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Class D Switching Power Amplifiers and Power D/A conversion

TPA 3250 somebody is listening ?
TPA 3250 somebody is listening ?
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Old 4th December 2017, 01:34 AM   #1
frazier is offline frazier  United States
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TPA 3250 somebody is listening ?
Default TPA 3250 somebody is listening ?

FX-Audio has introduced an amp based on the TPA 3250 chip. Under $70 got to be kidding right? Following the diy efforts on the TPA 32xx chips I think our Chinese friends presented this particular amp with the note,[ preamp uses OP amp NE 5532 : Replaceable design suitable for DIY,] for our benefit .- Maybe-. Has anyone checked this out? thanks
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Old 4th December 2017, 02:25 AM   #2
wushuliu is offline wushuliu  United States
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You don't even provide a link? No idea what you are talking about.
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Old 4th December 2017, 03:29 AM   #3
Yatsushiro is offline Yatsushiro  United Kingdom
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FXAUDIO FX502SPRO TPA3250 Class D Digital Amplifier Hi-Fi Stereo Audio Power Amp | eBay
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Old 4th December 2017, 06:52 AM   #4
frazier is offline frazier  United States
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TPA 3250 somebody is listening ?
Thanks Yatsushiro , Sorry I didn't include the link. Thought it was an interesting note in the sales description.
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Old 4th December 2017, 07:17 AM   #5
KaffiMann is offline KaffiMann  Norway
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Very good price, and it`s including a 24v 4a psu. Caps are 35v it seems.
They claim 35w 8ohm and 70w 4ohm at 0.01% non-specified distortion?
Is that a voltage regulator/smoothing circuit near the power socket?

Might be a tpa3116 killer. Tempted to replace the one in the children's room, it will have to wait until January/February sometime.

Last edited by KaffiMann; 4th December 2017 at 07:21 AM.
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Old 4th December 2017, 07:19 AM   #6
hormilo is offline hormilo  Slovenia
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Is this better than tpa3116?
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Old 4th December 2017, 08:10 AM   #7
KaffiMann is offline KaffiMann  Norway
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In short: The TPA3250 is better than the TPA3116.

Is it much better? That depends on your application.
It is slightly more powerful, you can get probably 2x25w nearly clean power (guesstimate somewhere between 0.01-0.001% distortion) in 8 ohm with the included PSU.
Whereas the TPA3116 also gives 2x25w in 8 ohms but at 21V max, and 10% distortion.

It seems to be a slightly better designed PCB, there may be some power conditioning going on (not tested), there is a pre-amp stage containing the well known NE5532, seemingly well optimized for modern use at 0.775mv specified input voltage.
Many TPA3116 seem to be set to very aggressive gain settings making it more noisy than it has to be, and there is often no pre-stage on the stuff sold cheap on ebay.

Last edited by KaffiMann; 4th December 2017 at 08:12 AM.
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Old 4th December 2017, 08:32 AM   #8
Yatsushiro is offline Yatsushiro  United Kingdom
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Quote:
Originally Posted by hormilo View Post
Is this better than tpa3116?
Define 'Better', as Doctormord might say...

I prefer my TPA3250EVM over a selection of TPA3116 and TDA7498 amps I have; RPi with Piano DAC source, feeding a set of Q Acoustics 2050i speakers.

I also have an IcePower 50ASX2, which is different to the 3250, still assessing, yet to come to a conclusion...
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Old 4th December 2017, 09:55 AM   #9
TNT is offline TNT  Sweden
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Aircoils... 8-o

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More distortion to the people!
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Old 4th December 2017, 10:36 AM   #10
FauxFrench is offline FauxFrench  France
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TPA3250 is from the top-of-the-range series. As I would expect from what I see in the advertisement, cooling may be a problem. A rather small heatsink enclosed in a small cabinet without vents - technically not optimal. There is this general perception that class D amplifiers do not have cooling issues. This is not true, they are just less than for class AB amplifiers.

As someone wrote about the TPA3116D2: it may make noise ("hiss"). I have such a TPA3116D2 amplifier board and initially a 50K potentiometer was used. I shunted the TPA3116D2 inputs (at the output from the potentiometer) with 4K7 resistors and the "hiss" disappeared.
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