Placing regulator chip close to amplifier - 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 6th June 2010, 07:20 PM   #1
diyAudio Member
 
terranigma's Avatar
 
Join Date: Feb 2007
Default Placing regulator chip close to amplifier

I'm gonna place LM338's on same heatsink with LM3875 chips in my dual-mono setup. Transformer will be placed into its own box. I will use 60-70cm power cable between amp and transformer box.

In this case, which option below will you recommend for me? Or any advise?

Transformer + rectifier + filter cap + 100nf bypass cap --CABLE--> LM338
Transformer + rectifier + filter cap --CABLE--> 100 nf bypass cap + LM338
Transformer + rectifier --CABLE--> filter cap + 100 nf bypass cap + LM338
  Reply With Quote
Old 7th June 2010, 06:03 AM   #2
RJM1 is offline RJM1  United States
diyAudio Member
 
Join Date: Jan 2010
Location: Titusville, Fl.
To quote the LM338 data sheet "Normally, no capacitors are needed unless the device is situated more than 6 inches from the input filter capacitors in which case an input bypass is needed." Go with #2 because your 60-70cm is more than 6 inches. You don't want #3 as your cables would radiate all the high current spikes between your rectifiers and your filter caps.
  Reply With Quote
Old 7th June 2010, 10:19 AM   #3
diyAudio Member
 
terranigma's Avatar
 
Join Date: Feb 2007
Thank you RJM, I have checked LM338 manual but I could not determine which section to read to find this information. I will go with #2..
  Reply With Quote
Old 7th June 2010, 11:51 AM   #4
RJM1 is offline RJM1  United States
diyAudio Member
 
Join Date: Jan 2010
Location: Titusville, Fl.
Page 1
Attached Images
File Type: jpg LM338.jpg (135.5 KB, 81 views)
  Reply With Quote
Old 8th June 2010, 08:47 AM   #5
diyAudio Member
 
terranigma's Avatar
 
Join Date: Feb 2007
I just noticed that without any negative opinions about your directions.. Thank you again..
  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
Help needed to identify a boost regulator chip. ashok Power Supplies 11 15th September 2009 03:53 AM
Placing port for two-way system REALFLEO Multi-Way 1 25th November 2006 11:29 AM
CD player Drawer open close open close open close qguy Digital Source 7 23rd November 2006 08:58 PM
Placing the powertransformer icebear Tubes / Valves 13 22nd November 2004 10:03 AM
Placing the port(s) behind the drivers cm961 Multi-Way 9 18th June 2003 04:54 AM


New To Site? Need Help?

All times are GMT. The time now is 10:59 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