--- Dieter Doepfer < hardware@... > wrote:

> From: "Dieter Doepfer" < hardware@... >
> To: "Bakis Sirros" < synth_freak_2000@... >
> Subject: AW: 1 Re: New poll for
> Doepfer_a100
> Date: Fri, 6 Aug 2004 12:48:48 +0200
>
> > -----Urspr�ngliche Nachricht-----
> > Von: Bakis Sirros
> [mailto: synth_freak_2000@... ]
> > Gesendet: Donnerstag, 5. August 2004 21:01
> > An: Doepfer_a100@yahoogroups.com
> > Betreff: Re: 1 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
1 group owner
http://www.shimarecords.co.uk
http://www.ward12.com




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