200e

Mine doesn't quite self oscillate unless I feed one of the filters back into the input.


--- On Tue, 5/13/08, ezra buchla <ezra.buchla@gmail.com> wrote:

> From: ezra buchla <ezra.buchla@gmail.com>
> Subject: Re: [200e] Some questions about the 291e
> To: 200e@yahoogroups.com
> Date: Tuesday, May 13, 2008, 4:33 PM
> hello
> 
> there are three filters in the 291e. each has its own
> output; there is also
> a summed output of all filters, each with its
> "amplitude" applied. so
> amplitude means exactly that; like a builtin vca for each
> filter, except it
> can actually apply some gain as well as attenuation. the CV
> inputs for
> amplitude feed the same circuits as the AM audio inputs.
> 
> the 0 - 100 scale of "bandwidth" is an arbitrary
> percentage. actually the
> label "bandwidth" is misleading because this is
> really a sort of Q  or
> resonance control (something like center freq / bandwidth,
> except not really
> linear). self-oscillation is certainly possible.
> 
> i think the 291e is pretty essential. combined with a CV
> source it is can be
> like a small system unto itself; i often find myself
> performing with a 291e
> and 281 in a 2p powered boat...
> 
> -eb
> 
> On Tue, May 13, 2008 at 1:14 PM, jjsynth
> <jjsynth@yahoo.com> wrote:
> 
> >   hi,
> >
> > - what is meant by 'Amplitude'? Is this what
> is called resonance on
> > other filters? And if so, does the 291e self
> oscillate?
> > - What are the frequency ranges of the filter? The
> frequency pot has a
> > max value of 4k but the bandwidth pot has a max value
> of 100 which I
> > don't understand.
> > - I would also be interested in hearing opinions about
> the 291e. Is it
> > an essential module for a small 200e configuration? It
> seems so
> > powerful and unique.
> >
> > thank you for your help!
> >
> > Jorg
> >
> >  
> >
> 
> 
> [Non-text portions of this message have been removed]