Quick Start Guide
921A OSCILLATOR DRIVER
Legendary Analog Oscillator Driver
Module for Eurorack
Controls
(1) FREQUENCY – This knob manually sets the frequency for
oscillators connected to the 921A module.
(2) SEMITONE/OCTAVE – Use this rocker switch to
select between semitone or octave increments for the
FREQUENCY knob.
(3) WIDTH OF RECTANGULAR WAVE – Select between
settings ranging from 10% to 90%.
(4) CONTROL INPUT/FREQUENCY – Connect incoming
control voltage signals for the frequency to these dual
summed input jacks via cables with 3.5 mm TS connectors.
These two control inputs are also summed with the
FREQUENCY control knob.
(5) CONTROL INPUTS/WIDTH – Connect incoming control
voltage/modulation signals for the rectangular wave
width to these dual summed jacks via cables with 3.5 mm
TS connectors. These two control inputs are also summed
with the WIDTH knobs.
(6) CONTROL OUTPUTS TO 921B – Connect control signals to
a 921B VCO modules. The left output jack is for frequency
control signals and connects to one of the 921B frequency
link jacks. The right output jack is for rectangular wave
width control signals and connects to one of the 921B
width link jacks. The secondary parallel link jacks on the
921B can then be chained to other 921B VCO modules,
and up to twelve 921B modules can be driven by the
921A driver.
Power Connection
The 921A OSCILLATOR DRIVER module comes with the required
power cable for connecting to a standard Eurorack power supply
system. Follow these steps to connect power to the module.
It is easier to make these connections before the module has been
mounted into a rack case.
1. Turn the power supply or rack case power o and
disconnect the power cable.
2. Insert the 16-pin connector on the power cable into the
socket on the power supply or rack case. The connector has
a tab that will align with the gap in the socket, so it cannot
be inserted incorrectly. If the power supply does not have
a keyed socket, be sure to orient pin 1 (-12 V) with the red
stripe on the cable.
3. Insert the 10-pin connector into the socket on the back of
the module. The connector has a tab that will align with the
socket for correct orientation.
4. After both ends of the power cable have been securely
attached, you may mount the module in a case and turn on
the power supply.
(1)
(2)
(3)
(5)
(6)
(4)
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