Behringer 921A Quick Start Guide
Quick Start Guide
921A OSCILLATOR DRIVER
Legendary Analog Oscillator Driver
Module for Eurorack
Controls
(1)
(2)
(3)
(4)
(1) FREQUENCY – This kn ob manually sets th e frequency fo r
oscillat ors connecte d to the 921A module.
(2 ) SEMITONE /OCTAVE – Use this rocker s witch to
selec t between semit one or octave inc rements for the
FREQUENCY knob.
(3 ) WIDTH OF REC TANGULAR WAVE – Select bet ween
settings ranging from 10% to 90%.
(4 ) CONTROL INPUT/FREQUENCY – Connect incoming
control vo ltage signals for t he frequency to t hese dual
summed inp ut jacks via cab les with 3.5 mm TS connec tors.
These t wo control input s are also summed wit h the
FREQUENC Y control knob.
(5 ) CONTROL INPUTS/WIDTH – Co nnect incoming c ontrol
voltage/modulation signals for the rectangular wave
width to th ese dual summed jac ks via cables wit h 3.5 mm
TS connec tors. These t wo control input s are also summed
with the WI DTH knobs.
(5)
(6)
(6 ) CONTROL OU TPUTS TO 921B – Connect control s ignals to
a 921B VCO modules. The le ft output jack i s for frequenc y
control si gnals and connec ts to one of the 921B frequenc y
link jack s. The right outpu t jack is for rect angular wave
width con trol signals and conn ects to one of the 921B
width lin k jacks. The secon dary parallel li nk jacks on the
921B can then be chain ed to other 921B VCO modules,
and up to twe lve 921B modules c an be driven by the
921A dr iver.
Power Connection
The 921A OSCILLATOR DRIVER m odule comes with t he required
power cab le for connectin g to a standard Euror ack power supply
system . Follow these step s to connect power to t he module.
It is easier to m ake these connec tions before the m odule has been
mounted in to a rack case.
1. Turn the power su pply or rack case p ower o and
disconne ct the power cabl e.
2. Insert the 16- pin connector o n the power cable into t he
socket on t he power supply or rac k case. The connec tor has
a tab that wi ll align with the gap in t he socket, so it can not
be inser ted incorrec tly. If the power supply d oes not have
a keyed socke t, be sure to orient pi n 1 (-12 V) with the red
stripe o n the cable.
3. Insert the 10 -pin connecto r into the socket on th e back of
the module. T he connector has a t ab that will align wi th the
socket for correct orientation.
4. After both en ds of the power cable hav e been securely
attac hed, you may mount the mo dule in a case and tur n on
the power supply.
Installation
The neces sary screws ar e included with th e module for mount ing
in a Eurorac k case. Connect t he power cable bef ore mounting.
Dependi ng on the rack case, th ere may be a series of x ed holes
spaced 2 HP ap art along the leng th of the case, or a tra ck that
allows indi vidual threaded p lates to slide along th e length
of the cas e. The free-movi ng threaded plate s allow precise
positio ning of the module, bu t each plate should be po sitioned in
the approx imate relation to th e mounting holes in yo ur module
before attaching the screws.
Hold the mo dule against the Eur orack rails so that e ach of the
mounting h oles are aligned wi th a threaded rail o r threaded
plate. Att ach the screws par t way to start, w hich will allow
small adjus tments to the pos itioning while you g et them all
aligned. After the nal position has been established, tighten the
screws d own.
Specications
Controls
Frequency 1 x rotary knob
Semitone / octave Rocker switch,
Width of rectangular wave < 10% to > 90%,
Signal Connections
Frequency control inputs 2 x 3.5 mm jack, summed,
Rectangular width
control inputs
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
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),
Physical
Dimensions 40 x 129 x 35 mm
Rack units 8 HP
Weight 0.09 kg (0.20 lbs)
±6 octaves / ±12 semitone,
switchable
±1 VDC or ±6 VDC
0 VDC to +6 VDC
1 V/oct.
2 x summed 3.5 mm jack,
1 V/16%
1 x 3.5 mm jack, 1 V/16%
25 mA (-12 V)
(1.6 x 5.1 x 1.4")
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or statement contained herein. Technical specications, appearances and other information are subject to change without notice. All trademarks are the property
of their respective owners. Midas, Klark Teknik, Lab Gruppen, Lake, Tannoy, Turbosound, TC Electronic, TC Helicon, Behringer, Bugera, Auratone and Coolaudio are
trademarks or registered trademarks of Music Tribe Global Brands Ltd. © Music Tribe Global Brands Ltd. 2019 All rights reserved.
LIMITED WARRANTY
For the applicable warranty terms and conditions and additional information regarding Music Tribe’s Limited Warranty, please see complete details online at
musictribe.com/warranty.
Zhongshan Eurotec Electronics Limited
No. 10 Wanmei Road, South China Modern Chinese Medicine Park, Nanlang Town, 528451, Zhongshan City, Guangdong Province, China
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