Doepfer A-103 Manual

Doepfer Ikke kategoriseret A-103

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Side 1/6

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

Produkt Specifikationer

Mærke:	Doepfer
Kategori:	Ikke kategoriseret
Model:	A-103

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