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Old 30th June 2004, 07:19 AM   #11
lucpes is offline lucpes  Europe
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OPA2134 (@vitacom in Romania) is a better replacement for the opamps than the OPA2604 as the PS for the TL072s is most likely +-12. Also shunt output coupling caps (crap electrolytics) if you go this way, but only if you get less than 10mV of DC offset on outputs.

5th element: Some older Live! models had ~5V pp on SPDIF instead of the standard value, so make sure you don't fry the receiver chip on the DAC.
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Old 30th June 2004, 09:39 AM   #12
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Quote:
Originally posted by lucpes
OPA2134 (@vitacom in Romania) is a better replacement for the opamps than the OPA2604...
Yes, I also prefer the OPA2132 (same thing but more expensive...) to the OPA2604.
But at the time I only had OPA2604s in SMD and I used those.
Not easy to change, as you can imagine.

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Originally posted by lucpes
...as the PS for the TL072s is most likely +-12.
If I remember (this must have been some 3 or 4 years ago), it's much worse than that.
From the +/- 12v it regulates to +/-5v on the SB, and it's this voltage that is present on the op-amps' pins.
The OPA2604s didn't like this at all (they work much better at higher voltages), and this was one of the reasons I made the PSU.
But before making the PSU I tested to feed the op-amps with +/-12v from the PC's PSU.
Miserable.
I heard the heads of the HDD moving back and forth on my speakers.
Interference everywhere.

Inside a PC is the worst place to have a soundcard.
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Old 30th June 2004, 10:03 AM   #13
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Quote:
Originally posted by carlosfm


But at the time I only had OPA2604s in SMD and I used those.
Not easy to change, as you can imagine.

Inside a PC is the worst place to have a soundcard.
Agreed Anyway, to change SMD IC's take it leg by leg: for desoldering just heat & gently lift one foot at a time using a needle/pin.
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Old 30th June 2004, 10:12 AM   #14
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Agreed Anyway, to change SMD IC's take it leg by leg: for desoldering just heat & gently lift one foot at a time using a needle/pin.
Yes, that's what I do.
But I don't feel the need to tweak this soundcard anymore, it's fine for me.
If I was to bother and loose some more time with this, the next step would be getting I2S from the original dac's pins to the outside of the PC and make an external dac.
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Old 30th June 2004, 11:35 AM   #15
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Quote:
Originally posted by lucpes

5th element: Some older Live! models had ~5V pp on SPDIF instead of the standard value, so make sure you don't fry the receiver chip on the DAC.

are you sure this has been fixed on the newer models?
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Old 30th June 2004, 11:37 AM   #16
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are you sure this has been fixed on the newer models?
At least my old SB Live Value works fine with my Audio Alchemy DDE v3.0...
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Old 30th June 2004, 12:09 PM   #17
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I don't know what reciever it uses, but from what I've read here the CS8412 is more than happy with something higher that 0.5v pp
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Old 30th June 2004, 12:38 PM   #18
lucpes is offline lucpes  Europe
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Regarding the 5V issue, here's some more details (the signal on the Live! seems to be TTL)http://www.andrewkilpatrick.org/mind/spdif/

I don't know more about it, I don't have a Live! around anymore.
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Old 30th June 2004, 01:54 PM   #19
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On the 3 1/2" digital out plug at the back, it is SPDIF.
Internaly, on the board, you have the pins where the drive bay connects, with a flat cable, and you can get digital out from there, but those are TTL.
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Old 30th June 2004, 07:08 PM   #20
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Well the DIR1703 can handle 6.5v pp so I guess im OK.
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