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building a TPA3255 260-2-29A, and need some guidance

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nick650

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Design goal: 200 rms per channel by four channels (want to be equal or better than my class AB amp), within the quality realm of a Buckeye amplifier, while being lower cost. I plan to have a four channel amplifier.

Location: USA

amplifier: 3e-audio-tpa3255 (have to wait roughly a month to get it from France) times two

Speakers: custom built 4ohm load times four

Power unit: https://micro-audio.com/store/product/smps1ks-pfcr2/

Would I be better off using a 48 volt vs a 50 volt main rail despite the max being 51?

Does this look like the right power supply for the job? What case might fit this (smaller the better)?

PS: First time amp builder

Thanks!
 
Last edited:
nick650 said:
Design goal: 200 rms per channel by four channels (want to be equal or better than my class AB amp), within the quality realm of a Buckeye amplifier, while being lower cost. I plan to have a four channel amplifier.

amplifier: 3e-audio-tpa3255 (have to wait roughly a month to get it from France) times two

Speakers: custom built 4ohm load

Power unit: https://micro-audio.com/store/product/smps1ks-pfcr2/

Would I be better off using a 48 volt vs a 50 volt main rail despite the max being 51?

Does this look like the right power supply for the job? What case might fit this (smaller the better)?

PS: First time amp builder

Thanks!
Click to expand...
Check out this thread by @danibaun
www.audiosciencereview.com

"Bamboo Project" : Dual Mono 3E Audio 480-1-29A Amplifier

Hi amigos, Following the ASR review of the 3E Audio 480-1-29A Module, I decided to roll up my sleeves and show you that with a little elbow grease, you can create a very beautiful amplifier based on these nice 3E Audio modules. I called this project, "Bamboo"> the pictures will speak for...
www.audiosciencereview.com www.audiosciencereview.com

He has a fair bit of experience building amps with these modules. I'm sure he'll be happy to help there.
 
For the Micro Audio SMPS I took the SMPS630-SO at 51V, its unregulated and can drop. As mentioned above there is information in the other posts

The SMPS630-SO with +51V will work perfectly, even its unregulated it may drop to 47VDC under 400W load.

Its also dependent on your mains voltage as I understand:
Please see below output voltage at AC input and make up your mind based on it. I'm in Switzerland and its 230 V so I'm actually getting 48.5 V (I think).
AC InputDC Output
24050.44
23549.3
23048.5

You can email Micro Audio, Sami is super helpful.

I used the Modushop cases and got them to drill the holes (and tap the holes) not the cheapest but maybe the easiest.. (they are a bit tricky to earth as they are anodized). Danibaun is the master of making these amps, take a look at his posts...

I shared a list of the parts I ordered with someone else, if that's interesting or useful I can share it.

Good luck!
 
brunes said:
For the Micro Audio SMPS I took the SMPS630-SO at 51V, its unregulated and can drop. As mentioned above there is information in the other posts

The SMPS630-SO with +51V will work perfectly, even its unregulated it may drop to 47VDC under 400W load.

Its also dependent on your mains voltage as I understand:
Please see below output voltage at AC input and make up your mind based on it. I'm in Switzerland and its 230 V so I'm actually getting 48.5 V (I think).
AC InputDC Output
24050.44
23549.3
23048.5

You can email Micro Audio, Sami is super helpful.

I used the Modushop cases and got them to drill the holes (and tap the holes) not the cheapest but maybe the easiest.. (they are a bit tricky to earth as they are anodized). Danibaun is the master of making these amps, take a look at his posts...

I shared a list of the parts I ordered with someone else, if that's interesting or useful I can share it.

Good luck!
Click to expand...
I'm in the USA, and ya, those cases are almost the price of the project! Thank you for the insight.
 
brunes said:
diy audio store has some cases in the US... still need to make some holes though
https://diyaudiostore.com/collections/chassis
Click to expand...
They're a Modushop reseller, IIRC more cost effective than buying direct if you're in the US. Last I looked they also offered machining and printing if you don't have the capability yourself. I don't know whether that part is done by Modushop or locally.
 
nick650 said:

Leaning towards this power supply. Seems just about the max output for my requirements, and is much cheaper to boot.
Click to expand...
Note the need for additional heatsinking or a fan for rated output. Having said that, music often provides significant derating as average output is a fraction of transient output. This comes back to the old argument about FCC power ratings vs. real world use, and manufacturers that include fans that only ever come on during FCC style tests.
 
Hi,

As you know I shared my 3E Audio and Sylph Audio projects on ASR. The links are in my signature.
For the case, if you go with a Micro-Audio PSU, I recommend this one, It fits perfectly with the 3E Audio + Micro Audio combo

www.audiophonics.fr

Boîtier DIY DAC / Phono 100% Aluminium 308x215x70mm - Audiophonics

boitier-diy-100-aluminium-308x215x70mm
www.audiophonics.fr www.audiophonics.fr

The problem being that my projects have toured Europe and Audiophonics has sold almost all its stocks... Patience will be required)
I don't know if you plan to drill the back alu. panel yourself? But if this is the case, equip yourself with a 22mm drill bit if YES, get this one :

Drill tool

Regarding the PSU, since I tested almost all the PSUs on all of my TPA325X projects (Morsun / Meanwell, Micro-Audio, Audiophonics PFC, Connex, Custom LLC and others). 95% of these PSUs are regulated, only the Hypex and Micro-Audio PSUs are unregulated.
Without supporting measurements unfortunately... I continue to affirm that the Micro-Audio PSU brings something to the listening experience that I cannot feel with the other PSUs.

On the other hand, here is the FFT of the Micro-Audio PSU VS Hypex, which are unregulated and therefore comparable. The Hypex PSU has one of the lowest ripple on the market (85uVrms) Which leads me to think that the Micro-Audio PSU is very efficient!

In the audible band, the Micro-Audio is better.
From 120Hz down to 2kHz the spurious tones are less significant on the Micro Audio as well


index.php



Considering the facts: 3E Audio modules have a very capable PSSR, so any PSU with an acceptable ripple should do the trick.
In all cases, you will have to consider the choice of the power of the PSU in relation to the impedance of your speakers! This has been discussed in my shared projects.
 
Last edited:
antcollinet said:
Check out this thread by @danibaun
www.audiosciencereview.com

"Bamboo Project" : Dual Mono 3E Audio 480-1-29A Amplifier

Hi amigos, Following the ASR review of the 3E Audio 480-1-29A Module, I decided to roll up my sleeves and show you that with a little elbow grease, you can create a very beautiful amplifier based on these nice 3E Audio modules. I called this project, "Bamboo"> the pictures will speak for...
www.audiosciencereview.com www.audiosciencereview.com
Click to expand...

daniboun ) not danibaun ))))) :)
 
Definitely will do. Happy how much cheaper this is compared to other options and how compact it's compared to my current setup.
 
Powers on, no faults. Going to solder the rca connects next. Running this as se mode. Seems to me the mornsun might be a bit noisy for me to use as a very close amp setup. We will see when all is done. So far nothing blew up.
 

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Slight turn off pop, and some noise through the tweeter >_<. Maybe I need a better SMPS?
 
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