Go Back   Home > Forums > >

+/- 18V Low Noise Fast Transient Supply???
+/- 18V Low Noise Fast Transient Supply???
Please consider donating to help us continue to serve you.

Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving
Reply
 
Thread Tools
Old 10th October 2020, 07:03 AM   #1
safesphere is offline safesphere  United States
diyAudio Member
 
Join Date: Oct 2014
Location: Kansas City
Default +/- 18V Low Noise Fast Transient Supply???

Hello friends,

I need your expert help and guidance to point me in the right direction. I need a super low noise and fast transient response +/- 18V power supply for my phono preamp, but I am having a hard time finding any. I would be happy to buy it or build one from a kit (or at least a circuit board), but I don't have the expertise to design it myself (not from scratch anyway). Could someone please point me to a product or project or something to start from?

Input: 120V 60Hz
Output: +/- 18V (about 0.3A)
Speed and ultra-low output impedance over a broad bandwidth (ideally 3mOhm up to 100KHz)

I would appreciate any help. Thank you!

Last edited by safesphere; 10th October 2020 at 07:12 AM.
  Reply With Quote
Old 10th October 2020, 07:15 AM   #2
jimk04 is offline jimk04  United Kingdom
diyAudio Member
 
Join Date: Jul 2018
Location: North Notts
Salas Ultra BIB for a state of the art approach.

Salas SSLV1.3 UltraBiB shunt regulator

Or if you want cheap and cheerful ready to go but with good performance...Studer 900 clone

low noise Pre-Amp / DAC power supply MJE15034 TL072 Regulator based on STUDER 900

Last edited by jimk04; 10th October 2020 at 07:18 AM.
  Reply With Quote
Old 10th October 2020, 07:23 AM   #3
Indiglo is offline Indiglo  Australia
diyAudio Member
 
Join Date: Sep 2018
There's a choice of power supplies at sjostromaudio.com. You can buy from the webshop at sjostromaudio.net
  Reply With Quote
Old 10th October 2020, 07:34 AM   #4
safesphere is offline safesphere  United States
diyAudio Member
 
Join Date: Oct 2014
Location: Kansas City
Quote:
Originally Posted by jimk04 View Post
Salas Ultra BIB for a state of the art approach.
It looks fantastic, thank you! That thread is 237 pages... Do you know if the board is available for purchase? Thanks again!
  Reply With Quote
Old 10th October 2020, 07:46 AM   #5
safesphere is offline safesphere  United States
diyAudio Member
 
Join Date: Oct 2014
Location: Kansas City
Quote:
Originally Posted by Indiglo View Post
There's a choice of power supplies at sjostromaudio.com. You can buy from the webshop at sjostromaudio.net
Look promising. Thanks for the link!
  Reply With Quote
Old 10th October 2020, 07:53 AM   #6
jimk04 is offline jimk04  United Kingdom
diyAudio Member
 
Join Date: Jul 2018
Location: North Notts
Quote:
Originally Posted by safesphere View Post
It looks fantastic, thank you! That thread is 237 pages... Do you know if the board is available for purchase? Thanks again!
If you contact member Tea Bag he is the one to ask. Be aware that there are some tricky ro source components but Teabag can supply you with those.

The Ubib is a shunt regulator. I dont know if you know what that means, I know I certainly didn't when I joined this forum! It means they require some planning and heat management is/ can be a factor to consider. Also by design they are not 'green' so depending on your personal circumstances that may also be a factor.

But having said that they are thought of very highly and are amongst one of the best psus I believe.

Edit...here is the group buy link

GB For Salas SSLV1.3 Ultra-BIB

I think if you contacted Teabag and asked nicely he will fix you up.

Last edited by jimk04; 10th October 2020 at 07:56 AM.
  Reply With Quote
Old 10th October 2020, 08:01 AM   #7
jan.didden is online now jan.didden  Europe
diyAudio Member
 
jan.didden's Avatar
 
Join Date: May 2002
Location: Westende Resort, BE coast
The lowest output impedance and fastest regulator is in the diyaudio store:

Super Regulator – diyAudio Store

Widely tested and acclaimed:

https://linearaudio.net/sites/linear...%20JW%20F8.pdf
https://linearaudio.net/sites/linear...%20JW%20F5.pdf


Jan

Last edited by jan.didden; 10th October 2020 at 08:03 AM.
  Reply With Quote
Old 10th October 2020, 09:34 AM   #8
safesphere is offline safesphere  United States
diyAudio Member
 
Join Date: Oct 2014
Location: Kansas City
Quote:
Originally Posted by jan.didden View Post
The lowest output impedance and fastest regulator is in the diyaudio store:

Super Regulator diyAudio Store

Jan
Superb. Thank you Jan! So, do I just put AD797 in place of AD825? What changes, if any, do I need to make for +/-18V instead of +/-15V? Also, the link says, "The regulator boards accept a DC input from your favorite transformer/rectifier/reservoir cap". Where can I get any help on this? Such as at least the schematics and BOM?

Thanks so much!
  Reply With Quote
Old 10th October 2020, 11:03 AM   #9
jan.didden is online now jan.didden  Europe
diyAudio Member
 
jan.didden's Avatar
 
Join Date: May 2002
Location: Westende Resort, BE coast
You should not use the 797 in this design; the 797, while superb in signal chains, has a tendency to instability in regulators.
Both Walt Jung and myself recommend the AD825 for maximum performance.

For the transformer/rectifier/reservoir capacitor, there are many designs here, and it is not critical at all. Even Google 'full wave rectifier' will show you lots of examples. To keep the two regs fully independent, with no shared grounds, it is best to use a transformer with two separate secondary windings. For +/-18VDC, secondaries of 18VAC on a 100VA transformer is fine.
Use fast, soft recovery rectifier diodes, and don't overdo the capacitor value; it has no performance advantage and might generate fast current transients that propagate into the circuit. Something like 4700uF/35V would be fine.

Jan

Last edited by jan.didden; 10th October 2020 at 11:06 AM.
  Reply With Quote
Old 10th October 2020, 11:42 AM   #10
jimk04 is offline jimk04  United Kingdom
diyAudio Member
 
Join Date: Jul 2018
Location: North Notts
If I may ask....would that be 4700uf per rail or overall?
  Reply With Quote

Reply


+/- 18V Low Noise Fast Transient Supply???Hide this!Advertise here!
Thread Tools

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
ultra low noise power supply and low noise amplifier ambrosia168 Power Supplies 8 13th October 2017 03:43 PM
Single supply vs. dual supply and noise, I can't find a proper solution Plecto Power Supplies 16 2nd August 2013 06:14 PM
Nice power supply with fast recovery diodes peranders Solid State 3 24th August 2004 04:04 PM
Super fast, low noise phono preamp dioklecijan Analogue Source 30 19th July 2004 10:52 PM


New To Site? Need Help?

All times are GMT. The time now is 10:26 AM.


Search Engine Optimisation provided by DragonByte SEO (Pro) - vBulletin Mods & Addons Copyright © 2021 DragonByte Technologies Ltd.
Resources saved on this page: MySQL 14.29%
vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2021 DragonByte Technologies Ltd.
Copyright ©1999-2021 diyAudio
Wiki