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Class D Switching Power Amplifiers and Power D/A conversion

TPA3255 - all about DIY, Discussion, Design etc.
TPA3255 - all about DIY, Discussion, Design etc.
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Old 24th June 2019, 06:54 AM   #1281
goodguys is offline goodguys  United Kingdom
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Quote:
Originally Posted by diytoon View Post
one is considerably cheaper than the other (good for me) but does the "you get what you pay for" maxim apply here?
Any advice welcomed
I have both boards and it all depends on what you are looking for...
Wiil it replace a mediocre amp, both amps are fine and will give you some good sound...
If it has to replace a top class musical amp...I would not go this way and keep that amp...
If you just want to check what class d amps can do today (that is why I bought a few) and like to experiment a bit...this is big fun...sometimes I am surprised how good these cheap amps can sound...but I have to be honest, this is not the ultimate amp I am looking for...(but as a tubeman I might be a little biased)
I would give the 3e-audio a plus because of the quality...@100 dollar
But the yj board is less than half that price and works/sound very similar...
If it is an experiment you are looking for, go for the cheapest...if class d and tpa3255 is good sounding for you in your system you could consider upgrading later...there will be other boards with tpa3255 the coming months...I think.[/QUOTE]


What is the best voltage for the yj boards. It states in the ebay description to use 50volts, most on here are using 40 volts, what do you think about going lower as i heard higher voltages can increase distortion, would lower voltages lower distortion and give better sound. 40 volts sounds like you are running the boards at the higher end of the rating
Thanks!

Last edited by goodguys; 24th June 2019 at 07:02 AM. Reason: typo
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Old 24th June 2019, 08:36 AM   #1282
Kay Pirinha is online now Kay Pirinha  Germany
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A higher supply voltage generally increases headroom. So why should it increase distortion?


Best regards!
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Old 24th June 2019, 04:52 PM   #1283
doctormord is offline doctormord  Germany
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Due to increased quiescent current and higher dV/dt. The output stage is always switching up to full voltage, so your dV/dt is generally higher if ton/toff is constant. This will raise radiation as well which "may" induce noise/distortion/whatever in surrounding circuitry.
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Old 25th June 2019, 06:17 AM   #1284
goodguys is offline goodguys  United Kingdom
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I heard class d's generally increase distortion quite dramatically at the top end of their voltage range.
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Old 25th June 2019, 01:05 PM   #1285
doddstar is offline doddstar
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So is there an ideal voltage for the tpa3255 or does it vary with implementation?

And has anyone tested the distortion at various voltages?

I have a power supply that can be set over a fair voltage range. It would be handy to know the ideal voltage for 3e Audio's tpa3255 containing EAUMT-0260-2-A.

How would one go about testing this?
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Old 25th June 2019, 01:49 PM   #1286
Turbowatch2 is offline Turbowatch2  Germany
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Often it seems to be a good idea to look at the data sheet of a certain D-chip.
There you can see distortion at different loads, supply voltage etc.
These firures should be achievable with any implementation that fits the circuit board the manufacturer designed.
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Old 25th June 2019, 03:14 PM   #1287
chermann is offline chermann  Austria
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yep....TPA3255 page 11 - - Figure 8:Power-Voltage-THD for 1%
Attached Images
File Type: jpg Voltage-Power at THD1.JPG (75.2 KB, 172 views)

Last edited by chermann; 25th June 2019 at 03:17 PM.
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Old 26th June 2019, 06:57 AM   #1288
goodguys is offline goodguys  United Kingdom
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Do you have an opinion on the e3 audio 3255 vs B&O icepower 125asx2.
Have you heard anything or have a link to where this has been discussed, i can't find anything.
Thanks!
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Old 26th June 2019, 07:38 AM   #1289
chermann is offline chermann  Austria
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Quote:
Originally Posted by goodguys View Post
Do you have an opinion on the e3 audio 3255 vs B&O icepower 125asx2.
Have you heard anything or have a link to where this has been discussed, i can't find anything.
Thanks!

hi goodguys

No sorry...

You are posting the same in different threads....i see you are in flame with class D
give us time to answer .....

i personally start with TPA32xx (3116) chips and i am happy. actually i am not interested in invetigate different types .e.g.-ice-anaview- IRS2029..etc. to compare. yes....the class D amps are very interesting but now its too much for me to go a little bit deeper with all the kinds of class D.

my freinds are speakers builder (Disco M) and active in the german thread (...name = Herr der Ringe) and they do not care about amps and electronics...
the only listening test i had was with some big anaview boards and it was on my speakers dissapointing for me -harsh - starnge, no controlled bass- bad voices and unreal instruments - at home my speakers/amps sounding fine - more like class AB/ A

but here are some guys with a lot of technical experience with different types and listening tests.

chris

Last edited by chermann; 26th June 2019 at 07:45 AM.
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Old 26th June 2019, 07:49 AM   #1290
chermann is offline chermann  Austria
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additionally....

You asking about the YJ TPA3255 or the 3e boards.
if you want to start and modding the amp - go for the cheap chinese bards - about 45 euros.
if you are not itnerested for modding --> start with better engineered development amps board then buy TI or the 3E boards.
i have a TPA3251 TI EVM board with the 50% discount (actually stopped)
so the price of a 3e board i very fair and as doc (developer) well done.

chris
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