Active notch filter - diyAudio
Go Back   Home > Forums > Amplifiers > Solid State

Solid State Talk all about solid state amplification.

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 8th October 2003, 06:39 PM   #1
diyAudio Member
 
5th element's Avatar
 
Join Date: Oct 2002
Location: England
Default Active notch filter

http://www.linkwitzlab.com/filters.htm#7

This shows a notch filter.

Does anyone know the design formula for design B?

Am I being an idiot and not recognising that its actually there?

Cheers for any help Matt
__________________
What the hell are you screamin' for? Every five minutes there's a bomb or somethin'! I'm leavin! bzzzz!
  Reply With Quote
Old 8th October 2003, 07:56 PM   #2
moamps is offline moamps  Croatia
diyAudio Member
 
Join Date: Oct 2002
Location: Croatia
Hi,

http://www.linkwitzlab.com/images/graphics/inductr2.gif

Regards
  Reply With Quote
Old 8th October 2003, 08:56 PM   #3
diyAudio Member
 
5th element's Avatar
 
Join Date: Oct 2002
Location: England
Yes that tells you how to calculate the value of the inductor.
But what about the frequency it all works at?
The Q of the notch? and
The size of the notch (db)?

I knew about that bit but not the rest.
__________________
What the hell are you screamin' for? Every five minutes there's a bomb or somethin'! I'm leavin! bzzzz!
  Reply With Quote
Old 8th October 2003, 09:53 PM   #4
diyAudio Member
 
jackinnj's Avatar
 
Join Date: Apr 2002
Location: Llanddewi Brefi, NJ
Quote:
Originally posted by 5th element
Yes that tells you how to calculate the value of the inductor.
But what about the frequency it all works at?
The Q of the notch? and
The size of the notch (db)?

I knew about that bit but not the rest.
You should probably step back for a minute and take a look at some of the tutorials on filter design.

TI has a good tutorial on their website.
  Reply With Quote
Old 9th October 2003, 10:05 AM   #5
diyAudio Member
 
5th element's Avatar
 
Join Date: Oct 2002
Location: England
Look I have used active filters in the past to great effect and am in the process of building another. I know how to use them. This project tho calls for a notch filter which I have never had to use before. So hence I dont know how to calculate one. All I need to know is the formulas. If TI has this which I will look into then great. I was just wondering wheather anyone knew the formula LW has used in that notch.
__________________
What the hell are you screamin' for? Every five minutes there's a bomb or somethin'! I'm leavin! bzzzz!
  Reply With Quote
Old 9th October 2003, 12:20 PM   #6
diyAudio Member
 
jackinnj's Avatar
 
Join Date: Apr 2002
Location: Llanddewi Brefi, NJ
I don't think that Linkwitz changed any of the principles of electrical engineering.

Q = w0 RC
  Reply With Quote
Old 9th October 2003, 12:26 PM   #7
moamps is offline moamps  Croatia
diyAudio Member
 
Join Date: Oct 2002
Location: Croatia
Gyrator (simulate inductor)

http://www.national.com/an/AN/AN-435.pdf
Attached Images
File Type: jpg gyrator.jpg (30.1 KB, 217 views)
  Reply With Quote
Old 6th February 2004, 10:06 PM   #8
diyAudio Member
 
JensRasmussen's Avatar
 
Join Date: Jul 2002
Location: Denmark - Jutland
Send a message via ICQ to JensRasmussen Send a message via MSN to JensRasmussen
Default I think there is an error here ?

Hi,

The drawing has an error I think.

The parallel resistor across the inductor needs to be R2-R1.

Quote:
Originally posted by moamps

http://www.linkwitzlab.com/images/graphics/inductr2.gif
\Jens
  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
need help wana change 60-Hz twin-T notch filter to 279 Hz filter prorms Solid State 0 9th February 2008 11:38 PM
Can Zaphs notch filter be used without the BSC filter? GuyPanico Full Range 0 21st July 2007 01:27 AM
Active Notch Filter design needed Vikash Multi-Way 63 21st May 2007 05:14 PM
Notch filter qguy Multi-Way 3 26th October 2006 09:26 PM
Noise out of active notch filter reins Multi-Way 0 6th July 2006 07:34 PM


New To Site? Need Help?

All times are GMT. The time now is 07:26 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