wanted: suggestion for a low noise regulator circuit. - diyAudio
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Old 29th January 2004, 12:44 PM   #1
Raj1 is offline Raj1  United Kingdom
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Default wanted: suggestion for a low noise regulator circuit.

Hi,

I'm after a low noise regulator circuit which I can build at home. I want a circuit that is small and can be fitted inside my dac easily, taking up a minimal amount of space. There are 2 dacs each requiring there own +5v supply and also a pre 12v regulator.. At present 7805's are used, but I'd like a supply which offers lower noise than usual 317's etc. I know there are pcb's available for various designs but have shunned them on grounds of cost, considering I'm after 3!

Thanks
Raja
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Old 29th January 2004, 04:27 PM   #2
Werner is offline Werner  Europe
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I'm writing a series for TNT covering just that. Drop me an email at werner @ tnt-audio.com and I'll forward you the first installment which deals with measured noise in five types of regulators.

http://www.tnt-audio.com/clinica/reg..._noise1_e.html


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Old 29th January 2004, 05:15 PM   #3
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Lightbulb low noise regulator

Hi, How about this site?
I also features the Wenzel Finesse circuit used by a local clock monger.
http://www3.sympatico.ca/add.automat...ice/ripple.htm
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Old 29th January 2004, 07:39 PM   #4
Raj1 is offline Raj1  United Kingdom
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HI,

can this be used for a +5v supply? If so how?

http://www.wenzel.com/documents/finesse.html
Thanks
Raja
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Old 29th January 2004, 07:58 PM   #5
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Default Why not?

Quote:
Originally posted by Raj1
HI,

can this be used for a +5v supply? If so how?

http://www.wenzel.com/documents/finesse.html
Thanks
Raja
Why not?

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Old 29th January 2004, 10:42 PM   #6
andrei is offline andrei  Canada
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I have used buffered and filtered low-noise voltage reference as a supply for analog stages of my latest DAC. Nice thing about this implementation is that the power feed point is out of the feedback loop at audio frequencies - the supply looks like a passive RC source to the load. The opamp buffer is configured as a shunt regulator in my circuit, although series regulator is more common.

Burr-Brown has instructive application notes about this in their voltage reference section...
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Old 30th January 2004, 06:00 PM   #7
Raj1 is offline Raj1  United Kingdom
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Question Re: Why not?

Quote:
Originally posted by Elso Kwak

Why not?


Hi Elso,

What I meant is that do any component values need to be changed for the lower power supply of 5v as compared to 15v?

Also should I bot be able to get the parts (transistors) in the UK can someone recommend plug in alternatives?

Thanks
Raja
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Old 30th January 2004, 07:42 PM   #8
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Question Re: Re: Why not?

Quote:
Originally posted by Raj1



Hi Elso,

What I meant is that do any component values need to be changed for the lower power supply of 5v as compared to 15v?

Also should I bot be able to get the parts (transistors) in the UK can someone recommend plug in alternatives?

Thanks
Raja
Hi Raja, Plaese enable your "email button".
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Old 30th January 2004, 07:55 PM   #9
Raj1 is offline Raj1  United Kingdom
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Hi Elso,

It's done!

Thanks
Raja
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