Doepfer A-123 24dB High Pass (no longer available) Manuel d'utilisateur

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doepfer
System A - 100
VCF 4 A-123
1
1. Introduction
Module A-123 (VCF 4) is a voltage-controlled high-
pass filter
, which filters out the lower parts of the
sound spectrum, and lets higher 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). Two CV inputs are available.
The cut-off slope is -24 dB/octave. The circuitry uses
a Curtis CEM 3320 chip.
Voltage controlled resonance: on the VCF 4, reso-
nance 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.
FCV 1
Resonance
FCV 2
QCV
Audio
In
Level
Audio
Out
QCV
Frequency
A-123
VCF 4
FCV 2
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Résumé du contenu

Page 1 - 1. Introduction

doepferSystem A - 100VCF 4 A-12311. IntroductionModule A-123 (VCF 4) is a voltage-controlled high-pass filter, which filters out the lower parts of

Page 2 - A-123

A-123 VCF 4System A - 100doepfer22. VCF 4 - OverviewControls:1 Lev. : Attenuator for audio input !2 Frq. : Cut-off frequency control3 FCV : Atte

Page 3 - 3. Controls

doepferSystem A - 100VCF 4 A-12333. Controls1 Lev.Use this attenuator to control the amount of signalentering the filter input $.H If the filter’s

Page 4 - Frequenz

A-123 VCF 4System A - 100doepfer4At close to maximum resonance, the filter starts toself-oscillate, and behaves like a sine wave oscilla-tor. Than

Page 5 - 5. User examples

doepferSystem A - 100VCF 4 A-1235$ QCVThis socket is the voltage control input for the filter’sresonance.If you patch a modulation source (eg LFO, A

Page 6

A-123 VCF 4System A - 100doepfer624 dB notch filter with voltage control ofmiddle frequency and bandwidthThe patch in Fig. 3 shows a 24 dB notch fil

Page 7

doepferSystem A - 100VCF 4 A-1237H To create a 24 dB bandpass filter withvoltage-controlled middle frequency andbandwidth, put both filters in serie

Page 8

A-123 VCF 4System A - 100doepfer86. Patch-SheetThe following diagrams of the module can helpyou recall your own Patches. They’re designed sothat a

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