Doepfer

yes, i think so. but the question is, what is most responsible
for the "organic quality"? is it really the discrete triangle core?
i'd really love to hear a pure 259 in action, but who has one?

best wishes

ingo


--- In Doepfer_a100@yahoogroups.com, "levka0" <levka@w...> wrote:
> So the "organic quality" of a possible 259 expander depends also on 
> any (im)perfections of the triangle source that goes in ?
> 
> regards
> Joost
> 
> --- In Doepfer_a100@yahoogroups.com, Bakis Sirros 
> <synth_freak_2000@y...> wrote:
> > 
> > --- Dieter Doepfer <hardware@d...> wrote:
> > 
> > > From: "Dieter Doepfer" <hardware@d...>
> > > To: "Bakis Sirros" <synth_freak_2000@y...>
> > > Subject: AW: [Doepfer_a100] Re: New poll for
> > > Doepfer_a100
> > > Date: Fri, 6 Aug 2004 12:48:48 +0200
> > > 
> > > > -----Ursprüngliche Nachricht-----
> > > > Von: Bakis Sirros
> > > [mailto:synth_freak_2000@y...]
> > > > Gesendet: Donnerstag, 5. August 2004 21:01
> > > > An: Doepfer_a100@yahoogroups.com
> > > > Betreff: Re: [Doepfer_a100] Re: New poll for
> > > Doepfer_a100
> > > >
> > > >
> > > > hello psm,
> > > > i don't know that yet.but,i guess that you'll have
> > > to
> > > > only connect the triangle output of the a111 to
> > > the
> > > > expander module via a normal patchcable.dieter?
> > > 
> > > right. Probably only a patch from triangle out to
> > > the waveshaper module.
> > > 
> > > The suggested "A-111 expansion module" will of
> > > course not only work with the
> > > A-111 but with every VCO that has triangle waveform
> > > available.
> > > 
> > > The main difference - as mentioned earlier by other
> > > members - between the
> > > Buchla design and other VCOs is the triangle core,
> > > i.e. the basic waveform
> > > from which all other waveforms are derived is
> > > triangle - in contrast e.g. to
> > > the Moog VCOs, SSM2033 or A-110 for which sawtooth
> > > is the basic waveform.
> > > For triangle VCOs normally a bipolar current source
> > > (so-called Wilson
> > > current mirror) is used in contrast to unipolar
> > > current sources for sawtooth
> > > VCOs. The CEM3340 also uses triangle as basic
> > > waveform. So from my (so far
> > > theoretical) point of view using a CEM3340 based VCO
> > > will have no
> > > disadvantages compared to the original Buchla VCO
> > > core as the tracking of
> > > the A-111 is much better. Maybe there are details I
> > > have overlooked but I
> > > don't think so.
> > > 
> > > Waveforms derived by waveshaping circuits from
> > > triangle resp. sawtooth will
> > > sound a bit different. One of the "problems" with
> > > sawtooth as basic waveform
> > > is that the saw reset is not immediately but takes a
> > > few microseconds as a
> > > capacitor has to be discharged. Consequently all
> > > waveforms derived from saw
> > > will have a short spike at the reset position of the
> > > saw. For waveforms
> > > derived from triangle this peculiarity does not
> > > appear as only the
> > > charge/discharge direction at the bottom/top of the
> > > wave has to be changed
> > > and consequently the spikes mentioned above do not
> > > occur.
> > > 
> > > But the VCO core and the waveshapers are two
> > > different sub-modules. So why
> > > not combine the Buchla waveshaper with triangle or
> > > sawtooth based VCOs. This
> > > is why I advocate for a separate Buchla type
> > > waveshaping unit as it probably
> > > could be combined with any VCO that has a triangle
> > > output available. If a
> > > triangle based VCO is used (e.g. A-111 or any other
> > > CEM3340 based VCO) the
> > > sound should be very close to the Buchla VCO from my
> > > point of view.
> > > 
> > > Best wishes
> > > Dieter Doepfer
> > > 
> > > 
> > > 
> > 
> > 
> > =====
> > Bakis Siros
> > Parallel Worlds / Polariton
> > Athens-Greece
> > [Doepfer_a100] group owner
> > http://www.shimarecords.co.uk
> > http://www.ward12.com
> > 
> > 
> > 	
> > 		
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