Behringer 921 Voltage Controlled Oscillator Manual

Behringer Syntese maskine 921 Voltage Controlled Oscillator

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Side 1/3

Quick Start Guide

921 VOLTAGE

CONTROLLED OSCILLATOR

Legendary Analog VCO Module

for Eurorack

Controls

(4)

(5)

(6)

(3)

(8)

(7)

(2)

(9)

(10)

(11)

(1)

(13)

(12)

(1) FREQUENCY – Use this knob to set the oscillator frequency.

The frequency settings for this knob are controlled by the

COARSE RNG and SCALE toggle switches, as well as the

RANGE rotary switch.

(2) RANGE – This knob sets the general frequency range of the

oscillator in one-octave steps, which can then be adjusted

up or down with the FREQUENCY knob.

(3) SCALE – This switch controls whether the frequency knob

scale is ±6 octaves or ±12 semitones, which gives ner

frequency control.

(4) COARSE RNG – This switch controls whether the oscillator

frequency functions in the audio range or in a lower

frequency range that extends below the audio threshold.

(5) RECTANGULAR WIDTH – Use this knob to set a default

width for the rectangular waveform. The width can then be

further controlled and varied by control voltages routed in

via the CNTRL IN jacks.

(6) CNTRL IN – These summed jacks allow control voltage and

modulation signals for the rectangular waveform to be

routed in via cables with 3.5 mm TS connectors.

(7) CLAMPING POINT – Use this knob to set the point at which

the oscillator waveform resets.

(8) TRIG (V/S) – These jacks allow control signals for the

clamping point to be routed in via cables with

3.5 mm TS connectors. The clamping point can be triggered

with a V-Trig (voltage trigger) signal via the

V jack, or a S-Trig (switch trigger) signal via the S jack.

(9) AUX OUT WAVEFORM – Use this knob to select a waveform

for the auxiliary output signal, including sine, triangular,

sawtooth, inverted sawtooth, square and inverted

square waveforms.

(10) AUX OUT LEVEL – Use this knob to adjust the output level

for the AUXILIARY OUTPUT jacks.

(11) AUXILIARY OUTPUTS – Use these jacks to route an auxiliary

waveform signal out of the module via cables with 3.5 mm

TS connectors.

(12) FREQUENCY CONTROL INPUTS – Use these summed jacks

to route control voltage and modulation signals into the

oscillator via cables with 3.5 mm connectors.

(13) WAVEFORM OUTPUTS – Use these jacks to route oscillator

signals out of the module via cables with

3.5 mm jacks. Four waveforms are available: sine, triangular,

sawtooth and rectangular.

Power Connection

The 921 VOLTAGE CONTROLLED OSCILLATOR 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.

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.

Tuning Procedure

This procedure tunes the 921 VOLTAGE CONTROLLED OSCILLATOR

module’s “octave scaling” to an exact 1 V/oct. calibration to

facilitate precise control.

1. Power up the 921 module and allow it to warm up for a

few minutes.

2. Prepare the following control settings on the 921 module:

a. Set the SCALE toggle switch to the ±12 SEMI position.

b. Set the RANGE toggle switch to the AUDIO position.

c. Set the RANGE rotary switch to 2’.

d. Set the FREQUENCY control knob so that the

sawtooth output is exactly 640 Hz as measured with

an accurate frequency meter.

e. Make sure none of the FREQUENCY CONTROL INPUTS

jacks are connected.

Note: All adjustment trimmers are accessible from the 921

module’s underside. Note the positions of the SCALE and HI ADJ

multi-turn trimmers, and make sure you have suitable tools to

adjust the trimmers if required.

3. Fine-tune the 921 oscillator’s low-frequency scaling via the

following steps:

a. Apply exactly -2 V to a FREQUENCY CONTROL INPUTS

input jack. (A 921A module can be used to supply the

-2 V or use a similar low-impedance stable-voltage

source.)

b. Trim the SCALE trimmer to set 160 Hz, then remove

the -2 V input and readjust the FREQUENCY knob

to 640 Hz.

c. Repeat this cycle until both 160 Hz and 640 Hz are

accurate to ±1 Hz when the -2 V is plugged in and

out of the FREQUENCY CONTROL INPUTS jack.

4. Fine-tune the 921 oscillator’s high-frequency scaling via

the following steps:

a. With no FREQUENCY CONTROL INPUTS jack

connected, check the frequency is still set for 640 Hz

output, then apply exactly +2 V to the FREQUENCY

CONTROL INPUTS input.

b. Trim the HI ADJ trimmer to set the 921 sawtooth

output to exactly 2.560 kHz.

c. Re-check that 640 Hz is still correct when the +2 V

input is removed.

d. Repeat as required.

Specications

Signal Connections

Frequency control inputs 3 x 3.5 mm jacks, summed,

1 V/oct.

Rectangular width

control inputs

2 x 3.5 mm jacks, summed,

1 V/15%

Input Impedance 100 kΩ, unbalanced

Maximum input level -6 to +6 V

Clamping point

trigger inputs

2 x 3.5 mm jacks

(1 x V-trig, 1 x S-trig)

V-trig input impedance 10 kΩ, unbalanced

S-trig input impedance 30 kΩ, unbalanced

Maximum input level +12 V

Auxiliary outputs 1 x 3.5 mm jack, mono,

+/- polarity

Output Impedance 50 Ω, unbalanced

Maximum output level +10 dBu

Waveform outputs 4 x 3.5 mm jacks, mono

Waveforms Sine, triangular, sawtooth,

rectangular

Output Impedance < 800 Ω, unbalanced

Output level Typically -4 dBu

Controls

Scale 1 x toggle switch

±6 octaves / ±12 semitone,

selectable

Coarse range 1 x toggle switch

Sub-audio range, typically

0.01 Hz to 800 Hz

Audio range, typically

1 Hz to 80 kHz

2921 VOLTAGE CONTROLLED OSCILLATOR

Produkt Specifikationer

Mærke:	Behringer
Kategori:	Syntese maskine
Model:	921 Voltage Controlled Oscillator

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