Doepfer A-171 User Manual
doepfer
CV 2
CV 1
CV 2
In
In
Out
A-171
VC SL
Rate
-
Control
+
System A - 100
1. Introduction
Module A-171 is a voltage controlled slew limiter,
otherwise known as a
grator.
Whenever there is an abrupt transition in the voltage
present at the input, the Slew Limiter works as an
integrator
signal - so that abrupt transitions are sloped. The
speed of the transition is governed by the rate control.
As well as manual setting of this slope, the A-171 also
gives you the possibility of voltage control of the
slope’s gradient by patching in an appropriate voltage to two CV inputs, one of which has an attenuator
for level adjustment.
Two LEDs serve as status indicators to show the
relative amounts of positive and negative signals at the
output.
VC Slew Limiter
portamento controller
, slowing down the transitions in the output
A-171
or
inte-
1
A-171
VC Slew Limiter
System A - 100
doepfer
2. Overview
CV 1
CV 2
Sign. In
Out
VCSL
VC SLEW LIMITER
Rate
10
0
CV 2
10
0
-
+
Control
➀
➁
➂
Controls and indicators:
Rate : control governing the transition speed
1
of the modified signal
: attenuator for control voltages at
CV 2
2
LEDs : status indicators for voltages at
3
output %
In / Outputs:
CV 1 : input for voltages to control transition
!
speed
"
§ Sign. In : signal input
$
%
: ditto, but with level controlled by
CV 2
Sign. In
Out
: ditto, interconnected with § (and so a
: output
attenuator
"mini multiple")
2
"
2
doepfer
System A - 100
VC Slew Limiter
A-171
3. Controls and indicators
1 Rate
With this control you adjust the transition speed of the
slope created by the slew limiter (see Fig. 1). The
speed can be adjusted to produce transitions from
about 10 down to nearly 0 seconds.
Out
αααα αααα
In
t
S
t
S
Fig. 1: How the A-171 transforms a signal.
When Rate = 10, the output signal is nearly identical
to the input, i.e. the max. slew speed or min. slew time
is selected. When Rate = 0 one obtains the minimum
slew speed (= maximum slew time, i.e. ~ 10 seconds).
Out
In
t
S
t
S
Pay attention that the control behaviour of the
H
A-171 is reverse that of the "normal" slew limiter A-170. The control of A-171 is controls the
speed (rate), the controls of the A-170 control
the time.
2 CV 2
Use Attenuator 2 to control the amount of CV input
to affect the transient speed.
"
3 LEDs
The LEDs 3 are status indicators of the relative mix
of positive ("+") and negative ("-") signals at the output.
The brighter they are, the higher the voltage.
3
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