Doepfer A-101-3 Bruksanvisning
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A-101-3
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doepfer System A - 100 Modular Vactrol Phaser A-101-3
1
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.
Produktspecifikationer
| Varumärke: | Doepfer |
| Kategori: | Inte kategoriserad |
| Modell: | A-101-3 |
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