Doepfer MKE Universal Midi Keyboard Electronics Kit - Manual (Page 6)

MKE page 6 User's guide V2
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.
Another reason for the external power supply is the fact that line voltages and plug
types vary considerably from country to country. Using a plug-in external supply the
MKE can be used anywhere with a locally purchased power supply, thus keeping the
retail price down.
The power supply must be able to deliver 7-12 VDC unstabilized voltage, as well as a
minimum current of 250mA. The MKE is switched ON by plugging the AC adapter
into a wall outlet and connecting it to the appropriate jack on the MKE board. There is
no separate ON/OFF switch. If the polarity of the power supply is incorrect, the MKE
will not function. However, there is no danger of damage to the circuitry since it is
protected by a diode. The correct polarity is: outside ring = GND, inside lead =
+7...12V. The power supply not included with the MKE and has to be purchased
separately.
After power on the six LEDs light up for a short moment and the software version
(e.g. 1.0) is displayed.
(2) Midi-Out
Connect the Midi Out jack with Midi In of the device to be controlled by the MKE (e.g. sound
expander, computer, sequencer, synthesizer, or a second MKE or another OEM product like
Pocket Electronics, Dial Electronics, CTM64) via a suitable Midi cable.
(3) Midi-In
The MKE features a Midi input. This input may be connected to another Midi device.
The incoming Midi data are merged to the data generated by the MKE. At the first
place the Midi input is used for daisy-chaining several MKE or other OEM products
like Pocket Electronics, Dial Electronics or CTM64. The Midi input of MKE is not
suitable for large amounts of Midi (e.g. SysEx strings or Midi messages coming from
an computer sequencer). In case of large amounts of incoming Midi messages data
loss or delay may occur. If the merge feature of the MKE is not required the Midi
input is left open.