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8th October 2003, 06:39 PM
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#1 |
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diyAudio Member
Join Date: Oct 2002
Location: England
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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
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What the hell are you screamin' for? Every five minutes there's a bomb or somethin'! I'm leavin! bzzzz! Droggon Attack! |
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8th October 2003, 07:56 PM
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#2 |
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diyAudio Member
Join Date: Oct 2002
Location: Croatia
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8th October 2003, 08:56 PM
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#3 |
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diyAudio Member
Join Date: Oct 2002
Location: England
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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.
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What the hell are you screamin' for? Every five minutes there's a bomb or somethin'! I'm leavin! bzzzz! Droggon Attack! |
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8th October 2003, 09:53 PM
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#4 | |
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diyAudio Member
Join Date: Apr 2002
Location: Llanddewi Brefi, NJ
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Quote:
TI has a good tutorial on their website. |
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9th October 2003, 10:05 AM
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#5 |
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diyAudio Member
Join Date: Oct 2002
Location: England
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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.
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What the hell are you screamin' for? Every five minutes there's a bomb or somethin'! I'm leavin! bzzzz! Droggon Attack! |
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9th October 2003, 12:26 PM
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#7 |
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diyAudio Member
Join Date: Oct 2002
Location: Croatia
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6th February 2004, 10:06 PM
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#8 | |
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diyAudio Member
Join Date: Jul 2002
Location: Denmark - Jutland
 
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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:
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