I want to show (graphically) the Gain/Attenuation vs frequency of a parametric equalizer.

This is my circuit:


The same schematicas as a screenshot:

enter image description here

I want to show the effect of VR1 thru VR7 in the same way as it's shown in the Winamp:

enter image description here

I have tried to decipher this page: https://www.andyc.diy-audio-engineering.org/parametric-eq-parameters-1.html

I don't know how to interpret the formulas to derive the Gain/Attenuation, given the frequency, Q and center frequency of each equalizer band. Can anybody please explain in simple terms?

  • \$\begingroup\$ I think my question was not clear. I am working on a project that has several bands of PEQ. I can programmatically alter centre F, Q and boost/cut. Given all these parameters, how do I show to the user what the resulting SPL curve is? \$\endgroup\$ – wonderfuliot Mar 22 at 4:33
  • \$\begingroup\$ I am sure its possible to show graphically the effect of the controls on spl. See figure 1 sound-au.com/project28.htm. \$\endgroup\$ – wonderfuliot Mar 24 at 6:51
  • \$\begingroup\$ I want to show the effect of VR1 thru VR7 in the way its shown in the winamp i.stack.imgur.com/TRKVD.png \$\endgroup\$ – wonderfuliot Mar 24 at 7:21
  • \$\begingroup\$ I rewrote your question. Now you have a possiblity to get answers instead of poor mouthing. All comments are now obsolete. Revert freely if you do not like it. \$\endgroup\$ – user287001 Mar 24 at 11:31
  • \$\begingroup\$ Instead of trying to plot the spectrum by formulas, you're much, much better off building the schematic in a SPICE simulator ans simulating with .AC. That's because the transfer function is very complex, but mostly any variation of the potentiometers will influence the outcome. A simulation will take care of these on the fly (and less error-prone). \$\endgroup\$ – a concerned citizen Mar 24 at 13:31

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