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USB sound card for audio spectrum analysis
USB sound card for audio spectrum analysis
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Old 24th April 2016, 05:03 PM   #181
SY is offline SY  United States
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Hp, did you measure third harmonic of the 10k? Thanks.
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Old 24th April 2016, 06:41 PM   #182
HpW is offline HpW
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Quote:
Originally Posted by SY View Post
Hp, did you measure third harmonic of the 10k? Thanks.
Well, you may know, may you read on the later "Low-distortion Audio-range Oscillator"... topic..

The real THD of the LDO is usual lower as the LNA &ADC shows up! This means, a direct measurement, as FFT does, will show you a Brut Force measurement with the underlying LNA & ADC performance! Also will show you the phase noise around the fundamental signal.

In other words, the THD3 or THDxx may show -120dB and really is may on -140dB. To get into this real THD, a additional filtering of the Har1 is needed / required. Look at the later Samuel Groner's "Low-distortion Audio-range Oscillator" measurement.

Hp
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Old 25th April 2016, 02:02 AM   #183
vicnic is offline vicnic  Latvia
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Originally Posted by HpW View Post
Here some measurements using your lovely LDO's...

And it will always be the hard part with the input LNA & best ADC. And finally for a DIY, to effort such HW/SW or even to build with the existing knowledge such HW.

Hp
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Old 25th April 2016, 06:41 AM   #185
mkc is offline mkc  Denmark
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USB sound card for audio spectrum analysis
Hi Victor,

Thank you. You have removed the potentiometer from the left channel also. Have you done this to make fixed gain?

Mogens
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Old 25th April 2016, 11:41 AM   #186
vicnic is offline vicnic  Latvia
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Originally Posted by mkc View Post
Hi Victor,

Thank you. You have removed the potentiometer from the left channel also. Have you done this to make fixed gain?

Mogens
Yes, potentiometers was also removed. Previously, I done similar job for both channels, but later, when I can't get good results from the left channel, I blocked it. Gain is fixed. I already have the external divider for the level changes.

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Victor.
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Old 25th April 2016, 11:56 PM   #187
vicnic is offline vicnic  Latvia
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One correction of mistake. R28 new value is 6.8k. It is not very significant, but has an effect on the gain.
http://content4-foto.inbox.lv/albums.../0202schCc.jpg

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Victor.
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Old 16th March 2017, 05:15 AM   #188
tjstyle is offline tjstyle  Indonesia
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Impressive, below -130db.
are you use your your low noise 1khz oscillator for feeding the signal to E-MU0202?

Quote:
Originally Posted by vicnic View Post
Wish to tell you little about one amazing result with the E-MU 0202. Not far ago got this card from the ebay auction for . I was planning this for my laptop as spectrum measurement tool. This USB sound card uses AK5385 as ADC. The chip is semi compatible with the AK5394, and I thought, that maybe I can replace the ADC chip, if it needed, but seems that is not needed. After one working day, some changes in the buffer amp and little tricks I got wonderful results from the right channel of the ADC. The left channel was more worse (seems that the chip internal problems), and I blocked it. As result I got this relatively small "magic" box, and the nice spectrum picture:
http://content32-foto.inbox.lv/album...02/0202out.jpg
http://content32-foto.inbox.lv/album...2/1kHz0202.jpg
http://content32-foto.inbox.lv/album...02/0202ins.jpg

Victor.
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Old 30th March 2017, 10:12 AM   #189
stajo is offline stajo  Sweden
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USB sound card for audio spectrum analysis
Indeed an impressive result with the EMU0202USB. Has anybody tried the 0404USB?
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Old 30th March 2017, 11:23 AM   #190
soongsc is offline soongsc  Taiwan
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I just started playing around with the Babyface Pro, seems quite impressive for a device this size.


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