Duatt 1U Manual
Front Panel
Controllers
1. Channel attenuator (x2)
These knobs linearly attenuate the
voltage present at the input
[A or B]
of each channel. If no
voltage is present at the input, the
knobs attenuate a +5V DC
voltage.
The Channel Polarity Switch
[2]
determines the range and
behaviour of the knob.
2. Channel Polarity Switch (x2)
This switch sets the polarity of the signal sent to the output
[C or D]
of each channel.
UNI : With the switch in the left UNI position, the corresponding Channel Attenuator
Knob
[1]
functions as a standard attenuator. The full value of the channel’s input voltage
(or +5V DC, if the input is unpatched) passes through to the output when the knob is fully
clockwise. None of the voltage (0 V) passes to the output with the knob fully
counterclockwise; and half the voltage passes through when the knob is at the ‘noon’
position.
-/+ : With the switch in the right -/+ position, the corresponding Channel Attenuator
Knob
[1]
acts as a bipolar attenuverter. The full value of the channel’s input voltage (or
+5V DC, if the input is unpatched) passes through to the output when the knob is fully
clockwise. The inverse of the input voltage is sent to the output when the knob is fully
counterclockwise; and none of the input voltage (0 V) passes through to the output when
the knob is at the ‘noon’ position.
3. Ax2 switch
In the up (on) position, this switch doubles the voltage appearing at Channel A’s
input
[A]
.
For example: leave the input of Channel A unconnected; set its channel’s polarity switch
to -/+ , turn its channel attenuator fully clockwise; and set the Ax2 switch to the down (off)
position. Duatt will internally send 5V to Channel A’s input. Flip the Ax2 switch to the up
(on) position, and Duatt sends 10V (5V x 2) to Channel A’s input. Rotate the knob fully
counterclockwise, and Duatt sends -10V (-5V x 2) to Channel A’s input.
Page 6
