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Test & Measurement interface for Soundcard
Test & Measurement interface for Soundcard
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Old 12th March 2019, 06:02 PM   #881
Rory Christ is offline Rory Christ
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Location: Milwaukee, WI
Originally Posted by Rax View Post
I was going to effusively report lower noise figures after Cu shielding and grounding the shaft last night, but at the end of it I thought it'd be "interesting" to use the wrong supply (identical jack) - 12V from my headphone amp - to supply it.
I would start by checking the input and output voltages on the DC-DC converter. The data sheet says the absolute maximum input voltage is 10V, so it may have been damaged from having 12V applied to it.
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Old 15th March 2019, 06:41 PM   #882
Rax is offline Rax  United States
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Well, that's interesting. It seems the part I would have bet some good money would withstand this if any part would, failed - the ESD protection diode. It would short the power supply through the fuse, and keep the interface offline.

Anyway, I seem to have lowered THD+N by about 0.01%. I used copper foil for shielding, and grounded also the shaft. Is this what others have observed?

I will go next to the caps suggested.
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File Type: png 1kHz Spectrum After shielding and shaft grounding.png (582.8 KB, 136 views)

Last edited by Rax; 15th March 2019 at 06:44 PM.
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Old 16th April 2019, 09:41 PM   #883
mnichols30030 is offline mnichols30030
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Default Another data point / Sound Card

I just completed Peter Millett's sound card interface. Still on the learning curve with ARTA and calibration. The only addition was to use copper tape to line the upper half of the box.

I am using an ASUS Essence STX II sound card. The following is the spectrum looped back through the sound card interface.

Still have to calibrate the AC RMS voltmeter and continue exploring this setup.


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File Type: jpg LoopBackwSoundCardInterface.JPG (69.6 KB, 67 views)
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