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Volt+ tpa3118 testing data
Volt+ tpa3118 testing data
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Old 17th March 2017, 12:48 PM   #11
cdsgames is offline cdsgames  Canada
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Quote:
Originally Posted by alkasar View Post
rise also present on the 8ohm measurements.
+1dB at 20kHz is not a big deal. It seems to indicate that the output filter has an overshoot.

Is the detailed schematic with component values availbale ?
I will ask the team to detail the filter values , for Monday
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Old 17th March 2017, 03:16 PM   #12
cdsgames is offline cdsgames  Canada
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I will ask for 8 Ohm 1W to compare.
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Old 17th March 2017, 07:18 PM   #13
doctormord is offline doctormord  Germany
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Originally Posted by cdsgames View Post
Yes we measured first at 4ohm but there is not much diff at 8ohm. We used our own SMPS at 19v better than most SMPS but still some noise on it.

Yes gain is lowest 20db and yes I think we reach (and few cases exceed) the EVM.

I hope the measurements show that our Volt+ is a well designed TPA3118.

I thought your Volt+ is "immune" to power-supply-noise"?

So in the end we are getting the performance expected from the EVM, okay. Question is, will the performance be at the same level when skipping the cap. multiplier?
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Old 17th March 2017, 08:11 PM   #14
hajj is offline hajj  Lebanon
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Originally Posted by doctormord View Post
Question is, will the performance be at the same level when skipping the cap. multiplier?
Isn't it kind of a moot question since the Volt+ comes with a built-in cap multiplier?
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Old 17th March 2017, 10:10 PM   #15
doctormord is offline doctormord  Germany
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Of course.
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Old 18th March 2017, 07:58 AM   #16
cdsgames is offline cdsgames  Canada
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Originally Posted by doctormord View Post
I thought your Volt+ is "immune" to power-supply-noise"?

So in the end we are getting the performance expected from the EVM, okay. Question is, will the performance be at the same level when skipping the cap. multiplier?

Actually , if you look closely , we beat the EVM .

I think there fair question is...can any modded board come even close to our test figures ?
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Old 18th March 2017, 08:18 AM   #17
doctormord is offline doctormord  Germany
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If i look closely, i see that you measurements are done at 20dB gain while all datasheet plots are for 26dB. So it's not comparable.
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Old 18th March 2017, 11:12 AM   #18
alkasar is offline alkasar  France
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Originally Posted by doctormord View Post
Question is, will the performance be at the same level when skipping the cap. multiplier?
why do that ? it is onboard. if it improve performance, it's a good idea.

EVM data is not published at 20dB gain. How can one be so sure results are better than the published data ? Pointless discussion without the data.


It's fair to reckon that this commercially available board has the best published measurements, without any mod. Even when compared to other cheap boards modded by diyers I have seen on this forum.
It is available for sale, for a fraction of the EVM price. That's good news for the byers.
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Old 18th March 2017, 11:31 AM   #19
doctormord is offline doctormord  Germany
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Quote:
Originally Posted by alkasar View Post
why do that ? it is onboard. if it improve performance, it's a good idea.

To see the performance impact.
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Old 18th March 2017, 11:35 AM   #20
irribeo is offline irribeo  Netherlands
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It has been measured to have 800-8kHz frequency respons, it was the best then too. At the moment the respons deviation might seem unimportant, but it points to either componentvalues being off more than 50% or still wrong measurement setup. From this measurement setup it is the best, nobody else measured like this. Or boards produced contain components more than 50% off, buy buy buy???
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