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A little help with a "tank" circuit?

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Anonymous   04-01-2005 at 03:23:14 AM

Archived from groups: rec.audio.tech (More info?)

 

I have forgotten what the governing equation is (more specifically if
the equation involves just "f" or is it "2pi*f" ). If I have this 10 mH
inductor lying around, what capacitor should I combine it with to
create a 200 Hz notch circuit? This is for a full-range coax speaker
in a car. I have calculated a value of 63-ish uF for the cap. Am I on
track?

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Pete   04-01-2005 at 05:52:55 PM
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Archived from groups: rec.audio.tech (More info?)

 

"dangling entity" <randycat99@earthlink.net> wrote in message
news:1112329394.844497.4530@l41g2000cwc.googlegroups.com...
> I have forgotten what the governing equation is (more specifically if
> the equation involves just "f" or is it "2pi*f" ). If I have this 10 mH
> inductor lying around, what capacitor should I combine it with to
> create a 200 Hz notch circuit? This is for a full-range coax speaker
> in a car. I have calculated a value of 63-ish uF for the cap. Am I on
> track?
>
Yes you are right, at resonance:

F=1/(2*pi*Square root(L*C)

Sorry couldn't find the correct mathamatical symbols.

Works out at 200.5 Hz

Pete

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Anonymous   04-02-2005 at 04:28:05 AM
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Archived from groups: rec.audio.tech (More info?)

 

Thanks for postin' in! Time to solder-up...

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Anonymous   04-02-2005 at 04:42:55 PM
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Archived from groups: rec.audio.tech (More info?)

 

The filter will also have -3dB points of 120 and 360 Hz -- and because of
the complex load there will be a secondary notch of about -2dB around 50 Hz.


"dangling entity" <randycat99@earthlink.net> wrote in message
news:1112419685.154130.245870@g14g2000cwa.googlegroups.com...
> Thanks for postin' in! Time to solder-up...
>

Reply to Anonymous
Anonymous   04-02-2005 at 08:40:22 PM
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Archived from groups: rec.audio.tech (More info?)

 

Interesting point about the secondary notch. I've never been exposed
to this side of the design. I guess it is good I would be applying
this filter to the upper range speaker rather than the sub.

I take it the primary notch specs you have cited are for a "no
resistor" filter scenario? If I add in a parallel resistor to tweak
the final output, will the -3 dB points change, or does it just affect
the depth of the notch frequency mostly?

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