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Test & Measurement interface for Soundcard
Test & Measurement interface for Soundcard
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Old 19th June 2018, 08:02 AM   #791
cbueche is offline cbueche  Switzerland
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Hi all,

I'm in the market for an audio analyser that can do more than my poor FFT from my Siglent scope. Not really skilled yet in the area, but I need the usual things like FFT, THD measurements, etc.

I have gone through the whole thread with interest and intend to build it from Pete's PCB and panels. However, I'm working with a Linux laptop (Ubuntu) so instead of building a desktop PC an cluttering my lab with it, I would rather use an external USB sound card and ideally some Linux software. I don't mind paying for the software, but Virtualbox emulation is a pain and if I can go native I'll be happier.

Anyone has experienced USB sound cards and linux software ?

Regards,
Charles
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Old 19th June 2018, 08:37 AM   #792
phofman is offline phofman  Czech Republic
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Arta works OK in wine (direct access to alsa soundcard), I use it in my Headless Amplifier Measurement Workstation . Also Visual Analyzer 32bit Visual Analyser seems to work OK in wine, I will try to use it instead of Arta on my workstation because it offers scope view.
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Old 22nd September 2018, 01:13 AM   #793
KevinHeem is offline KevinHeem  United States
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Test & Measurement interface for Soundcard
We recently finished the Interface for Soundcard...I say WE because my nine year old son populated at least 75% of the PCB (with me hovering over his shoulder of course). It's hard to be patient and not grab the iron out of his hands. Anyway, the device works as advertised, was pretty simple to build, and all parts were quite easy to acquire (mostly copy and paste from the BOM to DigiKey and Mouser. I had a hard time debugging it at first as one of the pins on an IC was out of it's socket. This a great tool and I appreciate the hard work Peter put into it...Thank You. I could attach pics (to prove it really happened), but I think you guys already know what it looks like. Thanks Again!!!
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Old 3rd January 2019, 09:44 PM   #794
jonbon is offline jonbon  Norway
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Just ordered, collecting parts. There seems to be a shortage of the MDMV0000 at digikey, is there any alternative part or somewhere with availability (preferably in europe).

Thanks
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Old 3rd January 2019, 10:21 PM   #795
KevinHeem is offline KevinHeem  United States
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Test & Measurement interface for Soundcard
I purchased my MDMV0000 from WALKER INDUSTRIES

Don't know about shipping cost to Norway.
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Old 9th January 2019, 07:26 AM   #796
dch53 is offline dch53  Australia
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Default Soundcard interface setup with Juli@ soundcard and ARTA

Hi,

I recently completed my Soundcard Interface. It went together perfectly and it was a pleasure assembling it! I earthed the selector switch shaft and lined the box with mu-metal both as suggested earlier in this thread.

It appears to work fine testing with a signal generator and DMM. I don't have an oscilloscope at the moment so I can't be absolutely sure.

I'm trying to use the Soundcard Interface with a Juli@ sound card and evaluating ARTA for simple amplifier frequency response and THD/spectra measurements.

Not understanding how to use ARTA could well be my problem here.

I've attached the loopback spectrum.
loopback spectrum.png

Looks good and can be improved significantly by reducing the level.

If I connect-up the soundcard with the right channel as reference and select "Gen Mon" to link the sound card output to the soundcard input I should be able to measure the contribution of the soundcard interface as many others have done on this thread.

I had to reduce the input level to -12dB avoid clipping in the Time Record window. I've attached the result and as you can see it's relatively poor with THD of 0.1% and THD+N of 0.11%. At least the background noise is down to 140dB and there's no peak at mains frequency.
-12dB spectrum.png

Any suggestions as to what I'm doing wrong here?

Thanks.
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Old 9th January 2019, 07:38 AM   #797
phofman is offline phofman  Czech Republic
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Quote:
Originally Posted by dch53 View Post
Looks good and can be improved significantly by reducing the level.
Looks very typical for Juli Digital Distortion Compensation for Measurement Setup


Quote:
If I connect-up the soundcard with the right channel as reference and select "Gen Mon" to link the sound card output to the soundcard input I should be able to measure the contribution of the soundcard interface as many others have done on this thread.
Look at the card diagram. The monitoring feature feeds incoming data from inputs to output mixer, not the other way round.

Click the image to open in full size.
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Old 9th January 2019, 09:09 AM   #798
dch53 is offline dch53  Australia
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Quote:
Originally Posted by phofman View Post
Look at the card diagram. The monitoring feature feeds incoming data from inputs to output mixer, not the other way round.
Thanks for the link.

My reference to selecting "Gen Mon" was on the soundcard interface not the soundcard itself.
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Old 9th January 2019, 09:12 AM   #799
phofman is offline phofman  Czech Republic
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Thanks
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Old 11th January 2019, 10:34 AM   #800
dch53 is offline dch53  Australia
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Default Success!

Now that I better understand how to use ARTA I'm getting similar results to others.

I just need to see if I can reduce the 15dB mains bump. Interface is currently powered from a computer USB port. I thought earthing the switch shaft and mu metal shielding top and bottom would fix that.

GenMon 239mV 200mV scale.png
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