Doepfer A-101-3 Handleiding

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doepfer System A - 100Modular Vactrol Phaser A-101-3

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1. Introduction

Module A-101-3 is a 12 stage phase shifter with vac-

trols as phase shifting elements. A vactrol is a combina-

tion of a light depending resistor (LDR) and LEDboth

put into a light-proof case. They are known for their

smooth soundbehaviour as vactrols are distortion-free

linear elements in contrast to any semiconductor (like

transistors or OTA in other designs). For more general

details about vactrols please look at the vactrol basics

page on our web site www.doepfer.com.

In contrast to other phaser designs the A-101-3 is much

more flexible and offering a lot of new features not

available from other phasers on the market. The A-101-

3 offers access to each of the 12 input and output

stages leading to a lot of new filters that cannot be

obtained in other ways. Especially the free patchable

feedback loops (yes, not only one feedback loop is

possible) between each of the 12 stages, the separate

phase shift controlfor the stages 1-6and 7-12, and

the 2 polarizersintended to control the feedback loops

lead to completely new filter types(a polarizer is a

circuit that is able to generate positive and negative

amplifications in the range -1...0...+1 with -1 = inversion,

0 = full attenuation, +1 = unchanged signal, for details

concerning the polarizer function please look at the

A-133 VC Polarizer or A-138c Polarizing Mixer module).

On our web siteare lot of frequency response curves

availabe that show which filter types can be realized.

Internally the module is made of 2 independent 6 stage

phase shiftersseparate audio(1-6 reps. 7-12) with

inputs(with attenuators), audio outputs (with mix con-

trol), and phase shift control units. The phase shift

control units feature both manual and voltage controlled

phase shifting (e.g. from a LFO, ADSR, Random Vol-

tage, Theremin CV, Foot Controller CV ...). For each

sub-module a phase shift display (LED) is available.

The LED shows the illumination state of the 6 vactrols of

the sub-module in question as it is connected in series

with the internal vactrol LEDs.

Eachof the 12 phase shift stagesis equipped with an

audio outputsocket and feedback inputsocket to

obtain full flexibility to create a multitude of different

filters. The audio input signal and the output signals of

stage 6resp. stage 12 are mixed with 2 manual controls

to obtain effects at two audio outputs(for normal

phase shifting effect this is 50% input signal and 50%

phase shifted signal).

The two submodules are internally connectedvia nor-

malled sockets so that cantwo 6 stage phase shifters

be obtained without external patches.

Product specificaties