Doepfer A-106 Manual

Doepfer Ikke kategoriseret A-106

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DOEPFERDOEPFERDOEPFERDOEPFER System A-100 X-treme Filter A-106-1

Fig. 1: A-106-1 Controls and In/Outputs

1. Introduction

Module A-106-1 is an unique low/high pass filter and has it's

origin in our experiments to built a MS20 filter clone. In

contrast to other filter designs it has different audio inputs

for low and high pass, but only one audio output. The type

of filter (12dB low pass, 6dB high pass or any mix) is

defined by the shares of the audio signal fed to the

corresponding inputs. Even two different audio signals can

be used as low and high pass input. A special feature is the

polarizer at the high pass input that allows to add/subtract

the high pass to/from the low pass share, leading to pseudo

band pass and notch responses (details concerning pseudo

in the next chapter).

Another special feature are the clipping controls, which

allow independent adjustment of the positive and negative

clipping level. The resonance goes up to self-oscillation, but

with a clearly different behaviour than on other filters. At

certain resonance and clipping settings the self-oscillation

generates rectangle or short sawtooth shaped pulses.

In general the A-106-1 is a very strange and awesome filter

and far away from being perfect (e.g non-linear control

scale, self-oscillation with all sorts of waveforms except

sine, a lot of roaring, rattling, noise or other unpredictable

sounds at high distortion and resonance settings, high

distortion or audio level overrides the resonance, significant

CV feedthrough …). But the A-106-1 has a lot of character –

probably much more than any other filter of the A-100 – and

is able to generate filter sweeps which are not possible with

any other filter.

X-treme Filter A-106-1 System A-100 DOEPFERDOEPFERDOEPFERDOEPFER

2. Basic Principles

As mentioned in the introduction, module A-106-1 has it's

origin in our experiments to built a MS20 filter clone. The

famous original MS20 included two filters: a 12 dB low pass

and a 6dB high pass filter connected in series, both with a

very special design.

Remark: The MS20 high pass if very often described as

12dB high pass, but this is not true.

During our research we found a way to use the same circuit

simultaneously as low pass and high pass for 2 different

audio signals (a bit similar to the A-101-1 Steiner Vactrol

filter, which also has different audio inputs available, but

with the special MS20 circuit). For this two separate audio

inputs for low pass (LP) and high pass (HP) with separate

level controls are available. The sockets are normalled, i.e.

the signal applied to the LP input is available for the HP

input too, provided that no plug is inserted into the HP input

socket. The level control of the HP input is realized as a

polarizer. This means that the signal can be added with the

same polarity (+ range) or opposite polarity (- range)

compared to the LP input. This feature enables pseudo

notch (+) and pseudo band pass (-) filter functions too. From

our point of view this is the most flexible solution as it

enables these functions:

• Low pass: the audio signal is fed to the LP input, HP

level control is set to zero, LP level control is set to the

desired level

• High pass: the audio signal is fed to the LP or HP input,

LP level control is set to zero, HP level control is set to

the desired level (in this special case it does not matter

if positive or negative amplification is chosen with the

polarizer control)

• Low pass / high pass mix with one audio signal: the

audio signal is fed to the LP input, LP and HP level

controls are set to the desired levels.

o special setting 1: if the level controls for LP and HP

are set in a way that both levels are identical with

the same polarity (i.e. + range of the HP level

control) and no or little distortion only one obtains a

pseudo notch filter (pseudo means that the notch is

far away from being perfect, the attenuation in the

pass band is not as good as for other filters of the

A-100 system, please refer to the frequency

response curves for details)

o special setting 2: if the level controls for LP and HP

are set in a way that both levels are identical with

the opposite polarity (i.e. - range of the HP level

control) and no or little distortion only, one obtains a

pseudo pseudo band pass filter ( means that even

the band pass is far away from being perfect, there

is a significant feedthrough of frequencies below

and above the center frequency, please refer to the

frequency response curves for details)

Produkt Specifikationer

Mærke:	Doepfer
Kategori:	Ikke kategoriseret
Model:	A-106

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