Go Back   Home > Forums > >
Home Forums Rules Articles diyAudio Store Blogs Gallery Wiki Register Donations FAQ Calendar Search Today's Posts Mark Forums Read

The simplistic Salas low voltage shunt regulator
The simplistic Salas low voltage shunt regulator
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 4th October 2009, 05:05 AM   #1191
iko is offline iko  Canada
diyAudio Moderator
 
iko's Avatar
 
Join Date: May 2008
Location: Toronto
The simplistic Salas low voltage shunt regulator
Sorry to hear about your headache.

The zener can be a 1N4744A. I would not remove that cap. V1 has been extensively tested and tweaked by people with good ears, and the consensus is that the cap is needed. My noise measurements confirm this. But best is to make your own mind.

About the choice of caps, salas and nicoch46 can say much more. The thread in which salas has first made the regulator available is this
http://www.diyaudio.com/forums/showt...29126&page=242

There are many comments there about tweaks, but it's also a long thread.

About heat sinks. The inherent workings of the shunt are such that the more current the load draws, the less current will go through the shunt mosfet (the mosfet that passes current to ground). The CCS mosfet, the one after R1, passes a steady total current all the time. The IRFP9240 and IRFP240 are TO-247 devices, they can dissipate quite a lot of heat if properly heat sink-ed.

Have a look at these two.

Click the image to open in full size.

Click the image to open in full size.

Edit: this is V1

Last edited by iko; 4th October 2009 at 05:23 AM. Reason: Made clear this is V1
  Reply With Quote
Old 4th October 2009, 05:09 AM   #1192
ncc is offline ncc
diyAudio Member
 
Join Date: Jul 2006
Location: VN
Send a message via Yahoo to ncc
Hi Salas, Ikoflexer and everyone,

I need a schematic of Salas V1 for my DAC which require +15V at 68ma and -15V at 43ma.
I have a two dual 15V transformer already.
I would be gratefull if you have any equivalent schematics for me.
I have a question for the voltage reference, for example because I need 15V output if I place a 9V zener in serie with three 1.8V led would this be OK?

Thank you
ncc
  Reply With Quote
Old 4th October 2009, 05:22 AM   #1193
iko is offline iko  Canada
diyAudio Moderator
 
iko's Avatar
 
Join Date: May 2008
Location: Toronto
The simplistic Salas low voltage shunt regulator
Yes, LEDs in series with the zener shouldn't be a problem. For schematic, see my post before yours (post 1191). That is V1.
  Reply With Quote
Old 4th October 2009, 09:37 AM   #1194
Salas is offline Salas  Greece
diyAudio Chief Moderator
 
Salas's Avatar
 
Join Date: Oct 2002
Location: Athens-Greece
The simplistic Salas low voltage shunt regulator
Quote:
Originally Posted by ncc View Post
Hi Salas, Ikoflexer and everyone,

I need a schematic of Salas V1 for my DAC which require +15V at 68ma and -15V at 43ma.
I have a two dual 15V transformer already.
I would be gratefull if you have any equivalent schematics for me.
I have a question for the voltage reference, for example because I need 15V output if I place a 9V zener in serie with three 1.8V led would this be OK?

Thank you
ncc
Don't use a 9V zener, its one of the bad noise zener region. Use 7 - 8 red leds instead. Match them and see how near 15V they get you. Polarity of leds is the same as the 3 leds go in above schematics in each positive and negative shunt. R1=15R 2W is enough current for your application, +/- 150mA CCS. 6R8 runs it above 200mA with most leds. Not necessary.
  Reply With Quote
Old 4th October 2009, 01:23 PM   #1195
quanghao is offline quanghao  Viet Nam
diyAudio Member
 
Join Date: Sep 2009
Location: Vietnam
The simplistic Salas low voltage shunt regulator Send a message via Yahoo to quanghao The simplistic Salas low voltage shunt regulator
Thank Salas and Ikoflexer !!!
to day I finish the Salas shunt for my DAC!
I think It is very good, and wonderfull, I draw again cricuit, anh I make some
board!
I use tow LEDS and Trim change to zener! That is better!
thank you again!
QuangHao
Attached Images
File Type: jpg Sala-shunt-for-DAC.jpg (497.8 KB, 1660 views)
  Reply With Quote
Old 4th October 2009, 02:58 PM   #1196
iko is offline iko  Canada
diyAudio Moderator
 
iko's Avatar
 
Join Date: May 2008
Location: Toronto
The simplistic Salas low voltage shunt regulator
I forgot to mention, everyone. For the easy entry to V1, have a look at this:
http://www.diyaudio.com/forums/pass-labs/145201-building-symmetrical-psu-b1-buffer-post1941578.html

There's a group buy for a nice board which includes dual rail regulator, direct coupled B1 buffer, and soft start. But some people get the boards only for the regulator (easy to change voltage out, current, etc.).

Disclaimer: I have nothing to do with the GB, just mentioned it in case it may be helpful.

GB

http://www.diyaudio.com/forums/showt...00#post1941600

salas, you weren't around earlier so I took the liberty to post a dual rail schematic of V1. Let me know if I should change anything.
  Reply With Quote
Old 4th October 2009, 03:02 PM   #1197
Salas is offline Salas  Greece
diyAudio Chief Moderator
 
Salas's Avatar
 
Join Date: Oct 2002
Location: Athens-Greece
The simplistic Salas low voltage shunt regulator
Quote:
Originally Posted by quanghao View Post
Thank Salas and Ikoflexer !!!
to day I finish the Salas shunt for my DAC!
I think It is very good, and wonderfull, I draw again cricuit, anh I make some
board!
I use tow LEDS and Trim change to zener! That is better!
thank you again!
QuangHao
Great draw quality schematic. Thanks. Seems I got a new nickname in the Far East.

All the guys who want a DAC 5V version may refer to this. Endorsed for visual clarity and optimum Vref. The 100R in series with two leds is a trimmer.
The resistor in the CCS IRFP9240 is the 470R.
  Reply With Quote
Old 4th October 2009, 03:02 PM   #1198
iko is offline iko  Canada
diyAudio Moderator
 
iko's Avatar
 
Join Date: May 2008
Location: Toronto
The simplistic Salas low voltage shunt regulator
I forgot to mention, everyone. For the easy entry to V1, have a look at this:
http://www.diyaudio.com/forums/pass-labs/145201-building-symmetrical-psu-b1-buffer-post1941578.html

There's a group buy for a nice board which includes dual rail regulator, direct coupled B1 buffer, and soft start. But some people get the boards only for the regulator (easy to change voltage out, current, etc.).

Disclaimer: I have nothing to do with the GB, just mentioned it in case it may be helpful.

GB

http://www.diyaudio.com/forums/showt...00#post1941600

salas, you weren't around earlier so I took the liberty to post a dual rail schematic of V1. Let me know if I should change anything.
  Reply With Quote
Old 4th October 2009, 03:08 PM   #1199
Salas is offline Salas  Greece
diyAudio Chief Moderator
 
Salas's Avatar
 
Join Date: Oct 2002
Location: Athens-Greece
The simplistic Salas low voltage shunt regulator
I have seen it before I went voting. Its OK.

I may remind that the DCB1S shunt's part is tuned to it, and I would prefer jameshill pcb liberty. I run the positive Vref harder on that GB's shunt part for special reasons.

Thanks Iko for keeping the thread informative.
  Reply With Quote
Old 4th October 2009, 03:20 PM   #1200
iko is offline iko  Canada
diyAudio Moderator
 
iko's Avatar
 
Join Date: May 2008
Location: Toronto
The simplistic Salas low voltage shunt regulator
Cool. Yes, James did a very nice job on the layout. Here's the link to his work:

http://www.diyaudio.com/forums/showp...&postcount=226

At some point it'd be nice to start a wiki with all the different layouts, etc.

Voting eh? It seems your taxes will go up the left is winning?
  Reply With Quote

Reply


The simplistic Salas low voltage shunt regulatorHide 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

Forum Jump


New To Site? Need Help?

All times are GMT. The time now is 05:07 PM.


Search Engine Optimisation provided by DragonByte SEO (Pro) - vBulletin Mods & Addons Copyright © 2018 DragonByte Technologies Ltd.
Resources saved on this page: MySQL 15.79%
vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2018 DragonByte Technologies Ltd.
Copyright ©1999-2018 diyAudio
Wiki