PSU Smoothing Caps (how many?) - diyAudio
Go Back   Home > Forums > Amplifiers > Chip Amps
Home Forums Rules Articles diyAudio Store Gallery Wiki Blogs Register Donations FAQ Calendar Search Today's Posts Mark Forums Read

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
Thread Tools Search this Thread
Old 6th September 2004, 12:53 PM   #1
MWP is offline MWP  Australia
diyAudio Member
Join Date: Oct 2002
Location: Adelaide, South Australia
Default PSU Smoothing Caps (how many?)

Hi all,

Im going to start building my new amp tomorrow and am trying to work out what total capacity of PSU smoothing caps ill need.

Ill be using 3 * 300VA 25-0-25 torids (=900VA total) to power 6 channels of 2 * LM3886s bridged per channel.

Is the general rule in here of 2*1000uF caps per amp IC (=24,000uF total in this case) enough?
Or will i be needing more than this?

  Reply With Quote
Old 6th September 2004, 01:53 PM   #2
Nuuk is offline Nuuk  United Kingdom
diyAudio Member
Nuuk's Avatar
Join Date: Feb 2003
Location: Somerset, SW England
If some of those channels are just supplying a bass speaker or sub, then you could add something like 2 x 10,000 uF for those channels.
The truth need not be veiled, for it veils itself from the eyes of the ignorant.
  Reply With Quote
Old 6th September 2004, 03:11 PM   #3
MWP is offline MWP  Australia
diyAudio Member
Join Date: Oct 2002
Location: Adelaide, South Australia
Hmmm, ok.
Well ive got 2*470uF on each amp IC on the PCB already.

So, say another 22,000uF on each rail would do it?
  Reply With Quote
Old 7th September 2004, 03:57 AM   #4
JhonDoe is offline JhonDoe  Philippines
diyAudio Member
Join Date: Jan 2004
Location: ac
Well ive got 2*470uF on each amp IC on the PCB already.
are 2*470uf per chip is enough?? I thought 2*1000uf per chip is the recommended? what will be the effect of this lower caps in sound quality?
  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
Help sizing psu smoothing cap riotubes Parts 5 8th July 2009 07:07 PM
Smoothing Cap: ESR or Capacitance kptseng Solid State 2 23rd February 2008 05:23 PM
Problem building a power supply, no output after smoothing caps? markiemrboo Parts 11 15th January 2007 05:10 PM
Oops squashed my smoothing caps!! Beggar Parts 1 6th September 2003 09:43 AM
HV smoothing capacitors DeXXSter Tubes / Valves 8 11th December 2001 10:10 PM

New To Site? Need Help?

All times are GMT. The time now is 05:43 PM.

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