Negative and positive regulated supply:same winding? - diyAudio
Go Back   Home > Forums > Amplifiers > Power Supplies
Home Forums Rules Articles diyAudio Store Gallery Wiki Blogs Register Donations FAQ Calendar Search Today's Posts Mark Forums Read

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
Thread Tools Search this Thread
Old 4th July 2012, 12:07 AM   #1
diyAudio Member
bullpeters's Avatar
Join Date: Apr 2009
Location: in the land of OZ. right next to beach
Default Negative and positive regulated supply:same winding?

I have a 50 volt winding and need two adjustable neg 12.2vdc supplies and one regulated 6.3 vdc heater supply.
Can i be done and can you point me to where i can figure out how to do it
  Reply With Quote
Old 4th July 2012, 01:24 AM   #2
Minion is offline Minion  Canada
diyAudio Member
Join Date: May 2006
Location: Cowican Bay , vancouver island
A 50v Ac Supply will give you about 70v DC which is very problematic to regulate down to -12v or +6v , not even worth considering especially when you can get a 12v ac transformer or wallmart for next to nothing which would do the job .....

It"s also somewhat problematic to try to get both +/-DC from a single transformer winding , You could use a voltage doubler to get +/-DC from a single winding but you will be dealing with double the ripple in the PSU and would need to double up on the PSU Capacitance , not ideal for high current applications like heaters ......
  Reply With Quote
Old 4th July 2012, 02:42 AM   #3
diyAudio Member
bullpeters's Avatar
Join Date: Apr 2009
Location: in the land of OZ. right next to beach
Thanks. I think I figured it out anyway. I have a centre tapped 30v transformer with a full bridge rectifier should give me ground positive and negative supplies (somehow) then two negative regulators for the Bias supply and run the heaters at 12.6 positive in series? (or parralell, i cant remember which) that should work, right?
  Reply With Quote
Old 4th July 2012, 05:59 AM   #4
diyAudio Member
Triodethom's Avatar
Join Date: Dec 2009
Location: Newnan GA
if it 30 volt ct then you get about 21 volt each way that easy to reg down to 12.6 + and - . for the heaters if you go a little low say 3 to 4 % it lessen the distortion a littlle . Don.t go more than 5 % low because it shortens tube life.
  Reply With Quote


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
Power supply positive-negative-ground from a single power supply mome Power Supplies 8 9th September 2011 05:17 PM
Positive/Negative Feedback cbj591 Tubes / Valves 9 12th July 2010 07:49 AM
Positive regulator to produce negative voltage? stef1777 Parts 45 8th February 2008 07:46 AM
Tends TA10 negative or positive grounded emperor Class D 10 19th April 2007 12:39 PM
Positive regulators for negative supplies? JohnG Solid State 7 4th February 2003 12:28 PM

New To Site? Need Help?

All times are GMT. The time now is 07:10 AM.

vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2017 DragonByte Technologies Ltd.
Copyright 1999-2017 diyAudio

Content Relevant URLs by vBSEO 3.3.2