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Old 28th November 2006, 04:05 PM   #1
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Default Active filter/EQ examples and calculators

Hi everyone,

I wasn't sure if this should go in Electronics or this forum, but it seems more relevant here

Does anyone know of a website/book where I can get examples of, and calculators for active filters? It's specifically notch and shelving filters I'd like to be able to design but for the life of me can't find any theory or utilities for designing them

I bought 'The Active Filter Cookbook' from Wilmslow audio thinking it would all be in there but it isn't. It basically explains what each type of filter is, how it works and it's intended use but doesn't give any useful info for designing them.
I really want something along the lines of this but for an active version.

Thanks again
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Old 28th November 2006, 04:23 PM   #2
ch83575 is offline ch83575  United States
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Join Date: Jan 2005
Location: Michigan
This is probably the best description of the different configurations you can use to acomplish each of the necessary filters for a loudspeaker. There are formulas, but it always takes me a few minutes with pencil and paper to figure out his examples before i can jump right in and make the calculations for my own speaker. All in all it is very comprehensive (much like the rest of Mr. Linkwitz's site) but keep in mind that all of the filters presented could be acomplished in any number of other ways than the way he does it... they dont even need to use op-amps, they all can be done with descrete components as well.

Hope this is what you were looking for... Good luck

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Old 28th November 2006, 05:03 PM   #3
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FilterPro from Texas instruments is "freeware" and quite effective -- they also have free simulation software -- TINA on their site. LTSpice from Linear Technology is free as well.
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Old 28th November 2006, 08:17 PM   #4
Davey is offline Davey  United States
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Location: Bremerton, WA.
Some of the speaker-design programs will do this.

Try the demo version of LspCAD. It allows you to design active filters of various types. The demo version has limitations but it will still accomplish what you want.

Notch filtering with active circuits can take a bit of iteration and sometimes verifying with a prototype to make sure you got it right.


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Old 28th November 2006, 10:45 PM   #5
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Thanks very much!
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