RCA jack, J3, is used to provide INA inputs and RCA jack J14 is used to provide INB inputs. RCA jack J18 is used to provide INC inputs and RCA jack J15 is used to provide IND inputs with differential inputs.".

Luckily the 2.1 schema on page 5 shows the right configuration, to get the right channel working from my iPhone so I used J3 and J18 for single ended inputs.

Mentioned before, but repeating here boards dimensions are 160 x 120 mm and not 140 x 120 mm as stated on page 12.
The actual height of the evaluation kit is 78 mm, (Measured bottom of the standoffs on the table up to the top of the heatsink).

For the first listening form the pod I have no complaints.

See picture of the setup.

Happy listening
Grtz

Bert
Attached Images
File Type: jpg IMG_20180218_124338170.jpg (762.2 KB, 284 views)
  Reply With Quote
Old 18th February 2018, 04:50 PM   #552
watchtmouse is online now watchtmouse  Germany
diyAudio Member
 
watchtmouse's Avatar
 
Join Date: Feb 2013
Location: NRW
Default Too much and a good match

One more time today,

This amp "TPA3255EVM" is too much for my old test speaker the small JBL Northridge E 20.

But a perfect match for my KEF LS50 speakers, with the "I pod" playing I can not tell about the full spectrum, but the "I pod", TPA3255EVM and the LS50 are a very nice trio for long listening sessions.

Hopefully, next week I will connect the DDDAC-1794, and check that combo.

Until then happy listening too all.

Grtz

Bert
  Reply With Quote
Old 18th February 2018, 04:53 PM   #553
rhing is offline rhing  United States
diyAudio Member
 
rhing's Avatar
 
Join Date: Jun 2007
Location: Minneapolis, MN
I use the TI TPA3255EVM with a pair KEF LS50 speakers as well, and they are a great match. Give the amp some time to really burn in and connect a better source—you will really be pleased with the results.
__________________
Rich
  Reply With Quote
Old 22nd February 2018, 08:27 AM   #554
a3cervo is offline a3cervo  Philippines
diyAudio Member
 
Join Date: Oct 2012
Hi watchmouse,

Do you experience turn-on or turn-off thump/pop with your TPA3255EVM+MW USP-350-48?

Thanks,
Anton
  Reply With Quote
Old 22nd February 2018, 11:28 AM   #555
watchtmouse is online now watchtmouse  Germany
diyAudio Member
 
watchtmouse's Avatar
 
Join Date: Feb 2013
Location: NRW
Yes, I do have turn-on/off thumbs.

I use the reset button on the EVM to "prevent" the turn-on turn-of thumbs

I set the button to reset mode before power-on, when I hear the click on the mean well PSU and the green led on the EVM board are on, I set the reset switch to the normal position. On power-off I do the reverse.

Grtz
Bert
  Reply With Quote
Old 22nd February 2018, 11:41 AM   #556
SanjeevM is offline SanjeevM
diyAudio Member
 
Join Date: Jun 2017
If you dont use the reset button, are the thumps very loud, like speaker busting loud, or just loud clicks?
__________________
RPi 3/ Boss DAC 1.2/ TPA3251/ IFI Power 5V & Allo Adapter/ Paradigm Monitor 11 / Non-Electronics background
  Reply With Quote
Old 22nd February 2018, 11:42 AM   #557
SanjeevM is offline SanjeevM
diyAudio Member
 
Join Date: Jun 2017
I have a 3eaudio tpa3251 board, where its just a mild click.
__________________
RPi 3/ Boss DAC 1.2/ TPA3251/ IFI Power 5V & Allo Adapter/ Paradigm Monitor 11 / Non-Electronics background
  Reply With Quote
Old 22nd February 2018, 11:59 AM   #558
watchtmouse is online now watchtmouse  Germany
diyAudio Member
 
watchtmouse's Avatar
 
Join Date: Feb 2013
Location: NRW
Default Just thumbs, not speaker "killing"

The thumbs are very audible, but not speaker "killing"

Grtz
Bert
  Reply With Quote
Old 22nd February 2018, 12:12 PM   #559
DizRotus is offline DizRotus  United States
diyAudio Member
 
Join Date: Feb 2005
Location: Birmingham, MI
With my efficient DIY horn-loaded speakers the turn on “thump” is more of a click.

I struggled with what to do about the reset button after putting the EVM and Meanwell in a case. Rather than relocating the reset to the exterior, I leave it at “normal” and control line voltage to the Meanwell from the on/off switch on the case.

I use one of two Pono players in lieu of a pre-amp. I always turn on the Pono player first before powering the Meanwell, and the reverse at shut down. The noise heard from the speakers is negligible.

FWIW, at idle between tracks on songs, there is NO hum from the very efficient speakers. With any tube amp I ever used, there was always a slight hum under those conditions.
__________________
Neil
  Reply With Quote
Old 22nd February 2018, 12:48 PM   #560
a3cervo is offline a3cervo  Philippines
diyAudio Member
 
Join Date: Oct 2012
Thanks Bert, planning to put this in a DIY case and I want to know if I need to make a hole in the enclosure panel where the reset button is so I can toggle the switch during turn on.

Quote:
Originally Posted by watchtmouse View Post
Yes, I do have turn-on/off thumbs.

I use the reset button on the EVM to "prevent" the turn-on turn-of thumbs

I set the button to reset mode before power-on, when I hear the click on the mean well PSU and the green led on the EVM board are on, I set the reset switch to the normal position. On power-off I do the reverse.

Grtz
Bert

Hi DizRotus, how did you control the line voltage to the Meanwell psu. Sorry I'm very green on this topic and honestly this is gonna be my first amplifier project

If you can post a picture of the internal of your amp, I would really appreciate it.

Thanks and regards,
Anton


Quote:
Originally Posted by DizRotus View Post
With my efficient DIY horn-loaded speakers the turn on “thump” is more of a click.

I struggled with what to do about the reset button after putting the EVM and Meanwell in a case. Rather than relocating the reset to the exterior, I leave it at “normal” and control line voltage to the Meanwell from the on/off switch on the case.

I use one of two Pono players in lieu of a pre-amp. I always turn on the Pono player first before powering the Meanwell, and the reverse at shut down. The noise heard from the speakers is negligible.

FWIW, at idle between tracks on songs, there is NO hum from the very efficient speakers. With any tube amp I ever used, there was always a slight hum under those conditions.
  Reply With Quote

Reply


TI TPA3255EVMHide 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

Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
TPA3255EVM to complete amp (advise needed) VerticalEaz Class D 69 14th August 2018 12:15 AM
tpa3255evm spacesaver mod robinlawrie Class D 84 12th December 2017 07:20 AM


New To Site? Need Help?

All times are GMT. The time now is 07:23 PM.


Search Engine Optimisation provided by DragonByte SEO (Pro) - vBulletin Mods & Addons Copyright © 2018 DragonByte Technologies Ltd.
Resources saved on this page: MySQL 14.29%
vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2018 DragonByte Technologies Ltd.
Copyright ©1999-2018 diyAudio
Wiki