Linear power... - 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 3rd June 2005, 10:52 PM   #1
Htguy is offline Htguy  United States
diyAudio Member
 
Join Date: Aug 2003
Location: Tucson AZ
Default Linear power...

Hi,

I am looking to build a linear power supply for a project of mine and I need a +5, -5, +15 and -15 supply. It was suggested that I use LM338t's for each but the 338t does not list it for use as a - regulator. (I am some what green at this) Anyhow am I missing something? Is there a way I can make the - supplies with the 338t?

Thanks

God bless....

Mark
  Reply With Quote
Old 4th June 2005, 01:28 AM   #2
SY is offline SY  United States
diyAudio Moderator
 
SY's Avatar
 
Join Date: Oct 2002
Location: Chicagoland
Blog Entries: 1
I'll move this over to the Power Supply area where you'll probably get better response.
__________________
You might be screaming "No, no, no" and all they hear is "Who wants cake?" Let me tell you something: They all do. They all want cake.- Wilford Brimley
  Reply With Quote
Old 4th June 2005, 07:23 AM   #3
Danko is offline Danko  Hungary
diyAudio Member
 
Join Date: Apr 2004
Location: Hungary
7805 is a fixed +5V regulator, 7905 is a fixed -5V regulator, and 7815 and 7915 are +15V and -15V reguators
  Reply With Quote
Old 4th June 2005, 08:15 AM   #4
AndrewT is offline AndrewT  Scotland
diyAudio Member
 
Join Date: Jul 2004
Location: Scottish Borders
Hi,
you could also use 317/337 for +- supplies.
However you can cascade two positive supplies connecting the +ve out of one to the negative output of the other and using this common as your earth/ground/common return.
To do this you need two separate windings on your transformer and then two separate rectifiers. Do not common any of the wiring before the outputs of the regulators.
I hear that the performance of the +ve reg. is better than the -ve and that this cascading gives an overall improvement.
I have never built one but coming soon.
You could assemble a much cheaper 5A supply if you used a 1A or 1.5A reg. with booster transistor or FET as shown in the data sheets.
__________________
regards Andrew T.
  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


Similar Threads
Thread Thread Starter Forum Replies Last Post
Linear Power 952 clayton Car Audio 48 20th May 2009 03:01 AM
linear power schematics? ke4mcl Car Audio 4 30th April 2009 04:46 AM
Need Help with Linear Power 3.2HV Itsme Car Audio 31 8th July 2008 02:36 PM
Power One Linear Power Supply agent.5 Power Supplies 1 29th May 2006 06:06 PM


New To Site? Need Help?

All times are GMT. The time now is 02:13 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