Graphic EQ help

[Bill Mountain]

Over the last two nights I have been trying various active eq circuits with little success.  I have tried several different schematics from Geofex and such and I have a few basic questions that I can't find answers to. 

1. Do I need higher supply voltages than normal?  I breadboarded a Geofex and an ESP eq and I got a lot of distortion.

2. I do not need multiple frequency controls.  Is it correct to assume that I can build just the parts for the frequency I need or should I make some changes?

3. The rest of my preamp is discrete and I would like make my active eq discrete as well (nothing against IC's).  I know I can make a transistor gyrator but the bulk of graphic eq's are in the feedback path of an opamp and I'm not sure how to use a transistor for that same purpose.

Thanks!

[slacker]

Have a look at the schematic in this thread for a discrete graphic EQ http://www.diystompboxes.com/smfforum/index.php?topic=93485.0

Q1 is a buffer and Q2, Q3 and Q4 make up a discrete opamp. The base of Q2 is the non inverting input and the base of Q3 is the inverting input.

[Bill Mountain]

Have a look at the schematic in this thread for a discrete graphic EQ http://www.diystompboxes.com/smfforum/index.php?topic=93485.0

Q1 is a buffer and Q2, Q3 and Q4 make up a discrete opamp. The base of Q2 is the non inverting input and the base of Q3 is the inverting input.

How did I not see this?  Thanks!