DOEPFER MUSIKELEKTRONIK GMBH WHEEL ELECTRONIC (Universal Midi Control Electronics for Modulation Wheels, Foot Controllers , BreathController, Joy Sticks etc.) V1.
Table of contents Table of contents ...................................................................................................................................... 2 Electrical safety / EMC compatibility......................................................................................................... 2 Warranty ................................................................................................................................................... 3 Introduction.......................
Warranty • • • • • • • • • • Applying any negative voltage (< 0V) or positive voltage above +5V (> +5V) to one of the five inputs ST1…ST5 will destroy the circuit ! If potentiometers and/or switches are connected between GND and +5V of WE as described in this manual no problems will occur.
Introduction • • • • • • • • • • • • • • WE is an universal DIY kit to built your own Midi control box. Up to four analog controls and one switching control can be connected to WE transmitting five different Midi messages. The controls (e.g. modulation wheels) are not included but have to be purchased by the customer in addition. We have suitable parts available as spare parts.
Connection and Installation Please pay attention to the following notes ! Electronic basic knowledge is required to install the WE electronics and to connect the controls. If you are not sure whether your knowledge is sufficient please consult an expert. We cannot take back modules that became defective because of wrong installation or wrong connection of the controls or voltages. We also cannot take back modules or cables which have been soldered by the user.
Overview: Wheel Electronic Connectors and Controls (8) jumper area JP1 for adjustment of Midi channel and preset (9) jumper area JP2 for voltage range (3) Midi In (BU1) 8 7 6 5 4 3 2 1 (4) LED control 1 2 3 4 5 (2) Midi Out (BU2) (5) pin headers for analog controls (ST1...ST4) Page 6 (6) pin header for switching control (ST5) Wheel Electronic V1.
Midi In Socket (3) The WE features a Midi input. This input may be connected to another Midi device (e.g. Midi keyboard). The incoming Midi data are merged to the data generated by WE. The Midi input may be used as well for daisy-chaining several WE. The Midi input of WE is not suitable for large amounts of Midi data (e.g. SysEx strings or Midi messages coming from an computer sequencer) as the WE has only a small Midi buffer. In case of large amounts of incoming Midi data loss or delay of data may occur.
GND +5V GND measuring input +5V measuring input Connecting a rotary potentiometer to ST1…ST4 (valid for potentiometers of modulation wheels, foot controllers and joysticks too) Connecting a fader potentiometer to ST1…ST4 Linear potentiometers with resistance values 4k7 ... 100k can be used. We recommend 10k (linear). Important: Unused measuring inputs have to be connected to GND or +5V.
In both cases an additional 10k resistor is required (possible range 4k7 to 100k) to pull the analog input to a defined state during the switch is open. • Version 1: The resistor is soldered between GND and the measuring input . This way the input is pulled to GND ( =0V corresponding to Midi data 0) as long as the switch is left open. When the switch is closed the voltage jumps to +5V corresponding to Midi data 127. • Version 2: The resistor is soldered between +5V and the measuring input .
Controls and Operation In addition to the elements connected to ST1…ST5 WE has these controls available: • • • Jumper area JP1 for adjustment of Midi channel and preset selection Jumper area JP2 for voltage range selection and polarity of the foot switch Trimming potentiometer P1 for adjustment of the reduced voltage range +V Function of the jumper area JP1 The jumper area JP1 is made of a double row pin header with 16 pins that can be used to install up to 8 jumpers.
The following table shows the relation between the settings of the jumpers 5…8 of JP1 and the corresponding preset: Preset # 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 5 Jumper # 6 7 8 ST1 PIT PIT VOL MOD 1/2 SUST PAN Midi function of ... ST2 ST3 ST4 MOD VOL AT MOD VOL BC (*) VOL+1 VOL+2 VOL+3 68 VOL EXP 3/4 5/6 7/8 SOST SOFT VOL EXP VOL BAL ST5 SUST SUST SUST SUST SUST SUST SUST 5 = jumper installed The factory setting is shaded grey (preset # 1).
• • • Control change # 1 is used for fast/slow, # 68 for on/off. Please refer to the B4 manual for details. In addition volume and expression are available. Preset # 5 is a special preset for joy sticks. Starting from the center position (i.e. about +2.5V control voltage) for up/down and left/right movement of the joy stick different Midi control changes are used (1/2, 3/4, 5/6 and 7/8). Preset # 6 is a special preset for triple (or dual) foot controllers.
Function of the trimming potentiometer P1 The trimming potentiometer P1 is used to adjust the reduced voltage range V+. Any voltage between 0V and +5V can be adjusted though only voltages in the range +3...+5V should be used. Reference voltages below +3V cause malfunction of the analog-to-digital converters though nothing can be damaged. The reduced voltage V+ becomes valid for an input if the corresponding jumper of JP2 is removed (see above table).
Check list In case that your WE installation does not work at the first go please check the following points: • Does the power supply work correctly ? • After power on the LED has to turn on ! Otherwise the AC adapter used is not suitable, has the wrong polarity, voltage or current, or does not work. The correct polarity is: outside ring = GND, inside lead = +7...12V.
Extent of delivery The WE delivery contains the following parts: • • • • • Wheel Electronic pc board, assembled and tested Power Supply (230V mains voltage, European type mains plug, output voltage range 7...12V, current min.
Pictures of the wired wheel box Both potentiometers have to be turned into the correct positions because the potentiometers may be mounted at different positions from the factory.
