Doepfer A-119 External Input/Envelope Follower User Manual download pdf

doepfer

System A - 100

Ext. Input / Envelope Follower

A-119

1. Introduction

Module A-119 (External Input / Envelope Follower)

is designed to allow external audio signals to be

integrated into the System A-100. It comprises a pre-

amp, envelope follower, and comparator.

The pre-amp has two inputs: an unbalanced input for

line level signals, with a gain factor of from 0 to 20, and

a balanced input with a gain factor of from 0 to 500,

for insertion of low level signals, for instance from a

microphone or electric guitar.

The Envelope Follower reads the signal level of the

input, and puts out a proportional voltage as an enve-

lope at its own output (see chapter 3. How it works).

The comparator generates a gate signal whenever the

input goes above an adjustable trigger threshold (see

chapter 3. How it works).

Three LEDs help you keep track of overload, the

envelope, and the gate signal.

Asym.

Over-

Load

Gate

Out

Threshold

Gain

A-119

Ext. In.

Symm. In

Envelope

Out

Audio

Out

1 2 3 4 5 6 7 8

Summary of Contents

Page 1 - Ext. In

doepferSystem A - 100Ext. Input / Envelope Follower A-11911. IntroductionModule A-119 (External Input / Envelope Follower)is designed to allow exte

Page 2 - A-119

A-119 Ext. Input / Envelope FollowerSystem A - 100doepfer22. A-119 - OverviewControls and indicators:1 Gain : Control for input signal level2 Ov

Page 3 - System A - 100

doepferSystem A - 100Ext. Input / Envelope Follower A-11933. The Envelope Follower: how it worksThe external audio signal (see Fig. 1a) is patched

Page 4 - 5. In / Outputs

A-119 Ext. Input / Envelope FollowerSystem A - 100doepfer4As soon as the envelope amplitude exceeds the trig-ger threshold T, the gate signal is out

Page 5 - Gate Out

doepferSystem A - 100Ext. Input / Envelope Follower A-1195§ Audio Out • $ Audio OutThe external audio signal, amplified by an amount setby

Page 6 - Ring modulator squelch patch

A-119 Ext. Input / Envelope FollowerSystem A - 100doepfer6Ring modulator squelch patchA ring modulator works particularly well with externalaudio s

Page 7 - "Singing synth"

doepferSystem A - 100Ext. Input / Envelope Follower A-1197“Ducking”, using an external signalIn the patch in Fig. 4 the amplitude of an external aud

Page 8

A-119 Ext. Input / Envelope FollowerSystem A - 100doepfer8

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Doepfer A-119 External Input/Envelope Follower User Manual

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