TPA3255 Reference Design Class D Amp GB

[wineds]

I got the 800w 48V unit here. $44 including shipping as I recall. There is a pot to adjust voltage and I increased it to 50v.

AliExpress

Thanks. Its interesting that the 800W is not listed in the specs table. Also 1000W is same size and only slightly more expensive than 800W.

 

[Audio Mo]

Maybe in the future. I am looking into getting these professionally assembled by a factory but that won’t be for a while.

I’m interested in a factory assembled board as well.

Let us know

Mo

 

[mordikai]

Me too

 

[Rtep2007]

In fact, it is the same for me. I prefer assembled board.

Petr

 

[xrk971]

Let’s start an assembled board interest list then. Note that BOM cost plus board cost plus assembly cost will make this not an inexpensive built amp. Just a warning that prices, depending on level of interest, might be around $200 to $250 range. Shipping will be USPS first class package tracked and insured. Typically $25 for everywhere outside US, $18CAN, about $8 CONUS.

Fully built TPA3255 Reference Class D amp GB interest list:

Name Qnty. Country

DiyJoe 2 USA

————————————-

 

[Audio Mo]

Let’s start an assembled board interest list then. Note that BOM cost plus board cost plus assembly cost will make this not an inexpensive built amp. Just a warning that prices, depending on level of interest, might be around $200 to $250 range. Shipping will be USPS first class package tracked and insured. Typically $25 for everywhere outside US, $18CAN, about $8 CONUS.

Sorry mate it dies not make economical sense!

I would buy the TI board at USD150 instead

Thanks again and good luck

Regards

Mo

 

[xrk971]

No problem. I understand - which is why I never offered it but seems people are interested. There are substantial differences between this board and the TI board. Large high current CoilCraft inductors, post filter feedback (PFFB), layout with short traces from Vdd to supply pins, 2oz copper traces, 2mm thick FRP board, rugged connectors.

 

[maty tinman]

This is with 120VAC wall plug powering an 800w (48vdc adjusted to 50v) SMPS (Aliexpress $44 LED PSU), also 20w into 3.3ohm load:

THD to dB - convert percent % to decibels dB percentage voltage % vs per cent converter THD+N total harmonic distortions calculation signal distortion factor attenuation in dB to distortion factor k in percent decibel damping - sengpielaudio Sengpiel

H2: 0.0014% -> -97 dB

H3: 0.00092% -> -100.7 dB

H4: 0.00084% -> -101.5 dB

H5: 0.00062% -> -104.1 dB


Congratulations!

 

[xrk971]

Thanks, Matty. The harmonic profile is not bad at all - quite enjoyable actually. The best Class D that I have heard.

 

[mordikai]

Fully built TPA3255 Reference Class D amp GB interest list:

Name Qnty. Country

mordikai 2 USA

 

[Kay Pirinha]

Sorry mate it dies not make economical sense!

I would buy the TI board at USD150 instead

Note the TI's main disadvantage: It has bulky components on either side of the PCB.
Best regards!

 

[Arnandsway]

Hi XRK, where could I find a complete list of the necessary components?

 

[xrk971]

Post 103 has zip file of BOM and also link to Mouser shopping cart.

TPA3255 Reference Design Class D Amp GB

 

[Rtep2007]

If the price of a complete board is about $ 200-210, it's still a better price for me than buying it in parts.


Petr

 

[blossom]

I would be interested in 1 assembled unit.

 

[xrk971]

Fully Assembled TPA3255 Reference Class D amp GB interest list:

Name Qnty. Country

xrk971 8 units USA
Mordikai 2 units USA
Rtep2007 1 unit CZR
Blossom 1 unit NZ

 

[grahamgraham]

I'd be interested in 1, price dependant of course. UK.

 

[xrk971]

I would say count on $200ea minimum. The BOM alone is $135. PCB manufacturing cost, NRE cost for automated assembly and per board assembly cost. The only way the cost is low is if we make 5000 of them

This amp is not about low cost. It can’t compete with $55 AliExpress eBay amps, or even the $75 3e amp.

So don’t look at it as saving money. DIY is about getting a unique and awesome performing piece of tech.

 

[xrk971]

Fully assembled TPA3255 Reference Class D amp Interest List

xrk971 24 units USA
Mordikai 2 units USA
Rtep2007 1 unit CZR
Blossom 1 unit NZ
Grahamgraham 1 unit UK

I just had an accelerated need for a bunch of these amps for an upcoming project.

 

[grahamgraham]

I would say count on $200ea minimum. The BOM alone is $135. PCB manufacturing cost, NRE cost for automated assembly and per board assembly cost. The only way the cost is low is if we make 5000 of them

This amp is not about low cost. It can’t compete with $55 AliExpress eBay amps, or even the $75 3e amp.

So don’t look at it as saving money. DIY is about getting a unique and awesome performing piece of tech.

No, I understand, but everyone has their limits