Dimensioning LC power supply filter - 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 10th December 2005, 09:09 PM   #1
Stefano is offline Stefano  Italy
diyAudio Member
 
Join Date: Jun 2002
Location: Cagliari, Sardinia
Default Dimensioning LC power supply filter

Hi to you guys!
Is there anyone that knows how to dimension an LC power supply filter?
Charles Hansen? Nelson Pass?

Thank you all!!!
__________________
Let's make something special
  Reply With Quote
Old 11th December 2005, 08:58 AM   #2
AndrewT is offline AndrewT  Scotland
diyAudio Member
 
Join Date: Jul 2004
Location: Scottish Borders
Hi,
try "choke regulated", it may find you some links. A post recently referred to a good site that had all the design data.
__________________
regards Andrew T.
  Reply With Quote
Old 11th December 2005, 09:20 AM   #3
Luke is offline Luke  New Zealand
diyAudio Member
 
Join Date: Sep 2001
Location: Wellington NZ
Send a message via AIM to Luke
you could try download Duncans PSU designer and model it.
I think typically Nelson suggests 2mH for the L.
  Reply With Quote
Old 11th December 2005, 09:38 AM   #4
diyAudio Member
 
Join Date: Jan 2002
Location: Tyrone Ga. U.S.A.
On the Pass Labs forum there is a thread, SON choke input filter?
giving the basic formulia L(henries)= E(volts)/I(miliamps)

But it`s easier to use Duncans power designer software it`s
real easy to learn.
  Reply With Quote
Old 13th December 2005, 09:26 AM   #5
Eva is offline Eva  Spain
diyAudio Member
 
Eva's Avatar
 
Join Date: Oct 2003
Location: Near the sea
Send a message via MSN to Eva
I find designing LC filters quite an intuitive process. I use a circuit simulator capable of inmediately producing new bode plots in response to any circuit change (the good old Electronics Workbench) and I play with L, C, and ESR values until I get the desired (non-peaking) frequency response. Note that modelling inductor and capacitor ESR values is fundamental in order to obtain consistent results, because filter resonance damping depends entirely on these resistances.
  Reply With Quote
Old 13th December 2005, 06:57 PM   #6
Luke is offline Luke  New Zealand
diyAudio Member
 
Join Date: Sep 2001
Location: Wellington NZ
Send a message via AIM to Luke
Hi Eva,

I can vaguely remember learning about resconant frequency of power supplies. The idea is to avoid resconance in the audio spectrum isnt it? Do you know what the formulas are for this?


seeya arthur
  Reply With Quote
Old 17th December 2005, 08:36 AM   #7
Stefano is offline Stefano  Italy
diyAudio Member
 
Join Date: Jun 2002
Location: Cagliari, Sardinia
Thank you all guys!

I've found on others treads those links:

http://www.qsl.net/i0jx/supply.html

http://www.tpub.com/content/neets/14...193.htm:Pinoc:
__________________
Let's make something special
  Reply With Quote
Old 17th December 2005, 07:44 PM   #8
diyAudio Member
 
Join Date: Dec 2004
Location: Roosendaal
Hi Stefano,

impressive reading. In the pass forum there also has been a thread on which chokes to use, and some practical calculations.

Check out:
inductor/choke/air core/ferrite core. . . same thing?

Greetings,
Harry
  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
Dimensioning of exotic pandpass filter SwedishWings Everything Else 0 29th January 2008 03:41 PM
Power supply filter mod Ty_Bower Tubes / Valves 3 21st July 2007 01:50 AM
pi-filter Power supply for Alephs Stefanoo Pass Labs 25 4th May 2007 03:38 PM
How do I diy Hi-End filter power supply and power cord? bmpa Parts 6 24th April 2004 12:12 AM
Why not put filter caps in power supply? Joshua Layne Chip Amps 7 31st January 2004 03:50 PM


New To Site? Need Help?

All times are GMT. The time now is 03:18 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