Behringer 921B Legendary Analog Oscillator VCO Module for Eurorack

SKU: BE921BOSC MFR: 000-E2100-00010
$55.90
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Key Features

  • Craft rich, evolving sounds with the Behringer 921B analog oscillator module.
  • Explore vast sonic landscapes; this Eurorack module offers unparalleled versatility.
  • Easily integrate this VCO module into your setup; it's perfect for sound design.
  • Achieve legendary synth tones; the 921B delivers classic, warm sound quality.
  • Connect seamlessly with other modules, expanding your Eurorack synthesizer setup.
  • Create complex textures; modulate your sounds with multiple waveform outputs.
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On Backorder?Expected Availability: 10/2025
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Behringer 921 Oscillator Specifications

Signal Connections

Signal Connections

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  • Frequency control link inputs

    2x 3.5mm jacks, 1 V/oct.
    Input Impedance: 100 k Ohm, unbalanced
    Maximum input level: -6 V to +6 V
    Frequency range: < 1 Hz to > 40 kHz

  • Rectangular width link inputs

    2x 3.5mm parallel jacks, 1 V/16%
    Input Impedance: 100 k Ohm, unbalanced
    Maximum input level: 0 V to +6 V
    Width range: < 10% to > 90%

  • Sync input

    1x 3.5mm jack, AC coupled
    Sync input impedance: 1.5 k Ohm, unbalanced
    Sync input lock range: +/- 6 semitones
    Sync input response: 10 Hz to 20 kHz, > -10 dBu
    Maximum input level: +15 dBu

  • AC / DC mod input

    2x 3.5mm jacks, AC/DC coupled
    AC / DC mod input impedance: 100 k Ohm, unbalanced
    AC / DC mod response: 10 Hz to 10 kHz, > -10 dBu
    Maximum input level: +4 dBu

  • Waveform outputs

    4x 3.5mm jacks, mono
    Waveforms: Sine, triangular, sawtooth, rectangular
    Output Impedance: < 800 Ohm, unbalanced
    Output level Typically: -4 dBu

Controls

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  • Frequency

    1x Rotary knob
    +/-12 semitone, selectable

  • Range

    1x Rotary switch
    LO / 32' / 16' / 8' / 4' / 2', selectable

  • Sync selector

    1x 3-Position toggle switch
    Weak / off / strong, selectable

  • Power supply

    Eurorack

  • Current draw

    45 mA (+12 V), 45 mA (-12 V)

Physical

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  • Rack units

    8 HP

  • Dimensions

    2.3 x 1.6 x 5.1" (58 x 40 x 129mm)

  • Weight

    4.96 oz (140.61g)

  • UPC Code

    4033653031998

About Behringer 921 Oscillator

Let the Behringer 921B Oscillator transport you back to the golden age of electronic music, replicating the distinctive sound of the legendary System 55, 35, and 15 synth modules from the early 70s. This Eurorack VCO module is an authentic reproduction of the circuitry that powered the iconic sounds of renowned artists like Keith Emerson, Stevie Wonder, and Tangerine Dream.

The 921B Oscillator is a testament to the evolution of modular synthesis, offering the unique opportunity to build your personalized synthesizer that fits seamlessly into a standard Eurorack case. This module allows you to mix and match with other specific modules, enabling you to tailor your synth to the genre of music you play. For the true synth enthusiasts, the 921B Oscillator opens up the possibility of a room filled with modules, creating a sonic playground that fulfills your wildest dreams.

The Behringer 921B Oscillator offers unparalleled tonal control, with the module being driven by the Behringer 921A Oscillator Driver or functioning as a free-running LFO. The separate Frequency and Range knobs provide the flexibility to adjust the frequency range in semitones and octaves. The combination of the 921B and 921A modules forms the cornerstone of a comprehensive modular synthesizer, laying the groundwork for the creation of exceptional music.

The 921B Oscillator features independent audio outputs for each of the four waveforms - sine, triangular, sawtooth, and rectangular. These can be patched out to different modules, unlocking a plethora of creative possibilities. The module also includes a dedicated oscillator sync input and switch, allowing the 921B to sync to a signal introduced into the Sync In jack. The parallel link jacks further enhance the module's versatility, enabling the 921B to link to other 921Bs in the chain.

Installation of the 921B Oscillator is a breeze, thanks to its design that fits perfectly into a standard Eurorack case. Simply connect the power cables to the power supply and secure the module using the included screws. This compatibility allows the 921B Oscillator to blend with other synth modules, resulting in a truly unique setup. Whether you're a modular synth novice or a seasoned collector, the Behringer 921B Oscillator is an indispensable tool for crafting extraordinary music.

Behringer 921 Oscillator Features

  • Vintage-sounding 921B VCO module from the '70s
  • Controlled via the 921A OSCILLATOR DRIVE module, or may be used as a free-running LFO
  • Authentic reproduction of the circuitry from the "Modular 55 & 35" Series
  • Artist roster includes world's most famous pop, rock and jazz musicians
  • Separate audio outs for each of the 4 waveforms: sine, triangular, sawtooth and rectangular
  • Dedicated oscillator sync input, and a switch for selecting either strong or weak sync
  • Parallel link jacks for frequency and width connections to 921A and multiple 921B Oscillators
  • Frequency and width jacks can also be used as external I/O providing even more creative possibilities
  • Eurorack specs: 8 HP, 30 mA +12 V, 45 mA -12 V

Warranty Information

This product has a limited warranty of 12 months.

800-815-0702

Product Documents

User Manual

Key Features

  • Craft rich, evolving sounds with the Behringer 921B analog oscillator module.
  • Explore vast sonic landscapes; this Eurorack module offers unparalleled versatility.
  • Easily integrate this VCO module into your setup; it's perfect for sound design.
  • Achieve legendary synth tones; the 921B delivers classic, warm sound quality.
  • Connect seamlessly with other modules, expanding your Eurorack synthesizer setup.
  • Create complex textures; modulate your sounds with multiple waveform outputs.

What's in the box:

  • Behringer 921B Legendary Analog Oscillator VCO Module
  • Power Cable
  • Screws
  • User Manual
  • Adorama 1 Year Limited Warranty