Behringer 921A Oscillator Driver User manual

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)

Installation
The necessary screws are included with the module for mounting
in a Eurorack case. Connect the power cable before mounting.
Depending on the rack case, there may be a series of xed holes
spaced 2 HP apart along the length of the case, or a track that
allows individual threaded plates to slide along the length
of the case. The free-moving threaded plates allow precise
positioning of the module, but each plate should be positioned in
the approximate relation to the mounting holes in your module
before attaching the screws.
Hold the module against the Eurorack rails so that each of the
mounting holes are aligned with a threaded rail or threaded
plate. Attach the screws part way to start, which will allow
small adjustments to the positioning while you get them all
aligned. After the nal position has been established, tighten the
screws down.
Specications
Controls
Frequency 1 x rotary knob
±6 octaves / ±12 semitone,
switchable
Semitone / octave Rocker switch,
±1 VDC or ±6 VDC
Width of rectangular wave < 10% to > 90%,
0 VDC to +6 VDC
Signal Connections
Frequency control inputs 2 x 3.5 mm jack, summed,
1 V/oct.
Rectangular width
control inputs
2 x summed 3.5 mm jack,
1 V/16%
Input Impedance 100 kΩ unbalanced
Maximum input level -10 VDC to +10 VDC
Frequency control output 1 x 3.5 mm jack, 1 V/oct.
Rectangular width
control output
1 x 3.5 mm jack, 1 V/16%
Output Impedance 10 Ω unbalanced
Maximum output level -10 VDC to +10 VDC
Drive capability 12 x 921B VCO modules
Power
Power supply Eurorack
Current draw 25 mA (+12 V),
25 mA (-12 V)
Physical
Dimensions 40 x 129 x 35 mm
(1.6 x 5.1 x 1.4")
Rack units 8 HP
Weight 0.09 kg (0.20 lbs)
LEGAL DISCLAIMER
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trademarks or registered trademarks of Music Tribe Global Brands Ltd. © Music Tribe Global Brands Ltd. 2019 All rights reserved.
LIMITED WARRANTY
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Zhongshan Eurotec Electronics Limited
No. 10 Wanmei Road, South China Modern Chinese Medicine Park, Nanlang Town, 528451, Zhongshan City, Guangdong Province, China