Multiple purpose dual regulated psu - diyAudio
Go Back   Home > Forums > Amplifiers > Power Supplies

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 Search this Thread
Old 21st February 2008, 08:30 PM   #1
cviller is offline cviller  Denmark
diyAudio Member
 
cviller's Avatar
 
Join Date: Dec 2005
Location: Copenhagen
Blog Entries: 2
Default Multiple purpose dual regulated psu

Hey!

I am making a regulated psu for some of my preamp projects and I would like to get a little feedback on the concept. I haven't designed the regulator myself - it is one of those that pops up multiple places on this forum with a possible origin in some old pass labs front ends.

I have attached the pcb layout and schematics with some random component values - being a generic psu, the values should be selected for the particular application. The layout also needs silk screen cleaning, but I'll do that later.

Attachment:
psu-reg.pdf
(too big for diyaudio)

Any tweeks I should make room for?


Conceptual explanation for newbies: (positive half from left)
- First some crc filtering
- Then a few mA's are taken through a jfet current source to supply the zener
- R6 and C20 is a low pass filter to reduce zener noise
- Finally Q2 and Q3 form a differential pair which regulates the voltage on Q4 to ensure that the point between R13 and R15 stays equal to the one provided by the zener.

I know the extra mosfets messes up the schem slightly, but they are there so one can switch between to220 or to247 devices. Most IRFxxx should work.

If there's any interest I might make boards available through a group buy. The board is rather large 15x10cm, because I wanted to make room for large snap in caps.
  Reply With Quote
Old 22nd February 2008, 11:45 AM   #2
AndrewT is online now AndrewT  Scotland
diyAudio Member
 
Join Date: Jul 2004
Location: Scottish Borders
Hi,
can the LTP source sufficient current to drive the FET fast enough?

Don't build the regulator to mimic the ground rail.
Properly star ground the sections and then interconnect the separate stars at the output.

Have a look at GK's thread for more info.

Make sure the measuring bridge is built as a bridge and not the way shown in the schematic.

The resistance seen at the two inputs of the LTP is different, this may lead to more drift than if the resistances were matched.

Have you read W.Jung/J.Didden?

What is the worst case dissipation in the dropper FET? A single To220 should be sufficient here.
__________________
regards Andrew T.
  Reply With Quote
Old 22nd February 2008, 12:20 PM   #3
cviller is offline cviller  Denmark
diyAudio Member
 
cviller's Avatar
 
Join Date: Dec 2005
Location: Copenhagen
Blog Entries: 2
Quote:
Originally posted by AndrewT
Hi,
1. can the LTP source sufficient current to drive the FET fast enough?

2. Don't build the regulator to mimic the ground rail.
Properly star ground the sections and then interconnect the separate stars at the output.

3. Make sure the measuring bridge is built as a bridge and not the way shown in the schematic.

4. The resistance seen at the two inputs of the LTP is different, this may lead to more drift than if the resistances were matched.

5. Have you read W.Jung/J.Didden?

6. What is the worst case dissipation in the dropper FET? A single To220 should be sufficient here.
Thanks for your comments!

1. That depends on how much current that run through, but I expect this to be well within reach - the gate C on irf9610 is not that bad.

2. Are you taking about schem og layout. The green area is gnd plane.

3. What bridge?

4. Are you talking about thermal drift?

5. No

6. That depends on the application, but in most cases I think you're right. I just have so many irfp240 and irfp9240s and I know I'm not the only one...
  Reply With Quote
Old 22nd February 2008, 01:43 PM   #4
AndrewT is online now AndrewT  Scotland
diyAudio Member
 
Join Date: Jul 2004
Location: Scottish Borders
you should read Jung's regulator articles.
__________________
regards Andrew T.
  Reply With Quote
Old 22nd February 2008, 02:52 PM   #5
cviller is offline cviller  Denmark
diyAudio Member
 
cviller's Avatar
 
Join Date: Dec 2005
Location: Copenhagen
Blog Entries: 2
Quote:
Originally posted by AndrewT
you should read Jung's regulator articles.

Why?
  Reply With Quote
Old 23rd February 2008, 02:50 PM   #6
steenoe is offline steenoe  Denmark
diyAudio Member
 
steenoe's Avatar
 
Join Date: Mar 2004
Ah, the shunt reg Ever since I build the first shuntreg a couple years back, I have been wanting to power the entire play chain with shuntregs. The single best upgrade anyone can make, is to put a shuntreg into the preamp. A more open transparent and detailed soundstage is difficult to find. When I first put one in the NS10, it was wow..., where is the speakers.....? Everything else I have build and heard sounded dull, lifeless and compressed, in comparison.
Oh, and thanks for posting, if this turns into a GB you can count me in for at least 12 boards. With the added possibillity to use a TO247 device, it might be within reach to power my class-A headphoneamp also!
This opens great oppertunities, for the shunt fans

  Reply With Quote
Old 23rd February 2008, 03:12 PM   #7
cviller is offline cviller  Denmark
diyAudio Member
 
cviller's Avatar
 
Join Date: Dec 2005
Location: Copenhagen
Blog Entries: 2
Seems like a lot of people have a strong passion for shunt regulators - perhaps I should move my efforts in that direction...
  Reply With Quote
Old 23rd February 2008, 03:14 PM   #8
Zen Mod is offline Zen Mod  Serbia
diyAudio Member
 
Zen Mod's Avatar
 
Join Date: Jan 2003
Location: ancient Batsch , behind Iron Curtain
Quote:
Originally posted by steenoe
Ah, the shunt reg Ever since I build the first shuntreg a couple years back, I have been wanting to power the entire play chain with shuntregs. The single best upgrade anyone can make, is to put a shuntreg into the preamp. A more open transparent and detailed soundstage is difficult to find. When I first put one in the NS10, it was wow..., where is the speakers.....? Everything else I have build and heard sounded dull, lifeless and compressed, in comparison.
Oh, and thanks for posting, if this turns into a GB you can count me in for at least 12 boards. With the added possibillity to use a TO247 device, it might be within reach to power my class-A headphoneamp also!
This opens great oppertunities, for the shunt fans


that reg isn't shunt , ya crazy danske .......

__________________
my Papa is smarter than your Nelson !
clean thread; Cook Book;PSM LS Cook Book;Baby DiyA ;Mighty ZM's Bloggg;Papatreasure;Papa...© by Mighty ZM
  Reply With Quote
Old 23rd February 2008, 03:17 PM   #9
steenoe is offline steenoe  Denmark
diyAudio Member
 
steenoe's Avatar
 
Join Date: Mar 2004
Darn, I could have sworn.... Those two transistors in the diagram really fooled me..
Yes, a shunt if you please. But you probably figured that by now

  Reply With Quote
Old 23rd February 2008, 04:05 PM   #10
Ryssen is offline Ryssen  Sweden
diyAudio Member
 
Ryssen's Avatar
 
Join Date: Dec 2003
Location: Sweden--> Here
Quote:
perhaps I should move my efforts in that direction...
Yes,please do.
__________________
Regards Åke
  Reply With Quote

Reply


Hide this!Advertise here!
Thread Tools Search this Thread
Search this Thread:

Advanced Search

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
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
LT Dual Tracking 3A Regulated Power Supply 1.25V to 20V okapi Power Supplies 56 9th July 2010 02:33 AM
Combining two positive regulated suppiles for obtaining a a dual one Atilla Power Supplies 9 30th July 2009 10:49 PM
Multiple subwoofer/multiple amp question boogs Subwoofers 5 13th November 2007 04:36 AM
Dual 15V Regulated Supply ble0t Parts 7 1st September 2004 01:28 AM
high-voltage regulated dual power supply zzz Solid State 1 17th September 2002 01:15 AM


New To Site? Need Help?

All times are GMT. The time now is 08:10 AM.


vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2014 DragonByte Technologies Ltd.
Copyright ©1999-2014 diyAudio

Content Relevant URLs by vBSEO 3.3.2