MATRIXSYNTH: New Doepfer Eurorack Modules

Sunday, December 03, 2017

New Doepfer Eurorack Modules


"Module A-150-8 contains eight manually/voltage controlled switches. Each of the eight switches has a manual control button (Man.), a control voltage input (CV), a common Out / Input (O/I), and two In / Outputs (I/O1, I/O2). The switches are bi-directional, i.e. they can work in both directions, so can connect one input to either of two outputs, or either of two inputs to one output. Two LEDs show which in / output is active (i.e. which is connected to the common out / input). In addition the LEDs are used for the programming of the module:

For each unit the operating mode can be selected: Toggle or Level controlled. In Toggle mode the rising edge of the CV input or operating the manual control button changes the state of the switch. In Level mode the switch state is defined by the voltage applied to the CV input (low voltage = I/O1, high voltage = I/O2) or by the state of the manual control button (not pressed = I/O1, pressed = I/O2). The modes are programmed very easily: Operating the Toggle/Level button of the program section displays the current state of each switch with the LEDs: left LED on = Toggle mode, right LED on = Level mode. Operating the manual control button of the switch in question changes the toggle/level mode while the Toggle/Level button of the program section is operated. During the programming possibly patched CV signals have to be removed as the CV signals would interfere with the manual operating buttons during the programming process.

In addition it's possible to define master/slave groups. In such a group the upper unit (= master) controls also the state of the following switches provided that they are defined as slaves. Master/slave programming is also very simple: Operating the Master/Slave button of the program section displays the current state of each switch with the LEDs: left LED on = Master, right LED on = Slave. Operating the manual control button of the switch in question changes the master/slave mode while the Master/Slave button of the program section is operated. During the programming possibly patched CV signals have to be removed as the CV signals would interfere with the manual operating buttons during the programming process.
When all 8 units are defined as master all switches are independent from each other. If for example the sequence is MSSSMSMS the control unit of the first switch also controls the switches 2, 3 and 4. The control unit of switch 5 also controls the switch 6, and the control unit of switch 7 also controls the switch 8. The current states of the slave switches are overwritten by the state of the master switch.

Technical note: To protect the electronic switches in case of an unsuitable patch (e.g. connection of two outputs) a 1k protection resistor is inserted into the O/I line of each switch. If control voltages used for VCOs are switched this may cause a small voltage drop and lead to undesired audible detuning. For this application we recommend to insert a CV buffer between A-150-8 and the VCO(s), e.g. the Buffered Multiple A-180-3 or the Precision Adder A-185-2. Integrating the buffers into the module A-150-8 was not possible because this would ruin the bidirectionality of the switches."


"A-180-9 is another simple but useful tool. It can be used to connect up to 14 signals between different cases by means of standard network cables (RJ45). These cables are available all over world smoothly in different lenghts and colors. From the factory two black network cables with 0.5 m length are enclosed.

The upper network connector is wired to the eight sockets 1-8, the lower to the six sockets A-F. That way it's possible to pre-patch different cases and connect signals, that are required in all cases (e.g. clock, start/stop, master CV) by means of one or two cables only instead of 14 individual patch cables. When only eight signals are required only the upper network connector is required and the sockets 1-8 are used. When more than eight signals have to be patched both network connectors have to be used. It's also possible to wire the upper and lower network to different cases (i.e. signals 1-8 to external case #1 and signals A-F to external case#2).

The module is fully passive (no power supply required) and simply wires the 14 sockets to 14 pins of the network connectors."


First posted here in April, additional details follow:

"A-111-4 contains four precision VCOs and has individual controls, inputs and outputs for each VCO available as well as a common control and output unit. After all the A-111-4 is very similar to four A-111-3 without LFO mode but built in output mixers for the three waveforms, and a master unit for all four VCOs.

Controls, inputs and outputs for each of the four VCOs:
1V/Octave CV input
Octave switch (+1 / 0 / -1 octave)
Tune control (range internally adjustable by jumpers: ~ 2 semitones / ~ 1 octave / ~ 4 octaves)
Modulation CV input
Modulation destination:
upper position: exponential frequency modulation (XM)
lower position: linear frequency modulation (LM) or pulsewidth modulation of the rectangle (PM), selectable via internal jumper
Frequency Modulation (FM) or Pulsewidth Modulation of the rectangle (PWM)
Modulation intensity
Triangle output
Sawtooth output
Rectangle output (about 50% without external PWM)
Sync input (hard or soft sync internally selectable via jumper, CEM3340 hard sync type)
min. 10 octaves range (with appropriate external CV)
CEM3340 based VCO (triangle core)
each VCO has it's own separate internal +/- power supply for each for best stability and the prevention of unwanted synchronisation of the VCOs
Controls, inputs and outputs of the master section:
1V/Octave CV input
Octave switch (+1 / 0 / -1 octave)
Tune control (range internally adjustable by jumpers: 2 semitones / 1 octave / 4 octaves)
Frequency Modulation CV input (FM)
FM intensity
Triangle sum output
Sawtooth sum output
Rectangle sum output
as soon as the single waveform output of a VCO is patched this waveform of the VCO in question is removed from the sum (this function can be turned off for each single output socket by means of solder brigdes on the pc board, i.e. the sum contains then all signals independent of the patching of the single output)
CV output (outputs the sum CV that is used to control all four VCOs)
bus CV (selectable via jumper)
Typical applications:
fat sounding monophonic VCO with the possibility to adjust any intervals
paraphonic patches in combination with the polyphonic CV interface A-190-5 (all four VCOs processed by one VCF/VCA)
full polyphonic patches in combination with the polyphonic CV interface A-190-5 and four complete VCF/VCA sections
complex VCO patches with up to four VCOs by means of the frequency modulation features (exponential an linear) and the sync functions
The following document shows the positions and functions of the jumpers and trimming potentiometers of the module: A111_4_trimming_potentiometers_and_jumpers.pdf
Pay attention that faulty adjustments caused by the user are not covered by warranty. In this case the working time required to re-establish the correct adjustment has to be charged. This warning does not apply to the change of the jumper positions."


First posted here in April, additional details follow:

"A-173-1/2 is a module combo that is used to generate a manually controlled 1V/Octave CV signal and up to 15 manually controlled gate/trigger signals. Typical applications are the transposition of a sequence by means of the CV output (without the need of an external keyboard and CV interface) and the manual generation of gate signals for start, stop, envelope generator triggering and other trigger tasks.

A-173-1 is the transmitter module and is made of a 1 ½ octaves micro keyboard and a three-position octave switch.

A-173-2 is the receiver module and generates several gate/trigger signals and a 1V/Oct. CV signal. The upper section of the module is used for the gates which are controlled by the corresponding buttons of the A-173-1. Each output can be programmed as gate (pressing/releasing the corresponding key turns the gate on/off) or toggle (pressing the corresponding key changes the state). The state of each output is displayed by an LED.
The lower section of the module is used the generate a 1V/Oct. CV signal and gate signal in the usual way.

By means of the learn feature of the A-173-2 (i.e. defining the key for 0V CV) a few buttons can be separated from the CV generation section so that these buttons only control gate/trigger outputs without affecting the CV. That way e.g. start/stop or other triggers become indepent from the CV section. For example it's possible to separate the lower five buttons (G to B) from the CV generation and use these buttons only for the generation of gate signals. For this the lower C has to be defined as lowest key for the CV generation.

The modules communicate via standard midi note on/off messages and are connected internally by means of a 2-wire cable. That way the modules can be mounted at different positions within the case."

No comments:

Post a Comment

PREVIOUS PAGE NEXT PAGE Home




©2017 Matrixsynth - All posts are presented here for informative, historical and educative purposes as applicable within fair use.
MATRIXSYNTH - EVERYTHING SYNTH
privacy policy