MKE Universal Midi Keyboard Electronics User's Guide © 2006 by Doepfer Musikelektronik GmbH Geigerstr. 13 82166 Graefelfing Germany Phone: #49 89 89809510 Fax: #49 89 89809511 Web Site: www.doepfer.de Email: sales@doepfer.
Electrical safety / EMC compatibility MKE is a so-called OEM product (OEM original equipment manufacturer) that cannot be used independently but has to be combined with additional electrical or electronical equipment to become a working device (suitable keyboard, pitch bend and modulation wheel, rotary or fader potentiometer, power supply, case/housing). The manufacturer of MKE does not know the final assembly of the complete device in which the MKE is used as a part of the complete device.
Contents Electrical safety / EMC compatibility ........................................................................................2 Warranty...................................................................................................................................2 Contents ...................................................................................................................................3 Introduction................................................................................
Introduction • • MKE is an universal Midi keyboard electronics, that can be used in combination with these devices: • standard keyboard (manufacturer: Fatar/Italy) with 2, 3, 4 or 5 octaves (connected to the female headers ST1 and/or ST2) • pitch bend wheel (special spring-loaded rotary potentiometer), connected to the pin header ST3 • modulation wheel (special rotary potentiometer), connected to the pin header ST4 • rotary or fader potentiometer for volume (Midi controller #7), connected to the pin heade
If you order MKE in combination with one of the keyboards we have available (Fatar TP7/2 octaves or TP/9 with 3, 4 or 5 octaves or organ keyboard TP/8O with 5 octaves) please do not forget to order the cable sets that are required to connect MKE to the keyboard. If MKE is ordered without keyboard please specify the length of the keyboard as the connectors are different for 2, 3, 4 and 5 octaves.
Connections (pcb bottom side) Please refer to the picture on the next page. (1) Power Supply The MKE does not have a built-in power supply. Instead it uses a plug-in type external power supply (AC adapter). One reason for this feature is electrical safety. Keeping danger voltages (main) out of the MKE increases the electrical safety. Therefore an external power supply of high quality and safety should be used. If the keyboard is used in Germany the external power supply has to be VDE approved.
(1) power supply 7-12V/100mA DC (BU3) (2) Midi Out (BU2) (3) Midi In (BU1) (4) keyboard connectors ST1A/ST1B and ST2 (5,6,7,8) connectors for • pitch bend (ST3) • modulation (ST4) • volumen (ST5) • sustain / after touch (ST6) MKE Version 1 User's guide V2 page 7 MKE
(1) power supply 7-12V/100mA DC (BU3) (2) midi out (BU2) (3) midi in (BU1) (10) sound card connector (ST7) (4) keyboard connectors ST1A/ST1B and ST2 (9) jumper ST8 additional pullup/down resistor for connector ST6 (Sustain/Aftertouch) connectors for • pitch bend (ST3) • modulation (ST4) • volumen (ST5) • sustain / after touch (ST6) MKE Version 2 MKE page 8 User's guide V2
(4) Keyboard connectors These two female connectors (AMP Micromatch, 16 resp. 20 pin) are used to connect the keyboard. They are compatible to the connectors used by the keyboard manufacturer Fatar/Italy in their 2, 3, 4 and 5 octave keyboards. To connect MKE and the keyboard ribbon cables with 16 or 20 pins and a suitable male connector on each end are used. The male connectors are equipped with code pins that have to fit into the corresponding holes in the pc boards of MKE and the keyboards.
potentiometers work as voltage dividers a wide range of resistance values for the potentiometers can be used (~ 5k ... 100k, linear recommended).
Another possibility is to connect a second normal potentiometer to ST6. In this case R12 has to be removed. The ccw terminal of the additional potentiometer is connected to GND (available at one pin of ST3/4/5), the wiper terminal is connected to pin 1 of ST6 and the cw terminal to pin 2 of ST6 (= +5V). This potentiometer can be used to generate any Midi controller or Midi after touch data. Even for ST6 the full voltage range 0 ... 5 Volt corresponds to the Midi data range 0 ... 127.
Controls (pcb top side) (9) Display (10) LEDs (11) buttons S1...S6 Display (9) The display is used to show the value of the currently selected parameter, i.e. Midi channel, transpose, control change number of ST6 or program change number. LEDs (10) The LEDs indicate the currently selected menu. If the LEDs have to be arranged in a different way they can be de-soldered an connected via cables. Please refer to the warranty remarks on page 5.
The six buttons are assigned to these functions (from left to right): 1. Midi channel In this menu the desired Midi channel 1...16 is selected in combination with the up/down buttons. To avoid Midi note hang ups the channel can be changed only if no key is pressed on the keyboard (otherwise the note off message would be sent on a different Midi channel causing a never ending tone). The Midi channel is valid for all messages generated by MKE (i.e.
Parameter Storage Whenever one changes from one menu to another the parameter of the preceeding menu is stored non-volatile in the MKE memory. After the next power on these values are chosen. These values are stored: Midi channel, transpose, program change number, function of ST6, dynamic/non-dynamic operation. Non-dynamic Operation MKE was developed to be combined with velocity-sensitive keyboards manufactured by Fatar. For certain applications (e.g.
Check list In case that your MKE does not work at the first go please check the following points: • Is the power supply working correctly ? After power on the display has to show the software version (e.g. "1.10") and all LEDs have to be off ! Otherwise the AC adapter used is not suitable, has the wrong polarity or does not work. The correct polarity is: outside ring = GND, inside lead = +7...12V.
MKE page 16 User's guide V2
Appendix: Connecting the After Touch of Fatar keyboards: MKE ST8 Jumper ST6 NC (GND) +5V after touch connector of the Fatar keyboard The value of the pull-down resistor R12 (10k) can be reduced to obtain a different behaviour of the after touch sensor. Doepfer Musikelektronik www.doepfer.
