LM337 and AN-181 - 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 22nd September 2010, 12:27 AM   #1
diyAudio Member
 
Join Date: Sep 2010
Default LM337 and AN-181

Hello everyone,

I'm new to posting here, but there is a wealth of knowledge I've been benefiting from here and for that I thank you. I have a LM337 design that I'm trying to do that goes off the 0-30V regulator example in AN-181 for the LM317. I've attached my schematic. Basically, I'm just trying to get a 0 to -5VDC output, and I've achieved that when there is no load. As soon as I attach a load, I get about -650mV no matter what the potentiometer is set to. Has anyone tried to implement AN-181's 0-30V regulator with a LM337?

Thanks in advance!

http://www.national.com/ds/LM/LM137.pdf
http://www.national.com/an/AN/AN-181.pdf (page 2-3)
Attached Images
File Type: jpg lm337.JPG (28.7 KB, 93 views)
  Reply With Quote
Old 22nd September 2010, 01:11 AM   #2
diyAudio Member
 
Join Date: Jan 2002
Location: Tyrone Ga. U.S.A.
You might look at the value of R69. Then look back at the aplication note you based this on. You will note they used a much lower resistor value to ensure the minimum
5ma current draw for a positive regulator and a 10ma current draw for a - regulator.
So first off try droping the value to ~120 ohms.
  Reply With Quote
Old 22nd September 2010, 01:11 AM   #3
VivaVee is offline VivaVee  New Zealand
diyAudio Member
 
Join Date: Jun 2004
Location: Auckland, NZ
The pin-out on your LM337 is wrong - it is different from the LM317.
__________________
Alan
Hope is not a reliable design discipline
  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
Another look at the LM317 and LM337 regulators jbau Power Supplies 331 6th December 2013 03:27 PM
Heathkit AA-181 schematic needed bobhedberg Tubes / Valves 0 15th November 2004 06:55 AM
LM337 problems jarthel Digital Source 7 11th June 2002 09:06 PM


New To Site? Need Help?

All times are GMT. The time now is 02:32 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