DOEPFER A-100 Series User Manual

A-123
VCF 4
System A - 100
doepfer
4
At close to maximum resonance, the filter starts to
self-oscillate, and behaves like a sine wave oscilla-
tor. Thanks to this effect, you can use the filter as an
independent tone source.
Fig. 2: How resonance affects the behaviour of a
high pass filter.
4. In / Outputs
! Audio In
This is the filter’s audio input socket, where you
patch in the output from any sound source.
" FCV 1
Socket FCV 1 is a voltage control input for the filter.
It works on the 1V / octave rule, like the VCOs.
If you connect the output of a modulation source (eg
LFO, ADSR) to this input, the cut-off frequency of the
filter will be modulated by its voltage: ie, the sound
color changes according to the voltage put out by the
modulator.
P If you use this VCF as a sine wave oscillator,
connect a pitch control voltage to this input.
Do the same if you want the filter’s cut-off
frequency to track exactly with the pitch of a
note.
§
FCV 2
Socket
§
is also a voltage-control input for the filter.
Unlike on socket
"
, though, you can adjust the level of
voltage by using the attenuator
3
, and thus control the
intensity of modulation effect on the filter.
f
c
Resonanz
Frequenz
0 db

DOEPFER A-100 Series Specifications

General

Type	Modular Synthesizer System
Manufacturer	Doepfer Musikelektronik GmbH
Power Supply	External Power Supply
Current Consumption	Depends on modules installed
Dimensions	Varies by case size
Number of Slots	Varies by case size
Width	Varies by case size