The simplistic Salas low voltage shunt regulator - Page 61 - 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 20th June 2009, 05:36 AM   #601
Salas is offline Salas  Greece
diyAudio Chief Moderator
 
Salas's Avatar
 
Join Date: Oct 2002
Location: Athens-Greece
Quote:
Originally posted by Marinos
I use teflon for years now. Very easy to work with. I use those standard brown predrilled boards that you use to make the layout. I mark the holes with a pencil, attach the teflon sheet underneath and drill. The photo shows a guide for 4 shunts board
Nice way to do it. P2P & Teflon, purest way I guess. I have seen it on your high voltage supply too. Thanks.
Attached Images
File Type: jpg img_2594-small.jpg (84.7 KB, 1174 views)
  Reply With Quote
Old 20th June 2009, 05:39 AM   #602
iko is offline iko  Canada
diyAudio Moderator
 
iko's Avatar
 
Join Date: May 2008
Location: Toronto
Nicely done Marinos, thanks! Are teflon boards easy to find where you are?
  Reply With Quote
Old 20th June 2009, 05:50 AM   #603
Salas is offline Salas  Greece
diyAudio Chief Moderator
 
Salas's Avatar
 
Join Date: Oct 2002
Location: Athens-Greece
Iko, why Marinos reports such a big difference for the better subjectively when shunt powering OPA627s, which are high PSRR circuits? He already had batteries for years. I see he has long enough cabling from the shunts to the circuit. Yet his sound boomed. Is it beyond psrr and output impedance? My guess is that the simple shunts put minimal components between audio and power, and have only local loops. Must be a major factor for the tone.
  Reply With Quote
Old 20th June 2009, 05:51 AM   #604
Marinos is offline Marinos  Greece
diyAudio Member
 
Marinos's Avatar
 
Join Date: Mar 2003
Location: Athens
Quote:
Are teflon boards easy to find where you are?
There is hardware store at Athens center that I always find it and it is cheap. I suppose that it is not widely available..
__________________
Marinos
  Reply With Quote
Old 20th June 2009, 05:52 AM   #605
Salas is offline Salas  Greece
diyAudio Chief Moderator
 
Salas's Avatar
 
Join Date: Oct 2002
Location: Athens-Greece
Which is that store?
  Reply With Quote
Old 20th June 2009, 06:05 AM   #606
Marinos is offline Marinos  Greece
diyAudio Member
 
Marinos's Avatar
 
Join Date: Mar 2003
Location: Athens
Repas. (PM for details if you don't know it)
__________________
Marinos
  Reply With Quote
Old 20th June 2009, 07:39 AM   #607
massimo is offline massimo  Italy
diyAudio Member
 
Join Date: Dec 2002
Location: Milan, Italy
I must come back to Athens not only to visit the new museum then...

P.S. Elgin marbles must come back to Greece!
  Reply With Quote
Old 20th June 2009, 09:50 AM   #608
AndrewT is offline AndrewT  Scotland
diyAudio Member
 
Join Date: Jul 2004
Location: Scottish Borders
Quote:
Originally posted by ikoflexer
it happened usually very fast. I'd hear a pop and done
which one popped?
M1, M2 or M4?
__________________
regards Andrew T.
  Reply With Quote
Old 20th June 2009, 02:17 PM   #609
iko is offline iko  Canada
diyAudio Moderator
 
iko's Avatar
 
Join Date: May 2008
Location: Toronto
Quote:
Originally posted by Salas
Iko, why Marinos reports such a big difference for the better subjectively when shunt powering OPA627s, which are high PSRR circuits? He already had batteries for years. I see he has long enough cabling from the shunts to the circuit. Yet his sound boomed. Is it beyond psrr and output impedance? My guess is that the simple shunts put minimal components between audio and power, and have only local loops. Must be a major factor for the tone.
Interesting. I've recently come across a rave review by Lynn Olson on the LNPA-150 amp. Apparently the amp was all solid state, no boutique parts, no extraordinary topology, yet it sounded extraordinary. The amp had a discrete regulator. He theorizes in some other places about the regulator somehow isolating the amp from the bank of capacitors which he thinks is in part responsible for the bad sound of most SS amps.

My experience with batteries was "sluggish" sound and as soon as I used your regulator the dynamic acquired was great. There is something to be said about a low noise circuit, and that gives current fast and when it's needed, in the same time keeping the voltage more constant.

These are some of the reasons why I'd like to get my tube (power) headphone amp regulated asap.
  Reply With Quote
Old 20th June 2009, 02:28 PM   #610
iko is offline iko  Canada
diyAudio Moderator
 
iko's Avatar
 
Join Date: May 2008
Location: Toronto
Quote:
Originally posted by AndrewT
which one popped?
M1, M2 or M4?
Andrew, it was this schematic that I was using at the time.

Click the image to open in full size.

But instead of the irf840 I used irfpc60 and some other n-channel high voltage high power mosfets. It was the shunt mosfet (irfpc60) that usually got burned. Now I recall that it would often oscillate as well. It was probably just badly built by me.
  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 02:55 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