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System A-100
Quad ADSR A-143-2
1
Fig. 1: A-143-2 Controls, Inputs and Outputs
1. Introduction
Module
A-143-2
contains four independent ADSR-type
envelope generators. Each sub-unit has available the
controls
Attack
,
Decay
,
Sustain
and
Release
. The three-
position
Range
switch allows selection of the desired time
range (low - high - medium). The adjustable envelope time
ranges from several minutes to less than 100 microseconds.
On top of this each unit is equipped with three digital outputs
(high/low): "
End of Attack
(EOA)", "
End of Decay
(EOD)"
and "
End of Release
(EOR)". As soon as the criterion is
valid (e.g. end of decay state) the corresponding digital
outputs turns "high". These outputs can be used e.g. to
daisy-chain several ADSR units. For this the digital output in
question (EOA, EOD or EOR) has to be connected to the
Gate input of the following ADSR. Even automatically
running envelopes (pseudo LFOs) or so-called "quadrature
envelopes" with cyclical modulations of several ring-shaped,
daisy-chained ADSRs are possible.
In addition to the obligatory
Gate
(G) input for envelope
generators each unit has available a
Retrigger
(Rt) input.
The retrigger turns the direction to "upward" if the envelope
has already reached the decay state while the retrigger
pulse occurs. The Gate inputs 2, 3 and 4 are normalled to
Gate input 1, i.e. the Gate input 1 is connected to the
switching contacts of the other inputs. Thus only one Gate
signal at Gate input 1 can be used to trigger all four units
simultaneously.
The envelope outputs are displayed with LEDs.
