What I found educational when I needed to add EQ to something was to build this simple add-on circuit:
http://tagboardeffects.blogspot.co.uk/2013/08/bmp-tonestack-w-lpb1.html
It has only a single tone control, but it can be scooped (well, there is a mid-scoop by default) and offers active boost to treble and bass as well as cut (albeit not independent of each other: boosting treble is coupled to cutting bass and vice versa).
Here's the best bit: this free software simulates the circuit (amongst others) so you can see what effect changing component values will have:
http://www.duncanamps.com/tsc/
I guess you could even add switches to 're-voice' the EQ with different component values. I found it a great intro to active EQ, and built it with an 'unscooped' response for use in an active acoustic guitar circuit, where due to careful choice of component values it does pretty much exactly what I needed.
Of course there are more sophisticated tone-stacks, but I found this an ideal first step...
http://tagboardeffects.blogspot.co.uk/2013/08/bmp-tonestack-w-lpb1.html
It has only a single tone control, but it can be scooped (well, there is a mid-scoop by default) and offers active boost to treble and bass as well as cut (albeit not independent of each other: boosting treble is coupled to cutting bass and vice versa).
Here's the best bit: this free software simulates the circuit (amongst others) so you can see what effect changing component values will have:
http://www.duncanamps.com/tsc/
I guess you could even add switches to 're-voice' the EQ with different component values. I found it a great intro to active EQ, and built it with an 'unscooped' response for use in an active acoustic guitar circuit, where due to careful choice of component values it does pretty much exactly what I needed.
Of course there are more sophisticated tone-stacks, but I found this an ideal first step...