MOTM

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
> >
> >
> >
> >
> >
> > __________________________________________
> > Yahoo! DSL \ufffd Something to write home about.
> > Just $16.99/mo. or less.
> > dsl.yahoo.com
> >
> >
> > YAHOO! GROUPS LINKS
> >
> >  Visit your group "motm" on the web.
> >
> >  To unsubscribe from this group, send an email to:
> >  motm-unsubscribe@yahoogroups.com
> >
> >  Your use of Yahoo! Groups is subject to the
> Yahoo! Terms of Service.
> >
> >
> 
> 



		
__________________________________________ 
Yahoo! DSL \ufffd Something to write home about. 
Just $16.99/mo. or less. 
dsl.yahoo.com