Doepfer MTV16 Midi-to-Voltage Interface with 16 Analog Voltage Outputs - Manual (Page 5)

Installation and User's Guide MTV16 Page 5
Connections
Power Supply (BU3)
The MTV16 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 MTV16 increases the electrical safety. Therefore an external power supply of
high quality and safety should be used. If the unit 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 MTV16 can be used any where 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 100mA. The MTV16 is switched ON by plugging the AC adapter into a wall outlet and
connecting it to the appropriate jack on the MTV16 board. There is no separate ON/OFF switch.
If the polarity of the power supply is incorrect, the MTV16 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 is not included with the MTV16 and has
to be purchased separately (exception: for deliveries within Germany a 230V power supply with
European type mains plug is included).
Midi In (BU1)
The Midi In of the MTV16 is connected to Midi Out of the device that generates the Midi control
change messages that are used to control the MTV16 outputs (e.g. Midi sequencer). The
incoming Midi data are used to control the outputs of the MTV16 provided that the Midi data
correspond to the jumper settings of the MTV16 (channel, control change numbers). If several
MTV16 are controlled from the same device the MTV16 can be daisy-chained via Midi-Thru
Æ
Midi In. The Midi input of MTV16 is not suitable for large amounts of Midi data (e.g. long SysEx
strings or extensive Midi messages coming from an computer sequencer) as the Midi in buffer is
only 48 bytes. In case of large amounts of incoming Midi messages data loss or delay may
occur.
Midi Out (BU2)
MTV16 transmits the incoming Midi data unchanged to the Midi Out socket. This socket can be
connected to the Midi input of another Midi device that has to be controlled with the same Midi
data as the MTV16 (e.g. several daisy-chained MTV16). Otherwise this socket remains
unconnected.
Control LED (D4)
The LED is used to display any Midi In/Thru activity. After power on the LED is permanently on.
As soon as a relevant Midi out event occurs the LED turns off for a short time thus indicating
Midi activity.
Attention: Only Midi messages that are used to control the outputs of the MTV16 are displayed
by the LED. Other Midi messages are ignored (but they are forwarded to the Midi out socket).
Analog Voltage Outputs (JP1 / JP2)
JP1: output voltages 1 ... 8
JP2: output voltages 9 ... 16