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System A - 100

Dual Low Cost VCA A-132

1. Introduction

Module A-132 (Dual Low Cost VCA) contains two

voltage controlled amplifiers

, with a linear response

most suited to regulating the level of control voltages

(ADSR amount, level of vibrato effect, etc.).

In non-critical situations, though, its VCAs can be used

to control audio signals - see chapter 4, user exam-

ples.

Amplification is governed by the sum of the voltages

patched into the two CV inputs.

CV 1

A-132

DUAL VCA

CV 2

Sig.

Out

CV 1

CV 2

Sig.

Out

Summary of content (6 pages)

PAGE 1
System A - 100 doepfer Dual Low Cost VCA A-132 1. Introduction A-132 DUAL VCA CV 1 CV 2 Sig. In Sig. Out Module A-132 (Dual Low Cost VCA) contains two voltage controlled amplifiers, with a linear response most suited to regulating the level of control voltages (ADSR amount, level of vibrato effect, etc.). In non-critical situations, though, its VCAs can be used to control audio signals - see chapter 4, user examples. Amplification is governed by the sum of the voltages patched into the two CV inputs.
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A-132 Dual Low Cost VCA System A - 100 2. Dual Low Cost VCA - Overview A-132 DUAL VCA CV 1 CV 2 Sig. In Sig. Out CV 1 CV 2 Sig. In Sig. Out 2 doepfer In / Outputs: ! CV 1 : Input 1 for amplification CV " CV 2 : Input 2 for amplification CV § Sig. In : Amplifier input $ Sig.
PAGE 3
System A - 100 doepfer Dual Low Cost VCA A-132 3. In / Outputs 4. User examples ! CV 1 Control of modulation amount by AM • " CV 2 Sockets ! and " are the VCA’s control voltage inputs. Whatever voltages are patched in here are summed, and determine the amount of amplification in the VCA (0 V: zero amplification; 5 V: maximum amplification). In Fig. 1 an A-132 is added to the patch to make the amount of modulation voltage-controlled.
PAGE 4
A-132 Dual Low Cost VCA System A - 100 MIDI-controlled VCF or VCA envelope amount One important use of the A-132 is to control a VCF or VCA envelope according to how much velocity CV a MIDI-CV interface is putting out, as in Fig. 2. MIDIInterface AudioSignal Velocity CV VCF / VCA Gate ADSR Fig. 2: A-132 Controlling the level of a VCF or VCA envelope by the velocity CV output from a MIDI interface.
PAGE 5
doepfer System A - 100 Dual Low Cost VCA A-132 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. Make multiple copies of your composite diagram, and use them for remembering good patches and set-ups.
PAGE 6
A-132 Dual Low Cost VCA 6 System A - 100 doepfer