[sdiy] Simple bell-EQ

[Neil Johnson]

Hi Colin,

Yes indeed, a lot of analogue design effort has gone into mixing desks
over the years.

Good luck finding one!

Cheers
Neil

On Tue, 7 Jul 2020 at 19:47, ColinMuirDorward <colindorward at gmail.com> wrote:
>
> 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
>> >>
>> >> _______________________________________________
>> >> Synth-diy mailing list
>> >> Synth-diy at synth-diy.org
>> >> http://synth-diy.org/mailman/listinfo/synth-diy
>> >
>> >
>> >
>> > --
>> > https://www.instagram.com/colinmuirdorward/
>> > -
>> > https://www.instagram.com/ssdp_synthesis/
>
>
>
> --
> https://www.instagram.com/colinmuirdorward/
> -
> https://www.instagram.com/ssdp_synthesis/