Just use a ± supply.

 

no. you do not get it. check your threads. this is the FIRST time you've ACTUALLY asked me to express it in my own words. i get you are all for education, but i am all for clarity. you get that?

My first sentence.

Without having some definition of what you mean by "correct", it would be difficult to give you a definitive answer.

Why did you think pasting words from the paper would answer that request? Are you telling that me that missing a definition for what you mean by "correct" was somehow ambiguous?

 

Simply look at the datasheet of the LM833 to see that its maximum output swing is symmetrical then since it has a DC gain of 2 times you use simple arithmetic to calculate a value of R14 so that the voltage feeding the + input of the opamp is 1/4 of the supply voltage. You might not need R14 parallel to R12 so that only a single resistor can do it.

Why do the professors allow the assignment to be posted on the internet when it is completely wrong??

The answer to that seems obvious to me; either he did not know, or he did not care, especially if, as it seems, it has appeared in more than one place. We're not sure what grade he got, but it might not have been very good if the professor was paying attention.

 

let me answer your first question. i thought pasting what i found would answer that request because i know for a fact, that i dont know what im doing and i need assistance. thats why i thought pasting what i found, would help. and for me to answer your second question would be me repeating what i said the first time, just in a more passive aggressive way, which wont benefit me much

 

Simply look at the datasheet of the LM833 to see that its maximum output swing is symmetrical then since it has a DC gain of 2 times you use simple arithmetic to calculate a value of R14 so that the voltage feeding the + input of the opamp is 1/4 of the supply voltage. You might not need R14 parallel to R12 so that only a single resistor can do it.

Why do the professors allow the assignment to be posted on the internet when it is completely wrong??

as long as we can correct it, we will be fine

 

For your interest, below is the LTspice simulation of a graphic equalizer that uses a gyrator circuit (which simulates an inductor).
Its a somewhat simpler than the MFB filter circuit used in Max's proposed circuit.

The simulation is shown for two (500 and 1000Hz) of the nine frequencies in this design, for pot positions 0%, 25%, 50%, 75%, and 100%, with one at maximum while the the other is at minimum.
Results for just the 1kHz filter are shown below that.

The component values for the other frequencies are shown in that attached table (R1 is the bottom resistor to ground.)
If you want just 5-bands, then you can adjust the component values proportionally.