Doepfer A-103 Handleiding

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doepfer System A - 10018dB Low PassA-103

1

1. Introduction

Module A-103 (VCF 6)is a voltage controlled low-

pass filterwith a cut-off slopeof -18dB/octave. It

filters out the higher parts of the sound spectrum and

lets lower frequencies pass through.

The Cut-Off Frequencydetermines 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 onansce

CV 3

CV 2

Audion I

Le evl

Audio

Out

CV 2

Frequency

A-103

VCF 6

CV 3

Product specificaties