Technical information

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TECHNICAL INFORMATION
NOTE: The following information is intended for use by people who
understand analog electronic circuitry and have enough practical
experience to interconnect sophisticated electronic equipment correctly.
POWER: The MF-107 works on +9 volts DC and uses a max of about
200 milliamperes of current. Use only the power supply supplied with
the MF-107 or the exact equivalent. Power sources rated with voltages
in excess of +9 volts may cause damage to the MF-107’s circuits, and
will void the warranty.
PEDAL INPUTS: All pedal control input jacks are 1/4” tip-ring-sleeve
(stereo) phone jacks. The sleeves are grounded and the ring terminals are
supplied with +5 volts which is current-limited. The tip terminals receive
the variable voltages from the pedals.
An expression pedal for use with the MF-107 should contain a
50KOhm or 100KOhm linear taper potentiometer which is connected
from the sleeve to the ring terminals. The potentiometer wiper is
connected to the tip terminal. The pedal cable should be shielded, with
the shield connected to the sleeve terminal.
With the MF-107, You can use any combination of expression pedals
and cables that carry CVs. Regular tip-sleeve cables work ne with each
input, as there is a separate current limiting circuit for each control input
- so you won’t burn anything out. Applying a varying voltage to the
tip terminal of a pedal control input jack has the same effect as turning
the corresponding knob. Note the voltages here are summed with the
voltages from the front panel controls. You set the minimum voltage
with the front panel controls. The Freq. In is the only control that accepts
a negative input, as it can aceept a -5V to +5V Input. All other control
inputs are designed to accept zero to +5V inputs. Do not exceed these
ratings.