Moog Music MF-103 12-Stage Phaser - Manual (Page 12)

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-103 works satisfactorily on +10 to +15 volts DC and uses
about 100 milliamperes of current. Note that most power adaptors that are
rated at +9V DC will actually produce +10 to +11 volts, and power adaptors
rated at +12V DC will actually produce +13 to +14 volts, when used with the
MF-103. For this reason, you can power your MF-103 from virtually any power
adaptor which has a nominal rating between +9 volts and +12 volts at a rated
current of at least 200 milliamperes, and has the appropriate power connector.
If you use a power source other than that which was supplied with the MF-103,
be sure that the voltage never exceeds +15 volts. Power sources with voltages
in excess of +15 volts may cause serious damage to the MF-103's circuit.
Figure 11 – Correct wiring of power supply connector
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
+5.7 volts which is current-limited to about 0.5 milliamperes. The tip terminals
receive the variable voltages from the pedals.
An expression pedal for use with the MF-103 should contain a 50KW or 100KW
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. See Figure 11.
When connecting one or more pedal control input jacks to a source of
external control voltage such as an analog synth or a MIDI-to-CV converter, you
should use patch cords with tip-ring-sleeve phone plugs. The ring terminal on the
plug should not be connected to anything, so that the MF-103's source of +5.7
volts is not shorted out. Or, if you do not plan to use any expression pedals with
your MF-103 but would like to apply control voltages to one or more pedal
control inputs, you can use patch cords with regular two-conductor phone
plugs. These will short out the +5.7 volt supply to the ring contacts. This voltage is
current-limited, so you won't burn anything out, - but no pedal will work in any of
the pedal control jacks if a tip-sleeve plug is plugged into even one of the
pedal jacks.
Applying a varying voltage to the tip terminal of a pedal control input jack has
the same effect as turning the corresponding knob. A voltage change of about