DOEPFER Quad AD/LFO A-143-1 Handbuch

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System A-100

Quad AD/LFO A-143-1

DOEPFER

1. Introduction

Module A-143-1 contains four independent Attack/Decay

generators. When the module is used as a complex

envelope generator, then two, three or four units are daisy-

chained, i.e. the preceding unit triggers the following unit.

But the four units can be used even as four separate AD

generators (mode switch in position AD) or free-running AD-

type LFOs (mode switch in position LFO). The LFO mode

differs in several points from a regular LFO (e.g. A-145, A-

146 or A-147), as the slopes are exponential - in contrast to

linear slopes of a normal LFO. In addition the frequency is

defined by both controls, as the attack control defines the

duration of the rising slope, while the decay control defines

the duration of the falling slope.

Each unit has available a comparator that compares the AD

output voltage against a manually adjustable threshold and

turns on the corresponding comparator output as soon as

the AD output voltage goes below the threshold level during

the decay phase. The comparator outputs are normalled to

the trigger inputs of the following stage via the switching

contacts of the trigger input sockets. Consequently the first

unit triggers the second, the second triggers the third and so

on (and the last unit triggers the first one).

Each AD/LFO unit also offers a polarizer control. This allows

adding or subtracting all AD/LFO signals to the mix output

with adjustable level. Additionally each unit features a single

envelope output and a digital "End Of Attack (EOA)" output,

that indicates the end of the attack phase.

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