Regulated PS w/ LM317 & LM337's - Page 3 - diyAudio
Go Back   Home > Forums > Amplifiers > Chip Amps

Chip Amps Amplifiers based on integrated circuits

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 20th June 2006, 07:27 AM   #21
Nicks is offline Nicks  Sweden
diyAudio Member
 
Join Date: Jan 2005
Location: South of Sweden
I have been looking at the LM350. According to the datasheet it guarantees 3A. It comes in TO-220 package and is a LOT cheaper here in sweden compared to the lm338.
__________________
It's so darn fun with HUGE machines!!!
  Reply With Quote
Old 20th June 2006, 01:31 PM   #22
diyAudio Member
 
Join Date: Oct 2004
http://www.repairfaq.org/sam/samschem.htm#schslp2
  Reply With Quote
Old 20th June 2006, 05:37 PM   #23
diyAudio Member
 
jacco vermeulen's Avatar
 
Join Date: Oct 2004
Location: At the sea front, Rotterdam or Curaçao
Send a message via Yahoo to jacco vermeulen
I'd go for the beefed-up version with IRF630/IRF9630 of Sam's schematic
__________________
The buck stops Here
  Reply With Quote
Old 10th October 2013, 02:51 AM   #24
diyAudio Member
 
Join Date: May 2008
Location: croatia
i know that thread is realy old but i will try to parallel 5x lm317 and 5x lm337 with 0.22r on each lm output and to lm3875 stereo amp ... i have big trafo with more than enough current but recitified voltage is around 40v per rail so i must regulate and i have lots of theese lm regulators available so i will try
  Reply With Quote
Old 10th October 2013, 04:23 AM   #25
diyAudio Member
 
Join Date: Jul 2003
Location: Dona paula, Goa
You cannot do it at 40V at the input, with 317/337 as they will not survive.

Gajanan Phadte
  Reply With Quote
Old 10th October 2013, 09:32 AM   #26
AndrewT is offline AndrewT  Scotland
diyAudio Member
 
Join Date: Jul 2004
Location: Scottish Borders
The 317/337 regulators are voltage rated for the difference between IN and OUT.

That usually means that start up can be a problem when using a high Vin.
__________________
regards Andrew T.
  Reply With Quote
Old 12th October 2013, 09:02 AM   #27
diyAudio Member
 
Join Date: May 2008
Location: croatia
so andrew t could i use these i need to drop only 10-12v from those 40v
  Reply With Quote
Old 12th October 2013, 09:08 AM   #28
diyAudio Member
 
abraxalito's Avatar
 
Join Date: Sep 2007
Location: Hangzhou - Marco Polo's 'most beautiful city'. 700yrs is a long time though...
Blog Entries: 104
Send a message via MSN to abraxalito Send a message via Yahoo to abraxalito Send a message via Skype™ to abraxalito
As Andrew says, start up could well be a problem. So could sudden short circuits. Also to get 0.22 ohm resistors to share the current well you'll probably need a preset pot on each of the regs to set the output voltages close enough together. 1% resistors won't get you close enough in practice where you're aiming for a high output voltage.
__________________
I have the advantage of having found out how hard it is to get to really know something... how easy it is to make mistakes and fool yourself. - Richard Feynman
  Reply With Quote
Old 12th October 2013, 12:12 PM   #29
diyAudio Member
 
Join Date: May 2008
Location: croatia
of course there will be pot to adjust them .. lot easier than matching resistors for me...

if lm-s are rated on 35v difference ,1.5A then everything i must take care of is not to put too big capacitor on lm outputs(amp input v) , in order not to blow them (lm317-s) on power up..is that correct?
  Reply With Quote
Old 12th October 2013, 12:26 PM   #30
diyAudio Member
 
abraxalito's Avatar
 
Join Date: Sep 2007
Location: Hangzhou - Marco Polo's 'most beautiful city'. 700yrs is a long time though...
Blog Entries: 104
Send a message via MSN to abraxalito Send a message via Yahoo to abraxalito Send a message via Skype™ to abraxalito
No, that's not correct - you must arrange the circuit so that under no circumstances the in-out voltage exceeds the max. The regs will fail above that, and sometimes spectacularly in my experience.
__________________
I have the advantage of having found out how hard it is to get to really know something... how easy it is to make mistakes and fool yourself. - Richard Feynman
  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
LM317/LM337 accuracy Stuey Power Supplies 6 25th May 2007 08:31 AM
regulated valve buffer with lm317 and lm337 ebijma Chip Amps 25 24th August 2004 06:34 PM


New To Site? Need Help?

All times are GMT. The time now is 11:06 AM.


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