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Old 21st April 2012, 03:25 PM   #1
BRSHiFi is offline BRSHiFi  United States
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Default Op-amp tone stack

For a 3 band equalizer tone control circuit, where do you recommend I place the center frequencies for each band? What should I make the bandwidth for each control, aka the frequency range the bass, mid, and high boosts and cuts?
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Old 21st April 2012, 04:05 PM   #2
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Just google baxandall tone stack and you should find quite a few verieties of tone stacks.
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Old 21st April 2012, 05:29 PM   #3
BRSHiFi is offline BRSHiFi  United States
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Most of the baxandall results just show existing circuits. Worst of all they do not give information that answers my question.

http://www.analogzone.com/avt08063.pdf

This pdf is really helpful when it comes to designing narrow-octave equalizers, but I am just looking to do a three band equalizer for now.

For a 3 band equalizer, i simulated a circuit using gyrator band filters that have the following specs:

- Bass: Cutoff frequencies at 10Hz and 400Hz. Center frequency 63hZ.

- Mid: Cutoff frequencies at 400Hz and 5200Hz. Center frequency 1442hZ.

- Treble: Cutoff frequencies at 5200Hz and 30000Hz. Center frequency to be determined.

Do you feel this is a good design, or do you think I should place the center frequencies and cutoffs elsewhere?

Last edited by BRSHiFi; 21st April 2012 at 05:36 PM.
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Old 21st April 2012, 05:56 PM   #4
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I've never dealt with tone controls.
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Old 21st April 2012, 05:58 PM   #5
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It's all about your preferences.
Typically, the bass and treble filters are of the 'shelving' variety rather than the bandpass variety.
Let your ears be your guide.
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Old 21st April 2012, 10:36 PM   #6
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What is the EQ for?
Take a piece of paper and show us on a graph (frequency vs. gain) what you want. E
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Old 22nd April 2012, 01:01 AM   #7
sreten is offline sreten  United Kingdom
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Hi,

Search and you shall find. There is a relatively simple 5 band tone stack
based on the "Cello" recently posted, as well as simpler variants. Its all
been covered before, the ideal tone control is not remotely a new idea.

rgds, sreten.
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Old 22nd April 2012, 01:06 AM   #8
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There is a three band version of the Baxandall you can find on the LF353 data sheet: http://www.ti.com/lit/ds/symlink/lf353-n.pdf

There was an example with equasions in an old National Applications book, but I haven't been able to track that down.
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