Doepfer A-127 Bedienungsanleitung


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doepfer System A - 100 Triple VC Resonance Filter A-127
1
1. Introduction
Module A-127 is a Voltage-Controlled Triple Reso-
nance Filter), consisting of three separate band pass
filters with one common input.
For each of the filters, the filter frequency and Reso-
nance can be manually controlled, and in addition
the filter frequency can be voltage controlled. Each
filter has its own audio output. There is also a Mix
output which takes your chosen amounts of each of
the three filter outputs and the original signal - set by
the Audio Level controls - and outputs them from one
socket.
Each of the filters also has an internal LFO (a triangle
waveform) for modulating the filter, and there are
controls for LFO frequency and amplitude. Instead of
the LFO, an external control voltage can be used,
whose amplitude can be manually controlled.
H There is an alternative scenario:- each of the
three filters can also be configured as a
12dB low-pass filter with resonance con-
trol. To do this, a jumper has to be re-
positioned on each of the three circuit boards
(see chapter 7, Appendix).
A-127
VCRF
Mix Out
ext. CV
Audio
In
Audio Lev.
Resonance
VCF Frq.
CV Ampl.
LFO Frq.
VCF 1
Audio
Out
Audio
In Level
Original
VCF 2 VCF 3
A-127 Triple VC Resonance Filter System A - 100 doepfer
2
A-127 VCRF
Triple Voltage Controlled Resonance Filter
LFO Frq.
Audio
In
0 10
010
010
0 10
0 10
010
010
0 10
010
010
0 10
010
010
0 10
010
010
0 10
CV Ampl. VCF Frq. Resonance Audio Level Audio
Out
VCF 1
VCF 2
VCF 3
Mix
1
2
3
Audio In
Level
Original
LFO
F ext. CV OutF Q
2 same circuit
1 same circuit
3
Out In
A L
L
L
VCF
M
I
X
 
➂ ➄ ➅
➀ ➇
ext. CV
2. VCRF - Overview
doepfer System A - 100 Triple VC Resonance Filter A-127
3
Controls:
1 A. In Level : Input signal attenuator
per VCF:
2 LFO Frq. : LFO frequency control
3 CV Ampl. : Attenuator for external CV and/or
LFO amplitude
4 LED : LFO and/or external CV indicator
5 VCF Frq. : Filter frequency control
6 Resonance : Filter resonance control
7 Audio Level : Level control for audio output
amplitude of the filter (*)
8 Original : Control for setting the amount of
the original signal present at the
Mix output $
(*) For modules manufactured until end of 1998 control
7 affects both the individual outputs § and the mix
output $. For modules manufactured 1999 and later
control 7 affects only the mix output $, but not the
single outputs §.
In- / Outputs:
! Audio In : Input to the filter
per VCF:
" ext. CV : Filter frequency CV input
§ Audio Out : Filter output
$ Mix Out : Mix output


Produktspezifikationen

Marke: Doepfer
Kategorie: Nicht kategorisiert
Modell: A-127

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