[sdiy] Moog VCF output noise

[jhaible]

This circuit looks perfectly fine.
While I have not checked with an actual Mini, it works perfectly in my
own Minimoog clone.

BTW, there was another "correction" to that circuit, making R20 and R24
the same value. While I have no idea what is really in the original, until
someone shows me the contrary I will believe that the 100k and 220k
is *intentional*, compensating an unsymmetry from the "Early effect"
(different collector voltage on Q6 and Q8).

JH.



> Hmm...sounds like you are describing the +10V connection to the collector
> of Q6 in:
>
> http://www.nmrailrunners.org/temp/Minimoog-Service-9-09b.jpg
>
> When I checked, I was comparing values from the schematic against the
> Mini, but didn't look to see if the actual circuit contained any extra
> components not on the schematic.  Thanks - I'll check that when I get home
> tonight.
>
>
> ">>>marjan<<<" wrote:
>
> > There's a typo in the original schemo. Output stage of the vcf is
> > missing
> > a resistor I think. Rightmost pair has collectors connected directly
> > to +10v which is bad, it should go thru say another 1k2 to point where
> > 180 and 47 res and 100U cap meet (this is most logic to me). Check
> > this against your mini, I'm sure it's a typo (maybe collector just
> > go to the other side of 47ohm...).
> >
> > cheers,
> >
> > --
> >
> > marjan
> >
> > me    : Marjan Urekar
> > e-mail: urekar.m at eunet.yu
> > s-diy : http://surf.to/marjansystems
> > music : http://go.to/forcemajeure
>
>