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Old 29th April 2012, 10:03 PM   #21
TheGimp is offline TheGimp  United States
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I'll set up a Google Docs for files so they can be saved for future access.

I'm working on a spreadsheet with current demand of the chips for comparison to actual current demand.

I powered mine up today and was not disappointed.

I think the designer actually did a pretty good job on it with relatively few areas for improvement (other than changing to better components). The SOT233 regulators are not low noise and the data sheet shows them designed for use in SCSI termination, Battery Chargers, etc. However, the use of 78/79xx pre-regulators eliminates a lot of power supply noise.

Last edited by TheGimp; 29th April 2012 at 10:23 PM. Reason: Link didn't work. I'll figure it out.
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Old 29th April 2012, 11:12 PM   #22
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I just replaced the 100uF after the 78/79xx regs with Rubicon 1000uF. Now there is enough "umpfh" for the OpAmp stage. Will post measurements.
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Old 29th April 2012, 11:36 PM   #23
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Someone let me know if this link works. It should show 3 files, the top and bottom pictures and the schematic.

https://docs.google.com/#owned-by-me
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Old 30th April 2012, 02:59 AM   #24
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Nope, not good. the link as it is, it requires to sign on and then sends me to my documents.
As for the 1000uF instead of 100uF on output of regs - the bass sounds like it should be on my headphones. Maybe for line level 100uF was OK, but for headphones definitely was needed more storage.
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Old 30th April 2012, 03:20 AM   #25
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I guess I need to read some docs to figure out how it works.

https://docs.google.com/file/d/0B6gN...hUX3VSUzQ/edit

Lets see if this works.

By the way,

How do we go about measuring the performance of a DAC?

Wave files will play 44.1K through media player. But how to get 96KHz output from a windows pc?

I've got AudioTester which will go to 192Ks/s, but it uses the sound card for both input and output. I can measure the output of the DAC feed into the audio card with AudioTester, but it won't drive the USB output.
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Old 30th April 2012, 03:26 AM   #26
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That works.
I measure mine with my soundcard: E-MU1820m.
I don't have the auxiliary digital I/O and via PCI coax it cannot output 192kHz (only on ADAT). It has ballanced inputs so I have to short one of the sides to ground to input unballanced signals.
You can add those files. First two are from Lisa (ljm).
Last one is the recomended analog out stage from datasheet.
Attached Images
File Type: jpg LJM-USB DAC 9V电源部分.jpg (58.1 KB, 640 views)
File Type: jpg LJM-USB DAC 元件图.jpg (142.0 KB, 639 views)
File Type: png recomended_analog.PNG (43.3 KB, 632 views)

Last edited by SoNic_real_one; 30th April 2012 at 03:32 AM.
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Old 30th April 2012, 12:00 PM   #27
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I've got the M-Audio Audiophile 192 which does support SPDIF so I should be able to test that.

MY issue is when testing USB input. What do I need under windows (XP-Pro) to drive it with to get a 92K sample rate source out of the USB port. And, what to use as the file for testing? Do I need to record test tones with the sound card set for 96K sample rate, and play them back via USB?


M-AUDIO - Audiophile 192 - High-Definition 4-In/4-Out Audio Card with Digital I/O and MIDI

I'm using AuidioTester, which supports up to 192K sample rate, but does not seem to support USB.

audioTester


Thanks for the additional data, I'll upload the files tonight. I can't access Docs from work.

I just looked at the Audio Tester site, and it looks like the latest release supports USB devices. I'll have to download the release and try it.

If that works, I only need to get some high sample rate music for testing with.

Last edited by TheGimp; 30th April 2012 at 12:08 PM.
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Old 30th April 2012, 10:06 PM   #28
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I don't think you will able to test USB past 16bit 48kHz - that's what I did in the first post of this tread.
For WinXP you might need drivers.

Last edited by SoNic_real_one; 30th April 2012 at 10:16 PM.
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Old 1st May 2012, 12:35 AM   #29
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Yes, the CS102S is a USB 1.0 device and does not work above 20KHz or 44.1ks/s, but I have another board that does hence the desire to be able to test to 192Ks/s. Sorry abut not making that clear.

Files are uploaded.
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Old 1st May 2012, 12:56 AM   #30
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On the above link, I can see only the first pdf that you added.
PS: On USB (CM102S+) works ONLY at 16/48. Doesn't have 44.1kHz capability.

Last edited by SoNic_real_one; 1st May 2012 at 12:58 AM.
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