[sdiy] Vactrol'ed Moog Parametric !

[JH.]

I made some simulation of the Moog Parametric EQ, and it's an interesting EQ 
indeed.
Complete with side effects, like an ever so slight boost of the topmost 
audio range when you're setting an attenuation in the bass range ...
I'm convinced it's something special, now. :)

As for the potentiometers: We could emulate them with vactrols, and adjust 
the different control law in the CV domain.
Same with the reverse audio frequency pot.

So, what about a circuit that has the charcter of the Moog ParaEQ, plus 
Voltage control over frequency and Bandwidth of each band, plus the nice CV 
slewing Vactrols are famous for?

Would that make an interesting PCB of its own?!

JH.


----- Original Message ----- 
From: "Florian Anwander" <Florian.Anwander at consol.de>
To: "megaohm" <megaohm1 at gmail.com>
Cc: "JH." <jhaible at debitel.net>; <synth-diy at dropmix.xs4all.nl>
Sent: Tuesday, November 27, 2007 9:42 AM
Subject: Re: [sdiy] Re: Moog Parametric?


Hi P.

>>Buy a dual 500R lin pot of a brand that can be opened, and a single 50k 
>>log
>>pot of the same brand.
>>And then it's time for transplantation!
>>(I did this once with a pull pot that had the wrong value.)
> Ummm.... BRILLIANT!
I did this too, but the one I modified was not that reliable as the
usual pots. The transplanted started to scratch after two years, while
the unmodified lived fine for ten or twelve years (it was a crossfader
for live usage).

Florian