EQ Builds

[emilyandmiles]

Hi,
I used to have a pedal which allowed me to choose a single set frequency, and boost or cut it.
It was a fab little thing and I can't imagine coming across another, so I was wondering if there was a similar build out there, or if anyone recognises t?

Its the blue 1590b sized one.....



Thanks,
Miles

[Mark Hammer]

A rainbow of circuits to choose from. What you want is called a "parametric equalizer".  A conventional para-EQ has 3 controls: frequency, cut/boost, and bandwidth (or Q).  What you show appears to have only frequency and boost/cut.

If you are only interested in boosting, and don't require continuous control of centre-frequency, then the Craig Anderton frequency booster project is quite adaptable and about as easy and cheap to make as anything.  You'll find the schematic at AMZ and GGG.

If you don't need continuous frequency control, but DO need boost and cut, then just about any 3-band active tone-control circuit can be easily modded to change where the midrange control boosts and cuts.

You should also take a peek at the documents on geofex regarding EQ, and the simple parametric equalizer.

Note that you do not HAVE to have a chassis-mount Q control.  It is entirely your perogative to have it be a board-mounted trimpot, tweak it to how you want it, and leave only the boost/cut andfrequency controls visible/accessible up top.

[newbie builder]

Not to high jack the thread, but I was wondering if anybody has ever come across a schematic for the T.C. Electronic Dual Parametric E.Q.
It's a great pedal that has two bands (external bandwith, boost/cut, and frequency selection controls), as well as a master volume and knob dedicated to treble cut/boost.

Extremely useful pedal (if you can even call it that, it has a little on/off switch rather than a footswitch) and I'd love to find a schem for one (not made anymore, and the last one went on ebay yesterday for about 300 iirc).

[donald stringer]

Heres one that I just finishehttp://sound.westhost.com/project64.htmd. You can make it as big or small as you want. Sounds `great  It uses multiple feedback filters. I built an 8 filter version/ used the output mixer but bumped up the gain quite a`bit buy using an 500k pot.