Doepfer A-103 Handleiding

Doepfer Niet gecategoriseerd A-103

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doepfer System A - 100 18dB Low Pass A-103
1
1. Introduction
Module A-103 (VCF 6) is a voltage controlled low-
pass filter with a cut-off slope of -18dB/octave. It
filters out the higher parts of the sound spectrum and
lets lower frequencies 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). Three CV inputs are available, and the sum of
the voltages from these affects the filter cut-off.
Resonance (or Emphasis) is adjustable all the way up
to self-oscillation - in which case the filter behaves like
a sine wave oscillator.
A-103 uses a so-called transistor ladder with a slope
of 18 dB/Octave as frequency controlling element. It is
very similar to the transistor ladder of the A-120 (24dB
Moog type low pass) but the ladder of the A-103 is a
modification of the original Moog ladder and identical to
the ladder used in the Roland TB-303 (base and
collector of each transistor are connected).
CV 1
Re onans ce
CV 3
CV 2
Audio n I
Le ev l
Audio
Out
CV 2
Frequency
A-103
VCF 6
CV 3
A-103 18dB Low Pass System A - 100 doepfer
2
2. VCF 6 - Overview Controls:
1 Freq.: Cut-off frequency control
2 CV 2: Attenuator for CV at input "
3 CV 3: Attenuator for CV at input §
4 $ Lev.: Attenuator for audio input
5 Res.: Control for setting the filter’s reso-
nance (emphasis)
In / Outputs:
! CV 1: Control Voltage input
" CV 2: ditto, level controlled by 2
§ CV 3: ditto, level controlled by 3
$ Audio In: Audio input to the filter
% Audio Out: Audio output from the filter
A-103 VCF 6
CV 2
CV 3
Aud o ni I
CV 2
CV 3
Lev.
Res.
Frq.
CV 1
Ê
Ë
Ì
Í
Î
À
Á
Â
Ã
Ä
18 d LB OW PASS
010
010
0 10
0 10
0 10
Aud o ui O t
doepfer System A - 100 18dB Low Pass A-103
3
3. Controls
1 Frq.
With this control you adjust the Cut-Off Frequency fc,
above which the filter attenuates all frequencies. At 10,
the filter is fully open. The more you turn down this
control, the more the high frequencies are filtered. The
sound becomes mellower and less bright (see Fig. 1)
until at 0 the lter is completely shut, and there will be
no output signal at all.
2 CV 2 • 3 CV 3
For voltage control or modulation of the cut-off fre-
quency, use these CV inputs " and/or § (see Fig. 1).
Use attenuators 2 and/or 3 to adjust the control
voltage level.
4 Lev.
Use this attenuator to control the amount of signal
entering the filter input $.
H If the filter’s output distorts, turn this control
down, unless you deliberately want the sound
as a spe-
cial effect.
Fig. 1: Frequency response of the A-103
5 Res.
With this control you adjust the filter’s resonance
(emphasis, Q) - the parameter which emphasises the
frequencies around the cut-off point f C. Close to its
maximum setting, the filter becomes so resonant that it
goes into self-oscillation, and starts behaving like a sine
wave. You can take advantage of this effect, and use
the VCF as an additional oscillator.
Frq. / CV
Freq.
Res.
Out
fC

Product specificaties

Merk: Doepfer
Categorie: Niet gecategoriseerd
Model: A-103

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