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Old 4th March 2012, 07:28 AM   #1
quan is offline quan  Australia
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Default sony SCD5400es mod

Hi guys, i would like to change the op-amps which use as iv converter and also for low pass filter. The original Op-amps are OPA2132. What would be best op-amps for the jobs ie iv converter and low pass filter.
I know the better solutions would be no op-amps at all and instead discrete circuit. What would be a better choice changing op-amps for better specs eg LMA49720? or try ZapfilterMk2? Or Any other suggestions.
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Old 4th March 2012, 09:37 AM   #2
quan is offline quan  Australia
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Default sony xa5400es

Like usual, same problem -unable to upload picture.
The DAC is 1796 DSD with balance current outputs. There are a few possibilities but i am a novice thus needing help.
Options- op-amps-change to better parts- probably min gain
zapfilterMk2-some don't like the sound of it-active and too complex
CEN/ZEN iv solutions but how do you sum the outputs to single end RCA? or just run from + signal from each chanel only.
TPA legato?
Any recommendations guys?
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Old 4th March 2012, 07:12 PM   #3
quan is offline quan  Australia
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Also- with regarding upgrading the clock. The original crystal is going to a buffer then distributes to the other areas. Is it better to leave the original clock but disconnect to the DAC and inject the new low jitter clock to the DAC only ? or inject the new clock thru the buffer ?
Quan.
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Old 5th March 2012, 08:49 AM   #4
quan is offline quan  Australia
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Hi guys, any one reading this thread?
Would LME49720 op-amp be better than OPA2132 as iv conversion?
Quan
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Old 12th March 2012, 02:24 PM   #5
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Hi quan, maybe you can be interested in these links:
I/V + output discrete stages or transformer for DSD-1796

http://digilander.libero.it/agostino...a5400_mod.html
http://digilander.libero.it/agostino...5400_mod2.html

Ciao!
Tino
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Old 12th March 2012, 02:27 PM   #6
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Hi quan, maybe you can be interested in these links:
I/V + output discrete stages or transformer for DSD-1796

http://digilander.libero.it/agostino...a5400_mod.html
http://digilander.libero.it/agostino...5400_mod2.html

Ciao!
Tino
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Old 12th March 2012, 08:15 PM   #7
quan is offline quan  Australia
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Join Date: Feb 2007
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Hi Tino , i did read thru the info. My knowledge is limited thus i am looking for ready made unit to plug in and play. I am not afraid of wielding my soldering iron but building circuit from scratch is a bit too far for me.
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Old 13th March 2012, 09:16 AM   #8
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Hi Quan,
I can't send you the schematic of the I/V circuit designed by Mr C.

My first suggestion to you is to use the original OpAmp based I/V
conversion and replace the IC regulator stage with Sjostrom
superregulators +-12V, sjostromaudio.com - Home ,
but you will need also a board with the diode bridge and rectifying caps
(no need for another power transformer, as I did). After that big improvement,
you can replace the I/V resistor across the OpAmp with a better quality
one and the same apply to the MKP caps.

If you want a ready to go circuit, look for the products available from Pedja
Rogic http://diy.audialonline.com/modulelab/ .

If you want to build one from scratch... try the Loesch Adagio (passive I/V,
interstage transformer and tube output stage)
http://www.fortunecity.com/rivendell...io/Adagio.html

I have used the output transformer only to build a SE output from the two SE.
If you use only the SE output of the DAC (two I/V + buffer circuit), then you
don't need the output transformer (but you will not have the balanced output).

Please, be aware of to very recent update I made in my Sony: I removed all
the magnets around the wires and the Stillpoints ERS cloth: both cut the highs.
Ciao!
Tino
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Old 22nd March 2012, 10:10 AM   #9
quan is offline quan  Australia
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Default sony xa5400es

i have got C2 clock in place now, rubycon za caps around the dac and zapfilter Mk2 for analog stage. My humble opinion it is as goods as my very best vinyl rigs.
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