E-MU 0404 USB Modification? - Page 7

SoNic_real_one · 5th December 2010, 11:27 PM

There is about the beats beween them are at 1kHz and harmonics at 2, 3, 4...
But when you are listening MUSIC, the beats beween notes are SUPPOSED to be there, so it is OK to be played. I wasn't reffering to those but the "extra" ones above 20kHz range. Listen to a sine shaped 14kHz signal and then one that is square.

Anyway, I am sure that LM4562 will be fine even with a 30kHz signal in the I/V or filter stages of a DAC.

FOXYE · 12th December 2010, 06:44 PM

Any idea how to bypass the internals regulator that powers the DAC and digital receiver with good psu?

lwif · 14th January 2011, 09:08 AM

Here is my recent post on the wiki for e-mu mod :

"
I would be very interested to see photos of the pcb in the article. It will ease understanding and help choosing this platform for mods.
I am thinking of removing all regulators and replace them by good ones, that is no switching regulators. It should be even possible to put batteries for some portions (li po seems to be the buzz).
Can we see the clock ? Is it possible to uprgade it with good ones ?
"

Anybody can post good photos of the pcb, or part of it please ? We need to see the different regulators and the clock.

Thanks for your work and attention.

analog_sa · 3rd February 2011, 04:05 PM

Huge thanks to Audiodesign for suggesting those simple mods.

The improvement is almost unbelievable. I used an LL1674 connected as 1+1:2 and later on added an external regulated 5v. Both had a substantial, entirely positive audible effect. The only additional and relatively easy step i can think of is raising the 5v analog supply pin of the dac chip off the board and supplying clean regulated voltage directly to it with possibly some nice local decoupling. The dac is now comparable to my 1794 dac with resitor/transformer IV stage. Probably less natural sound with colder mids but surprising detail, separation and dynamics. Mid bass, as commonly the case with transformers is perhaps less incisive than it was with the opamps but acoustical bass instruments are really great. I just cannot believe something built so poorly can sound so well. Sadly, the board is really not mod-friendly and replacing the horror dc-dc convertors seems next to impossible.

audiodesign · 3rd February 2011, 06:15 PM

Try different capacitors in the center input pin to change the sound.

audiodesign · 3rd February 2011, 07:37 PM

New cheap project with EMU 0404 USB

Digital Room Correction

analog_sa · 3rd February 2011, 07:59 PM

Quote:

Originally Posted by audiodesign

Try different capacitors in the center input pin to change the sound.

Almost the first thing i tried

lwif · 7th February 2011, 08:50 AM

I found a nice photo of the complete card.
Here it is : Modding a E-MU 0404 USB | Jacken's Blog
We can see some clocks, and it should be good to try more precise clocks, even with lipo power for good i2s before the dac.
Anyone tried to remove switching regulators to put thier own good regulated power ?

Artmaster · 30th January 2013, 09:54 AM

hi all! do somebody have circuit diagramm of E-MU 0404 USB? digital output don't work of my card. Pity. I like it and would like to repair.

regiregi22 · 30th January 2013, 06:21 PM

Has it ever worked to you or never had?

30th January 2013, 09:54 AM	#69
Artmaster diyAudio Member Join Date: May 2004 Location: Kiev Blog Entries: 1	hi all! do somebody have circuit diagramm of E-MU 0404 USB? digital output don't work of my card. Pity. I like it and would like to repair. __________________ Artmaster live in www.artmaydan.org.ua

30th January 2013, 06:21 PM	#70
regiregi22 diyAudio Member Join Date: May 2009 Location: Madrid (Spain)	Has it ever worked to you or never had? __________________ diyAudio, doing it as big as you can, JUST BECAUSE WE CAN!

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5th December 2010, 11:27 PM	#61
SoNic_real_one diyAudio Member Join Date: Jan 2008 Location: Virginia	There is about the beats beween them are at 1kHz and harmonics at 2, 3, 4... But when you are listening MUSIC, the beats beween notes are SUPPOSED to be there, so it is OK to be played. I wasn't reffering to those but the "extra" ones above 20kHz range. Listen to a sine shaped 14kHz signal and then one that is square. Anyway, I am sure that LM4562 will be fine even with a 30kHz signal in the I/V or filter stages of a DAC.

12th December 2010, 06:44 PM	#62
FOXYE diyAudio Member Join Date: Feb 2009	Any idea how to bypass the internals regulator that powers the DAC and digital receiver with good psu?

14th January 2011, 09:08 AM	#63
lwif diyAudio Member Join Date: Dec 2009	Here is my recent post on the wiki for e-mu mod : " I would be very interested to see photos of the pcb in the article. It will ease understanding and help choosing this platform for mods. I am thinking of removing all regulators and replace them by good ones, that is no switching regulators. It should be even possible to put batteries for some portions (li po seems to be the buzz). Can we see the clock ? Is it possible to uprgade it with good ones ? " Anybody can post good photos of the pcb, or part of it please ? We need to see the different regulators and the clock. Thanks for your work and attention.

3rd February 2011, 04:05 PM	#64
analog_sa diyAudio Member Join Date: Aug 2002 Location: Sofia	Huge thanks to Audiodesign for suggesting those simple mods. The improvement is almost unbelievable. I used an LL1674 connected as 1+1:2 and later on added an external regulated 5v. Both had a substantial, entirely positive audible effect. The only additional and relatively easy step i can think of is raising the 5v analog supply pin of the dac chip off the board and supplying clean regulated voltage directly to it with possibly some nice local decoupling. The dac is now comparable to my 1794 dac with resitor/transformer IV stage. Probably less natural sound with colder mids but surprising detail, separation and dynamics. Mid bass, as commonly the case with transformers is perhaps less incisive than it was with the opamps but acoustical bass instruments are really great. I just cannot believe something built so poorly can sound so well. Sadly, the board is really not mod-friendly and replacing the horror dc-dc convertors seems next to impossible.

3rd February 2011, 06:15 PM	#65
audiodesign diyAudio Member Join Date: Sep 2005	Try different capacitors in the center input pin to change the sound.

3rd February 2011, 07:37 PM	#66
audiodesign diyAudio Member Join Date: Sep 2005	New cheap project with EMU 0404 USB Digital Room Correction

7th February 2011, 08:50 AM	#68
lwif diyAudio Member Join Date: Dec 2009	I found a nice photo of the complete card. Here it is : Modding a E-MU 0404 USB \| Jacken's Blog We can see some clocks, and it should be good to try more precise clocks, even with lipo power for good i2s before the dac. Anyone tried to remove switching regulators to put thier own good regulated power ?