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TPA3255 Reference Design Class D Amp GB

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#823
Name / Units / Country
—————————————
Plott / 1 amp / Austria / order placed
ugly woofer / 1 amp / order placed
yoaudio / 1 amp / order placed
rhing / 1 amp / USA / order placed
bkhatton / 1 amp / USA / order placed
turion64 / 1 amp / USA/ order placed

Etsy indicates 8 of 9 units taken but only 6 names here...
 
#827
xrk971 said:
No worries. Glad you are getting another one. It’s a great sounding amp and I still enjoy mine almost everyday.
Click to expand...
I bought just the PCB last time X....hand soldering all those SMDs was way too tedious and I did something wrong somewhere so I opted for a fully functioning unit this time.

Any thoughts of mimicking the unique PFFB in the PA5's little black sealed module?
 
#828
There was a tear down on that module so the details of its construction are available if you look here:

https://www.diyaudio.com/community/...s-a-modification-worth-it.380233/post-7149020

1671479039525.png


gamerpaddy said:
“Lots of feedback and two gain stages in series (NE5532 and OPA1612A). Topping is using different parts from what the Ti document recommends.
instead of R_fb 33k, its using 9.9k (spread over 3x3.3k resistors) and R_fb_gnd is 750 ohms instead of 10k.”

The gain and feedback settings are a bit different but the topology is pretty much the same. You can try to copy those values if you wish but it was optimized for TPA3251.
 
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#829
turion64 said:
Name / Units / Country
—————————————
Plott / 1 amp / Austria / order placed
ugly woofer / 1 amp / order placed
yoaudio / 1 amp / order placed
rhing / 1 amp / USA / order placed
bkhatton / 1 amp / USA / order placed
turion64 / 1 amp / USA/ order placed

Etsy indicates 8 of 9 units taken but only 6 names here...
Click to expand...
Comparing above list with previous list:
Name / Units / Country
————————————————
turion64 / 1 amp / USA / order placed
Martial31 (Etsy) / 2 amps / USA
Vishal Devgon/India/ 1 stereo amp
Dr Rasta / 1 amp / USA
Saniasin/ 1 amp / ?
Bkhatton / 1 amp / USA / order placed
Rhing / 1 amp / USA / order placed
ugly woofer / 1amp / USA / order placed
Plott / 1 amp / Austria / order placed
yoaudio/ 1 amp / USA / order placed

We see that Vishal Devgon, Dr Rasta, Saniasin, and Martial31 have not placed their orders yet.
 
#832
xrk971 said:
It is ready to run (use): provide PSU and connect audio in and speakers.

If you mean ready to use PSU and chassis and buffer included all assembled then may I suggest the commercial LSA Warp-1 amp. Uses the same core and has great reviews, for example, on line written reviews and video review.
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Watching Thomas' review is so much fun. What an animated and gifted video reviewer.

If I perfect my hot air station skills, I might go for your TPA3255 board. This weekend I'm going to practice on the headphone protect board, then move on to the three Panel Mount BTSB boards I have. If they test fine (I have a Keysight scope with Bode Plot capability), perhaps the TPA3255 is in the future.

Best,
Anand.
 
#833
Hi Anand,
I have hand soldered two TPA3255 boards and would not want to do another one. But there is a certain soothing satisfaction to it like knitting or wood carving etc. a good manual solder paste dispenser can make things much easier than a plain hypo syringe.

This is a very good investment to prevent hand cramping and better solder application:
https://a.co/d/6Ep6N2R

Use these nozzles:
https://a.co/d/gEnKSCU
 
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