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Synth modules

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Intellijel Buff Mult Eurorack Module
Cat: 563563 Rel: 10 Mar 15
 
Buffered multiple synth module, 2HP wide
Notes: Dual 1 x 3 buffered mult (one audio or cv signal in with multiple buffered outputs).

The output of the first mult is normalled to the input of the second mult to create a 1×6 buffered mult
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 9 in stock $76.20
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Intellijel Mult Passive Multiple Eurorack Module
Cat: 563665 Rel: 11 Mar 15
 
Passive multiple synth module, 2HP wide
Notes: Dual 4-way passive mult (one audio or cv signal in with multiple unbuffered outputs)

On the back of the pcb is a pair of solder points marked as "link". You can connect these (with a solder blob or small jumper wire) to turn the mult into a single 8 channel Mult instead of 2 x 4 channel.
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 3 in stock $33.34
Intellijel Plog Voltage Controlled Logic & Tap Clock Eurorack Module
Cat: 563674 Rel: 10 Mar 15
 
Voltage controlled logic & tap clock eurorack synth module with dual 3-input logic block
Notes: The Plog module comprises two programmable logic sections (select one of six different 3 input boolean logic types) as well as a toggle flipflop and data flipflop block. all four sections are linked together via specially planned normals.

This module was primarily designed as an interesting tool to be used with sequencers. you can derive complex rhythmic sequences from basic sparse sources (e.g. from a simple gate sequence or clock). by adding vc control of the logic types via some kind of cv source like a triggered envelope, lfo or sequencer you produce even more complex results.

Plog can also be used in many other creative applications including making interesting timbres and for self generating patches.
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 1 in stock $221.88
Intellijel Unity Mixer Dual 3:1 Audio & CV Mixer Eurorack Module
Cat: 563709 Rel: 10 Mar 15
 
Dual 3:1/6:1 unity gain mixer (for cv or audio) synth module, 2HP wide
Notes: Dual 3:1 audio and cv mixer (up to three buffered inputs with a single buffered output).

NOTE: Version 2 of the Unity Mixer has two sets of jumpers on the main pcb. These allow the top and bottom sum to be set to -6dB attenuation instead of unity gain. This creates more headroom when summing higher amplitude sources like raw VCO signals.
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 3 in stock $78.44
Doepfer A-136 Distortion & Waveshaper Module (B-STOCK)
Cat: 787958 Rel: 29 Jan 19
 
B-STOCK: Slight surface marks
Notes: ***B-STOCK: Slight surface marks ***


Distortion/Waveshaper module for dynamic distortion of audio signals with extended settings. The applications of this module are waveform modifications and distortion like clipping and waveshaping of audio signals and control voltages (e.g. LFO).

The input is split by the module into three parts, processed by them and then mixed together:

- The original signal which can be amplified or attenuated with the "A" control
- Negative signal component with adjustable and voltage controllable clipping level "-L" and amplitude "-A"
- Positive signal component with adjustable and voltage controllable clipping level "+L" and amplitude "+A"

The amplitude parameters of both the positive and negative components can amplify in a positive or inverted fashion i.e. it can fold the signal. This creates additional harmonics and enriches the sound, creating very living sounds, especially when modulated by dynamic CVs.
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 1 in stock $72.56
Doepfer A-111-5 Mini Synthesiser Voice Module
Cat: 785445 Rel: 10 Sep 20
 
Synthesiser voice module
Notes: A fully modular, Eurorack-format version of the excellent Dark Energy synth, the A-111-5 offers VCO, VCF, LFOs, VCA and envelope generator in a compact format. Brilliant value for a starter system.

Supplier's Notes:
Module A-111-5 is a complete monophonic synthesizer module that includes these components (modular version of Dark Energy):

VCO
Manual tune control (with an internal jumper the range can be set to ~ +/-1 half an octave or ~ +/-2.5 octaves)
Range switch -1 / 0 / +1 octave
Frequency range about 10Hz ... 12kHz - FM (frequency modulation) control with modulation source switch (LFO1 / off / ADSR)
Manual pulsewidth control for rectangle waveform
PWM control with modulation source switch (LFO2 / off / ADSR)
Waveform switch (sawtooth / off / triangle)
The sum of the waveform chosen by this switch and the rectangle is fed into the VCF (to turn the rectangle off the PW control has to be set fully CCW)
External CV input for VCO frequency (1V/octave)
External CV input for external PWM of the rectangle - internal CV input for frequency (1V/octave) connected to the A-100 bus via jumper, the jumper can be used to interrupt this internal connection if not wanted

VCF
24 dB low pass
~ 12 octaves frequency range
Manual frequency control
Tracking switch half - off - full (internally connected to the external frequency CV input of the VCO, i.e. the VCF tracks to the VCO if the switch is set to "half" or "full" position)
XM: exponential FM (frequency modulation) control with modulation source switch (LFO2 / off / ADSR)
LM: linear FM (frequency modulation) control to modulate the VCF by the triangle of the VCO in a linear (!) manner
Manual resonance control (up to self oscillation)
External audio input (this signal is added to the VCO signal)
External CV input for filter frequency - 1V/octave tracking for usage of the VCF as a sine wave oscillator (not as precise as the VCO but much better than most of the other filters)
VCA
Manual amplitude control
AM (amplitude modulation) control with modulation source switch (LFO1 / off / ADSR)
External CV input for VCA amplitude - special control scale: exponential scale in the range from about -20dB to -80/90dB, linear scale from about -20dB to 0dB (Remark: this special control scale results in a loudness behaviour that is a bit different from pure linear or exponential VCA)
LFO1 and LFO2
Manual frequency control
Waveform switch (triangle / off / rectangle)
Range switch (low, audio, medium) - LED display (dual green/red color for positive/negative share of the signal)
The inverted LFO1 signal is available as an additional socket (to use the LFO1 signal for external modules)
An internal jumper can be used to select between the LFO1 signal or the inverted LFO1 signal

ADSR
Manual controls for Attack, Decay, Sustain, Release
Range switch (long, short, medium) - blue LED display
ADSR signal is available as an additional socket (to use the ADSR signal for external modules)
Gate input connected to the A-100 bus via jumper, the jumper can be used to interrupt this internal connection if not wanted

Remarks:
As the LFO frequencies can go up to moderate audio range (~ 5kHz) even audio FM effects of VCO (pitch and pulsewidth), VCF and ADSR are possible.

If the VCO is turned off (waveform switch = center position, pulsewidth control = fully CCW) and the VCF resonance is set to maximum the module can be used as a sine oscillator. The sine can be modulated in a linear manner from the triangle wave of the VCO and by LFO2 in an exponential manner at the same time !

From the factory the socket labelled "LFO1" outputs the inverted LFO1 signal. But as the module has several internal pin headers available even another signal may appear at this socket by changing the internal module patch. These six pin headers are available: LFO1 output, LFO2 output, ADSR output, inverter input, inverter output, output socket. The internal default patch is LFO1 -> inverter input, inverter output -> output socket (i.e. socket = inverted LFO1). But even another signal can be patched to this socket (e.g. inverted ADSR, non-inverted LFO1, inverted or non-inverted LFO2). It is also possible to add a blind panel next to the A-111-5 with a couple of sockets that are connected to the corresponding pins of the A-111-5 pc board. The in- and outputs of the VCO, VCF and VCA are not available as pin headers because the VCO, VCF and VCA are internally connected in the circuit which is used in this module.
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MRP:$367.10 SAVE 19%
 3 in stock $295.82
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Doepfer A-134-1 Voltage Controlled Panner & Crossfader Module
Cat: 716920 Rel: 29 Jan 19
 
Voltage-controlled panning module consisting of 2 linear VCA's - 8HP
Notes: A-134-1 is a voltage controlled universal panning and/or crossfader module. If the module is used a voltage controlled Panning device one audio signal is panned to two different outputs. If the module is used a voltage controlled Crossfader two audio signals are mixed to one common output. The module enables even compositions of both functions.

The module contains two linear high quality VCAs (made with CEM3381/PA381 until April 2013, SSM2164 from May 2013). VCA2 works in the opposite direction of VCA1 i.e. the more VCA1's loudness increases the more VCA2's loudness decreases. The panning or crossfading is adjusted with a control knob (manual control) and by two external control voltages, one equipped with an attenuator. Suitable control voltage sources are e.g. LFOs (A-145, A-146, A-147), envelope signals (A-140, A-141, A-142, A-119), random (A-118), Theremin (A-178) or a voltage coming from a MIDI-to-CV-Interface (A-190, A-191). The panning/crossfading is displayed with 2 LEDs.

A-134-1 has an audio input with attenuator for each VCA. If the audio input of VCA2 is not used the audio input of VCA1 is connected with audio in of VCA 2, i.e. the sockets are "normalled". The module has three audio outputs: Left Output (VCA1), Right Output (VCA2) and Mix. For Panning applications the outputs Left Out and Right Out are used. If the module is used as a Crossfader the Mix Output functions as output.

Module A-134-1 enables voltage controlled stereophonic panning effects (one audio signal distributed to two outputs), crossfading effects (two audio inputs mixed to one audio output with voltage controlled loudness proportion) and combinations of both effects.
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MRP:$106.23 SAVE 15%
 2 in stock $90.75
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Doepfer A-134-2 Dual Voltage Controlled Crossfader Module
Cat: 716922 Rel: 29 Jan 19
 
Dual crossfader module for voltage controlled morphing between two audio or CV signals
Notes: Module A-134-2 contains two identical voltage controlled crossfader units.

Each unit has two voltage controlled amplifiers (VCAs) with opposite control behaviour available. The outputs of the two VCAs are mixed together to obtain a common output. The behaviour of the control voltage inputs can be chosen with an internal jumper:

Symmetrical mode: If the corresponding jumper is not set both VCAs of the crossfader have the same 50% amplification with zero CV. If the applied CV becomes positive the amplification of VCA1 decreases and those of VCA2 increases in the same way. A negative CV has the opposite result. The CV voltage range to obtain the maximum/minimum positions of the crossfader is about -2.5....+2.5V. This mode is useful for bidirectional (i.e. positive and negative) control voltages, for example LFO or joy stick (adjusted to 0V CV in centre position).

Asymmetrical mode: If the corresponding jumper is set VCA2 is fully closed and VCA1 has full 100% amplification with zero CV. If the applied CV becomes positive the amplification of VCA1 decreases and those of VCA2 increases in the same way. The CV voltage range to obtain the maximum/minimum positions of the crossfader is about 0...+5V. A negative CV has no function in this mode. This mode is useful for unidirectional (i.e. only positive) control voltages, for example ADSR, ribbon controller or Theremin control voltage.

The CV input of the upper unit (CV1) is normalled to the CV input of the lower unit (CV2). I.e. if no plug is inserted to CV2 the CV input of the upper unit (CV1) also controls the lower unit.

The second signal input of the upper unit (In1B) is normalled to the first signal input of the lower unit (In2A). I.e. if no plug is inserted into In2A the signal In1B is used as the first signal input of the second unit.

As the inputs and outputs are DC coupled the module can be used for both audio and control voltage signal processing.
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 1 in stock $77.31
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Doepfer A-136 Distortion & Waveshaper Module
Cat: 716925 Rel: 29 Jan 19
 
Distortion/wavehaping module with extensive adjustment parameters - 8HP
Notes: Distortion/Waveshaper module for dynamic distortion of audio signals with extended settings. The applications of this module are waveform modifications and distortion like clipping and waveshaping of audio signals and control voltages (e.g. LFO).

The input is split by the module into three parts, processed by them and then mixed together:

- The original signal which can be amplified or attenuated with the "A" control
- Negative signal component with adjustable and voltage controllable clipping level "-L" and amplitude "-A"
- Positive signal component with adjustable and voltage controllable clipping level "+L" and amplitude "+A"

The amplitude parameters of both the positive and negative components can amplify in a positive or inverted fashion i.e. it can fold the signal. This creates additional harmonics and enriches the sound, creating very living sounds, especially when modulated by dynamic CVs.
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 2 in stock $71.71
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Doepfer A-137-1 Voltage Controlled Wave Multiplier I Module
Cat: 716930 Rel: 29 Jan 19
 
Voltage-controlled wave form multiplier - 14HP
Notes: A-137 is a voltage controlled Wave Multiplier. The basic idea of a wave multiplier is to multiply the waveform of an incoming signal (e.g. triangle/saw/sine from a VCO) within one period of the waveform. This leads to additional harmonics of the incoming signal. The period and consequently the pitch of the signals remains unchanged (in contrast to frequency multiplication e.g. with the PLL module A-196).

The A-137 works as a kind of "inverse low pass filter", i.e. it adds a lot of harmonics to a signal that contains none or only a few harmonics (e.g. sine or triangle waveform). In contrast to that a low pass filter (e.g. A-120) removes harmonics from a signal that contains a lot of harmonics (e.g. saw or rectangle waveform). Consequently the best results are obtained in combination with input signals poor in harmonics (e.g. sine or triangle). The A-137 can be used with signals rich in harmonics too (e.g. saw) but the effect is not as remarkable as for triangle or sine waves. For rectangle signals none or only little effects are obtained.

The A-137 is a very sophisticated wave multiplier that offers much more features, more controls and more waveform manipulations than other wave multipliers available so far. In addition all parameters are both manually adjusted and controlled by external voltages. These are the features of the module:

Controls:

- Input Level (to adjust the input level for best effect of the succeeding controls)
- Multiples (number of waveform multiplications, manual control)
- Harmonics (additional effect that adds more harmonics similar to the resonance/emphasis control of filters, manual control)
- Folding Level (controls upper and lower folding level, manual control)
- Symmetry (controls symmetry between upper and lower folding level, manual control)

Inputs/Outputs:

- Audio In (also suitable for control signals)
- Multiples CV In (with attenuator)
- Harmonics CV In (with attenuator)
- Folding Level CV In (with attenuator)
- Symmetry CV In (with attenuator)
- Audio Out (resp. processed control signal output)

The Multiples parameter (manual and ext. CV) defines the number of basic wave multiplications within one period. With the Folding Level and Symmetry parameter (both manual and ext. CV) the upper and lower clipping levels of the wave folder units are controlled. The Harmonics parameter (manual and ext. CV) adds some harmonic content by sharpening the waveform edges and adding overshoot peaks. It works a little bit like the resonance control of a VCF. The module is fully DC coupled, i.e. even control signal can be processed with the modules.
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MRP:$143.88 SAVE 17%
 2 in stock $118.78
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Doepfer A-137-2 Voltage Controlled Wave Multiplier II Module
Cat: 716933 Rel: 29 Jan 19
 
Generates four phase shifted copies of a VCO signal applied to the audio input
Notes: Module A-137-2 is another version of a wave multiplier. In contrast to the A-137-1 Wave Multiplier I, the A-137-2 generates four phase-shifted copies of a VCO signal applied to the audio input. The four shifted signals are added to the original signal to obtain a fat sound similar to five independent VCOs. The phase shifting is made by a simple circuit that works only for sloped signals like sawtooth, triangle or sine, but not for rectangles or pulses.

The audio input signal (typically a sawtooth, triangle or sine wave from a VCO) is compared with a slowly varying control voltage (CV Shift In). The output of the comparator is a rectangle wave with variable pulse width. When the output of the comparatur is added to the input signal (a sawtooth in the example) with the correct level relation between both signals one obtains a phase shifted sawtooth. The left picture shows the incoming sawtooth wave on top. The two horizontal dashed lines (blue and orange) indicate two different comparison levels. Below the incoming sawtooth the two resulting comparator outputs (rectangle waves) and the two resulting shifted sawtooth waves are shown. It is not a "real" phase shift but an algebraic function. But the result is virtually the same. One could obtain the same function even with several comparator modules A-167 and mixers A-138a/b or polarizing mixers A-138c. But this would require a lot of modules.

The module has available four manual shift controls and four control voltage inputs with attenuators for the four internal shifting circuits. Typical sources for these inputs are LFOs, VCLFOs, random voltages, envelope generators, sequencers or other control voltage sources. Internally eight single outputs are available at single pins: the four shifted signals and in addition four rectangle outputs. A corresponding breakout module with eight sockets is in the planning stage and will be released provided that there are sufficient inquiries. The original signal and the four shifted signals are equipped with internal jumpers. If external toggle switches are used instead of the jumpers each of the 5 signals can be turned on/off individually.

The audio input is equipped with an attenuator to adjust the level for the right summation of the original and the comparator signals (as described above).
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 2 in stock $84.03
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Doepfer A138bv Exponential Mixer Module (vintage edition)
Cat: 716939 Rel: 29 Jan 19
 
Logarithmic mixer for mixing up to four signals to one output - 8HP
Notes: Module A-138 is a four channel mixer, which can be used with either control voltages or audio signals. Each of the four inputs has an attenuator, and there's a master attenuator, so that the mixer can be used at the end of the audio chain - i.e. it can be used to interface directly with an external mixer, amplifier, etc.

A-138b features potentiometers with logarithmic response, so especially suitable for audio signal mixing.

Vintage Edition with a black faceplate and custom knobs.
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 2 in stock $73.95
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Doepfer A-138d Crossfader & FX Insert Module
Cat: 716947 Rel: 29 Jan 19
 
Crossfader for two different A-100 signals, plus insert for external effects
Notes: The A-138d primarily is used for crossfading between two modular signals. On the other hand you can used it for inserting stompboxes or other effects into your modular system. Both the inputs and the mix output are available twice, like a mini-multiples e.g. for using the input signal also for other applications, kind of like a Thru.

Crossfader: With the crossfading control CF you blend manually between the inputs In 1 and In 2. The Mute switch allows for muting one of the two signals, independent on the crossfader position.

Effect insert: The signal at input In1 is emitted at the FX Send output and can be attenuated with the Atten. control because the modular system works with much higher levels.

The effect unit's output is inserted to the FX Return input socket and its level can be boosted with the Amp. control. The processed signal is available at the bottom in 2 socket.

Use the CF control to blend between the original signal and the effect signal and to mute switch for quick muting e.g. of the effect return signal.
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 2 in stock $77.31
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Doepfer A-162 Dual Trigger Delay Module
Cat: 745790 Rel: 10 Sep 19
 
8HP dual trigger delay for Eurorack
Notes: Module A-162 contains two identical circuits that generate a trigger signal with adjustable delay and length from an incoming rectangle signal (e.g. gate, trigger, rectangle output of an LFO or VCO). The rising edge of the incoming signal is used to trigger the new trigger signal. This module makes it possible to delay the onset of a trigger pulse, and also change its length.

On each of the two units, two controls can alter the onset time and duration of triggers, from about 2 ms up to more than 10 seconds. A control LED shows the generated signal.
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MRP:$76.65 SAVE 11%
 1 in stock $68.35
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Intellijel Mult 1U Rack Dual 1x5 Passive Multiple Module
Cat: 602202 Rel: 04 Apr 16
 
Passive multiple synth module
Notes: Dual 1x5 Passive Multiple

Two rows of 1 x 5 Passive Multing
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 4 in stock $31.10
Intellijel Quadratt 1U Quad Attenuator Attenuverter Mixer & DC Voltage Source Module
Cat: 602205 Rel: 04 Apr 16
 
Quad attenuator, attenuverter, mixer and DC voltage source - 28HP wide
Notes: The shorter and wider brother to the popular Triatt module!

The four handy knobs can act as active attenuators (unipolar) or attenuverters (bipolar) depending on the setting of the two-position switches above each one.

Each input is normalled to a precision +5V DC voltage source. With nothing plugged into the jacks, each knob controls a voltage range of 0 to +5 v or -5 to +5 v depending on the position of the mode switch.

- 2 modes for each channel
- 5v normalled to each input
- With external signals it acts as active/buffered attenuator/attenuverter/mixer
- Each output normalled to mix into the adjacent channel on the right making it possible to do sub mixes in groups of 2, 3 or all four channels.
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MRP:$96.82 SAVE 12%
 5 in stock $85.16
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Intellijel 1U x 2HP Blank Panel
Intellijel 1U x 2HP Blank Panel (Eurorack blank panel)
Cat: 620719 Rel: 29 May 18
 
1U blank panel space made from brushed aluminium - 2HP wide
Notes: Blank panel for Intellijel 1U spaces. Made from high quality brushed aluminium that matches the 1U modules.

These can also be used for DIY purposes if you drill/mill them to fit your own custom circuits.

Comes with 2 screws.
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 1 in stock $5.89
Doepfer A-111-5v Mini Synthesizer Voice Vintage Edition Module (B-STOCK)
Cat: 803731 Rel: 18 Dec 17
 
B-STOCK: Box opened, product in perfect working order
Notes: ***B-STOCK: Box opened, product in perfect working order***


The A-111-5V is the last chance to get your hands on a first generation Dark Energy. It features exactly the same synthesis capabilities as the desktop unit. The only things missing are a MIDI-CV interface and the housing with power supply. The A-111-5V can not only be used as a fully analog synthesizer, but as a beefy filter bank with aggressive resonance as well. Thanks to the CEM3394, which was once used in the Sequential Circuits Six-Track, the module has a somewhat classic sound. Patch points allow users to combine the Mini Synthesizer Voice with other modular equipment.

The A-111-5V features the following components:

- Voluminous sounding VCO generating a pulse wave with variable width. Additionally, a triangle or saw-tooth waveform can be added. For tuning the oscillator, there are a three-way octave switch and a potentiometer. The knob's range can be edited via a jumper. (+/- 0.5 octaves or +/- 2.5 octaves) For playing the VCO, there is a 1v/octave connector. FM and PWM modulation paths with attenuators allow users to influence the oscillator via a LFO or the ADSR envelope.

- Low-pass filter with a strong grip. The circuit has a slope of -24 dB per octave. In addition to the obligatory frequency and resonance knobs, there is a three-way key tracking switch. Thanks to this, the filter can be played like a sine generator while self-oscillating. Optionally, this can also be done via a second 1v / octave voltage fed to the module via a patch point. Another highlight is the wet sounding, linear Filter FM. The VCO's triangle waveform serves as the modulation source. Exponential filter FM is possible as well. Here, a LFO or the envelope is used as the modulation source. External sound material can be fed to the filter via an audio input. Great for processing drums!

- VCA with level potentiometer. One of the LFOs or the ADSR envelope can be used for amplitude modulation with variable strength.

- ADSR envelope with range switch. (Long, medium, short)

- Two independently usable LFOs with triangle and square waves. The frequencies are determined by potentiometers and three-stage switches. Both LFOs go far into the audio range - great for modulating the VCO's frequency. The results sound very harsh and energetic.
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 1 in stock $313.99
Doepfer A-111-5v Mini Synthesizer Voice Vintage Edition Module
Cat: 671553 Rel: 18 Dec 17
 
Limited edition with the original CEM3394 ICs chips, as in the first Dark Energy model
Notes: The A-111-5V is the last chance to get your hands on a first generation Dark Energy. It features exactly the same synthesis capabilities as the desktop unit. The only things missing are a MIDI-CV interface and the housing with power supply. The A-111-5V can not only be used as a fully analog synthesizer, but as a beefy filter bank with aggressive resonance as well. Thanks to the CEM3394, which was once used in the Sequential Circuits Six-Track, the module has a somewhat classic sound. Patch points allow users to combine the Mini Synthesizer Voice with other modular equipment.

The A-111-5V features the following components:

- Voluminous sounding VCO generating a pulse wave with variable width. Additionally, a triangle or saw-tooth waveform can be added. For tuning the oscillator, there are a three-way octave switch and a potentiometer. The knob's range can be edited via a jumper. (+/- 0.5 octaves or +/- 2.5 octaves) For playing the VCO, there is a 1v/octave connector. FM and PWM modulation paths with attenuators allow users to influence the oscillator via a LFO or the ADSR envelope.

- Low-pass filter with a strong grip. The circuit has a slope of -24 dB per octave. In addition to the obligatory frequency and resonance knobs, there is a three-way key tracking switch. Thanks to this, the filter can be played like a sine generator while self-oscillating. Optionally, this can also be done via a second 1v / octave voltage fed to the module via a patch point. Another highlight is the wet sounding, linear Filter FM. The VCO's triangle waveform serves as the modulation source. Exponential filter FM is possible as well. Here, a LFO or the envelope is used as the modulation source. External sound material can be fed to the filter via an audio input. Great for processing drums!

- VCA with level potentiometer. One of the LFOs or the ADSR envelope can be used for amplitude modulation with variable strength.

- ADSR envelope with range switch. (Long, medium, short)

- Two independently usable LFOs with triangle and square waves. The frequencies are determined by potentiometers and three-stage switches. Both LFOs go far into the audio range - great for modulating the VCO's frequency. The results sound very harsh and energetic.
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MRP:$427.61 SAVE 23%
 1 in stock $329.45
Doepfer A-106-6V XP Multimode Filter Vintage Edition Module
Cat: 790473 Rel: 30 Oct 20
 
Multimode filter module
Notes: 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)

The module features voltage controlled resonance. For filter group 2 (2L, 4L, 2B ...) even self oscillation is possible. All standard VCF controls are available: manual filter frequency control Frq, one control voltage input with attenuator (FCV2)and one without attenuator (FCV1, ~ 1 V/octave). In addition voltage controlled resonance with manual control (Q) and a CV input with attenuator (QCV) are available. The circuit is based on a 24dB lowpass filter. The outputs of the four internal filter stages (i.e. the 6, 12, 18 and 24dB outputs) are mixed together with different levels and polarities to obtain 15 different filters. Because of this special circuit the outputs have slightly different levels and noise floor. This is caused by the different internal amplifications and numbers of stages that are required to generate the filter in question. If e.g. a filter is derived by one stage only (e.g. the 6 dB, 12dB, 18dB and 24dB low pass) the noise floor is smaller compared to a filter that is derived by a combination of all four filter stages. 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.

Power consumption: 50mA at +12V and 50mA at -12V
Depth: 50mm
HP : 12
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MRP:$213.81 SAVE 30%
 2 in stock $149.33
Doepfer A-135-2V Voltage Controlled Mixer Vintage Edition Module
Cat: 790453 Rel: 30 Oct 20
 
Voltage controlled mixer module
Notes: A-135-2 is a miniature version of the A-135-1. Behind a front panel with 8 HP only four linear VCAs (voltage controlled amplifiers) and a voltage controlled mixer based on the VCAs are available.

Controls, In/Outputs and Functions of each VCA:

Level (manual control of the VCA amplification), small rubberized knob (L1...L4)

Control voltage input with associated attenuator (CV1...CV4), for the full VCA control range about 0...+5V control voltage are required (attenuator fully clockwise), for higher control voltages the attenuator is used, the attenuators are without knobs, just plastic shafts with white marker

Signal Input

Signal Output

All inputs and outputs are DC coupled. Consequently the VCAs can be used to process both audio and control voltages (e.g. to control the level of LFOs or envelopes)

The signal input is not equipped with an attenuator. But the VCAs can process all signals up to 15Vpp / -7.5...+7.5V without clipping. In case of higher levels an external attenuator is required (e.g. A-183-1).

The available amplification range is 0...1, the maximal amplification is 1 (i.e. it "clips" and remains at 1 even if the control voltage goes beyond the value that corresponds to amplification 1)

Functions of the voltage controlled mixers:

two outputs ("Selected" and "All")

Selected output: the ouput if a VCA is removed from this sum signal when a plug is inserted into the corresponding VCA output.

All output: sum of all VCA outputs, regardless of inserted plugs into the VCA outputs

The maximal amplification is about 0.6 to avoid clipping at the mixer outputs (otherwise the outputs may distort with 15Vpp signals at each signal input and full amplifications)

Special functions of the voltage controlled mixer (selectable by internal jumpers)

Dual Stereo VCA: In this case the control unit of VCA1 (L1 + CV1) affects also VCA3 and the control unit of VCA2 (L2 + CV2) affects also VCA4. The control units of VCA3 (L3 + CV3) and VCA4 (L4 +CV4) are out of operation.

Quad VCA: In this case the control unit of VCA1 (L1 + CV1) affects all four VCAs. The control units of VCA2, VCA3 and VCA4 are out of operation. In this mode the module has the same function as module A-132-2. That's why module A-132-2 will be discontinued.

Normalling of the signal inputs: by means of internal jumpers signal input 1 can be normalled to signal input 2, signal input 2 to signal input 3 and signal input 3 to signal input In 4. That way the same input signal can be distributed to four different channels by means of control voltages (e.g. quadrophonic distribution of audio signals). Suitable control voltage sources are e.g. A-144 (Morphing Controller) or A-143-9 (Quadrature LFO).

Additional technical specification for each VCA (based on the specifications of the VCA circuits CEM3360/AS3360 used in the module):

Crosstalk between VCAs: typ. - 80dB

Signal attenuation at 0V CV: typ. -70dB

Total harmonic distortion: typ. 1%

Control voltage feedthrough: max. 15mV

Width: 8 HP / 40.3 mm
Depth: 45 mm (measured from the rear side of the front panel)
Current: +40mA (+12V) / -40mA (-12V)
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FORTHCOMING
Intellijel XY I/O 1U Module
Cat: 785358
 
Conncector for Intellijel products
Notes: Use this module to tap into the 3-pin LINK connector used in several Intellijel products, including Mixup, Pedal I/O and the Palette and 2nd Generation Audio Jacks Board in a 7U case.

The XY I/O uses two 3.5mm TRS jacks, which accept insert cables to provide send/return capability to a pair of Pedal I/O's, or additional stereo inputs (or outputs) to a pair of Mixups, or one of each.

A third 3-pin Link connector on the back panel allows the X and Y jacks to access the L/R (or Send/Return) jacks on a single connected module or case without needing a stereo cable.
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Doepfer A-190-3 USB MIDI To CV & Gate Interface Module (B-STOCK)
Cat: 799122 Rel: 14 Nov 19
 
B-STOCK: Box opened, product in perfect working order
Notes: ***B-STOCK: Box opened, product in perfect working order***


Module A-190-3 is a Midi/USB-to-CV/Gate interface that allows the integration of the A-100 system into a USB or Midi environment. It has available 4 analogue control voltage outputs (CV1...4) and one Gate output. A-190-3 is the modular version of Dark Link.

In/Outputs and controls:

- USB
- Midi Input
- Learn button
- Gate Out (with LED for Gate display and learn function), 0/+5V
- CV1: controlled by Midi note messages, 1V/Octave, 0...+5V
- CV2: controlled by Midi pitch bend, ~ -2.5...+2.5V or ~ 0...+5V (can be selected by an internal jumper)
- CV3: controlled by Midi velocity, 0...+5V
- CV4: controlled by Midi control change messages, free assignable controller in learn mode
- Glide control (portamento function for CV1)

Other Features:

- Midi channel, reference note and Midi control change number for CV4 are adjusted by means of a learn button and LED.
- By means of two jumpers CV1 and Gate can be connected to the corresponding lines of the A-100 bus. That way the VCOs A-110 or A-111 and the envelope generator A-140 can be controlled directly via the A-100 bus, i.e. it's not necessary to patch CV and Gate with cables between the front panels. In addition, CV1 is buffered, i.e. even several VCOs can be controlled by the A-190-3 without the need of an additional bus buffer (e.g. A-185-1 or A-185-2).
- The gate voltage can be set to +5V or +12V by means of two jumpers. For modules of the A-100 both voltages can be used. For modules or devices from other manufacturers the gate voltage has to be set accordingly.
- If you want to connect the gate output to devices that use S-Trig a special S-Trig cable is available. For details please refer to our FAQ page
- By means of the precise CV adder A-185-2 CV1 and CV2 can be added to obtain an adjustable width of the pitch bend. For this CV2 of the A-190-3 is connected to the upper input of the A-185-2 which has an attenuator available. CV1 of the - A-190-3 is connected to one of the other inputs without attenuator.
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 1 in stock $119.87
Doepfer A-135-3 Voltage Controller Stereo Mixer Module
Cat: 781306 Rel: 28 Jul 20
 
Stereo mixer module
Notes: Mix four stereo signals with CV control over levels. Doepfer's usual great value and user-friendly approach make this a great choice at an excellent price point.

Supplier notes:
A-135-3 is a is a voltage controlled stereo mixer with four inputs. Behind a front panel with 8 HP only eight linear VCAs (voltage controlled amplifiers) and the mixer based on the VCAs are available.

Controls, Inputs and Functions of each input:

Level (manual control of the VCA amplification), small rubberized knob (L1...L4)

Control voltage input with associated attenuator (CV 1...4), for the full VCA control range about 0...+5V control voltage are required (attenuator fully clockwise), for higher control voltages the attenuator is used, the attenuators are without knobs, just plastic shafts with white marker

Signal Input left/right (InL 1...4 / InR 1...4)

The signal inputs are not equipped with an attenuator. But the VCAs can process all signals up to 15Vpp / -7.5...+7.5V without clipping. In case of higher levels an external attenuator is required (e.g. A-183-1).

The sum of the left and right signals appear at the sockets Out L and Out R. The maximal amplification is about 0.5 to avoid clipping at the mixer outputs (otherwise the outputs may distort with 15Vpp signals at each signal input and full amplifications). If another maximal amplification (e.g. 1) is required two resistors have to be replaced.

All inputs and outputs are DC coupled. Consequently the module can be used to process both audio and control voltages.

Additional technical specification for each VCA (based on the specifications of the VCA circuits CEM3360/AS3360 used in the module):
Crosstalk between two channels: better than - 80dB
Signal attenuation at 0V CV: better than -80dB
Total harmonic distortion: typ. 1%
Control voltage feedthrough: max. 15mV

HP : 8
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Doepfer A-171-2 Voltage Controlled Slew Processor & Generator Module
Cat: 577809 Rel: 23 Oct 19
 
Slew processor/generator - 8HP
Notes: Module A-171-2 is a voltage controlled slew limiter with a lot of additional features beyond a simple slew limiter. It's mostly a licensed copy of Ken Stones VCS which is in turn based on the Serge VCS.

Typical applications:

- VC Slew Limiter / VC Portamento / VC Low Pass Gate:

Cycle switch = off, no trigger signal applied to Trig socket: Voltage controlled Slew limiter or portamento generator: the signal applied to the signal input is "slewed". The slew up and down times are controlled manually by means of the Up and Down controls, the effect of the CV Up and CV Down control voltages are controlled by the CV Up and CV Down controls, in exponential mode these controls also affect the slew shape (see symbols at the CCW and CW positions of the controls).

If an audio signal is applied an short slew rates are chosen the module works as a simple VCF/VCA combo.

- A/D Envelope Generator / Pulse Delay / Subharmonic Generator:

Cycle switch = off, trigger signal applied to Trig socket, no input signal: Simple Attack/Decay envelope Generator, the rise and fall times are controlled like the slew up/down times above, including the shape of the falling/rising slope of the envelope, the exp. CV input can be used to change both attack and decay simultaneously.

At the End output a pulse appears as the end of the envelope is reached (less than about 20mV), this can be used as a pulse delay.

If a series of triggers are applied to the VCS faster than the total rise and fall times, the module will divide the incoming signal by a whole number. In the audio range the output will be the sub-harmonic series.

- VCLFO / VCO:

Cycle switch = on, no trigger signal applied to Trig socket, no input signal: Voltage controlled LFO/VCO, the rise and fall times of the waveform are controlled like the slew up/down times above, including the shape of the falling/rising slope
the exp. CV input can be used like the CV input of a VCO or VCLFO, the response is exponential but not exactly 1V/oct.
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Doepfer A-188-1X 128 Stages BBD Delay Module
Cat: 755388 Rel: 13 Nov 19
 
Analogue delay module - 14HP
Notes: The A-188-1 series bases on a so-called bucket brigade device (BBD) that has been used in the pseudo-digital BBD-delays.

The version with 128 stages provides a delay time of 0.26 - 128ms and is great for Karpluss-Strong synthesis.

The module is not an entire delay but only its core with all anomalies (e.g. cross talk of the internal clock frequency), and its very independent spacey and raw sound.

There are modulation possibilities with invertible polaritiy, a dry/wet control, feedback up to self-oscillation and a feedback loop with insert.
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 1 in stock $133.35
Doepfer A-188-1XV 128 Stages BBD Delay Module (vintage edition)
Cat: 755389 Rel: 13 Nov 19
 
Analogue delay module - 14HP
Notes: The A-188-1 series bases on a so-called bucket brigade device (BBD) that has been used in the pseudo-digital BBD-delays.

The version with 128 stages provides a delay time of 0.26 - 128ms and is great for Karpluss-Strong synthesis.

The module is not an entire delay but only its core with all anomalies (e.g. cross talk of the internal clock frequency), and its very independent spacey and raw sound.

There are modulation possibilities with invertible polaritiy, a dry/wet control, feedback up to self-oscillation and a feedback loop with insert.
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 1 in stock $144.56
Doepfer A-188-1Y 256 Stages BBD Delay Module
Cat: 755390 Rel: 13 Nov 19
 
Analogue delay module - 14HP
Notes: The A-188-1 series bases on a co-called bucket brigade device (BBD) that has been used in the pseudo-digital BBD-delays.

The version with 256 stages provides a delay time of 0.51 - 256ms and is great for Karpluss-Strong synthesis.

The module is not an entire delay but only its core with all anomalies (e.g. cross talk of the internal clock frequency), and its very independent spacey and raw sound.

There are modulation possibilities with invertible polaritiy, a dry/wet control, feedback up to self-oscillation and a feedback loop with insert.
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Doepfer A-188-1YV 256 Stages BBD Delay Module (vintage edition)
Cat: 755391 Rel: 13 Nov 19
 
Analogue delay module - 14HP
Notes: The A-188-1 series bases on a co-called bucket brigade device (BBD) that has been used in the pseudo-digital BBD-delays.

The version with 256 stages provides a delay time of 0.51 - 256ms and is great for Karpluss-Strong synthesis.

The module is not an entire delay but only its core with all anomalies (e.g. cross talk of the internal clock frequency), and its very independent spacey and raw sound.

There are modulation possibilities with invertible polaritiy, a dry/wet control, feedback up to self-oscillation and a feedback loop with insert.
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Doepfer A-188-1A 512 Stages BBD Delay Module
Cat: 755392 Rel: 13 Nov 19
 
Analogue delay module - 14HP
Notes: The A-188-1 series bases on a so-called bucket brigade device (BBD) that has been used in the pseudo-digital delays of the 1980s.

The version with 512 stages provides a delay time of 1.02 - 512 ms.

The module is not an entire delay but only its core with all anomalies (e.g. cross talk of the internal clock frequency), and its very independent spacey and raw sound.

There are modulation possibilities with invertible polaritiy, a dry/wet control, feedback up to self-oscillation and a feedback loop with insert.
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Doepfer A-188-1C 2048 Stages BBD Delay Module
Cat: 755396 Rel: 13 Nov 19
 
Analogue delay module - 14HP
Notes: The A-188-1 series bases on a so-called bucket brigade device (BBD) that has been used in the pseudo-digital delays of the 1980s.

The version with 2048 stages provides a delay time range of 4.10 - 2048ms.

The module is not an entire delay but only its core with all anomalies (e.g. cross talk of the internal clock frequency), and its very independent spacey and raw sound.

There are modulation possibilities with invertible polaritiy, a dry/wet control, feedback up to self-oscillation and a feedback loop with insert.
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 3 in stock $114.30
Doepfer A-188-1CV 2048 Stages BBD Delay Module (vintage edition)
Cat: 755397 Rel: 13 Nov 19
 
Analogue delay module - 14HP
Notes: The A-188-1 series bases on a so-called bucket brigade device (BBD) that has been used in the pseudo-digital delays of the 1980s.

The version with 2048 stages provides a delay time range of 4.10 - 2048ms.

The module is not an entire delay but only its core with all anomalies (e.g. cross talk of the internal clock frequency), and its very independent spacey and raw sound.

There are modulation possibilities with invertible polaritiy, a dry/wet control, feedback up to self-oscillation and a feedback loop with insert.
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Doepfer A-188-1D 4096 Stages BBD Delay Module
Cat: 755398 Rel: 13 Nov 19
 
Analogue delay module - 14HP
Notes: The A-188-1 series bases on a so-called bucket brigade device (BBD) that has been used in the pseudo-digital BBD-delays.

The version with 4096 stages provides a delay time of 8.19 - 4096 ms.

The module is not an entire delay but only its core with all anomalies (e.g. cross talk of the internal clock frequency), and its very independent spacey and raw sound.

There are modulation possibilities with invertible polaritiy, a dry/wet control, feedback up to self-oscillation and a feedback loop with insert.
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Doepfer A-188-1V BBD Delay Module (vintage edition)
Cat: 755402 Rel: 15 Nov 19
 
Bucket Brigade Device module, 0 Stages - 14HP
Notes: Module A-188-1 is a so-called Bucket Brigade Device module.

BBDs have been used to delay audio signals before digital delays dethroned the BBD based effect units. But BBDs have some very unique advantages (or disadvantages dependent on the point of view) over the digital counterpart which result from the special properties of the BBDs. BBD circuits can be treated as a chain of Sample&Hold units (S&H) which pass on their voltages to the next S&H in the chain at each clock pulse.

In any case the sounds generated by module A-188-1 are very special. Typical applications are: Flanger, Chorus, Analog Delay or Karplus/Strong synthesis. But as the A-188-1 has a lot of very unique features (voltage controlled clock rate / delay time with extreme range, polarity switches for the CV inputs, feedback and BBD out/mix, clock and CV output of the high speed VCO, BBD clock input, feedback insert, feedback up to self-oscillation) a lot of unusual applications can be realized with the module (e.g. delay controlled by ADSR, envelope, random or sequencer with positive or negative effect).

The A-188-1 also has no built-in anti-aliasing filter in order not to limit the possibilities of the module. For this the CV out is intended.

This module comes without BBD circuit. The final adjustment is possible only with the BBD circuit used in the module. Electronic experience and measuring equipment (digital multi-meter, oscilloscope, frequency meter) are required.
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Doepfer A-188-2 Tapped BBD Delay Module
Cat: 755403 Rel: 12 Nov 19
 
Bucket brigade delay module - 30HP
Notes: A-188-2 is another module that is based on a so-called Bucket Brigade Device (BBD). If you are not familiar with BBDs please refer to the A-188-1. There you can find some details about this special type of circuits.

The main difference between A-188-1 and A-188-2 is the type of BBD circuit that leads to completely different module principles and sounds. The A-188-1 uses different single BBD chips with one signal input and one signal output only. In contrast the A-188-2 uses as so-called tapped BBD that has available six outputs - the so-called taps after the BBD stages 396, 662, 1194, 1726, 2790 and 3328. In the A-188-2 we use this special BBD circuit (MN3011) to obtain these module features:

The module has available two separate mixing sub-units. For both mixers the levels and polarities of each BBD output can be adjusted to obtain two different mixtures of the BBD outputs. A new type of potentiometers with centre detent and centre terminal is used for the BBD mixing controls to have a better feel for the neutral position. Each mixer has a wet/dry control at its output that allows choosing between the pure input signal (original), the BBD mix or anything in between. The two outputs can be treated as stereo outputs but it is also possible to use one of the outputs for other applications (details in the next paragraph).

The A-188-2 has a feedback section available that is very similar to the one in the A-188-1. But as we now have 6 different BBD outputs available 6 different feedback types are possible. The feedback input socket is normalled to the "396" output (not to "1194" as shown in the scheme, the front panel is correct). But by patching the feedback socket to any of the single output sockets another BBD tap can be used for the feedback to obtain different sounds. Even external feedback processing is possible (e.g. with a VCA for voltage controlled feedback). The feedback control has polarizer function, i.e. the neutral position is at the centre. Left from the centre the feedback signal is subtracted from the input signal, right from the centre it's added (negative/positive feedback). Even for this potentiometer the new version with centre detent is used.

A special feedback can be obtained if one of the mix outputs is used for the feedback function. In this case for each tap the positive or negative feedback share can be adjusted. This leads to multiple peaks and/or notches in the frequency response of the module.

For each tap of the BBD a separate output socket is available. These sockets can be used for changing the feedback loop - as mentioned above -, for voltage controlled mixing of the taps - e.g. with the voltage controlled mixer A-135 or other applications that require access to each single tap.

The A-188-2 uses the same high speed VCO (HSVCO) for the BBD clock as the A-188-1. The clock and consequently the delay time can be controlled manually (delay control) and by the two control voltage inputs CV1 and CV2. The sensitivity of CV1 is approximately 1V/oct. CV2 is equipped with a polarizer (a new type of potentiometers with centre detent). The HSVCO has a clock output available that is normalled to the clock input socket. These sockets can be used to link different BBD modules and to run them with the same clock. But even other applications with frequency dividers (e.g. A-163) or PLL (e.g. A-196) are conceivable. A voltage composed of the manual delay control, CV1 and CV2 is available at the CV out socket, e.g. to control an external clock suppression filter as the A-188-2 is not equipped with such a filter (same as for the A-188-1).
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Doepfer A-189-1 VBM Voltage Controlled Bit Modifier & Bit Cruncher Module
Cat: 755405 Rel: 14 Nov 19
 
Voltage controlled bit modifier module for the Eurorack A-100 system
Notes: Module A-189-1 is a voltage controlled bit modifier. It offers several voltage controlled algorithmic functions like voltage controlled bit crunching, bit shifting (with/without carry over), bit exchange, rectifying, absolute value and calculating operations like addition, subtraction, multiplication or division.

The module has two control units both with manual control and CV input with attenuator:

- One for the algorithmic function according to the selected mode (e.g. number of shifted bits): BC and BC CV
- One for the sampling rate (SR and SR CV).

The signal input is equipped with an attenuator. As the module is DC coupled even control voltages can be processed.

The mode (e.g. bit crunching, bit shifting, bit exchange) is selected by a 16-position rotary switch.
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Doepfer A-190-3 USB MIDI To CV & Gate Interface Module
Cat: 755408 Rel: 14 Nov 19
 
Midi/USB-to-CV/Gate interface - 6HP
Notes: Module A-190-3 is a Midi/USB-to-CV/Gate interface that allows the integration of the A-100 system into a USB or Midi environment. It has available 4 analogue control voltage outputs (CV1...4) and one Gate output. A-190-3 is the modular version of Dark Link.

In/Outputs and controls:

- USB
- Midi Input
- Learn button
- Gate Out (with LED for Gate display and learn function), 0/+5V
- CV1: controlled by Midi note messages, 1V/Octave, 0...+5V
- CV2: controlled by Midi pitch bend, ~ -2.5...+2.5V or ~ 0...+5V (can be selected by an internal jumper)
- CV3: controlled by Midi velocity, 0...+5V
- CV4: controlled by Midi control change messages, free assignable controller in learn mode
- Glide control (portamento function for CV1)

Other Features:

- Midi channel, reference note and Midi control change number for CV4 are adjusted by means of a learn button and LED.
- By means of two jumpers CV1 and Gate can be connected to the corresponding lines of the A-100 bus. That way the VCOs A-110 or A-111 and the envelope generator A-140 can be controlled directly via the A-100 bus, i.e. it's not necessary to patch CV and Gate with cables between the front panels. In addition, CV1 is buffered, i.e. even several VCOs can be controlled by the A-190-3 without the need of an additional bus buffer (e.g. A-185-1 or A-185-2).
- The gate voltage can be set to +5V or +12V by means of two jumpers. For modules of the A-100 both voltages can be used. For modules or devices from other manufacturers the gate voltage has to be set accordingly.
- If you want to connect the gate output to devices that use S-Trig a special S-Trig cable is available. For details please refer to our FAQ page
- By means of the precise CV adder A-185-2 CV1 and CV2 can be added to obtain an adjustable width of the pitch bend. For this CV2 of the A-190-3 is connected to the upper input of the A-185-2 which has an attenuator available. CV1 of the - A-190-3 is connected to one of the other inputs without attenuator.
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Doepfer A-190-3V USB MIDI To CV & Gate Interface Module (vintage edition)
Cat: 755410 Rel: 14 Nov 19
 
Midi/USB-to-CV/Gate interface - 6HP
Notes: Module A-190-3 is a Midi/USB-to-CV/Gate interface that allows the integration of the A-100 system into a USB or Midi environment. It has available 4 analogue control voltage outputs (CV1...4) and one Gate output. A-190-3 is the modular version of Dark Link.

In/Outputs and controls:

- USB
- Midi Input
- Learn button
- Gate Out (with LED for Gate display and learn function), 0/+5V
- CV1: controlled by Midi note messages, 1V/Octave, 0...+5V
- CV2: controlled by Midi pitch bend, ~ -2.5...+2.5V or ~ 0...+5V (can be selected by an internal jumper)
- CV3: controlled by Midi velocity, 0...+5V
- CV4: controlled by Midi control change messages, free assignable controller in learn mode
- Glide control (portamento function for CV1)

Other Features:

- Midi channel, reference note and Midi control change number for CV4 are adjusted by means of a learn button and LED.
- By means of two jumpers CV1 and Gate can be connected to the corresponding lines of the A-100 bus. That way the VCOs A-110 or A-111 and the envelope generator A-140 can be controlled directly via the A-100 bus, i.e. it's not necessary to patch CV and Gate with cables between the front panels. In addition, CV1 is buffered, i.e. even several VCOs can be controlled by the A-190-3 without the need of an additional bus buffer (e.g. A-185-1 or A-185-2).
- The gate voltage can be set to +5V or +12V by means of two jumpers. For modules of the A-100 both voltages can be used. For modules or devices from other manufacturers the gate voltage has to be set accordingly.
- If you want to connect the gate output to devices that use S-Trig a special S-Trig cable is available. For details please refer to our FAQ page
- By means of the precise CV adder A-185-2 CV1 and CV2 can be added to obtain an adjustable width of the pitch bend. For this CV2 of the A-190-3 is connected to the upper input of the A-185-2 which has an attenuator available. CV1 of the - A-190-3 is connected to one of the other inputs without attenuator.
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 2 in stock $128.86
Doepfer A-190-8 USB MIDI To Sync Interface Module
Cat: 755412 Rel: 13 Nov 19
 
MIDI/USB/CV/Gate interface module - 6HP
Notes: USB/MIDI to clock interface that allows for synchronizing clock-driven modules with the MIDI environment. It processes only the Clock, Start, Stop and Continue MIDI commands. It has several clock divider outputs, each one start, stop and reset outputs for controlling sequencers and also an interesting wait function. Input is either a 5-pin DIN socket or USB.
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 2 in stock $118.78
Doepfer A-196 PLL Phase Locked Loop Module
Cat: 755416 Rel: 14 Nov 19
 
Eurorack phase locked loop module, featuring voltage-controlled oscillator, phase comparator & low pass filter
Notes: Module A-196 contains a so-called phase locked loop (PLL). The basic PLL system is shown in the sketch at the bottom of this page. A PLL consists of three parts: voltage-controlled oscillator (VCO), phase comparator (PC), and low-pass filter (LPF). All parts are normally connected to form a closed-loop frequency-feedback system.

This is how a PLL works: The output of the internal VCO (linear CV control, rectangle output) is compared with an external signal (e.g. the rectangle output of a A-110 VCO) in the so-called phase comparator (PC). The output of the phase comparator is a digital signal (low/high/tristate) that indicates if the frequency resp. phase difference of the two input signals is negative, zero or positive. The output of the phase comparator is processed by a low pass filter (LPF) to generate a smooth voltage that is used to control the frequency of the internal VCO. The 3 units VCO, PC and LPF form a feedback loop that works like this: The control voltage (output of the LPF) increases as long as the external frequency is higher than the frequency of the internal VCO und stops increasing when both frequencies become identical. The control voltage decreases as long as the external frequency is lower than the frequency of the internal VCO und stops decreasing when both frequencies become identical.

But there are some stumbling blocks: Different types of phase comparators with advantages and disadvantages can be made. Some phase comparators e.g. even lock at harmonics, i.e. if the two frequencies to be compared are integer multiples. But for some applications this can be used to create interesting effects. The A-196 contains 3 different types of phase comparators: PC1 is a simple exclusive OR, that even locks at harmonics. PC2 is a so-called RS flipflop and PC3 a more complex digital memory network. The user can select one of the three phase comparators with a 3-position switch. When PC2 is used a LED displays the "locked" state, i.e. when the frequency of the internal VCO is identical to the external frequency.

Special attention has to be directed to the frequency of the LPF. To obtain a smooth control voltage for the VCO the frequency of the LPF has to be much smaller than the lowest frequency of the internal or external audio signal. Otherwise the frequency of the internal VCO will jitter or wobble around the correct frequency. But for special effects this frequency jitter can be used intentionally. Example: frequencies in the range 50Hz...1kHz have to be processed with the PLL. Therefore the frequency of the LPF has to be about 10Hz or even less. Such a low frequency of the LPF causes a noticeable slew of the internal VCO. When the frequency of the external signal jumps e.g. between 500Hz and 1kHz it takes about 0.1 second until the internal VCO reaches the new frequency (like portamento). So one has to find a compromise between frequency jitter and portamento. But these remarks are valid only for the "ideal" working PLL. As the A-196 is used in a musical environment the "problems" and disadvantages with jitter and slew time lead to additional musical applications like portamento effects, wobbling frequencies or harmonic locking according to the type of frequency comparator and time constant of the PLL low pass filter. Instead of the internal manually controlled low pass filter the voltage controlled slew limiter A-171 can be used to obtain voltage control of this parameter. Normal audio filters (e.g. A-120, A-121) cannot be used for this job as the minimum frequency is to high (down to a few Hz or even less necessary) and the signal has to be DC coupled due to the low frequencies. Audio filters are normally AC coupled.

Another very important application of a PLL is frequency multiplication in combination with an external frequency divider. For this the output of the PLL-VCO is processed through an external frequency divider (e.g. A-163, A-160, A-161, A-115) before it is fed to In1 of the phase comparator. In this case the frequency of the PLL-VCO will be a multiple of the master frequency. E.g. if the A-163 is used and adjusted to dividing factor 5 the frequency of the PLL-VCO will be 5 times the frequency of the master VCO. Consequently, frequency division (A-163) leads to frequency multiplication with the PLL circuit. In combination with the PLL low pass frequency several effects can be realized (frequency multiplication with portamento or wobbling). The frequency multiplication can even be used to drive a graphic VCO. If your graphic VCO e.g. has 8 steps (e.g. A-155) and you use a frequency divider with factor 8 in the PLL feedback the output of the graphic VCO has the same frequency as the master VCO. Another application is the generation of pseudo-harmonics (not real harmonics as only rectangle waves are available) or clock generation for switched-capacitor filters.
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Intellijel Stereo Line In 1U Stereo Balanced Line Audio Input Module
Cat: 768942 Rel: 13 Mar 20
 
audio input module
Notes: Use the Stereo Line In 1U system to bring external audio into your modular system for processing. The system works with balanced +4 dBu professional audio products and with -10dbV unbalanced gear.

The Stereo Line In 1U system comprises two components:

The Stereo Line In 1U module:
Either a Stereo In Jacks 1U module, or a case with built-in 14" audio jacks, such as Intellijel's Palette or 7U cases (with a 2nd generation Audio Jacks board).

Width: 12HP
Depth: 38mm
Power: 18mA @ +12V
12mA @ -12V
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Doepfer A-148v Dual Sample & Hold Track & Hold Module (vintage edition)
Cat: 745775 Rel: 10 Sep 19
 
Two sample & hold units in one module for generating stepped random voltages or slicing signals
Notes: Module A-148 (Dual S&H) has two identical sample & hold modules, designed to produce 'staircase' voltages. The signal present at the sample input is sampled at a rate set by the signal at the trigger input, and held at that voltage at the S&H output.

The exact shape of the staircase depends on the sort of waveform at the sample input: NOISE or RANDOM signals produce random patterns; an LFO produces rising or falling staircase patterns.

Two LEDs for each S&H indicate the voltage (positive or negative) of the sampled signal.
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Doepfer A-149-1 Quantized Stored Random Voltages Module
Cat: 745776 Rel: 09 Sep 19
 
12HP random voltage generator for Eurorack, with 4 CV outputs
Notes: Module A-149-1 is the first module of the A-149-x range. In this group we present by popular request several functions of Don Buchla's "Source of Uncertainty 265/266" (SOU) modules that cannot be realized with existing A-100 modules. Many functions of Buchla's 265 and 266 SOU can be realized with existing A-100 modules. For details please refer to A-100 patch examples.

Module A-149-1 has available four different analogue random control voltages that are generated in different ways.

The "Quantized Random Voltages" section has available 2 CV outputs: "N+1 states" and "2N states". N is an integer number in the range 1...6 that can be adjusted with the manual control (Man N) and an external control voltage CVN with attenuator. Whenever the rising edge of the input clock signal (Clk In) appears a new random voltage is generated at the N+1 resp. 2N output. The N+1 output is capable to generate N+1 different voltage levels (or states), the 2N output up to 2N different states. If for example N is set to 4 the N+1 output generates up to 5, the 2N output 16 different states. The voltage steps of the 2N output are adjusted to 1/12 V in the factory. Consequently, exact semitones can be obtained in combination with a VCO. The voltage steps of the n+1 output are adjusted to 1.0 V in the factory corresponding to octave intervals in combination with a VCO. For each output a trimming potentiometer is available on the pc board that enables the user to select other voltage steps for the output in question.

Even the "Stored Random Voltages" section has 2 stepped CV outputs available: one with even voltage distribution of the max. 256 output states and second one with adjustable voltage distribution probability. The distribution probability is adjusted by a manual control (Man D) and an external control voltage CVD with attenuator. With the control set fully counter-clockwise most of the random voltages will be low magnitude but even medium and high magnitude voltages may appear but with smaller probability. As the control is turned to the right (or a positive control voltage appears at the CVD input) the distribution moves through medium to high magnitude voltage probability. The symbol at the lower jack socket shows this coherence graphically. The voltage range is 0...+5V for both outputs of the "Stored Random Voltages" section. For each output a trimming potentiometer is available on the pc board that enables the user to select another voltage range for the output in question.

The A-149-1 can be extended by 8 random digital voltages with the A-149-2 Digital Random Voltages module.
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Doepfer A-149-2 Digital Random Voltages Module
Cat: 745777 Rel: 10 Sep 19
 
Expansion module to the A-149-1
Notes: A-149-2 is an extension module for A-149-1. It makes available 8 digital random voltages (i.e. only low/high states like a gate signal). The outputs are controlled by the "Quantized Random Voltages" section of the assigned A-149-1 and correspond to the 8 digital outputs of the shift register that is used to generate the Quantized Random Voltages. As the alteration of the A-149-2 outputs is clock controlled by the Clk In of the "Quantized Random Voltages" section of the A-149-1 the A-149-2 can be used to create random rhythmical sequences.

The A-149-2 requires the A-149-1 and has to be mounted directly to the left or right of the A-149-1 as an internal ribbon cable connection has to be established between A-149-1 and A-149-2.
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Doepfer A-150 Dual Voltage Controlled Switch Module
Cat: 745778 Rel: 10 Sep 19
 
Two independent voltage controlled switches in one module - 4HP
Notes: Module A-150-1 (Dual VCS) contains two separate voltage-controlled switches.

Each switch has a control voltage input, a common Out / Input, and two In / Outputs. The switches are bi-directional: they can work in both directions, so can connect one input to either of two outputs, or either of two inputs to one output. Voltages in the range -8V...+8V at the O/I resp. I/O sockets can be processed by the module.

Two LEDs show which in / output is active (i.e. which is connected to the common out / input).
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Doepfer A-152 Voltage Addressed Track & Hold, Analog Shift Register & Octal Switch Module
Cat: 745781 Rel: 09 Sep 19
 
Complex switch/multiplexer unit - 16HP
Notes: Module A152 is a very useful switching and T&H module. It combines a voltage addressed 1-to-8 multiplexer and 8 fold T&H that can be used as kind of an analogue shift register too. The active in/output is displayed by a LED. The digital output of the currently addressed step outputs "high". The remaining digital outputs are low.

Instead of voltage control even clock/reset controlled addressing of the active step is possible. The rising edge of each clock signal causes an advance to the next state. The rising edge of the reset signal resets to step 1.

The sum of the voltages coming from the manual Address control and the CV input define the currently addressed step of the 3 sub-devices. If the module is controlled by clock and reset the control voltage has to remain unchanged as the CV control has priority over the clock/reset control (e.g. simply turn the CV control fully counter-clockwise and do not touch the Address control knob).

Sub-device #1 is the bidirectional 8-fold multiplexer (kind of an electronical 8-fold rotary switch). Bidirectional means that it works into both directions like a mechanical rotary switch: the common socket may work as an output that is connected to one of the 8 inputs that are e.g. connected to modulation or audio sources. But the common socket may even function as input. In this case the signal applied to the common socket is output to the currently addressed single socket. The voltage range of the in/outputs to be switched is the full A-100 voltage range -12V....+12V. All A-100 signals can be switched without any restrictions.

Sub-device #2 is the addressed 8-fold T&H. The signal at the common T&H input is connected to the addressed T&H output. As soon as a new output is addressed the last voltage is stored at the output (Track&Hold function). The T&H section of the A-152 allows the emulation of the "toggling T&H" function of the Buchla module 266 "Source of Uncertainty". Only the first two T&H outputs of the A-152 are required for this application. This unit can be used also as kind of an analogue (shift) register. The difference to a "real" analogue shift register is that the sampled output voltages are not shifted to the next output but remain allocated to the same output. But in some cases (e.g. controlling the pitch of 3 VCOs by 3 output voltages of the A-152) the result is the same.

Sub-device #3 is the digital output section. The digital output of the currently addressed turns to "high". All other digital outputs are low. The digital outputs can be used to trigger e.g. envelope generators or to control the reset input in the clocked mode to reduce the number of addressed stages.
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Doepfer A-154 Sequencer Controller Module
Cat: 745782 Rel: 09 Sep 19
 
Controller unit for the A-155 sequencer
Notes: Module A-154 is a supplement to the A-155 Analog/Trigger Sequencer module. It offers a lot of new features that are not available in the basic control unit of the A-155. The A-154 is used to replace the control unit of one or two A-155, i.e. the section marked "Control" with Start / Stop / Step / Reset buttons and inputs in the upper left corner of the A-155 front panel. If the A-154 is used to control the A-155 the control section of the A-155 is put out of action.

These are the features of the A-154:

Several running modes: forward, backward, pendulum, random, CV controlled step addressing. All modes are available as loop or one-shot.

LED display of the 5 different current modes and one LED for loop/one-shot display

Manual and voltage controlled selection (with attenuator) of the running mode. If no external control voltage is applied one of the 10 modes (5 modes x 2 loop/one-shot) is simply selected with a rotary knob. The CV input with attenuator is used to modulate the running mode with an external control voltage (digital high/low CV to switch between two modes or continuous analogue CV to sweep through different modes). With the combination of manual control and CV with attenuator it is possible e.g. to use only two neighbouring modes (e.g. forward/backward) or sweep through all possible running modes

Manual and voltage controlled selection (with attenuator) of first and last step of the sequence. The range is step 1...8 in 8 step mode resp. 1...16 in 16 step mode

If the running mode "CV Controlled Step Address" is selected the First Step section is used to determine the active sequencer step. Consequently manual and voltage controlled selection (with attenuator) of the active step is possible: the active step can be set by hand with the first step manual control and then modulated by an external control voltage (e.g. LFO, Random, S&H, Theremin, Light CV source, Joy Stick) at the first step CV input (with attenuator).

An internal voltage controlled clock generator with manual and CV control (with attenuator) is available. The output of the clock generator is displayed with a LED and is used as sequencer clock provided that no external clock signal is connected to the Clock In socket (normalled socket). If the CV input of the Clock section is connected to one of the analogue outputs of the sequencer the time for each step can be set separately. Even jumps (or skipping) will be possible as we will introduce the feature that a very short clock pulse will be generated if the control voltage exceeds a certain value. For example the gate row of the A-155 can be used to obtain skipping of steps: the gate output simply has to be connected to the CV input of the A-154 clock generator. If the corresponding switch of the A-155 is set correspondingly in the gate row the step will be skipped.

Manual and voltage controlled (with attenuator) pulse width (PW) of the clock signal. This features can be used to obtain a different gate length for each step: e.g. one of the CV outputs of the A-155 can be used to control the PW. With a PW control voltage coming from a LFO/random/S&H the gate length will change automatically. CV coming from Theremin A-178, ribbon controller A-198, light controlled CV A-179, joy stick A-174 are other ways to control the gate length.

8/16 step mode: A toggle switch us used to select 8 or 16 steps. The "16 step" mode requires two A-155 and one or more voltage controlled switches (e.g. A-150-1 or A-150-8). The voltage controlled switches are controlled by the "A3" output of the A-154. This output remains "low" as long as the active step is in the range 1...8 and turns to "high" in the range 9...16. The voltage controlled switches are used to switch between the CV/trigger/gates outputs of the first A-155 (step 1...8) and the second A-155 (step 9...16). In the A-154 user's manual the corresponding patch is shown.

If two A-155 are used they can work in parallel (8 steps) or serial (16 steps). The 8/16 steps switch determines if the 8 step mode (one A-155 or two A-155 in parallel) or the 16 step mode (two A-155 serial) is chosen. Both modes work with CV controlled step addressing too (see below). In 8 step mode only the steps 1...8 are addressed, in 16 step mode the steps 1...16. For serial operation an additional VC switch (A-150) is required - as mentioned above.
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Doepfer A-154v Sequencer Controller Module (vintage edition)
Cat: 745783 Rel: 09 Sep 19
 
Controller unit for the A-155 sequencer
Notes: Module A-154 is a supplement to the A-155 Analog/Trigger Sequencer module. It offers a lot of new features that are not available in the basic control unit of the A-155. The A-154 is used to replace the control unit of one or two A-155, i.e. the section marked "Control" with Start / Stop / Step / Reset buttons and inputs in the upper left corner of the A-155 front panel. If the A-154 is used to control the A-155 the control section of the A-155 is put out of action.

These are the features of the A-154:

Several running modes: forward, backward, pendulum, random, CV controlled step adressing. All modes are available as loop or one-shot.

LED display of the 5 different current modes and one LED for loop/one-shot display

Manual and voltage controlled selection (with attenuator) of the running mode. If no external control voltage is applied one of the 10 modes (5 modes x 2 loop/one-shot) is simply selected with a rotary knob. The CV input with attenuator is used to modulate the running mode with an external control voltage (digital high/low CV to switch between two modes or continuous analog CV to sweep through different modes). With the combination of manual control and CV with attenuator it is possible e.g. to use only two neighbouring modes (e.g. forward/backward) or sweep through all possible running modes

Manual and voltage controlled selection (with attenuator) of first and last step of the sequence. The range is step 1...8 in 8 step mode resp. 1...16 in 16 step mode

If the running mode "CV Controlled Step Address" is selected the First Step section is used to determine the active sequencer step. Consequently manual and voltage controlled selection (with attenuator) of the active step is possible: the active step can be set by hand with the first step manual control and then modulated by an external control voltage (e.g. LFO, Random, S&H, Theremin, Light CV source, Joy Stick) at the first step CV input (with attenuator).

An internal voltage controlled clock generator with manual and CV control (with attenuator) is available. The output of the clock generator is displayed with a LED and is used as sequencer clock provided that no external clock signal is connected to the Clock In socket (normalled socket). If the CV input of the Clock section is connected to one of the analog outputs of the sequencer the time for each step can be set separately. Even jumps (or skipping) will be possible as we will introduce the feature that a very short clock pulse will be generated if the control voltage exceeds a certain value. For example the gate row of the A-155 can be used to obtain skipping of steps: the gate output simply has to be conneted to the CV input of the A-154 clock generator. If the corresponding switch of the A-155 is set correspondingly in the gate row the step will be skipped.

Manual and voltage controlled (with attenuator) pulse width (PW) of the clock signal. This features can be used to obtain a different gate length for each step: e.g. one of the CV outputs of the A-155 can be used to control the PW. With a PW control voltage coming from a LFO/random/S&H the gate length will change automatically. CV coming from Theremin A-178, ribbon controller A-198, light controlled CV A-179, joy stick A-174 are other ways to control the gate length.

8/16 step mode: A toggle switch us used to select 8 or 16 steps. The "16 step" mode requires two A-155 and one or more voltage controlled switches (e.g. A-150-1 or A-150-8). The voltage controlled switches are controlled by the "A3" output of the A-154. This output remains "low" as long as the active step is in the range 1...8 and turns to "high" in the range 9...16. The voltage controlled switches are used to switch between the CV/trigger/gates outputs of the first A-155 (step 1...8) and the second A-155 (step 9...16). In the A-154 user's manual the corresponding patch is shown.

If two A-155 are used they can work in parallel (8 steps) or serial (16 steps). The 8/16 steps switch determines if the 8 step mode (one A-155 or two A-155 in parallel) or the 16 step mode (two A-155 serial) is chosen. Both modes work with CV controlled step addressing too (see below). In 8 step mode only the steps 1...8 are addressed, in 16 step mode the steps 1...16. For serial operation an additional VC switch (A-150) is required - as mentioned above.

The functions of the Start/Stop/Step/Reset buttons and inputs are the same as for the "old" control unit of the A-155:

A high level at the Start input or operating the Start button starts the sequence from the momentarily addressed step. Not working in "CV controlled step address" mode.

A high level at the Stop input or operating the Stop button stops the sequence (the last active step remains addressed). Not working in "CV controlled step address" mode.
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Doepfer A156v Dual Quantizer Module (vintage edition)
Cat: 745785 Rel: 10 Sep 19
 
Dual quantizer for CV's, converting a continuous positive input voltage into a stepped output voltage - 8HP
Notes: Module A-156 is a Dual Control Voltage Quantizer. A quantizer converts a continuous control voltage in the range 0...+10V into a stepped output voltage in the same voltage range (i.e. only certain voltages occur). Normally 1/12 V steps are used to obtain semitone steps. Quantizer 2 of the A-156 allows has more sophisticated quantizing modes like major scale (i.e. only voltages corresponding to the major scale), minor scale, major chord, minor chord, fundamental + fifth and addition of seventh or sixth when chords are selected. Only those voltages appear at the CV output which comply with the selection rule (e.g. minor chord with seventh). The mode setting of quantizer 2 is done with 3 switches (1-0-1 type with middle position). From the factory quantizer 1 is working in the semitone mode. But there is a jumper on the pc board that can be changed so that even quantizer 1 uses the same scale as quantizer 2.

For each quantizer the following in/outputs are available:

- Control voltage input (CV In): The input for the continuous voltage to be quantized
- Control voltage output (CV Out): The output of the quantized voltage
- Trigger input (Trig.In): If this jack is left open the quantizer is working permanently. If a rectangle voltage is applied quantisation happens only at the rising edge of the signal (e.g. from an LFO or MIDI-to-Sync interface). Thus the quantizing can be synchronized with other events
- Trigger output (Trig.Out): Whenever a quantisation happens (i.e. a new voltage is generated at the CV Out) a positive pulse occurs at this output. It may be used to trigger an envelope generator (ADSR) or for triggering other modules (sequential switch A-151, trigger divider/sequencer A-160/161, trigger delay A-162, ...). If none of these functions are used the jack is left open

On top of that the A-156 is provided with a common transpose CV input having an additive effect on both quantizers. This input is quantized in semitone steps. A typical application is the transposition of a sequence generated by the A-155 by a second control voltage (e.g. coming from the MIDI-CV interface A-190).

Typical applications:

- Quantizing the CV sequence generated by an A-155 (semitone, only major scale, only minor scale and so on)
- Quantizing the voltage coming from the Trautonium Manual / Ribbon Controller A-198, Theremin A-178 or Light-to-CV module A-179 to get accurate semitones or major/minor scale tones
- Arpeggio-like effects with LFO, random, noise, envelope generators as CV sources (for negative or symmetrical voltages an offset must be added, e.g. with the offset/attenuator module A-129-3, to obtain positive voltages for the A-156 input)
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Doepfer A-157 Trigger Sequencer Module Set
Cat: 745786 Rel: 09 Sep 19
 
52HP 8-channel, 16-step-button Eurorack step sequencer with breakout modules
Notes: A-157 is a trigger sequencer subsystem that generates eight trigger signals controlled by a 8x16 LED/button matrix (some customers call it "Miniature Schaltwerk" as it is based on the same matrix as the no longer available Schaltwerk).
The subsystem contains three modules:

A-157-1: 8 x 16 LED/button matrix and function addressing buttons/LEDs
A-157-2: Trigger Output module
A-157-3: Control Inputs module

The LED/button matrix module A-157-1 is the core of the subsystem. It is used to set or reset the trigger event on each of the 16 steps of each of the 8 rows. In addition the buttons and LEDs of the matrix are used for other functions too (like setting the first and last step of each row or addressing the preset memory).

The Trigger Output module A-157-2 outputs the 8 trigger signals and has an LED display for each trigger available.

The Control Inputs module A-157-3 has manual controls and trigger inputs available for the basic control functions start, stop, reset and clock. In addition four functions inputs are available which will be used in future firmware versions to assign these inputs to special functions (e.g. shifting a row left or right by means of an external gate/trigger signal or a second set of start, stop, reset and clock for individual rows).
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