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TPA3255 - all about DIY, Discussion, Design etc.
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Old 4th December 2020, 07:42 PM   #3251
daniboun is online now daniboun  France
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Join Date: Nov 2019
Location: Lyon (France)
Quote:
I'm using Nichicon Muse BP for the input caps, it adds bloom to the sound and sparkling highs which is not compatible with OPA1656 sound. Haven't tried OPA1656 after that. I will try the OPA1656 again for Elna Silmic II caps.
Drmordor modules are using Elna Silmic II caps for buffer, I was really surprised to see how MC33272 + Elna Silmic II work well together.... far away better than OPA1602 and OPA1642 with Elna Slimic II caps for instance.

I guess rolling appropriate OP amps depends a lot on the Inductors as well + synergy with the input caps. You will find some measurements in 360 Customs site about this.

My last improvements on DrModor Module :

Click the image to open in full size.

Last edited by daniboun; 4th December 2020 at 08:01 PM.
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Old 4th December 2020, 08:27 PM   #3252
wealas is offline wealas
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Join Date: Apr 2017
Quote:
Originally Posted by chermann View Post
Hi experts


I played some time ago with the TPA3255chinese boards. i am a little bit confused with the select able gain what you wrote. i rechecked the datasheet and i found just that what i know ---> 21.5dB gain
How is it possible to set the gain of this amplifier?


chris
PFFB reduces overall gain and you can control how much by changing the feedback. TI app note here:https://www.ti.com/lit/pdf/slaa788
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Old 4th December 2020, 09:46 PM   #3253
daniboun is online now daniboun  France
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Join Date: Nov 2019
Location: Lyon (France)
Hi amigos,

Just to share ) TAS3251 with internal DSP, quick test at home (video) >

VID_20201012_191848


Click the image to open in full size.
taille image en ligne

Last edited by daniboun; 4th December 2020 at 09:50 PM.
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Old 4th December 2020, 10:10 PM   #3254
mamocel is offline mamocel  France
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Join Date: Nov 2018
Location: Vendée in power
this is a full audio digital amp (fda) whith the latest chip of TI ?

Last edited by mamocel; 4th December 2020 at 10:19 PM.
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Old 4th December 2020, 10:57 PM   #3255
mamocel is offline mamocel  France
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Join Date: Nov 2018
Location: Vendée in power
I2s usb conected !miam!
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Old 5th December 2020, 06:23 AM   #3256
daniboun is online now daniboun  France
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Join Date: Nov 2019
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Quote:
Originally Posted by mamocel View Post
this is a full audio digital amp (fda) whith the latest chip of TI ?
TAS3251 = TPA3251 + DSP in the same chip
I'm not a fan of I2S inputs, I'm still puzzled....
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Old 5th December 2020, 06:51 AM   #3257
sychan is offline sychan
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Join Date: Aug 2019
Location: SF Bay Area
Quote:
Originally Posted by daniboun View Post
Hi amigos,

Just to share ) TAS3251 with internal DSP, quick test at home (video)
Is this one of JMF11's NeatAmps? That is an interesting project, but it is hard for me to get a feel for the final outcome. It would be nice to have a great amp that plugs directly into my RPi without messing around with a DAC. The HiFiBerry Amp100 looks great in terms of plug and pla but the specs are underwhelming.
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Old 5th December 2020, 06:59 AM   #3258
daniboun is online now daniboun  France
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Join Date: Nov 2019
Location: Lyon (France)
Exact ) I met JMF11 a few weeks ago.

We have tested his TAS3251 vs TPA3251 with OPA1656 + updated inductors vs Dual Mono Infineon Merus
It was a super interesting listening session anyway )

The main interest of the TAS3251 is precisely to integrate a DSP) otherwise you might as well opt for a TPA3251....
As you can see, this TAS3251 does not have any OP amps, the signal is processed in the chip

My next challenge is : to propose to "la maison du haut parleur" (very famous shop in France), via an expert's opinion, a comparison between my future Purifi amp with a custom buffer VS the new Dual Mono Gan DrMordor VS the TPA3255 DrMordor.
I expect a lot from Drmodor Gan dual Mono modules.

Everything is already on the way... January should be an interesting month)

Last edited by daniboun; 5th December 2020 at 07:16 AM.
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Old 5th December 2020, 07:08 AM   #3259
sychan is offline sychan
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Join Date: Aug 2019
Location: SF Bay Area
JMF11 shared his opinion of the comparison, and it seemed that the NeatAmp was a good match for his tastes. How about for you? How did it sound compared to the other TPA3251 amps you have like the Aiyima or the 3e-Audio? Your Aiyima is heavily modified, any sense of how it sounds compared to a vanilla Aiyima?
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Old 5th December 2020, 07:35 AM   #3260
mamocel is offline mamocel  France
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Join Date: Nov 2018
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Quote:
Originally Posted by daniboun View Post
TAS3251 = TPA3251 + DSP in the same chip
I'm not a fan of I2S inputs, I'm still puzzled....
No analog input...on tas3251,what's the format input ?
I2s i think.

Last edited by mamocel; 5th December 2020 at 07:41 AM.
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