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doepfer

System A - 100

VC Slew Limiter

A-171

1. Introduction

Module A-171 is a voltage controlled slew limiter,

otherwise known as a

portamento controller

inte-

grator.

Whenever there is an abrupt transition in the voltage

present at the input, the Slew Limiter works as an

integrator

, slowing down the transitions in the output

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 vol-

tage 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.

CV 1

Rate

A-171

VC SL

CV 2

Out

Control

CV 2

Summary of content (8 pages)

PAGE 1
System A - 100 doepfer VC Slew Limiter A-171 1. Introduction CV 1 A-171 VC SL CV 2 CV 2 Rate In Whenever there is an abrupt transition in the voltage present at the input, the Slew Limiter works as an integrator, slowing down the transitions in the output signal - so that abrupt transitions are sloped. The speed of the transition is governed by the rate control.
PAGE 2
A-171 VC Slew Limiter System A - 100 Controls and indicators: 2. Overview VCSL VC SLEW LIMITER CV 1 Rate 1 Rate : control governing the transition speed of the modified signal 2 CV 2 : attenuator for control voltages at " 3 LEDs : status indicators output % ➀ for voltages at 10 0 CV 2 CV 2 ➁ 10 0 Sign. In Out - + Control 2 doepfer ➂ In / Outputs: ! CV 1 : input for voltages to control transition speed " CV 2 : ditto, but with level controlled by attenuator 2 § Sign.
PAGE 3
System A - 100 doepfer 3. Controls and indicators H Pay attention that the control behaviour of the 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 Out α 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.
PAGE 4
A-171 VC Slew Limiter System A - 100 doepfer 4. In / Outputs 5. User examples ! CV 1 Voltage controlled slew limiting in a MIDI system • " CV 2 The transition speed produced by the A-171 depends on a combination of the setting on the Rate control, and any voltages patched into the CV inputs ! and ". The level of the voltage at CV input " can be controlled by attenuator 2. § Sign. In • $ Sign. In These interconnected sockets are the signal input to the VC Slew Limiter.
PAGE 5
System A - 100 doepfer VC Slew Limiter A-171 Slew Limiter as VC AR generator You can also use the A-171 as a simple AR generator, for instance with the percussive sound in the example in Fig. 3. The attack/release parameters can be controlled by MIDI, for instance by the voltage at the CV2 output on the A-190. MIDI CV 1 A-171 MIDI In CV 1/2 A-190 CV 2 VCO Fig. 2: A-171 as real-time controlled portamento generator. CV 1 VCO VCF gliss. gliss.
PAGE 6
A-171 VC Slew Limiter System A - 100 Producing complex controllable modulations With a combination of a Clock Divider / Sequencer (A-160 / A-161) and a series of A-171 VC Slew Limiters, complex modulation systems are possible (see Fig. 4). The Clock Sequencer is patched into a series of Slew Limiters, each set to produce a different envelope. These envelopes are patched into an A-138 Mixer (the version with linear response) . The level of each of the envelopes is adjusted with the mixer.
PAGE 7
System A - 100 doepfer MIDI A-191 A-160 Clock Divider MIDI In A-161 Clock Sequencer 1 S90 /LFO Trig. In VC Slew Limiter A-171 A-138 a A-171 MIXER In 1 Input 1 In 2 2 Input 2 In 3 C1 3 4 C2 Input 3 A-171 Out In 4 Input 4 Output 5 6 7 8 Fig. 5: Producing complex controllable modulations.
PAGE 8
A-171 VC Slew Limiter System A - 100 doepfer 6. Patch-Sheet The following diagrams of the module can help you recall your own Patches. They’re designed so that a complete 19” rack of modules will fit onto an A4 sheet of paper. Photocopy this page, and cut out the pictures of this and your other modules. You can then stick them onto another piece of paper, and create a diagram of your own system.