E-MU 0404 USB Modification? - Page 5 - diyAudio
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Old 23rd May 2010, 08:22 AM   #41
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I have tested all the output stage with CS4397-98 chips.

The Solid stade is not very good as sound, too digital.

The best is pure vacuum tubes but it is the more expensive.

The transformers solution is fast and good but it can lost some little details also if the sound is the more natural.
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Old 24th June 2010, 02:11 AM   #42
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Does anyone know about the capacitors on the input side of this device? I see there is a trio of large 47 uF, 63V electrolytics on each input channel and a smaller fourth capacitor near them. I suspect the large electrolytics have something to do with phantom power blocking. As I am mainly interested in the line input, I would like to re-cap or bypass any extraneous caps on the input side.

Also, I had the headphone output crap out on me during a live concert recording (not a good time for the headphone output to crap out). The audio was "static-y" and full of crackle. I replaced the headphone caps with Nichicons and the problem has not reoccurred.
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Old 9th October 2010, 02:45 AM   #43
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Quote:
Originally Posted by Salas View Post
I have seen high output noise on my scope too from my Emu tracker. Even sine waves produced by it are obviously dirty VS my analogue old generator on the scope's screen. But when looped with measurement software, it ignores it, and it compares very well for THD readings and SNR of DUT VS normal measurement equipment. A guy in a local forum made an extensive analysis and comparison with his HP gear, and beyond square wave generation that was ringing, he found the EMU very useful when looped with measurement software, but not as a stand alone generator. Especially not beyond 48kHz sampling rate. Big noise starts at 35kHz and he made a filter. That helped if there is need for an AF only capable stand alone generator and it must be the EMU, for economic and utilization reasons if its already in hand. They also proposed buffered attenuation for its input so it can be used on measuring high voltage signals too.
are there any 0404 mods that are known to specifically improve the sound card when being used in loop mode with RMAA (SNR, THD, etc.)?
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Old 9th October 2010, 02:51 AM   #44
Salas is online now Salas  Greece
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None that I came across.
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Old 26th November 2010, 05:00 PM   #45
FOXYE is offline FOXYE  Israel
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Someone tried to replace the original power supply with good linear power supply?
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Old 26th November 2010, 05:54 PM   #46
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yes, I have done it
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Old 26th November 2010, 06:00 PM   #47
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It doesn't do anything, and it shouldn't. In goes +5VDC which then gets converted in several parts of the board to various positive and negative voltages. I've provided details elsewhere (see the wiki) about each place where it gets converted, and by what IC. Those converters introduce all sort of high frequency garbage into the rest of the circuit.
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Old 26th November 2010, 06:13 PM   #48
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I am using a normal LT1086CT5 regulator and the center pin of the connector is the positive
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Old 26th November 2010, 06:25 PM   #49
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Look at the Power converters section where I listed them all and the voltages that they convert to.

E-MU 0404 USB mod wiki - diyAudio
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Old 26th November 2010, 06:27 PM   #50
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audiodesign, did it made the sound better?
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