Doepfer A-142 User Manual
doepfer
CV
A-142
Volt. Contr. Decay/Gate
Trig. In
CV
Decay
System A - 100
1. Introduction
Module A-142 (VCD) is a dedicated envelope gene-
with just one parameter,
rator
time is either controlled manually or by voltage control.
Whenever a trigger arrives at the VCD's trigger input,
an envelope is generated. This can then be used to
control VCO, VCF and VCA modules, or any other
module, come to that.
In addition to this, the module produces a gate signal
of adjustable length, which can be output in inverted as
well as normal polarity.
Voltage Contr. Decay / Gate
decay time.
A-142
This decay
Env. Out
Gate Out
Inverse
Gate Out
Threshold
Two
LEDs
signals.
act as indicators of the envelope and gate
1
A-142
Voltage Contr. Decay / Gate
System A - 100
doepfer
2. Overview
A-142
Volt. Contr. Decay / Gate
Trig. In
CV
Env. Out
Gate Out
Inverse
Gate Out
VCD
0
0
Gate
0
Threshold
Decay
10
CV
10
10
➀
➁
➂
➃
➄
Indicators and controls:
Decay : Manual control for altering the decay
1
time.
: Attenuator for control voltages at CV
CV
2
input
"
3 LED : Indicator for the envelope at output §
LED : Indicator for the gate signal at output
4
$
Threshold
5
: Control to set the trigger threshold,
and thus the length of gate signal
output.
In- / Outputs:
! Trig. In : Input for the trigger signal
: Control voltage input
CV
"
Env. Out : Envelope output
§
$ Gate Out : Output for the gate signal generated
Inv. Gate Out: ditto, except inverted
%
2
doepfer
System A - 100
Voltage Contr. Decay / Gate
A-142
3. Controls and indicators
Decay
1
This is used for manual control of the decay time tD of
the envelope generated. After an extremely short attack phase, the envelope runs from maximum to zero
in the time that has been set by this control (see fig. 1).
2 CV
Attenuator 2 is used to set the level of the control
voltage
present at CV input
the length of the decay.
3 LED
LED 3 shows the
sent to output §.
voltage level
4 LED
LED 4 is the indicator for the gate signal at output $.
5 Threshold
Control 5 is used for setting the threshold which
determines the
works like this: the gate signal t
when a trigger is sensed, and stops whenever the
envelope voltage falls below the threshold level, which
you set with control 5 (see fig 1).
length of the gate signal
which in turn controls
",
of the
envelope
produced.It
at output $ starts
G
being
Trig In
0 V
Env Out
Threshold
0 V
Gate Out
0 V
Inv. Gate Out
0 V
t
G
t
D
fig. 1: How the A-142 responds to a trigger
Simultaneously, at output % , an
inverted gate signal
is available.
3
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