[sdiy] Voltage controlled version of Moog Parametric EQ circuit?

[Stavros Gregoriou]

YES, I would go for two PCB's

Thanks

SG


--- "JH." <jhaible at debitel.net> wrote:

> Hi,
> 
> while asking around about filters to be included
> into my proposed "famous 
> fixed filters" PCB,
> another idea came up, which has caused a lot of
> resonance so far:
> People want a Moog(TM) parametric EQ.
> (Moog is the registered trademark of Moog Music. The
> Moog Parametric EQ was 
> based on a - now expired - patent of Dr. Moog and
> Norlin. AFAIK)
> 
> But just cloning that circuit woud be boring, and
> would require very special 
> potentiometers.
> 
> So why not design something that is even better than
> the original, while 
> still preserving the original's behaviour?
> This leads to the voltage controlled M-Para-EQ.
> 
> The PCB would contain the electronics for the EQ,
> including the voltage 
> controlled frequency sweep.
> Everybody has the choice to build it as a voltage
> controlled device, or just 
> like a "simple" Moog-style parametric EQ.
> 
> Options for Frequency control:
> 
> (F1) Voltage controlled sweep, either of individual
> bands, and/or of all 
> bands with one CV. Manaul control of frequencies
> with ordinary linear 
> potentiometer.
> (F2) Manual frequency setting with dual 100k reverse
> audio taper (-log) 
> potentiometers
> (F3) Manual frequency setting with dual 100k audio
> taper (log) 
> potentiometers.EMS-HiFli style front panel labeling
> that allows for high 
> frequencies to be on the ccw end of pot.
> (F4) 23-position rotary switch (as used in High End
> Audio Amps) for precise 
> setting and recall of frequency, but without
> continuous sweep.
> (F5) 23-position rotary switch for precice manual
> frequency setting, plus 
> voltage control for continuous sweep.
> 
> Options for Bandwidth control:
> 
> (B1) 6-position rotary switch. (You can use a
> 23-position as well, but that 
> would be overkill, IMO.)
> (B2) Build your own special pot from a dual 50k log
> and a single 500R lin 
> pot, and some adventurous transplantation.
> 
> Options for Cut/Boost control:
> 
> (G1) Potentiometer (no special type required)
> (G2) Rotary switch (11-position or 23-position)
> 
> Any combinations of F, B and G options are possible,
> by just connecting 
> different front panel parts to the same PCB.
> 
> Interested?
> 
> JH. 
> 
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> 



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