Reducing noise in voltage regulators

[ALW]

Buffered reference

A more recent article claimed that any sort of feedback in a voltage regulator is audibly bad. I believe their suggestion was to use a buffered reference instead.

I assume that's a buffer that has no feedback

(In which case a good RC might be better and cheaper!)

A.

 

[Jason Hubbard]

What is the best regulator for Audio

Which of the 3 terminal regulators is best LT1086 or LT317AT?

(assuming each is used in a "standard" configuration).

Or are there better alternatives?

 

[rljones]

besides commenting on Jason's question, does anyone have any comments about devices like LT1763 (+) or LT1964 (-) regulators--that have very little noise--as alternatives?

 

[ALW]

Best for Audio

Jason,

I'd go for LT0186 every time if cost not an issue, next best is LM317AT.

I haven't tried the other devices mentioned above.

Andy.

 

[borisov57]

Hi,

I found Jung schematics browsing the net. Does someone tried Sulzer regulator with AD797?
I build couple of jung/diden regulators years ago to modify my pioneer cd player and later for dac and they sound good as regulator for analog stage in cd player. I had a lot of problems implementing it(they tend to oscilate).

http://archives.e-insite.net/archives/ednmag/reg/1997/010297/01di_03.htm#fig1

good luck,

borisov57

 

[Dave]

How about one of these,

http://www.linear.com/prod/datasheet.html?datasheet=542

This is optimised for fast transient response and has 40uV Noise 10Hz to 100KHz.


or

http://www.linear.com/prod/datasheet.html?datasheet=247

20uV Noise.

 

[jan.didden]

Re: Best for Audio

Jason,

I'd go for LT0186 every time if cost not an issue, next best is LM317AT.

I haven't tried the other devices mentioned above.

Andy.

Andy (and moderators), sorry to be offtopic, but my email reply to you bounced. Kindly send your coordinates again.

Jan Didden

 

[Donvander Deijl]

I don,t understand teh problems with the normal regulars as the LM 317 and the newer low drop regulars.
If you want to have it clean take for example an lowdrop 9 v regulator and after that an 8 volt low drop regulator and i can assure you it,s quiet as well.

 

[carlmart]

Message for borisov57

Can you contact me on my e-mail?

Thanks!



Carlos

 

[ALW]

Jan

You should have received another email now. My forum profile contained an old address, now updated.

FYI, alweekes@_NOFINSPAM_.beeb.net will work, remove _nofinspam_ bit first!

A.

 

[Kevinbd]

Walt Jung Regulator

Anyone know where i can get a pcb for the walt jung regulator or one alrealy built?

It looks like the PCB layout is critical for minimising noise, so i would rather get one pre made.

Thanks

Kevin

 

[HarryHaller]

Regulator PCB

ITEM # PCBD-3A/B Didden/Jung Super Regulators
From Audio Amateur Issue 3/95. Each board contains one positive and one negative regulator. Each regulator board is 2-1/4" x 2-3/4".

http://www.audioxpress.com/bksprods/pcbs/circuitsbuild.htm

Perhaps Mr. Didden could coment on which version this is as I am not sure.

 

[jan.didden]

reducing noise etc

Harry,

I looked at the link you gave, but as far as I remember these are sets of two boards, each can be used for either a pos or a neg regulator. They include an area for a (modestly sized) heatsink and also the remote sense option. I will check my archives, but that will take until monday evening. Alternatively, one could check the article in the 3/95 AA issue.

Cheers, Jan Didden

Edit: Now it comes back! These are boards that are pre-cut, sort of. Can be used for dual supply, or physically separated as two boards. At least that's how I designed them back then.

 

[HarryHaller]

PCBD-3A/B Didden/Jung Super Regulators

Picture of stuffed board from magazine. Nice job on PCB layout, Jan.

 

[ALW]

Look what the postman brought me today

Can't wait to build some...

 

[ALW]

wanna see my bottom?

Track side

 

[jan.didden]

Reducing noise etc

Andy,

Looks pretty nice, with the start points etc. Did you already post the schematic? I would be interested to see how you translated it to the layout.

Jan Didden

 

[HarryHaller]

Can't wait to build some...

Can't wait to see a picture with stuffed parts. Go man go!

 

[ALW]

Go man go

Bit of a problem with stuffing at present, the boards arrived a week early, and I've not ordered the caps and semi's yet.

I'm onto it though...

A.

P.S. Well chuffed with results though - I used the Eagle PCB package, which is free for very small PCB's such as this. It's by far the most comprehensive, easy to use package ever, and I've used a few.

Whilst it lacks a few of the features of something like PowerPCB, for example, it's huge collection of libraries (I only had to create two parts) and general simplicity make it hard to beat. It's biggest limitation in this incarnation is board size.

 

[HarryHaller]

Bit of a problem

Well hurry up and get stuffed...........

H.H.