200e

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

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]

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]

yes... so it's hard to do unintentionally...

On Tue, May 13, 2008 at 3:09 PM, don hassler <dlh30039@yahoo.com> wrote:

>   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<ezra.buchla%40gmail.com>>
> wrote:
>
> > From: ezra buchla <ezra.buchla@gmail.com <ezra.buchla%40gmail.com>>
> > Subject: Re: [200e] Some questions about the 291e
> > To: 200e@yahoogroups.com <200e%40yahoogroups.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 <jjsynth%40yahoo.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]
>
>  
>


[Non-text portions of this message have been removed]