[sdiy] Moog VCF idea

[mikko.a.helin at nokia.com]

Shouldn't the 3080(s) be buffered? Also the Q control 3080 could use a
simply two transistor v2c converter.
-Mikko

> -----Original Message-----
> From: ext [mailto:houshu at muj.biglobe.ne.jp]
> Sent: 12. December 2001 4:31
> To: Paul.Maddox at wavesynth.com; synth-diy at dropmix.xs4all.nl
> Subject: Re: [sdiy] Moog VCF idea
> 
> 
> Hi Paul,
> 
> Anode of D7 (right side) should be connected to pin 2 of U7, 
> not pin 6.
> In your circuit, no current flows from pin 5 of 3080 (Iabc) 
> to pin4 (-Vcc).
> These pins (5 and 4) should be in the feedback loop of U7.
> 
> Osamu Hoshuyama,  Kawasaki JAPAN.
> 
> > Dear all,
> > 
> >   Can anyone see any reason why this shouldn't work?
> > 
> > http://www.modulus.wavesynth.com/projects/CV_MOOG_VCF.pdf
> > 
> > (15k PDF)
> > 
> > I'm hopeing to add CV control of resonance to the Moog 
> ladder, without
> > useing special VCA chips..
> > 
> > Paul
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