Doepfer A-103 Handleiding

Doepfer Niet gecategoriseerd A-103

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doepfer System A - 100 18dB Low Pass A-103

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. 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

18 d LB OW PASS

010

0 10

Aud o ui O t

doepfer System A - 100 18dB Low Pass A-103

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

Product specificaties

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

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