Doepfer A-119 External Input/Envelope Follower - Manual

doepfer System A - 100
Ext. Input / Envelope Follower
A-119
1
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.
In
Over-
Load
Gate
Out
Threshold
Gain
A-119
Ext. In.
Symm. In
Envelope
Out
Audio
Out