Doepfer A-143-1 Manual

Doepfer Ikke kategoriseret A-143-1

Læs gratis den danske manual til Doepfer A-143-1 (8 sider) i kategorien Ikke kategoriseret. Denne vejledning er vurderet som hjælpsom af 15 personer og har en gennemsnitlig bedømmelse på 4.4 stjerner ud af 8 anmeldelser. Har du et spørgsmål om Doepfer A-143-1, eller vil du spørge andre brugere om produktet?

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Side 1/8

DOEPFERDOEPFERDOEPFERDOEPFER System A-100 Quad AD/LFO A-143-1

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

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.

Quad AD/LFO A-143-1 System A-100 DOEPFERDOEPFERDOEPFERDOEPFER

2. Basic Principles

Fig. 2 shows the basic function of each unit:

Fig. 2: Basic function

The positive edge of the trigger input starts the envelope

signal and resets the “End of Attack (EOA)” output. The time

for the rising slope of the envelope is defined by the Attack

control. As soon as the maximum value (about +8 V) is

reached, the EOA output is set to “high” and the decay state

begins. The time for the falling slope of the envelope is

defined by the Decay Control.

The threshold setting defines the behaviour of the

Comparator output (Cp Out). This output turns “low” as soon

as the level of the envelope signal exceeds the threshold

level. Otherwise it’s high.

Both digital outputs EOA and Cp Out can be used to trigger

other A-100 modules or other units of the A-143-1.

The retrigger behaviour of the A-143-1 is different compared

to other envelope generators. During the rising slope of the

envelope (attack phase) the envelope cannot be retriggered

or reset. And during the falling slope (decay phase) the

direction changes if a trigger signal appears (changes from

decay to attack state).

Fig. 3: Retrigger behaviour

Produkt Specifikationer

Mærke:	Doepfer
Kategori:	Ikke kategoriseret
Model:	A-143-1

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