Charles,
you're right! Just tested that. It's up to about 30mV
peak-to-peak and goes away when LP Freq is decreased.
I never noticed that before since the filter is before
the VCA in my setup and with a blast of SAW or
whatever fed into the filter it's like 50x less than
the signal itself.
Even when I connect the filter directly into the amp
without any VCA it's very very little - as you said
-75dB. What I notice a lot more are the transient DC
offsets that happen when LP freq is changed. Those can
go up to 0.2V. But after googling for that I found
that this happens in many (all??) state-variable
filters... I think this is from the CA3280.
Best,
Dino
--- Charles Stella <
cstella@...> wrote:
> The LP out with Freq LP at 10 generates white noise
> at about -75dB.
> The Noise lessens as the Freq LP pot is rotated CCW
> (LP working!)
>
> I had asked Paul about it when was here for AH and
> he said that was
> 'normal' for this filter.
>
> I would be very happy to learn this is not the case
> and that is is an
> part or construction problem.
>
> Anyone else have this?
>
> Thanks, Charles.
>
>
>
> The noise
> On Jan 8, 2006, at 12:14 PM, Dino Leone wrote:
>
> > --- Charles Stella <cstella@...> wrote:
> > > I wonder while we are at it is there a
> > > way to address the
> > > noise problem the 480 exhibits in LP mode?
> Thanks,
> > > Charles.
> >
> > Noise problem? What are you talking about? Maybe
> I'm
> > deaf... could you explain?
> > Best,
> >
> > Dino
> >
> >
> >
> >
> >
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