TPA3251/55 High Power Class D Amplifiers

Thomas0322 · « **Reply #100 on:** 14 Jun 2020, 04:30 pm »

I will likely pick up one of the 3255 amps on eBay. I am covered on the power supply. Replacing op amps is new to me. I'd like to try upgrading, but I don't know about that. I have seen the MUSES02 recommended. I looked on eBay and within MUSES02 there are a number of choices at very different price points. Perhaps someone knows of a good article for guidance on this. I did not find it. Recommendations for a good replacement op-amp will be appreciated.

chips666 · « **Reply #101 on:** 14 Jun 2020, 06:04 pm »

https://www.diyaudio.com/forums/class-d/276982-tpa3251d2-128.html

Hello,
Look at this thread as from page 128 (bottom) and on ...
several pages about opamp rolling
Enjoy...

xschop · « **Reply #102 on:** 15 Oct 2023, 07:08 pm »

Has anyone added a 12VDC brushless fan to the Aiyima A07? I'm building a custom case and was curious if adding a DC/DC buck converter internally would introduce noise.

FullRangeMan · « **Reply #103 on:** 15 Oct 2023, 07:18 pm »

Quote from: xschop on 15 Oct 2023, 07:08 pm

Has anyone added a 12VDC brushless fan to the Aiyima A07? I'm building a custom case and was curious if adding a DC/DC buck converter internally would introduce noise.

I would not wish test it myself, I would use a aluminium heatsink.

xschop · « **Reply #104 on:** 15 Oct 2023, 07:33 pm »

To iterate, I meant I would jumper off the supplied 36V power supply, not from anywhere on the A07 board itself.

I tested the brushless fan with a 9V battery and it flows great with no noise itself.

FullRangeMan · « **Reply #105 on:** 15 Oct 2023, 11:06 pm »

I would use a 120V fan connected to the wall, not connected to the amp supply.

xschop · « **Reply #106 on:** 16 Oct 2023, 03:35 pm »

Ok. I'll err on side of caution and not use the fan for the A07 board as it seems to be cooling just from convection with heat sink fins placed vertically.

FullRangeMan · « **Reply #107 on:** 16 Oct 2023, 03:59 pm »

If you live on a cold área not need fan IMO.

zek · « **Reply #108 on:** 5 Dec 2023, 08:49 pm »

Quote from: xschop on 15 Oct 2023, 07:33 pm

@xschop Have you finished your project?

xschop · « **Reply #109 on:** 10 Dec 2023, 08:40 pm »

Case is machined and waiting on CNC lathe again for dial completion. I really like how the whole case acts as a heat sink....

Alain Arseneault · « **Reply #110 on:** 10 Dec 2023, 09:17 pm »

Hi,
I like people that build their own stuff.
I will follow with interest this project.
Thanks for sharing.

Double A

zek · « **Reply #111 on:** 10 Dec 2023, 10:56 pm »

@xschop Very well done, congratulations on your enthusiasm.

xschop · « **Reply #112 on:** 11 Dec 2023, 06:14 pm »

Thanks gents. I have been wanting to design an amp case like this for awhile for aesthetics and function. I really like the sound of this Class D amp and it deserves a custom case.

The design goal is to have all hardware/fasteners hidden with a minimalist appearance and have ability to swap in different amp board later if I want....

I was running it 3/4 volume throttle on the shop speakers all weekend and it never skipped a beat. I could feel the warmer air circulating through lower vent holes by simple convection. Don't even need a fan running in this unit...

xschop · « **Reply #113 on:** 30 Dec 2023, 06:30 pm »

Fine tuning the dial interface/fitment. A couple thousandths each side is the key to smooth-as-butter operation

xschop · « **Reply #114 on:** 31 Dec 2023, 02:38 pm »

Wanted the dial to mimic my favorite museum watch....Will do final assembly today. Happy New Year everyone....

xschop · « **Reply #115 on:** 5 Jan 2024, 08:15 pm »

Been running the XS-8TL's with this amp for better part of the last week with my phone DAC and FLAC files.
Barely gets warm running them half volume on the dial.

I took the dial back off and reset it to 6'oclock being zero.

WAF is at 100% too as opposed to the amp and CD player in the living room.

Here's a pic where I removed the fan so you can see direct airflow path to heatsink radiator.
I also added 3/8" height rubber feet

FullRangeMan · « **Reply #116 on:** 6 Jan 2024, 12:47 am »

Too big.

S Clark · « **Reply #117 on:** 6 Jan 2024, 04:17 am »

Sure would be a helluva lot easier to put it in a Folgers coffee can.... get about the same shielding effect.

xschop · « **Reply #118 on:** 6 Jan 2024, 04:11 pm »

Quote from: FullRangeMan on 6 Jan 2024, 12:47 am

Too big.

Here are the base dimensions...

I figured out how to upload pics here (I think). It takes up 1/4 the space that my restored Onkyo A8017 amplifier did. It sounds every bit as clear and powerful too.

FullRangeMan · « **Reply #119 on:** 6 Jan 2024, 10:03 pm »

Nice, thank you