The simplistic Salas low voltage shunt regulator - Page 45 - 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 11th June 2009, 05:19 PM   #441
Salas is online now Salas  Greece
diyAudio Chief Moderator
 
Salas's Avatar
 
Join Date: Oct 2002
Location: Athens-Greece
You describe it subjectively as I have experienced it too. And I too like the Leds better in some applications. For high current I like the Vbe version. A very small difference in the highs is where it focuses in my experience.

I use glass encapsulated 1W 1NxxxxA series. I can't see any brand name on them. My best resolution indirect way of knowing is running FFT for the powered audio circuit and watching the noise floor. Those compensated Zeners have fantastic characteristics, but could not lay my hands on any.
A sure alternative way to stay low is a Leds string for Vref. Especially if making a shunt for the 5-10V region where Zeners are problematic and Leds needed still few. Its like a Christmas tree, better boxed in.
  Reply With Quote
Old 11th June 2009, 07:36 PM   #442
diyAudio Member
 
nicoch58's Avatar
 
Join Date: Oct 2004
my face when I look the shunt ,need sunglass
__________________
Sic58
  Reply With Quote
Old 11th June 2009, 07:41 PM   #443
diyAudio Member
 
nicoch58's Avatar
 
Join Date: Oct 2004
Default ot

ideal bias point for output device is Peak beta ? for 2sk1058?

if 1A, bias=1A
with 3 pair 2sk1058/compl. ?
__________________
Sic58
  Reply With Quote
Old 11th June 2009, 08:00 PM   #444
jam is offline jam  United States
diyAudio Member
 
jam's Avatar
 
Join Date: May 2001
Location: Auburn, CA, USA
Default Did someone say Christmas Tree

Salas,

This could the new Salas LED Current Source ...........
Attached Images
File Type: jpg mk100.jpg (39.6 KB, 716 views)
  Reply With Quote
Old 11th June 2009, 08:02 PM   #445
Salas is online now Salas  Greece
diyAudio Chief Moderator
 
Salas's Avatar
 
Join Date: Oct 2002
Location: Athens-Greece
I think that ideal is a combination of power to load, psu stiffness, and distortion measurements. In your amp I would practically up the current until my sinks went up to 55c and listen if I get better sound. If not I would go back.
  Reply With Quote
Old 11th June 2009, 08:05 PM   #446
iko is offline iko  Canada
diyAudio Moderator
 
iko's Avatar
 
Join Date: May 2008
Location: Toronto
Just an update. I've been working on the prototype and have it working. Not exactly as presented last, made a few changes, but nevertheless working in the real world. Tested it with an AC sine load of about 30mA RMS, on top of a DC load of 80mA. The prototype uses two 11V zeners so the output voltage is about 22.4V. With that load the output voltage had a visible ripple of 200uV. The shunt mosfet was set to about 100mA idle current, which might have been excessive for that load, but whatever. Stable, lower output impedance and wider bandwidth (in simulation). In the real world a proper comparison should be done if anyone cares. The truth is that the promised better performance might not be realizable because of the vagaries of real world circuits with parasitics and blas all over the place. However, maybe with proper layout and top notch components it is possible. At least in theory it is. I will post the actual schematic that is now built a little later. Please don't ask about the sonic merits or lack thereof, because that's not one of my strong points. And sorry for flooding you all so often with so many versions, hopefully I can move on now.
  Reply With Quote
Old 11th June 2009, 08:07 PM   #447
Salas is online now Salas  Greece
diyAudio Chief Moderator
 
Salas's Avatar
 
Join Date: Oct 2002
Location: Athens-Greece
Default Re: Did someone say Christmas Tree

Quote:
Originally posted by jam
Salas,

This could the new Salas LED Current Source ...........
Imagine the Vref made out of LEDs for the 45V nicoch version of double symmetric (4 pieces on two perfboards). You can listen at night and see around without burning the house lights. Eco friendly.
  Reply With Quote
Old 11th June 2009, 08:09 PM   #448
Salas is online now Salas  Greece
diyAudio Chief Moderator
 
Salas's Avatar
 
Join Date: Oct 2002
Location: Athens-Greece
Iko:

Me I like your versions and learn. Keep up the good work. We like photos always!
  Reply With Quote
Old 11th June 2009, 08:09 PM   #449
jam is offline jam  United States
diyAudio Member
 
jam's Avatar
 
Join Date: May 2001
Location: Auburn, CA, USA
Iko,

Do two 11v zeners in series perform better than say a 22v zener. I have not tried the former.

Jam
  Reply With Quote
Old 11th June 2009, 08:13 PM   #450
mikelm is offline mikelm  England
diyAudio Member
 
Join Date: May 2003
Location: England
Send a message via Yahoo to mikelm
SOME CLARIFICATION

1) I am not using CFP in my regulators.

2) Jam - I hear your words but did u hear mine ? some people also prefer the SOUND of CFP's - did u ever try them ?

3) I have used them in an amplifier feedback loop without any problems and I enjoyed the sound of that amp very much.


I'm not saying they're the best but I do not think they are inherently evil.
  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



New To Site? Need Help?

All times are GMT. The time now is 12:03 PM.


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