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Old 22nd August 2007, 12:25 AM   #11
foo is offline foo  Tibet
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As to the 0202M

My opinion is to make it a stand alone DAC by adding a digital input for it with something like wm8804/dir9001 ... etc .
Of course ,component modding is needed.
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Old 22nd August 2007, 12:36 AM   #12
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Quote:
Originally posted by imperfectcircle
What is the RMAA forum?
thanks

FYI,

http://forum.rightmark.org/topic.cgi?id=4:965
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Old 22nd August 2007, 02:02 AM   #13
Ryssen is online now Ryssen  Sweden
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Quote:
My opinion is to make it a stand alone DAC by adding a digital input for it with something like wm8804/dir9001 ... etc .
That would be interesting,unfortunately my knowledge is not good enough to do such thing from scratch.
Unless you have a solution for it..
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Old 22nd August 2007, 06:56 AM   #14
sangram is offline sangram  India
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Ryssen: There are caps on the inputs?

There are 4x470uF caps on the 5394, but those are not for input - they have some other function as mentioned in the 5394 datasheet.

I can't attach the datasheet but I have decided not to change those over, they're connected to Vref pins.
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Old 22nd August 2007, 04:43 PM   #15
Ryssen is online now Ryssen  Sweden
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AK5394

Guess your right!It sais in the data sheet the e-lyts can be up to 1000uF at the Vref,so mine is now 820uF,so no harm done....

Talking about the standalone DAC,do you mean to use it as a DAC for the computer or other Digital stuff,like CD-DVD player?
If for computer isn´t the PCI card good enough?
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Old 23rd August 2007, 09:31 AM   #16
sangram is offline sangram  India
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Umm, yeah, I don't actually plan to change those caps as I'm not going to be using the inputs at all.

foo: the lines for the DAC are available from the datasheet and a receiver can convert an incoming SPDIF to I2S, and also supply clocks. If you're after something like that then it is probably better to go gor a scratch-built design as IMO that section requires too much work. I think Zhalou (sp?) had a CS4398 version of their standalone, that would only need a few small mods...

Decoupling is the number one gripe I have with the analog section. But since there are fat ground and power planes on the board (I think it's a 4-layer board) it may not be as bad as it looks. However a few small caps across the power lines of each opamp could not hurt anybody. Plus there is a wire carrying the power from the main board to the analog section - that may add some resistance (and decoupling) from the main +/-12V supply.

The really good thing is that E-mu provided solder pads so you could actually make your own analog in and output stages and with a few small mods, only use the DAC and ADC on the board, avoiding their opamps and board layout (which IMO is a little below average too) for something a little better.
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Old 22nd March 2008, 11:47 PM   #17
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Hi Guys,

I was wondering if some1 could help me with some digital mods to the EMU 1212 card?

I would like to:
Change pulse transformer
Upgrade caps in the digital path
Adjust the output to true 75Ohm

Would anyone be able to help with a parts list or instructions to carry this out?

Cheers,
Rift.
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Old 23rd March 2008, 02:45 AM   #18
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Emu makes fantastic vfm soundcards.

A lot of audiophiles won't give them cred as they are associated with Creative Labs - known more for gaming rather than professional sound.

IMHO my Emu0404 sounds a lot better than the Benchmark DAC1 that I had.

I was looking at squeezing more performance by modding my Emu0404PCI.

However, I think I'll get the USB version then do the mods.
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Old 23rd March 2008, 07:31 AM   #19
cyp is offline cyp  China
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u had better replace coupling (LPF to I/V) caps

don't try to mod ops... i get ad8620 instead of jrc2064

sound changes worse.... i think this ops are designed for its LPF and VI

and u can use some polymer solid caps in digital decoupling....

by the way , Emu 1212m 's design is good enough ~ if u wanna promote sound quality , plz use better DAC !
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Old 14th September 2008, 07:48 AM   #20
minivan is offline minivan  Australia
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the analog and the digital card are connected by a ribbon cable byi2s interface right? has any1 tried to derive the i2s signal from the digital card and used it to feed their dac if they have i2s input. if so where are the i2s signal on the ribbon cable? thanks
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