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

> From: "Dieter Doepfer" < hardware@... >
> To: "Bakis Sirros" < synth_freak_2000@... >
> Subject: AW: 1 some notes about the new
> doepfer stuff
> Date: Wed, 22 Sep 2004 10:13:24 +0200
>
> > a101/2 lowpass gate
> > -------------------
> > what a nice module. especially the filter mode and
> the
> > combined filter+vca mode sounds great. it has such
> > a smooth, soothing organic quality and the
> resonance
> > control allows nice coloring of the signal. this
> is a
> > great feature unavailable in the original buchla
> design.
> > in vca mode there is always a bit of a signal
> feedthrough,
> > which is not noticable in the other two modes.
>
> In VCA mode the vactrols (connected in series) form
> a simple voltage divider
> in combination with a fixed resistor (10k) to GND.
> To obtain zero level
> (theoretically) infinite resistance for the vactrols
> would be required. But
> as the max. value is limited to 1M for each vactrol
> (1M fixed resistor in
> parallel to each vactrol) in our circuit the max.
> attenuation is 15k/(1M+1M)
> = 0.0075. This is the max. attenuation of the
> A-101-2 in VCA mode and this
> is probably the feedthrough that you still hear. If
> the fixed 1M resistors
> are removed a higher attenuation will be possible.
> Maybe we will omit them
> in the next series. But we have to check if this has
> no negative effects to
> the other modes (VCF and VCF+VCA).
>
> 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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