Audio Filter - Electronic Circuits Projects Diagrams Free

kevinkirkp · 29th January 2003, 03:13 AM

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** · 29th January 2003, 04:22 AM

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 · 29th January 2003, 05:17 PM

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 · 29th January 2003, 11:18 PM

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

An active audio filter

http://www.mitedu.freeserve.co.uk/Ci...udio/notch.htm

or

http://www.elecraft.com/TechNotes/notch_filter_wj4p.htm

and read the FULL article available at....

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

and have a look at the links on..

http://www.discovercircuits.com/A/a-filter-notch.htm

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

Have fun
:lol:

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29th January 2003, 03:13 AM	(permalink)
kevinkirkp	Audio Filter 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

29th January 2003, 04:22 AM	(permalink)
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. __________________ "There is no way to peace, peace is the way!"

29th January 2003, 05:17 PM	(permalink)
herbymcduff	If you are only wanting certain frequencies to your sub, try this formula L=R/(2piF(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/(2piF*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. __________________ \"If Noah had been truly wise, he would have swatted those two flies\" Joe Blaschka

29th January 2003, 11:18 PM	(permalink)
Pilot	Try the following.......... An active audio filter http://www.mitedu.freeserve.co.uk/Ci...udio/notch.htm or http://www.elecraft.com/TechNotes/notch_filter_wj4p.htm and read the FULL article available at.... http://www.analogzone.com/avt08062.htm and have a look at the links on.. http://www.discovercircuits.com/A/a-filter-notch.htm If you want anymore do a google search for 'audio notch filter' Have fun :lol: