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My Dual Mono TI TPA3255EVM based Class D Amplifier build

Audiolab 6000CDT Dedicated CD Transport

vizeta

Active Member
Joined
Apr 3, 2011
Messages
208
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Location
Bangalore, India
Hey Guys,

As Promised, here are details of my TI TPA3255EVM AMP build.


Stage 1:
After reading very encouraging reviews about TPA3255 chip, I decided to try it and ordered a Chinese (black version) from Aliexpress. While this board was in transit I came across the very positive reviews of TI TPA3255EVM module and discount (50%) offer on class D Amp module. I went ahead ordered one module.

The Board was not in stock when I ordered but they shipped it after 20 days they shipped it via Fedex. It was a very painful experience to get it Custom cleared via Fedex. And it took almost 20 days to get it cleared.
But it got delivered around the same time when the Chinese board was delivered via India post :)

I sold the Chinese board to a very friendly FM here.

I connected the EVM board to my setup and was blown away by the sweet and highly detailed output of the speakers. I used Lagaan, Daft Punk- Random Access Memories and Hotel California Flac files to check the performance.
Test Setup : RPI3+Allo Boss DC >>> Allo stepped attenuator >>> TPA3255EVM BTL mode + Mean Well LS-350-48 >>> Heco Victa 700

Stage 2:

I was so much excited by the performance of the board and diyaudio forum reviews encouraged me to try the board in PBTL config (dual mono).

I ordered one more EVM board and another SMPS to power it.

Then I started hunting for a decent cabinet for the Amp (but was not ready to pay the premium price). I found this PRO POWER G17082UBK 19" Case, ABS, 2U cabinet.

I paid around Rs 3400/- for the same. The ABS material is very easy to work with. it was very easy to make holes and mounting the board.

I am yet to test it fully, but I felt for some reason (maybe psychological) the performance is not that great (compared to the single EVM board in BTL mode).
Will update the thread later with a detailed review of the sound quality.

Here is my build picture:
The Amplifier:
WhatsApp Image 2018-02-26 at 9.48.43 PM (5).jpegWhatsApp Image 2018-02-26 at 9.48.42 PM.jpegWhatsApp Image 2018-02-26 at 9.48.42 PM (2).jpeg



The Power Supply:

I decided to go ahead with dual Mono configuration and to maintain (at least I tried to) I ordered two Mean Well LRS-350-48 (48 Volts 350 Watts) SMPS modules.
Since the Cabinet was not big enough to accommodate 2 x TPA3255EVM boards along with 2 x SMPS modules, I placed SMPS modules inside a Metalic Tea box :) (Will upgrade it later).

WhatsApp Image 2018-02-26 at 9.48.43 PM (3).jpeg


Power Supply Connections:

Now, The next problem was how to connect the SMPS outputs to AMP via a connector (should be able to handle 7+ Amps). The obvious choice was to use Banana connectors. But I don't to take a chance where someone may connect the PSU plugs to Speaker binding posts.

I came across this >> JELEN HP20, 4 pin power connector (IP55). The specs suggest the connector can hanlde upto 30Amp.
I ordered this from aliexpress and used it to connect the PSUs to Amp.

WhatsApp Image 2018-02-26 at 9.48.43 PM (1).jpegWhatsApp Image 2018-02-26 at 9.48.43 PM (2).jpegWhatsApp Image 2018-02-26 at 9.48.42 PM (3).jpeg
 
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Rud31

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Oct 4, 2018
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How is the startup of the amps? The Chinese TPA3255 boards don't have speaker protection circuitry thus giving a loud pop on powering up. What about this one?
 

SanjeevM

Active Member
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Mar 28, 2017
Messages
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Location
Jabalpur
There is a small pop at shutdown. Not speaker busting.

I am using this board since a long time. It's a wonderful amplifier.
 

vizeta

Active Member
Joined
Apr 3, 2011
Messages
208
Points
28
Location
Bangalore, India
How is the startup of the amps? The Chinese TPA3255 boards don't have speaker protection circuitry thus giving a loud pop on powering up. What about this one?
As mentioned by @SanjeevM it makes a small pop at shutdown. But its not too loud to make you think about having a speaker protection broard added with it.
 
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