Behringer Legendary 2500 Series

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Quick Start Guide

OSCILLATOR MODULE 1004

Legendary 2500 Series Dual Core VCO

Module for Eurorack

Controls

(1) COARSE FREQUENCY – Sets the frequency from 0.03 to

32 Hz in the low (LFO) range, or from 15.5 Hz to 16 kHz in

the high (audio) range, depending on the Fine frequency

knob setting.

(2) FINE FREQUENCY – Adjusts the frequency by a factor of

±1 octave, potentially halving or doubling the frequency

at either extreme.

(3) ENABLE switch – Turns the oscillator on and o.

(4) RANGE switch – Determines whether the oscillator

operates in the low (subsonic/LFO) band or the high

(audio) band.

(5) WAVEFORM switches – Engage up to 5 waveforms by

moving the relevant toggle switch to the left, or engage

the inverse waveform by moving the switch to the right.

The center position turns the waveform o. Engaging

multiple switches simultaneously produces the average of

all active waveforms.

(6) PW knob – Manually control the pulse width for the

pulse waveform.

(7) FM 2 knob – Attenuates the signal connected to the FM

2 input.

(8) PWM knob – Adjusts the modulation depth of the PMW

control input.

(9) FM 1 knob – Attenuates the signal connected to the FM

1 input.

(10) KYBD – Connect a keyboard or other external frequency

control via 3.5 mm TS cable.

(11) FM 1/2 – Connect external voltages to modulate

the frequency.

(12) PWM – Connect an external voltage to modulate the

pulse width.

(13) OUT – Send the oscillator signal to other modules via

3.5 mm TS cable.

Power Connection

The unit 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)

(6)

(7)

(8)

(5)

(4)

(9)

(10) (11) (12) (13)

V 1.0

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Summary

Oscillator Module 1004 Controls

Coarse Frequency Control

Sets frequency from 0.03 Hz to 32 Hz (LFO) or 15.5 Hz to 16 kHz (audio).

Fine Frequency Adjustment

Adjusts frequency by ±1 octave, halving or doubling frequency.

Range Switch

Selects oscillator operation between low (subsonic/LFO) and high (audio) bands.

Waveform Selection Switches

Engage up to 5 waveforms; center position turns waveform off.

Pulse Width (PW) Knob

Manually controls pulse width for the pulse waveform.

FM 2 Input Control

Attenuates the signal connected to the FM 2 input.

PWM Modulation Control

Adjusts the modulation depth of the PWM control input.

FM 1 Input Control

Attenuates the signal connected to the FM 1 input.

Keyboard;Frequency Control Input

Connects keyboard or external frequency control via 3.5 mm TS cable.

FM 1;2 Voltage Control Inputs

Connect external voltages to modulate the frequency.

PWM Voltage Control Input

Connects external voltage to modulate pulse width.

Audio Output

Sends the oscillator signal to other modules via 3.5 mm TS cable.

Summary

Oscillator Module 1004 Controls

Coarse Frequency Control

Sets frequency from 0.03 Hz to 32 Hz (LFO) or 15.5 Hz to 16 kHz (audio).

Fine Frequency Adjustment

Adjusts frequency by ±1 octave, halving or doubling frequency.

Range Switch

Selects oscillator operation between low (subsonic/LFO) and high (audio) bands.

Waveform Selection Switches

Engage up to 5 waveforms; center position turns waveform off.

Pulse Width (PW) Knob

Manually controls pulse width for the pulse waveform.

FM 2 Input Control

Attenuates the signal connected to the FM 2 input.

PWM Modulation Control

Adjusts the modulation depth of the PWM control input.

FM 1 Input Control

Attenuates the signal connected to the FM 1 input.

Keyboard;Frequency Control Input

Connects keyboard or external frequency control via 3.5 mm TS cable.

FM 1;2 Voltage Control Inputs

Connect external voltages to modulate the frequency.

PWM Voltage Control Input

Connects external voltage to modulate pulse width.

Audio Output

Sends the oscillator signal to other modules via 3.5 mm TS cable.

The Behringer Oscillator Module 1004 is a legendary 2500 Series Dual Core VCO module designed for Eurorack systems, offering a wide range of frequency generation and modulation capabilities. This module is a versatile tool for sound designers and musicians looking to integrate classic analog synthesis into their modular setups.

Function Description

The core function of the Oscillator Module 1004 is to generate various waveforms across a broad frequency spectrum, from low-frequency oscillation (LFO) to high-frequency audio. It features two independent frequency modulation (FM) inputs (FM 1 and FM 2) and a pulse width modulation (PWM) input, allowing for extensive sound shaping. The module can output up to five distinct waveforms simultaneously, or their averaged combination, providing a rich palette of timbres.

Important Technical Specifications

Frequency Range:
- LFO (Low Range): 0.03 Hz to 32 Hz (Coarse Frequency)
- Audio (High Range): 15.5 Hz to 16 kHz (Coarse Frequency)
- Fine Frequency Adjustment: ±1 octave
Inputs:
- FM 1/2: Two 3.5 mm TS jacks, 50 kΩ unbalanced impedance, 10 V, 1 V/octave max input level. These inputs allow external voltages to modulate the oscillator's frequency, with an attenuator knob (FM 1/2) to control the modulation depth from -∞ to unity gain.
- Keyboard (KYBD): One 3.5 mm TS jack, 50 kΩ unbalanced impedance, 10 V, 1 V/octave max input level. This input is designed for connecting a keyboard or other external frequency control source.
- PWM: One 3.5 mm TS jack, 50 kΩ unbalanced impedance, ±10 V, 10% per volt CV range. This input allows external voltage control over the pulse width of the pulse waveform, with a dedicated knob (PWM) for manual adjustment of modulation depth.
Outputs:
- OUT: Two 3.5 mm TS jacks, 1 kΩ unbalanced impedance, 10 V p-p max output level. This is the main audio output for the generated oscillator signal.
Power:
- Power Supply: Eurorack standard.
- Current Draw: 60 mA (+12 V), 50 mA (-12 V).
Physical:
- Dimensions: 46 x 81 x 129 mm (1.8 x 3.2 x 5.1").
- Rack Units: 16 HP.
- Weight: 0.17 kg (0.37 lbs).

Usage Features

The module's front panel is intuitively laid out with several controls and inputs for comprehensive sound manipulation:

COARSE FREQUENCY knob (1): This large knob sets the fundamental frequency of the oscillator. In the "LOW RANGE" (LFO) mode, it spans from 0.03 Hz to 32 Hz. In the "HIGH RANGE" (audio) mode, it covers 15.5 Hz to 16 kHz.
FINE FREQUENCY knob (2): This knob provides precise frequency adjustment, allowing for a factor of ±1 octave, effectively halving or doubling the frequency at its extremes.
ENABLE switch (3): A simple toggle switch to turn the oscillator on or off.
RANGE switch (4): This switch determines whether the oscillator operates in the low (subsonic/LFO) band or the high (audio) band.
WAVEFORM switches (5): These five toggle switches allow engagement of different waveforms (sine, triangle, square, saw, pulse). Moving a switch to the left engages the standard waveform, while moving it to the right engages the inverse waveform. The center position turns the waveform off. Engaging multiple switches simultaneously produces an averaged output of all active waveforms.
PW knob (6): Manually controls the pulse width for the pulse waveform.
FM 2 knob (7): Attenuates the signal connected to the FM 2 input, controlling its modulation depth.
PWM knob (8): Adjusts the modulation depth of the PWM control input.
FM 1 knob (9): Attenuates the signal connected to the FM 1 input, controlling its modulation depth.
KYBD input (10): A 3.5 mm TS jack for connecting a keyboard or other external frequency control sources.
FM 1/2 inputs (11): Two 3.5 mm TS jacks for connecting external voltages to modulate the frequency.
PWM input (12): A 3.5 mm TS jack for connecting an external voltage to modulate the pulse width.
OUT outputs (13): Two 3.5 mm TS jacks to send the oscillator signal to other modules.

Power Connection: The module comes with a standard Eurorack power cable. To connect power:

Turn off the power supply or rack case.
Insert the 16-pin connector of the power cable into the socket on the power supply or rack case, ensuring correct orientation (tab alignment or red stripe for pin 1/-12V).
Insert the 10-pin connector into the socket on the back of the module, ensuring correct orientation.
Once securely attached, the module can be mounted, and the power supply turned on.

Installation: The module includes necessary screws for mounting in a Eurorack case. It's recommended to connect the power cable before mounting. The installation process involves aligning the module's mounting holes with the threaded rails or plates of the Eurorack case, attaching screws part way to allow for minor adjustments, and then tightening them once the final position is established.

Maintenance Features

The manual does not explicitly detail specific maintenance features beyond proper installation and power connection. However, as a modular synth component, general best practices for electronic equipment apply:

Keep the module clean and free from dust.
Avoid exposing it to extreme temperatures or moisture.
Ensure proper power supply to prevent damage.
Handle with care during installation and removal to avoid damaging connectors or components.

The Behringer Oscillator Module 1004 is a robust and versatile Eurorack module, designed to be a reliable workhorse in any modular synthesis setup, offering classic analog VCO capabilities with extensive modulation options.