Doepfer A-143-2 Handleiding

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DOEPFERDOEPFERDOEPFERDOEPFER System A-100Quad ADSR A-143-2

1

Fig. 1: A-143-2 Controls, Inputs and Outputs

1. Introduction

Module A-143-2contains four independent ADSR-type

envelope generators. Each sub-unit has available the

controls Attack, , Decay Sustainand Release. The three-

position Rangeswitch 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.

Product specificaties