Doepfer A-130/A-131 VCA (linear / logarithmic) User Manual download pdf

doepfer System A - 100 VCA A-130 / A-131

1. Introduction

Modules A-130 (Linear VCA) and A-131 (Exp. VCA)

provide voltage-controlled amplification.

H This section of the manual applies equally to

the A-130 and A-131, because apart from the

one difference of their response curves, they

are otherwise identical.

For audio signals, you would normally use the exponen-

tial VCA (A-131), and for control voltages, the linear

VCA (A-130). It doesn’t always have to be that way,

though.

The amount of amplification the VCAs provide is deter-

mined by the voltage at the CV input, and the position

of the gain control, which sets the overall gain in the

system.

The VCA has two audio inputs, each with an attenua-

tor. They are amplified by an amount determined by the

combination of the gain and the two CV controls.

CV 1

Audio

In 1

CV 2

Audio

In 2

CV 2

Gain

A-130

VCA-LIN.

In 1

Audio Out

Out

1 2 3 4 5 6 7 8

Summary of Contents

Page 1 - VCA-LIN

doepfer System A - 100 VCA A-130 / A-13111. IntroductionModules A-130 (Linear VCA) and A-131 (Exp. VCA)provide voltage-controlled amplification.H

Page 2 - 2. VCA - overview

A-130 / A-131 VCA System A - 100 doepfer22. VCA - overviewControls:1 Gain: Overall gain control2 CV 2: CV attenuator for input "3 IN 1: Att

Page 3 - 3. Controls

doepfer System A - 100 VCA A-130 / A-13133. ControlsThe A-130 has a linear response: the amplification is indirect linear proportion to the control

Page 4 - Gain = 0

A-130 / A-131 VCA System A - 100 doepfer4H Note that if a control voltage is partially nega-tive (for instance an LFO modulating the VCA)you need t

Page 5 - 5. User examples

doepfer System A - 100 VCA A-130 / A-13154. In / Outputs! CV 1 • " CV 2Sockets ! and " are control voltage inputs, whosevoltag

Page 6 - VCA System A - 100 doepfer

A-130 / A-131 VCA System A - 100 doepfer6Amplitude modulationIn Fig. 5, an LFO is modulating an A-130 linear VCA(with Gain > 0), so that the ampl

Page 7 - VCA A-130 / A-131

doepfer System A - 100 VCA A-130 / A-1317Keyboard control of VCA (tracking)You can use the CV output from a keyboard to modu-late the VCA, and so ha

Page 8 - 6. Patch-Sheet

A-130 / A-131 VCA System A - 100 doepfer86. Patch-SheetThe following diagrams of the module can help yourecall your own Patches. They’re designed

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Doepfer A-130/A-131 VCA (linear / logarithmic) User Manual

Browse online or download User Manual for Audio Doepfer A-130/A-131 VCA (linear / logarithmic). Doepfer A-130/A-131 VCA (linear / logarithmic) User Manual

Summary of Contents

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