[sdiy] Simple bell-EQ

[ColinMuirDorward]

Thanks Neil!
That v12 service manual is a nice resource.
I've been gasing for a crest console for ages, they come up quite often in
Canada, but not yet in my town.
Colin

On Tue, Jul 7, 2020 at 1:06 AM Neil Johnson <neil.johnson71 at gmail.com>
wrote:

> Hi Colin,
>
> Try this:
> https://lmgtfy.com/?q=crest+audio+v12+service+manual
>
> Direct link to the service manual in case the above doesn't work:
> https://www.opweb.de/english/company/Crest_Audio/V12
>
> I think page 17 is the first appearance of the EQ.
>
> Ah, found the thread:
> https://www.proaudiodesignforum.com/forum/php/viewtopic.php?f=6&t=1220
>
> Neil
>
> On Tue, 7 Jul 2020 at 03:44, ColinMuirDorward <colindorward at gmail.com>
> wrote:
> >
> > Neil, do you have any further hints about where this thread is? Do you
> mean GS?
> > Thanks,
> > Colin
> >
> > On Mon, Jul 6, 2020 at 3:56 PM Neil Johnson <neil.johnson71 at gmail.com>
> wrote:
> >>
> >> 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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> >
> >
> >
> > --
> > https://www.instagram.com/colinmuirdorward/
> > -
> > https://www.instagram.com/ssdp_synthesis/
>


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