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Old 8th March 2010, 12:55 PM   #1
marne is offline marne  Italy
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Default Active subwoofer

Hi to all. I am new and this is my first post.
Sorry for my English, but I'll try to do my best.
My intention is to build an active subwoofer crossover,for frequency of 20-180 Hz about -24db octave and let's say "full optionals". The web is full of this classic schematic, one for all Elliott Sound Products - The Audio Pages (Main Index) , but my intention is to build a switched capacitor filter, that according the few literature I have read , seems easy to build, and can be adapted to own needs.
Old Ic like LMF40 or LMF100 or similar should be usefull, but excluding the manufacturers' data sheets, too much cathedratic for me, on the web /Google , I have no help.
So I am asking if someone of you has experience in this matter and can suggest me some more informations to realize my filter.
Thank you for your help.
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Old 9th March 2010, 07:11 AM   #2
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Hi.

Your English is almost perfect, don't worry.

I found that Mr Linkwitz has many helpful circuits - I used an active low pass filter for my subwoofer, designed by him.
Active Filters

Chris
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Old 9th March 2010, 12:05 PM   #3
marne is offline marne  Italy
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Quote:
Originally Posted by chris661 View Post
Hi.

Your English is almost perfect, don't worry.

I found that Mr Linkwitz has many helpful circuits - I used an active low pass filter for my subwoofer, designed by him.
Active Filters

Chris
Hi Chris.
Thanks for all , but me too used in the passed Mr. Linkwitz' circuits, that are perfect and "classical" filters using linear IC ,but not circuits using switch capacitors IC I would like to experiment for a new active filters .
Mario
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Old 10th March 2010, 07:43 PM   #4
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Default switched capacitor filter IC

Why not take a look at the IC LTC1062 from Linear? This is a 5th order low-pass switched capacitor filter in a DIP-8 package. You need only a few components to make the filter work. You can set it up so that you can change the frequency. See the datasheet for details.

Most switched capacitor filters have poor noise, but this one is not bad.

-Charlie
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Old 11th March 2010, 10:16 AM   #5
marne is offline marne  Italy
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Thank you Charlie. Ok, this is interesting and started to read.
But I wonder why is difficult to find circuits using this ICs for filters considering few components,generally with standard values are needed to work.
Mario
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