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Old 30th May 2007, 01:50 PM   #1
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Default Sony XA2-ES Tweak.

Hi!

I'm looking for some tweaks about Sony cd player XA2-ES.

Could you help me?

Best Regards.
Enzo.
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Old 31st May 2007, 07:06 PM   #2
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1. Better transformer (torodial)
2. Better power supply capacitors e.g. Panasonic FC series
3. Faster diodes in the power supply e.g. IRF HFA08TB60
4. Better Opamps; depends on, what ops are used in this CD-player.
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Old 4th June 2007, 12:57 PM   #3
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Hi!

The opamp used in my Cd player are NE5532P.
Some people advice me to change them with Burr Brown OPA2132.

What do you think about?

Best regards
Enzo.
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Old 4th June 2007, 01:13 PM   #4
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In my opinion, you should use an adaptor 2xSMD -> DIP8.
Very good audio ops are:
1. BB OPA627
2. AD825

In this case, a OPA2132 may be not the right choice, since it is an JFET input OP. The source impedance has to be <=2kOhm.

And have a closer look at the power regulation.
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Old 4th June 2007, 08:46 PM   #5
ctong is offline ctong  United States
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Quote:
Originally posted by Keruskerfuerst
In my opinion, you should use an adaptor 2xSMD -> DIP8.
Very good audio ops are:
1. BB OPA627
2. AD825

In this case, a OPA2132 may be not the right choice, since it is an JFET input OP. The source impedance has to be <=2kOhm.

And have a closer look at the power regulation.
JFETs have high input impedence, therefore can tolerate higher source impedence than bipolar transistors.
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Old 5th June 2007, 02:48 AM   #6
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But a FET has a non-constant input capacity.
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Old 5th June 2007, 01:43 PM   #7
ctong is offline ctong  United States
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Quote:
Originally posted by Keruskerfuerst
But a FET has a non-constant input capacity.
The input capacitance of a typical JFET opams is only a few pf. Therefore, any nonlinear modulation is not likely to result in significant distortion in audio applications. This issue will be important for power FET (e.g., IRF240), which indeed needs a low-impedance source.
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Old 5th June 2007, 06:23 PM   #8
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The distortion will increase by the factor of 5, if the source impedance is greater than 2kOhm.

You can measure and hear this.
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Old 5th June 2007, 07:35 PM   #9
ctong is offline ctong  United States
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Quote:
Originally posted by Keruskerfuerst
The distortion will increase by the factor of 5, if the source impedance is greater than 2kOhm.

You can measure and hear this.

There are many ways to use opamps incorrectly. I do not know what circuit you use around opamps so I cannot comment on your measurements. However, in general, when the input impedance for both the noninverting and inverting inputs are matched, the nonlinear modulation due to the JFET input capacitance becomes a common-mode signal and is rejected.
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