Borbely PS has 5 uV noise and ripple - little or much? - diyAudio
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Old 13th December 2004, 07:28 PM   #1
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Default Borbely PS has 5 uV noise and ripple - little or much?

Hi all,

I am looking for a good regulated power supply (+-24 V) for a buffer. Borbely's designs seems to have a good reputation. One of his power supplies is shown below.
Is can support 200 mA so it is a bit oversized but that is to my liking :-)

The spec says it has 5 uV ripple and noise over the audio bandwidth.

Is that much or little for a regulated PS?

How does one measure such low voltages?

Click the image to open in full size.


Sigurd
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Old 14th December 2004, 07:32 AM   #2
AndrewT is offline AndrewT  Scotland
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Hi,
noise and ripple is approaching -130db.
That is good, maybe very good, some might even say excellent.
An alternative would be Jung. There is a thread here with all the construction details and it has similar performance. I would guess both have quite fast response.
regards Andrew T.
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Old 14th December 2004, 08:10 AM   #3
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5 uV is pretty good.

How do you measure it?

Noisemeter, ordinary true rms voltmeter with a preamp, sound card in PC. Many ways to do it.
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Old 14th December 2004, 08:26 AM   #4
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Default Re: Borbely PS has 5 uV noise and ripple - little or much?

Quote:
Originally posted by Sigurd Ruschkow
Hi all,

I am looking for a good regulated power supply (+-24 V) for a buffer. Borbely's designs seems to have a good reputation. One of his power supplies is shown below.
Is can support 200 mA so it is a bit oversized but that is to my liking :-)

The spec says it has 5 uV ripple and noise over the audio bandwidth.

Is that much or little for a regulated PS?

How does one measure such low voltages?


Sigurd
Hi Sigurd,
But how does it sound?
Or do you believe low noise automatically implies good sound?
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Old 14th December 2004, 09:03 AM   #5
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How does it sound?
Good question. I would like to know that, too.

Can you tell that from the schematics and the components used? Guess not,
but I think one can get atleast a hunch that it should sound OK. Good caps, good resistors, and good transistors.

Anyone knows how the PS sounds?



Sigurd
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Old 14th December 2004, 09:16 AM   #6
Cobra2 is offline Cobra2  Norway
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Quote:
Originally posted by Sigurd Ruschkow
How does it sound?
Good question. I would like to know that, too.
/------/
Anyone knows how the PS sounds?

Sigurd
Anyone knows what sugar tastes like? Sweet? how sweet?

I guess you just have to try!

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Old 17th December 2004, 08:51 AM   #7
emw is offline emw  Germany
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Default How does it sound ???

I do have a Borbely DAC , preamp, phonoamp and monoamps.
To me they do sound good with the standard components Borbely is offering. PS can be improved with Blackgate caps. But very much is depending on the trafos you want to use.
I had Pass Aleph before. Borbely to me is by far better.
Just my opinion.

Best emw
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Old 17th December 2004, 10:36 AM   #8
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emw -

the PS I am looking at is the PS (EB-202/254 ALL-FET DUAL REGULATOR for 2 x +-24 VDC) from the phono preamp.
It is a bit more powerful than the 263 and the 265:s that I were looking at in the beginning. Slightly more expensive but a good PS is very important.

The unregulated PS that will feed the EB-202/254 I think will be the EB-1198/309 dual unregulated PS. I likte that it has soft recovery diodes to rectify the AC voltage.

You mention the trafos. I plan to use separate toroidal trafos.
What trafos did you use?

Any particular capacitor that you changed into Black Gates (or maybe you changed them all)?


Regards,
Sigurd
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Old 24th December 2004, 08:20 AM   #9
emw is offline emw  Germany
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Hi Sigurd,
on my phono preamp i have a Nicd accu powersupply.
On my balanced preamp I have 4 x 100Watt Borbely Audio trafos, with the boards you mentioned, but with additional chockes.
I would not build the phono again with the accu ps. For me it is too much effort, charging and watching it does not less than 21 VDC etc... The Borbely PS Kit is as good as a battery /Accu ps.
I would go for chocked Borbely PS, but with Blackgate caps after the final regulators (if you will get BG´s ?).
On the phono board I have used BG aswell in certain areas.
Please ask Borbely when you order the parts, he will let you know.

Best ...EMW
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Old 24th December 2004, 08:20 AM   #10
emw is offline emw  Germany
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Default Phono

Hi Sigurd,
here a picture of my Borbely Audio Phono.
The caps are additional buffer between accu and phonoboard.

Best...emw
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