Lm317 Reg - diyAudio
Go Back   Home > Forums > Design & Build > Parts

Parts Where to get, and how to make the best bits. PCB's, caps, transformers, etc.

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 29th August 2008, 11:45 PM   #1
diyAudio Member
 
Join Date: May 2008
Default Lm317 Reg

Hi i have just started building a power supply for my Naim 62 pre amp.
I did want to use a hicap but the cost has gone stupid so i am building one.
I have a transformer a case and i have also bought some lm317 regs, were i am stuck is knowing what resisters to use to set the volt out put, i was looking for 25v.
If anyone know which resisters to use please let me know,or anyone selling a hi cap.
Many thanks.
George.
  Reply With Quote
Old 30th August 2008, 07:59 AM   #2
Calvin is offline Calvin  Germany
diyAudio Member
 
Calvin's Avatar
 
Join Date: Nov 2004
Location: close to Basel
Hi,

load down the datasheet of the LM317. Everything from the formulas up to circuit examples is written in there!
http://www.alldatasheet.com/

jauu
Calvin
  Reply With Quote
Old 30th August 2008, 09:39 AM   #3
diyAudio Member
 
justblair's Avatar
 
Join Date: Jan 2007
Location: Glasgow, Scotland
Google is your friend on this...

Online calculator

This is one of several online calculators that will do the math for you..

The R1 tends to be set at 240R. I cant remember the criteria for selecting this value, I think its either in the datasheet or design application notes. Basicly though 120R to 240R work ok.

I am sure there is an online calculator that allows you to set your target voltage and derive R2, but I only searched for lm317 online calculator and chose the first one. If you take a little longer you might find it.
  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
Standard LM317, can get 50V? DragonMaster Power Supplies 18 20th April 2012 08:05 AM
Lm317 Soa Onvinyl Power Supplies 2 12th February 2008 04:12 PM
Lm317 jlm Power Supplies 9 2nd February 2006 08:31 PM
Vin MAX for LM317 ZERS Digital Source 4 17th January 2005 03:07 PM
LM317 getting hot! DieterD Everything Else 23 9th April 2002 10:57 AM


New To Site? Need Help?

All times are GMT. The time now is 06:36 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