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DOEPFER System A-100 Midi-to-CV/Gate A-190-2

Fig. 1: Schematics

1. Introduction

Module A-190-2 is an economically priced alternative to the

Midi-CV/SYNC interface A-190-1. It can be used in all cases

where the additional features of the A-190-1 are not

required (e.g. clock output, start/stop output). A-190-2 is the

modular version of the MCV4 interface.

These are the most important features of the A-190-2:

• Midi-to-CV/Gate interface

• Gate output 0/+5V

• CV1: voltage derived from incoming Midi note

messages (0...+5V / 5 octaves), the glide control

affects this CV output

• CV2: voltage derived from incoming Midi pitch bend

messages (-2.5 ... +2.5V)

• CV3: voltage derived from the multiplication of

incoming Midi volume messages and the velocity

data of the note messages (0...+5V)

• CV4: voltage derived from a freely adjustable Midi

control change message (0...+5V)

• Midi channel, reference note for 0V CV1 and the

midi control change number for CV4 are adjusted by

means of the learn button.

• Glide control: portamento/slew limiter function for

CV1

By means of two jumpers CV1 and Gate can be connected

to the corresponding lines of the A-100 bus.

Summary of content (13 pages)

PAGE 1
System A-100 DOEPFER Midi-to-CV/Gate A-190-2 1. Introduction Module A-190-2 is an economically priced alternative to the Midi-CV/SYNC interface A-190-1. It can be used in all cases where the additional features of the A-190-1 are not required (e.g. clock output, start/stop output). A-190-2 is the modular version of the MCV4 interface. These are the most important features of the A-190-2: • • • • • • • • Fig.
PAGE 2
Midi-to-CV/Gate A-190-2 System A-100 2. Overview Controls / Displays: 1 Learn: 2 Glide: 3 Gate: ! Learn (momentary switch) Glide Control for CV output "Note" Gate / Learn LED In- / Outputs: 1 2 " 3 § ! " § $ % & Midi In: Gate: CV Note: CV Pitch: CV V/V: CV Ctrl.: Width: 6 HP $ Current: 50 mA % & Fig.
PAGE 3
DOEPFER System A-100 3. In- / Outputs ! Midi input The Midi input of the A-190-2 is connected to the Midi output of the Midi transmitter that is used to control the A-190-2 (e.g. Midi keyboard or sequencer). " Gate output The Gate outputs turns "high" when a valid Midi note on message is recognized by the A-190-2. It turns back to "low" when the corresponding note off message occurs. The Gate levels are +5V (high state) and 0V (low state). If desired the gate polarity can be inverted.
PAGE 4
Midi-to-CV/Gate A-190-2 System A-100 DOEPFER Important note: The module comes with an installed CV jumper, i.e. one has to remove the jumper if e.g. an A-190, A-185-1 or A-185-2 is already connected to the CV line of the same bus board! If the A-190-2 should be used as CV source for the A-100 bus the CV connection of any other CV source (e.g. A-190-1, A-185-1 or A-185-2) has to be removed.
PAGE 5
DOEPFER System A-100 4. Controls 1 Learn This is a momentary switch that is used to adjust the parameters of the A-190-2 in combination with Midi note, control change or program change messages (e.g. Midi channel, reference note, control change number, gate polarity, retrigger on/off, key assign mode). Details in chapter 5. The learn button is also used to reset the module (i.e. to call up the factory settings). For this the button has to be operated during power on of the A-100 system.
PAGE 6
Midi-to-CV/Gate A-190-2 System A-100 5. Operation To adjust the A-190-2 parameters one has to enter the Learn mode and send the regarding Midi messages to the module from the Midi transmitter while the A-190-2 is in learn mode. To enter the learn mode one has to press the learn button and hold it pressed down for about one second. The one-second-delay was programmed to prevent the unintentional release of the learn mode. Whenever the LED is flashing without incoming Midi messages the learn mode is active.
PAGE 7
DOEPFER System A-100 Midi-to-CV/Gate A-190-2 Function Midi channel/reference for CV1=0V CV3 velocity off CV3 velocity on CV4 velocity off CV4 velocity on Retrigger: off Retrigger: on Trigger polarity: normal Trigger polarity: invertet CV3 velocity mode 127 steps Midi message Note on Program Change #1 Program Change #2 Program Change #3 Program Change #4 Program Change #5 Program Change #6 Program Change #7 Program Change #8 Program Change #11 Note (1) (2) (2) (2) (2) (3) (3) (4) (4) (5) CV3 velocity m
PAGE 8
Midi-to-CV/Gate A-190-2 System A-100 Notes (1) Midi channel/reference for CV1=0V In case of an incoming note event in the learn mode the note number and the channel of the event are taken over as the new reference note and Midi channel. The reference note is the Midi note number that belongs to 0V CV1 output. In practice you simply enter the learn mode and press the key on your Midi keyboard that should belong to 0V CV1.
PAGE 9
DOEPFER System A-100 (3) Retrigger on/off With this parameter one can select whether the gate is reset for a few milliseconds when playing legato (i.e. playing a new note on the keyboard while the key of the former note is still pressed). The factory default setting is retrigger off. Additionally the Midi controllers LEGATO (controller #68) and SUSTAIN (controller #64) affect the gate output in the usual manner. (4) Gate polarity With this function the gate polarity can be changed.
PAGE 10
Midi-to-CV/Gate A-190-2 System A-100 DOEPFER (7) CV Characteristics Temporary parameter changes With programm change #19 and #20 one can select between V/Octave and Hz/V characteristics for the CV1 output. Within the A-100 this features is not required because all VCOs and VCFs use V/Oct only. Only if the A-190-2 is used to control other equipment this function might be useful. V/Octave is used by most of the synthesizer manufacturers (Moog, ARP, Oberheim, Roland, Sequential Circuits, Doepfer).
PAGE 11
DOEPFER System A-100 Midi-to-CV/Gate A-190-2 6. User Examples 6.1. Simple synthesizer standard patch with one envelope generator This is a simple synthesizer patch with one VCO A-110 that is processed by a VCF (A-124 Wasp filter in this example, but any other filter may be used) and two VCAs (Dual VCA A-132-3). The first VCA is controlled by the envelope of the ADSR A-140. The second VCA is controlled by the Velocity/Volume CV of the A-190-2 and used for a Midi controlled overall loudness.
PAGE 12
Midi-to-CV/Gate A-190-2 System A-100 DOEPFER 6.2.
PAGE 13
System A-100 DOEPFER Midi-to-CV/Gate A-190-2 Appendix • Function of the jumpers/pin headers • Position of the trimming potentiometers for CV1 scale for daisy-chaining of several A-190-2 Midi out (to following A-190-2) Jumper Gate → Bus Jumper CV → Bus Midi in (from preceeding A-190-2) Trimming potentiometer for CV scale 13