Doepfer A-105 Bedienungsanleitung


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doepfer System A - 100 A-105 / A-122
1
1. Introduction
The modules A-105 and A-122 are voltage-
controlled low-pass filters, which filter out the higher
parts of the sound spectrum, and lets lower frequen-
cies pass through.
The cut-off frequency determines the point at which
filtering takes effect. You can control this manually, or
by voltage control (filter modulation, for instance by
an LFO). Two CV inputs are available. The cut-off
slope is -24 dB/octave.
Voltage controlled resonance: for both A-105 and
A-122, resonance can be controlled not just manually,
but by voltages as well, right up to self-oscillation. In
this case, the filter behaves like a sine wave oscillator.
The A-105 is based on the special circuit SSM2044,
that was used in several devices of the companies
Korg (Polysix, Mono-Poly), Sequential Circuits
(Prophets, Pro-One), PPG, Fairlight, Emu and Kawai.
The circuitry of the A-122 uses a Curtis CEM 3320
chip, and is very similar to the classic Oberheim filter
sound. Because of the different circuits the A-105 and
A-122 have considerably different sounds and even
sound different compared to the other filters (e.g.
A-120 Moog-type low pass, A-102 Diode Low Pass or
A-103 18dB low pass, A-124 Wasp filter).
As the functions and controls are the same for both
modules they are a combined in one manual.
FCV 1
Resonance
FCV 2
QCV
Audio
In
Level
Audio
Out
QCV
Frequency
A-122
VCF 3
FCV 2
A-105 / A-122 System A - 100 doepfer
2
2. VCF 3 - Overview Controls:
1 Lev. : Attenuator for audio input !
2 Frq. : Cut-off frequency control
3 § FCV : Attenuator for filter CV at input
4 QCV : Attenuator for resonance CV at input
$
5 Res.: Control for setting the filter’s reso-
nance (emphasis)
In / Outputs:
! Audio In : Input to the filter
" FCV 1 : Input for voltage control of the filter
cut-off frequency (1 V /octave)
§ FCV 2 : ditto, level controlled by 3
$ QCV : Input for voltage control of the filter’s
resonance; level controlled by 4
% Audio Out : Output from the filter
A-122
VCF 3
FCV 1
FCV 2
QCV
Frq.
FCV
QCV
Res.
Lev.
Audio In
24 dB Low Pass II
0 10
010
010
0 10
0 10
Audio Out


Produktspezifikationen

Marke: Doepfer
Kategorie: Nicht kategorisiert
Modell: A-105

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