Behringer 921A Oscillator Driver Synthesizer Module

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  • Behringer 921A Oscillator Driver Synthesizer Module
  • Behringer 921A Oscillator Driver Synthesizer Module
  • Behringer 921A Oscillator Driver Synthesizer Module
Our Price: $205.00

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Legendary Analogue Oscillator Driver Module for Eurorack 

The first System 55, 35 and 15 synth modules came out from Moog in the early 70's and tended to be extremely expensive.

They were mainly all discrete transistor designs as op-amps at the time were very high cost. The discrete circuitry gave the modules a very distinctive sound and were used by artists like Keith Emerson, Stevie Wonder, Tangerine Dream and so many more, giving us some of the greatest records we’ve ever heard. 

Modular synths were a landmark development in electronic music and today, it’s about to get better.

Enter the Behringer 921A OSCILLATOR DRIVER - an authentic reproduction of the circuitry from the Moog “Modular 55 and 35” series oscillator drivers used by the world’s most famous pop, rock and jazz musicians.

Now you can build your very own, unique synthesizer that fits in a standard Eurorack case for a very affordable price.

Mix and match with specific modules to customise your synth and complement the genre of music you play or go all out and have a room filled from floor to ceiling with modules that’ll fulfil any synth geek’s wildest dreams.


  • Controls up to 12 parallel 921B OSCILLATOR modules
  • Authentic reproduction of the circuitry from the Moog “Modular 55 & 35” Series
  • Artist roster includes world’s most famous pop, rock and jazz musicians
  • 2 summed CV inputs for frequency control and 2 summed CV inputs for PWM
  • High current outputs for frequency and pulse width to drive multiple 921B modules
  • Switchable semitone/octave selector and manual pulse width control
  • Eurorack specs: 8 HP, 15 mA +12 V, 15 mA -12 V
  • 3-Year Warranty Program
  • Designed and engineered in the U.K.


The 921A OSCILLATOR DRIVER module features a frequency knob that can adjust between either octave or semitone frequencies. The included rocker switch can be used to select between the two frequency types.

The width of the rectangular wave is adjusted via a control knob that goes from 10% up to 90%. You can also connect any incoming control voltage or modulation signal into either of the 3.5 mm Frequency or Width inputs.

Ins and Outs

Layering different sounds and beats is the hallmark of any amazing synth jam.

That’s why we’ve decided that the 921A not only control just one 921B Oscillator, but 12 of them!

This provides you with more flexibility and more nuanced waveforms.

Eurorack Ready

Installing the 921A is simple as it was designed to fit into a standard Eurorack case. Just connect the power cables to the power supply and screw in the module using the included screws.

This allows for the 921A to be mixed with other synth modules for a truly unique set up.

Complete Your Collection

Whether you’re just getting into modular synths or looking to complete your collection, the 921A OSCILLATOR DRIVER module from Behringer is a great tool to have when creating amazing music.

For more information, Click Here to visit the Manufacturer's Website

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Warranty Information

3 Years
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