Lab Power Supply Current Limiting Q - diyAudio
Go Back   Home > Forums > Design & Build > Equipment & Tools
Home Forums Rules Articles diyAudio Store Gallery Wiki Blogs Register Donations FAQ Calendar Search Today's Posts Mark Forums Read

Equipment & Tools From test equipment to hand tools

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 21st September 2005, 01:10 PM   #1
Wynand is offline Wynand  South Africa
diyAudio Member
Wynand's Avatar
Join Date: Mar 2005
Location: Cape Town
Default Lab Power Supply Current Limiting Q

I'm currently designing a Lab Power Supply to use for various Audio Projects.

I'm using a PC Power supply for 5 12 -5 -12 Volts for a beginning but I want the +and- 0-35v Supply to be the heart of it.

I've decided to use the LM338 T0-3 as my positive voltage regulator.
It'll also be used for the current limiting (5A should be enough limiting?)

My problem is.... do I need a current limiting circuit on the negative supply line aswell or does all the current come from the positive side(what happens at GND in respect to -V)
  Reply With Quote
Old 21st September 2005, 01:21 PM   #2
Wynand is offline Wynand  South Africa
diyAudio Member
Wynand's Avatar
Join Date: Mar 2005
Location: Cape Town
Heres a pic to show what I dont understand
Attached Images
File Type: jpg current.jpg (28.7 KB, 138 views)
  Reply With Quote
Old 22nd September 2005, 03:08 AM   #3
ctardi is offline ctardi  Canada
diyAudio Member
Join Date: May 2005
Location: Maple Ridge
Send a message via MSN to ctardi Send a message via Yahoo to ctardi
Don't quote me on this, but i think it will work with only + Limited.
  Reply With Quote
Old 23rd September 2005, 06:27 PM   #4
Nordic is offline Nordic  South Africa
diyAudio Member
Nordic's Avatar
Join Date: Sep 2005
Wynand if you do manage to pull it off gimme a shout....
I'd be interested in the setup.... have a few PSU's I can pilage for parts...
  Reply With Quote
Old 27th September 2005, 10:44 PM   #5
diyAudio Member
TwoSpoons's Avatar
Join Date: Oct 2004
You DO need your current limit in both + and - supply. It is quite possible to pull current from GND to V- without any current from V+.

Connect light bulb from GND to V-. Does it glow? Of course it does!
  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
LM338 Current Limiting imix500 Parts 48 22nd October 2009 11:21 AM
Current limiting behavior?? stoc005 Solid State 10 10th February 2009 02:53 PM
Does any power amp have a current limiting device? beppe61 Solid State 44 22nd December 2005 11:47 PM
Load Current limiting k1jroth Solid State 2 20th November 2004 06:20 AM

New To Site? Need Help?

All times are GMT. The time now is 08:11 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