SV: Re: SV: Re: SV: [sdiy] QVCO schemo up

[Don Tillman]

   > Date: Sat, 12 Nov 2005 20:24:03 +0100 (CET)
   > From: karl dalen <dalenkarl at yahoo.se>
   > 
   > --- Don Tillman <don at till.com>:
   > > 
   > > Right.  There's a large class of circuits made from filters and
   > > feedback that will oscillate when you crank up the resonance.
   > > That includes the Moog Ladder filter and State Variable
   > > Filters.
   > 
   > So a filter that oscillates is a oscillator
   > and a oscillator that dont oscillate is a filter?

Not exactly... 

If it oscillates, it's an oscillator.  If it filters, it's a filter.

(A "function generator" style oscillator will never operate as a
filter, and probably all synth VCO's are function generator
oscillators, so an oscillator that doesn't oscillate is not
necessarily a filter.)

But more importantly for those of us building synthesizers, we care
about an oscillator that performs really accurately, or in a musically
interesting way, as an oscillator.  And we want a filter that performs
really accurately, or in a musically interesting way, as a filter.

   > What is then the moog source function generator when multipple
   > triggered?  A oscillator, a function generator or a first order
   > filter!?

I don't have a schematic of the Moog Source so I couldn't say.

  -- Don

-- 
Don Tillman
Palo Alto, California
don at till.com
http://www.till.com