Yeap. I looked at datasheet from tpa3116 at 1W vs 10W (fig 10 page 9) and difference of the THD+N is extremely low .
Your 1 watt into 4 ohm and 1 watt into 8 ohm have same frequency respons, pages 8 of 11 for both.
@cgdsgames : Thanks for the work.
Excellent results @400Hz, confirm an excellent implementation
AP reports are not easy to read for non educated eyes. You should put your data together in a more readable form and publish on your website. You can be proud of them.
As diyers, we'd like to understand and could try new designs and mods endlessly just to find out about the differences...
Excellent results @400Hz, confirm an excellent implementation
AP reports are not easy to read for non educated eyes. You should put your data together in a more readable form and publish on your website. You can be proud of them.
As diyers, we'd like to understand and could try new designs and mods endlessly just to find out about the differences...
@cgdsgames : Thanks for the work.
Excellent results @400Hz, confirm an excellent implementation
AP reports are not easy to read for non educated eyes. You should put your data together in a more readable form and publish on your website. You can be proud of them.
As diyers, we'd like to understand and could try new designs and mods endlessly just to find out about the differences...
Alkasar , we appreciate every kind word . We worked hard on the Volt+ and its our great team from India that did the ground work with a bit of help from us.
Every comment like this is sent to them. Thx you.
We appreciate this community and will share our own "secret sauces" . We are all learning, we are all diyers.
A bottle of St-Emillion thats what waiting for me tonight
I also found Soekris sound quality to be dependent on I2S signal quality. The better the I2S signal the better sound you get out of Soekris. Seems like soekris reclocking is inefficient.
I am also waiting for Kali version 2 with 3.3V pass through to power Soekris isolator.
Are the measurements posted here:
http://www.diyaudio.com/forums/vendors-bazaar/305243-volt-tpa3118-testing-data-5.html#post5028480
done at 19V or a higher voltage?
http://www.diyaudio.com/forums/vendors-bazaar/305243-volt-tpa3118-testing-data-5.html#post5028480
done at 19V or a higher voltage?
You are very precise by looking at that graph. 26W
I get slightly lower . But yes seems that they used higher voltage. I know the smps has a +- (10-15%) but frankly we work in different offices and a while back they told me we use 19v. Seems they used 5 to 10% more.
Stepped attenuator for Volt+ released
10k , 0.1% thin film resistors , 25ppm
https://allo.com/sparky/stepped-attenuator.html
Next week we will test the Volt+ using the new attenuator. All test on Volt+ were done with POTs . Lets see if we get any improvement ..
10k , 0.1% thin film resistors , 25ppm
https://allo.com/sparky/stepped-attenuator.html
Next week we will test the Volt+ using the new attenuator. All test on Volt+ were done with POTs . Lets see if we get any improvement ..
Close yes - because i don't have an AP to work with and i can't specify the uncertainty of measurement. I also don't know what integration time and window function the AP is using for the FFT. Beside this, i don't have exact 8R load resistors.
(Lastly, i compared at 1kHz only)
The results are reasonable as a colleague did measured his TPA3118 implementation in the same manner with "close" results.
Power supply is a Korad KA3005D. (Linear)
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Our testing is done with SMPS. I think its slightly unfair to use a linear power supply and compare the data versus one using SMPS..generally speakingSecond , you are comparing BTL with PBTL boards. You know that PBTL have better specs.
Even with that, from 0.1W to 22W our boards show better THD+N.
So we will take it.