Doepfer Wheel Electronic - Manual (Page 4)

Page 4 Wheel Electronic V1.0 User's Guide
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.
• Typical examples for analog controls connected to the pin headers ST1…ST4 are
modulation wheels, foot controllers, joy sticks, rotary potentiometers, faders, drawbars,
rotary switches (with resistor chains connected between GND and +5V to generate several
analog voltages), ribbon controllers, pressure sensors, light depending resistors or breath
controllers.
• Typical examples for the switching control connected to the pin header ST5 are momentary
or toggling foot switches or any other switches. But even more unusual parts like photo
diodes or photo transistors can be used.
• 16 so-called presets are available. A preset defines the assignments of Midi messages to
the five control inputs ST1…ST5. The actual preset is selected by a group of jumpers.
Different combinations of Midi control change, pitch bend and (monophonic) after touch
messages are available (pitch bend and after touch are no control change messages). If in
the following the term controllers are used this includes pitch bend and after touch too.
• If none of the presets is suitable for the application other combinations of Midi controllers
can be programmed upon request as a special design. Please contact Doepfer
Musikelektronik GmbH for details like additional charges or delivery time (e.g. via email to
[email protected] or [email protected]).
• For each of the four analog inputs a jumper is available to select if the full voltage range
(0...+5V) or an adjustable voltage range (0…+V with V+ = +3...+5V) is used for
measurement. This measure is necessary e.g. for modulation or pitch wheels, foot
controllers or joy sticks that do not cover the complete angle of rotation. If such an element
is connected to GND and +5V the maximal output voltage is much less than +5V (e.g. +3V
only). Even breath controllers (e.g. Yamaha BC-1/2/3) output only about +3.5V maximal
voltage. If an electronics is used that analyses the full voltage range 0...+5V the higher Midi
data values are missing. A high resolution trimming potentiometer is available to adjust the
limited voltage range.
• If an element is assigned to Midi pitch bend a "plateau" is used in the middle of the
voltage/data range (data value 64). This feature is meaningful in combination with spring-
loaded wheels or joy sticks as due to mechanical tolerances the exact center position is not
always reached
• Even voltages sources can be used instead of the controls provided that the voltages
applied are strictly within the range 0...+5V (referenced to WE GND)! Voltages beyond this
range will destroy the electronics !
• The four analog controls are connected to four single row pinheaders (three pins each). The
switching control is connected to a pinheader with two pins. Cable sets with suitable female
connectors are available. In this way the controls might be disconnected from the electronics
very easily.
• WE is equipped with Midi In and Midi Out. The incoming Midi messages are merged to the
data generated by WE provided that the Midi data does not exceed a certain amount. In this
way several WE can be linked together to obtain larger controller arrays
• WE is available only as an assembled and tested pc board (about 59 x 56 x 25 mm).
• An external power supply (7-12VDC@min. 100mA) is required for the WE. It is included for
all shipments within Germany (230V version with European mains plug). For shipments
outside Germany please ask your local representative or dealer.
• We do not offer a suitable housing as this would have to be completely different for various
combinations of controls.