Doepfer A-101-3 Handleiding

Doepfer Niet gecategoriseerd A-101-3

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

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 LED both

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

smooth sound behaviour 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 control for the stages 1-6 and 7-12, and

the 2 polarizers intended 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 site are 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 shifters separate 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.

Each of the 12 phase shift stages is equipped with an

audio output socket and feedback input socket to

obtain full flexibility to create a multitude of different

filters. The audio input signal and the output signals of

stage 6 resp. 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 connected via nor-

malled sockets so that cantwo 6 stage phase shifters

be obtained without external patches.

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

Fig.1: A-101-3 Overall view

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

2. Basic principles

The module is made of two identical units that differ

only in the normalling of the sockets (i.e. how the

switching contacts of some sockets are internally

pre-wired). Therefore only one of the two units is

described with reference to fig. 1 on the preceding

page. The stages 1-6 belong to the first unit, 7-12 to

the second one. Some basics concerning the function

of a phaser (frequency response, comb filter) can be

found in the manual of the VC phaser A-125 too.

The vactrol control unit is made of a logarithmic

voltage-to-current converter that converts the sum

of the manual phase shift setting and the external

control voltage into a current. This current is used to

drive the 6 LEDs inside the vactrols of the phase

shift stages and the display LED. The 6 photo resi-

stors inside the vactrols that work as phase shift

controlling elements respond to the illumination inten-

sity and create different phase shifts for different

illuminations.

The (attenuated) audio input signal is fed into the first

phase shift stage (stage 1). The 6 phase shift stages

are daisy-chained. Each stage is equipped with it's

own audio output (stage out) and feedback input.

The sum of the feedback input and the output of the

preceding stage are mixed and fed into the correspon-

ding phase shift stage.

This modular concept allows the realization of dif-

ferent phasers as well as a lot of other filters too as

all inputs and outputs are free patchable. For example

phasers with 2 up to 12 stages, phasers with free

eligible simple or multiple feedback loops or parallel

working phasers are possible. On our web site a lot of

frequency response curves are available that show

which types of phasers and filters are possible with

this modular concept.

The module contains two additional circuits: a mixer

and a (one for each unit).polarizer

The mixer is used to combine the incoming original

audio signal (audio In) with the phase shifted signal

(shifted audio In) with adjustable ratio. The typical

setting for a phaser is 50:50, i.e. both the original and

the shifted signal have the same level. This creates

the typical phaser jet sound that is based on the

comb-like frequency response curve. But even diffe-

rent ratios make sense. If only the phase shifted

signal is used one obtains the so-called phase vi-

brato effect. The socket "Shifted Audio In" is normal-

led to stage output 6. Consequently a 6-stage phaser

is obtained at the socket "Mixed Audio Out" provided

Product specificaties

Merk:	Doepfer
Categorie:	Niet gecategoriseerd
Model:	A-101-3

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