wanted: suggestion for a low noise regulator circuit.

Raj1 · 29th January 2004, 11:44 AM

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

Werner · 29th January 2004, 03:27 PM

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

Elso Kwak · 29th January 2004, 04:15 PM

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
Site is not always on line!

Raj1 · 29th January 2004, 06:39 PM

HI,

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

http://www.wenzel.com/documents/finesse.html
Thanks
Raja

Elso Kwak · 29th January 2004, 06:58 PM

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?

andrei · 29th January 2004, 09:42 PM

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...

Raj1 · 30th January 2004, 05:00 PM

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

Elso Kwak · 30th January 2004, 06:42 PM

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".

Raj1 · 30th January 2004, 06:55 PM

Hi Elso,

It's done!

Thanks
Raja

29th January 2004, 11:44 AM	#1
Raj1 diyAudio Member Join Date: Jan 2003 Location: UK	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

29th January 2004, 04:15 PM	#3
Elso Kwak Banned Join Date: Dec 2001 Location: Zamboanga, City of Flowers, Mindanao	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 Site is not always on line!

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29th January 2004, 03:27 PM	#2
Werner diyAudio Member Join Date: Jan 2002 Location: Belgium	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

29th January 2004, 06:39 PM	#4
Raj1 diyAudio Member Join Date: Jan 2003 Location: UK	HI, can this be used for a +5v supply? If so how? http://www.wenzel.com/documents/finesse.html Thanks Raja

29th January 2004, 09:42 PM	#6
andrei diyAudio Member Join Date: Dec 2002 Location: Canada	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...

30th January 2004, 06:55 PM	#9
Raj1 diyAudio Member Join Date: Jan 2003 Location: UK	Hi Elso, It's done! Thanks Raja

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