Audio Filter

[kevinkirkp]

Anyone know of any good circuit snippets that would allow me to filter certain audio frequencies? I am not looking to amplify, only supression. Hopefully something that would be rather simple and easy to compute the frequencies I want to supress. I couldnt find any good web sites about this.

Thanks,
Kevin

 

[kinjalgp]

If you don't need any amplification, a simple R-C or L-C band-reject filter will serve the purpose. But for proper impedance matching it is advisable to use operational amplifier based band-reject filter with unity gain.

 

[herbymcduff]

If you are only wanting certain frequencies to your sub, try this formula

L=R/(2pi*F(highest frequency you want the sub to let through))

L=the inductor you place in series with the + wire on the sub.
R=the impedence of the sub

If you are only wanting certain frequencies to your highs, try this formula

C=1/(2pi*F*R)

C=the capcitor you place in series with the + wire on the tweets.
R=the impedence of the tweet
F=the lowest frequency you want the tweet to let through

If you are only wanting certain frequencies to your mids, do this

Inquire the above formulas.

Hope this helped you.

 

[Pilot]

Try the following..........

An active audio filter

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or

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and read the FULL article available at....

http://www.analogzone.com/avt08062.htm

and have a look at the links on..

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If you want anymore do a google search for 'audio notch filter'

Have fun
:lol: