A-105 24dB SSM Low Pass Filter
A-105 24dB SSM Low Pass Filter
A-105 24dB SSM Low Pass Filter

 

  • Type/ Filter
  • Width/ 8HP
  • Power/ +30mA/-30mA
  • Depth/ 45mm

 
Doepfer A-105 is a 24dB low pass filter based on the legendary SSM2044 chip. This chip was used e.g. in these synthesizers: Korg Polysix, Korg Mono/Poly, Fairlight II, PPG Wave 2.2 und 2.3, Emu SP-1200, Siel DK600, Siel Opera 6. The first Prophets used the SSM2040 – the precedessor of the 2044 – that generates a very similar sound.

The special feature of the 4 pole low pass SSM2044 is the patented so-called “true open loop design” that delivers a characteristic fat sound not available from other devices” (extract from SSM2044 data sheet). The module will feature voltage controlled resonance and a sensitve audio input to obtain distortion – if desired.
 
 
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A-106-1 X-Treme Filter
A-106-1 X-Treme Filter
A-106-1 X-Treme Filter

 

  • Type/ Filter
  • Width/ 14HP
  • Power/ +30mA/-30mA
  • Depth/ 40mm

 
Module A-106-1 has its origin in our experiments to built a MS20 filter clone. The famous original MS20 included two filters: a 12 dB lowpass and a 6dB high pass filter connected in series both with a very special design (the MS20 highpass is 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 lowpass and highpass for 2 different audio signals (a bit similar to the A-101-1 Steiner Vactrol filter that has even different audio inputs available, but with the special MS20 circuit). For this two separate audio inputs for lowpass (LP) and highpass (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 polarized input. 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 notch (+) and bandpass (-) filter functions too.
 
 
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A-106-5 12dB SEM Filter
A-106-5 12dB SEM Filter
A-106-5 12dB SEM Filter

 

  • Type/ Filter
  • Width/ 8HP
  • Power/ +30mA/-20mA
  • Depth/ 55mm

 
Module A-106-5 is a 12dB multimode filter that is based on the filter circuit of the Oberheim SEM module.The filter is equipped with a band pass output and a combined low/notch/high pass output.

For this output a control knob defines the relation between low and high pass signal. If both signals appear at the same level (i.e. middle position of the Mix knob) one obtains a notch filter. Otherwise the low or high pass signal predominates. The module does not feature self oscillation in contrast to most of the other filters of the A-100 system. The module generates a distorted audio signal if the level control is set to about 50% (i.e. center position) or
more with A-100 standard signals like VCOs.

– Inputs: Audio In, CV1 In without attenuator, CV2 In with Polarizer
– Outputs: Bandpass Out, Low/Highpass Mix-Out
– Controls: Audio Attenuator, CV2 Polarizer, Frequency, Resonance, LP/HP Mix
 
 
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A-106-5 Special Edition
A-106-5 Special Edition
A-106-5 Special Edition

 

  • Type/ Filter
  • Width/ 8HP
  • Power/ +30mA/-20mA
  • Depth/ 55mm

 
Module A-106-5 is a 12dB multimode filter that is based on the filter circuit of the Oberheim SEM module. The filter is equipped with a band pass output and a combined low/notch/high pass output. For this output a control knob defines the relation between low and high pass signal. If both signals appear at the same level (i.e. middle position of the Mix knob) one obtains a notch filter. Otherwise the low or high pass signal predominates. The module does not feature self-oscillation in contrast to most of the other filters of the A-100 system. The module generates a distorted audio signal if the level control is set to about 50% (i.e. center position) or more with A-100 standard signals like VCOs.

Inputs: Audio In, CV1 In without attenuator, CV2 In with Polarizer
Outputs: Bandpass Out, Low/Highpass Mix-Out
Controls: Audio Attenuator, CV2 Polarizer, Frequency, Resonance, LP/HP Mix
 
 
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A-106-6 XP Filter
A-106-6 XP Filter
A-106-6 XP Filter

 

  • Type/ Filter
  • Width/ 12HP
  • Power/ +50mA/-50mA
  • Depth/ 50mm

 
Module A-106-6 is a multimode filter that is based on the filter circuit of the Oberheim Xpander. The module features 15 different filter types with 8 filters available simultaneously.

The toggle switch Filter Group is used to switch between 2 filter groups.

These filter types are available:
– 1L (6 dB low pass)
– 2L (12 dB low pass)
– 3L (18 dB low pass)
– 4L (24 dB low pass)
– 1H (6 dB high pass)
– 2H (12 dB high pass)
– 3H (18 dB high pass)
– 2B (6 dB band pass)
– 4B (12 dB bandpass)
– 2N (notch)
– 3A (allpass)
– 2H1L (asymmetrical band pass made of a 12 dB high pass and a 6 dB low pass)
– 3H1L (asymmetrical band pass made of a 18 dB high pass and a 6 dB low pass)
– 2N1L (combination of notch and 6 dB low pass)
– 3A1L (combination of allpass and 6 dB low pass)
 
 
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A-107 Multitype Morphing Filter
A-107 Multitype Morphing Filter
A-107 Multitype Morphing Filter

 

  • Type/ Filter
  • Width/ 26HP
  • Power/ +200mA/-mA
  • Depth/ 40mm

 
Module A-107 is a completely new voltage controlled filter that has available 36 filter types: different versions of low pass, high pass, band pass, notch, all pass and filters with new response curves that have no name up to now.

The filters are organized in two groups of 18 filters each.

The transition between different filter types within one group can be soft (morphing) or hard (switching).

The filter was inspired by the ERWIK Musikelektronik Multimode Filter, which is based on the filter used in the Oberheim Matrix 12 resp. Xpander.

The possibilities of the A-107 go far beyond these filter designs as a lot of new filter types are available and the transition between filters can be soft (morphing) or hard (switching) and the filters can be arranged in 64 different voltage controlled filter chains.
 
 
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A-108 6/12/24/48dB Low Pass Filter
A-108 6/12/24/48dB Low Pass Filter
A-108 6/12/24/48dB Low Pass Filter

 

  • Type/ Filter
  • Width/ 12HP
  • Power/ +40mA/-40mA
  • Depth/ 75mm

 
Module A-108 is a completely new voltage-controlled low pass pass filter based on the well-known transistor ladder (Moog ladder). The module has internally an 8 stage low pass filter with different slopes available: 6, 12, 18, 24, 30, 36, 42 and 48 dB per octave.

In addition it features an band pass output (i.e. band pass with transistor ladder).

In the factory the 4 low pass outputs of the A-108 are internally connected to the filter stages 6, 12, 24 and 48dB. From our first A-108 audio tests this seems to be the best output combination as these outputs generate audible different sounds. E.g. the audible difference between the 48dB and 42dB or between 42dB and 36dB is very little. But if desired any of the filter stages can be connected to one of the outputs.
 
 
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A-110 Standard VCO
A-110 Standard VCO
A-110 Standard VCO

 

  • Type/ Oscillator
  • Width/ 8HP
  • Power/ +34mA/-18mA
  • Depth/ 28mm

 
VCO

Module A-110 is a voltage-controlled oscillator. This VCO’s frequency range is about eight octaves (ca. 15Hz … 8kHz). It can produce four waveforms simultaneously: square, sawtooth, triangle, and sine wave (triangle and sine shapes are not perfect, see remark below). The frequency or pitch of the VCO is determined by the position of the octave (Range) switch and tuning (Tune) knob, and by the voltage present at the CV inputs. Frequency modulation (FM) of the VCO is therefore a possibility. Footage (the octave of the fundamental) is set by the Range control in five steps, and Fine tuning controlled by the Tune knob by about +/-1 one semitone (can be modified for a wider range).

You can control the pulse width of the square wave either by hand, or by voltage control – Pulse Width Modulation or PWM.
 
 
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A-110-1 Vintage Edition
A-110-1 Vintage Edition
A-110-1 Vintage Edition

 

  • Type/ Oscillator
  • Width/ 10HP
  • Power/ +90mA/-20mA
  • Depth/ 51mm

 
Module A-110 is a voltage-controlled oscillator. This VCO’s frequency range is about eight octaves (ca. 15Hz … 8kHz). It can produce four waveforms simultaneously: square, sawtooth, triangle, and sine wave.

The frequency or pitch of the VCO is determined by the position of the octave (Range) switch and tuning (Tune) knob, and by the voltage present at the CV inputs.

Frequency modulation (FM) of the VCO is therefore a possibility.

Footage (the octave of the fundamental) is set by the Range control in five steps, and Fine tuning controlled by the Tune knob by about +/-1 one semitone (can be modified for a wider range).

You can control the pulse width of the square wave either by hand, or by voltage control – Pulse Width Modulation or PWM.
 
 
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A-110-2 Basic VCO
A-110-2 Basic VCO
A-110-2 Basic VCO

 

  • Type/ Oscillator
  • Width/ 8HP
  • Power/ +150mA/-30mA
  • Depth/ 41mm

 
Module A-110 is a voltage-controlled oscillator. This VCO’s frequency range is about eight octaves (ca. 15Hz … 8kHz). It can produce four waveforms simultaneously: square, sawtooth, triangle, and sine wave.

The frequency or pitch of the VCO is determined by the position of the octave (Range) switch and tuning (Tune) knob, and by the voltage present at the CV inputs.

Frequency modulation (FM) of the VCO is therefore a possibility.

Footage (the octave of the fundamental) is set by the Range control in five steps, and Fine tuning controlled by the Tune knob by about +/-1 one semitone (can be modified for a wider range).

You can control the pulse width of the square wave either by hand, or by voltage control – Pulse Width Modulation or PWM.
 
 
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A-110-2 Vintage Edition
A-110-2 Vintage Edition
A-110-2 Vintage Edition

 

  • Type/ Oscillator
  • Width/ 8HP
  • Power/ +150mA/-30mA
  • Depth/ 50mm

 
Module A-110 is a voltage-controlled oscillator. This VCO’s frequency range is about eight octaves (ca. 15Hz … 8kHz). It can produce four waveforms simultaneously: square, sawtooth, triangle, and sine wave.

The frequency or pitch of the VCO is determined by the position of the octave (Range) switch and tuning (Tune) knob, and by the voltage present at the CV inputs.

Frequency modulation (FM) of the VCO is therefore a possibility.

Footage (the octave of the fundamental) is set by the Range control in five steps, and Fine tuning controlled by the Tune knob by about +/-1 one semitone (can be modified for a wider range).

You can control the pulse width of the square wave either by hand, or by voltage control – Pulse Width Modulation or PWM.
 
 
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A-138m Matrix Mixer
A-138m Matrix Mixer
A-138m Matrix Mixer

 

  • Type/ Mixer
  • Width/ 20HP
  • Power/ +30mA/-30mA
  • Depth/ 20mm

 
Module A-138m is a 4 x 4 matrix mixer with switches for unipolar/bipolar mode for each column.

Unipolar means that the controls work as attenuators.

Bipolar means that the controls work as polarizers. In this mode the amplification is zero in the middle position of the corresponding control. Turning the knob counterclockwise from the center position the signal is subtracted from the output sum with increasing amount (i.e. negative). Turning the knob clockwise from the center position the signal is added to the output sum with increasing amount.

By means of an internal jumper one can select if the four upper controls work as DC offset generators – provided that no patch cord is plugged into the upper input socket.

If this feature is not required it can be deactivated by removing the jumper on top left of the pc board. The function is identical to the A-138a/b
 
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A-168-1 PWM
A-168-1 PWM
A-168-1 PWM

 

  • Type/ Utility
  • Width/ 4HP
  • Power/ +20mA/-20mA
  • Depth/ 20mm

 
Module A-168-1 is a pulsewidth modulation generator (PWM Module). It derives a rectangle signal with adjustable pulsewidth from an external triangle, sawtooth or sine wave. The external signal can be an LFO, VCO or any other signal with falling/rising slopes (e.g. ADSR). In addition the pulsewidth can be modulated by a CV signal (e.g. LFO or ADSR).
The typical application is the generation of a rectangle signal with PWM from VCOs or LFOs which do not yet have this feature.
 
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A-180-2 Multiples
A-180-2 Multiples
A-180-2 Multiples

 

  • Type/ Utility
  • Width/ 2HP
  • Power/ passive
  • Depth/ 10mm

 
Module A-180-1 is a simple multi-connector.

It has eight inter-connected sockets, so that you can patch more inputs or outputs into any module.

The sockets are split into two groups of four.

If an 8-fold multiple is required a bridge has to be soldered at the pc board.

Even though the A-180-1 is a very “primitive” low-level module it is required very often. Within a big A-100 system sufficient multiples should be planned.
 
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A-184-2 VC CF and Triangle to Sine Wave Shaper
A-184-2 VC CF and Triangle to Sine Wave Shaper
A-184-2 VC CF and Triangle to Sine Wave Shaper

 

  • Type/ Wave shaper
  • Width/ 4HP
  • Power/ +30mA/-30mA
  • Depth/ 35mm

 
The A-184-2 contains two independent circuits. On one hand there’s a curve converter which forms a triangle into a nealy perfect sine; pretty handy as an oscillator expancer for VCOs without a sine or with an inperfect one. On the other hand the module features a voltage controlled crossfader which, using high quality SSM-VCAs, is intended for audio.

The upper part of the module is, like stated before, is a very precise curve converter for generating an utterly clean sine wave from a triangle wave.

The bottom part is a circuit for crossfading between two input signals to one output. This can happen manually with the CF control as well as voltage controlled via the scaleable CV input.
Both inputs are equipped with LEDs displaying signal levels. The A input is normalized to the sine converters’ output.
 
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Blind Panel 1HP
Blind Panel 1HP

 
blank panel 1HP (5mm), raw aluminium
 
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