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Old 22nd June 2012, 01:36 PM   #1491
AndrewT is offline AndrewT  Scotland
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I am inclined to say neither. Just ensure the PSU behaves properly.
However the "golden eared Members" say otherwise.
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Old 22nd June 2012, 02:32 PM   #1492
RCruz is offline RCruz  Switzerland
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SSLV1.1 builds & fairy tales
Hehe... that depends on what you are powering with the shunt
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Old 22nd June 2012, 02:47 PM   #1493
merlin el mago is offline merlin el mago
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Hehe... that depends on what you are powering with the shunt
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Old 22nd June 2012, 04:53 PM   #1494
samoloko is offline samoloko  Bulgaria
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Hehe... that depends on what you are powering with the shunt
1) digital chips analog and digital 5V

2) DAC analog output stage

3) preamplifier
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Old 22nd June 2012, 05:26 PM   #1495
barrows is offline barrows
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Default sam:

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Originally Posted by samoloko View Post
1) digital chips analog and digital 5V

2) DAC analog output stage

3) preamplifier

I think we need to agree that numbers 2 and 3 above are the same as far as power supply requirements-there are essentially no differences in the needs of a DAC analog stage and a preamp analog stage.
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Old 23rd June 2012, 12:22 AM   #1496
alazira is offline alazira  United States
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Default Vref vs Vout influence

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Originally Posted by samoloko View Post
which one of the Vref and Vout caps gives more influence
I find the Vref caps make more of a difference. My
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Old 23rd June 2012, 11:32 AM   #1497
merlin el mago is offline merlin el mago
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I find the Vref caps make more of a difference. My
You aren't alone: welcome to the "Golden Ears Club"

Also is very important low ppm Vref resistance avoiding the trimmer to ensure no drift & no change of resistance due to the hot temperature of the regulator.
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Old 23rd June 2012, 11:35 AM   #1498
AndrewT is offline AndrewT  Scotland
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........... very important low ppm Vref resistance avoiding the trimmer to ensure no drift & no change of resistance due to the hot temperature of the regulator.
have you compared the difference that a 5ppm vs a 50ppm resistor would make to the "change" in output voltage.
Have you compared these "resistor" tempcos to the semiconductor tempcos?

Balderdash !!
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Old 23rd June 2012, 11:54 AM   #1499
merlin el mago is offline merlin el mago
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I compared a trimmer vs a low ppm Vref resistor.

How do you say "Balderdash !!"
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Old 23rd June 2012, 12:10 PM   #1500
AndrewT is offline AndrewT  Scotland
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let's suppose the resistor sees a dynamic temperature change of 20C degrees due to varying signal.
The 5ppm resistor will have a dynamic change in resistance of 100ppm, the 50ppm resistor will have a dynamic change in resistance of 1000ppm or 0.1%

That change will result in possibly as much as 0.01% change in the output voltage if no other measures were in place to lower the impedance.

But compare the change in semiconductor parameters. They completely swamp these tiny resistor value changes.

If you now look at the ambient temperature changes in the PSU, you will find that the resistor change in resistance cannot be measured as a change in output voltage. It holds at it's new value. That new value might be 0.5% higher than when cold, or could be 0.005% higher than when cold. But you cannot measure that drift change because it is completely swamped by all the other changes in voltage. You cannot hear the drift change in resistor resistance for exactly the same reasons. 5ppm or 50ppm does not affect the sound at an amplifier fed with the regulator.
We hear AC we cannot hear DC.
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