The simplistic Salas low voltage shunt regulator - Page 583 - 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 27th March 2013, 03:39 PM   #5821
Salas is offline Salas  Greece
diyAudio Chief Moderator
 
Salas's Avatar
 
Join Date: Oct 2002
Location: Athens-Greece
Its a juggling act since the available gate drive current reduces, so while the OLG goes up lower in freq due to more voltage drive it also starts falling earlier. That ups Zo before 100kHz and it could be associated with your preference for carbon film. All in conjunction with M2 type, Zobel, & specific active load. Also the phase margin changes so checking with oscope is essential as you mentioned. Its a tolerant topology but tweaking that far without visual test gear is not recommended to novice builders I guess.
  Reply With Quote
Old 27th March 2013, 04:03 PM   #5822
diyAudio Member
 
pietjers's Avatar
 
Join Date: Oct 2006
Quote:
Originally Posted by Salas View Post
Its a juggling act since the available gate drive current reduces, so while the OLG goes up lower in freq due to more voltage drive it also starts falling earlier. That ups Zo before 100kHz and it could be associated with your preference for carbon film. All in conjunction with M2 type, Zobel, & specific active load. Also the phase margin changes so checking with oscope is essential as you mentioned. Its a tolerant topology but tweaking that far without visual test gear is not recommended to novice builders I guess.
Salas thank you for explaining the effects of increasing R5. I am fully aware of the risks involved, but High End audio is often trail and error, and about pushing the limits. Sonically the circuit reaches a level of performance I have not heard before.

Peter
  Reply With Quote
Old 6th April 2013, 08:41 PM   #5823
diyAudio Member
 
Join Date: Jun 2006
Quote:
Originally Posted by Salas View Post
Phew, lots of drawing.
Salas
are these most up to date 1.2R
which one you recommend to power with 24 Vdc Ugs preamp
  Reply With Quote
Old 6th April 2013, 08:58 PM   #5824
Salas is offline Salas  Greece
diyAudio Chief Moderator
 
Salas's Avatar
 
Join Date: Oct 2002
Location: Athens-Greece
Those were the last, yes. Two Reflektors in floating double polarity arrangement would be easier to implement for layout, are anti ground loop, also absolutely the same for semiconductors between the two polarities. Which can be many similar types. The CFP in the 1.2R can be sensitive and give pain in the making and deployment. I will show you a 24V example ASAP.
  Reply With Quote
Old 8th April 2013, 03:31 AM   #5825
Salas is offline Salas  Greece
diyAudio Chief Moderator
 
Salas's Avatar
 
Join Date: Oct 2002
Location: Athens-Greece
Here you are. This can go to 35Vout safely also. Spot on Vo its all about using the proper R8. Or a 10K trimmer. Not best choice for ppm but handy. For finding the right value including current and VF tolerances in a build and then substituting with a good R8 at least. Keep 10V drop over the reg for the 9610 to be on its low capacitive.
Attached Images
File Type: png Reflex24.png (28.3 KB, 357 views)
  Reply With Quote
Old 8th April 2013, 10:43 AM   #5826
diyAudio Member
 
Join Date: Jun 2006
thank you very much Salas
Is this 24 V reflektor a better choice over BIB for powering UGS V3 pre

regards
  Reply With Quote
Old 8th April 2013, 02:20 PM   #5827
Salas is offline Salas  Greece
diyAudio Chief Moderator
 
Salas's Avatar
 
Join Date: Oct 2002
Location: Athens-Greece
They are both adequate. It takes you combine them with a certain preamp and you choose subjectively which one combination you may prefer.
  Reply With Quote
Old 8th April 2013, 02:32 PM   #5828
diyAudio Member
 
Join Date: Jun 2006
which one of the BIB, reflektor, 1.2r Is more Independable from wire distance between regulator out and load (25 - 45 cm) and also which one of the three Is more oscilations free than others
  Reply With Quote
Old 8th April 2013, 02:36 PM   #5829
Salas is offline Salas  Greece
diyAudio Chief Moderator
 
Salas's Avatar
 
Join Date: Oct 2002
Location: Athens-Greece
There are general precautions that should be the same but probably the Reflektor would be easier to work with and deploy. It has just one driver block doing it all by monitoring current dif.
  Reply With Quote
Old 8th April 2013, 03:10 PM   #5830
diyAudio Member
 
Join Date: Jun 2006
Salas

I see that In reflektor you have lowered zobel cap to 0.1 from 0.47
Is that a tunning mod based on listening tests - Is regulator stable that way
  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 05:24 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