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New FIFO buffer for RPI/SBCs
New FIFO buffer for RPI/SBCs
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Old 22nd March 2017, 09:18 AM   #801
doctormord is offline doctormord  Germany
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Default Volt+ tpa3118 testing data

May i ask for THD vs. Pout (continuous plot for 20Hz/1k/6k) just for completeness? (4/8R)

Just like datasheet shows.

The board shows mainly H3/H5 (deadtime residuals)

Last edited by doctormord; 22nd March 2017 at 09:21 AM.
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Old 22nd March 2017, 09:30 AM   #802
cdsgames is offline cdsgames  Canada
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Quote:
Originally Posted by irribeo View Post
Identical frequency respons for 8 ohm load and earlier 4 ohm load.
Yeap. I looked at datasheet from tpa3116 at 1W vs 10W (fig 10 page 9) and difference of the THD+N is extremely low .
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Old 22nd March 2017, 09:31 AM   #803
cdsgames is offline cdsgames  Canada
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Quote:
Originally Posted by doctormord View Post
May i ask for THD vs. Pout (continuous plot for 20Hz/1k/6k) just for completeness? (4/8R)

Just like datasheet shows.

The board shows mainly H3/H5 (deadtime residuals)
I asked the team , they will do it.
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Old 22nd March 2017, 10:13 AM   #804
irribeo is offline irribeo  Netherlands
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Quote:
Originally Posted by cdsgames View Post
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.
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Old 22nd March 2017, 10:24 AM   #805
cdsgames is offline cdsgames  Canada
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I saw it, will check with team how is the AP setup. THD+N is different , but barely .
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Old 22nd March 2017, 10:27 AM   #806
alkasar is offline alkasar  France
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@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...
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Old 22nd March 2017, 10:43 AM   #807
cdsgames is offline cdsgames  Canada
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Quote:
Originally Posted by alkasar View Post
@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 :-)
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Old 22nd March 2017, 02:31 PM   #808
TioFrancotirador is offline TioFrancotirador  Poland
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Quote:
Originally Posted by matt_garman View Post
@cdsgames, is the RPi's 3.3V still not passed through?

One specific application where it would be handy to have the 3.3V pass through is for use with the Soekris dam1021. The Soekris dam1021 requires 3.3V input along with the i2s because it has an isolator that needs to be powered. So a "default" RPi can provide that natively, but it looks like using the Allo Kali would require a separate 3.3V supply.

(Granted, the Soekris has its own reclocker after the isolation, so in theory the Kali would be redundant anyway. Despite that, I've read subjective reports of improvements when using better I2S devices.)
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.
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Old 23rd March 2017, 04:13 PM   #809
cdsgames is offline cdsgames  Canada
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Thd+N vs Pout

8ohm : 20hz /1khz /6Khz /
Attached Files
File Type: pdf THD+N Ratio vs Pout.pdf (86.4 KB, 70 views)
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Old 23rd March 2017, 07:29 PM   #810
doctormord is offline doctormord  Germany
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Nice, thank you. Will there be 4R data available as well?
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