[sdiy] Simple bell-EQ

ColinMuirDorward colindorward at gmail.com
Tue Jul 7 01:45:30 CEST 2020

Neil, do you have any further hints about where this thread is? Do you mean

On Mon, Jul 6, 2020 at 3:56 PM Neil Johnson <neil.johnson71 at gmail.com>

> On Mon, 6 Jul 2020 at 20:11, Rutger Vlek <rutgervlek at gmail.com> wrote:
> >
> > Hi list,
> >
> > I’m hoping for some collective wisdom on the following issue. I’m trying
> to make myself a fancy (analog) guitar buffer with some basic tone
> controls. I already implemented a switchable high shelf filter (bright
> switch), and an adjustable 1-pole HPF for cutting bass. Now i would also
> like to implement a switchable mid-frequency scoop. With a VST parametric
> equalizer I found a bell-shaped curve with a certain Q and frequency I
> liked, and would like to implement this with a switch to select a few
> preset gains (boost/scoop). But I struggle to find a good analog circuit
> topology that fits my (simple) needs. Google turns up a lot of digital
> implementations, or way too complex equalizer circuits where every aspect
> can be controlled, but of which I don’t understand how to set gain, Q and
> frequency. Any suggestions for a simple bell-shaped EQ for which Q, gain
> and frequency can be set (and forget)?
> On one of the pro audio diy forums I frequent (it's a difficult habit
> to kick...) there was a recent thread on 2-opamp parametric EQ
> circuits.  See if you can google Crest Century V12.
> Neil
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