Behringer 921A Oscillator Driver – Control Module for Eurorack Synthesizers

The Behringer 921A Oscillator Driver is a faithful recreation of the legendary module from the “Modular 55” and “35” series that shaped the sound of 1970s electronic music. This compact Eurorack module is designed to control up to 12 921B oscillator modules, providing precise management of frequency and pulse width. With authentic circuit designs and high-quality components, the module delivers not only the genuine analog sound but also stability and reliability for both studio and live performance environments.

Product Features

• Control up to 12 OSCILLATOR 921B modules
• Authentic reproduction of the legendary Moog Modular circuits
• 2 summed CV inputs for frequency control
• 2 summed CV inputs for pulse width modulation (PWM)
• Switchable semitone/octave selector
• Manual pulse width adjustment from 10% to 90%
• High current outputs for stable control of multiple modules
• Eurorack standard: width 8 HP, power consumption +12 V 15 mA, -12 V 15 mA

Full Sound Control and Seamless Integration

With the 921A Oscillator Driver, you can synchronize the operation of multiple oscillators in your modular system to achieve dense, powerful, and harmonically rich tones. The module is designed for quick and intuitive integration with other Eurorack components, while independent CV inputs allow simultaneous modulation of multiple parameters—opening up endless sound design possibilities, from subtle modulations to extreme sonic effects.

Applications

The 921A module is a must-have tool for music producers, composers, and live performers seeking maximum control over their sound. It excels in electronic music, ambient, synthwave, techno, and experimental genres. Thanks to precise controls, it is also a popular choice for professional recording studios working with high-end analog sound.

Detailed Technical Data

• Format: Eurorack
• Width: 8 HP
• Power consumption: +12 V 15 mA, -12 V 15 mA
• Inputs: 2× CV Frequency, 2× CV PWM
• Outputs: High Current Frequency, High Current PWM
• Pulse width adjustment: 10–90%
• Switch: Semitone / Octave
• Design: United Kingdom

Materials and Build

The module is built with high-quality electronic components and features a robust anodized aluminum front panel. The potentiometers and switches have a precise, tactile feel, ensuring long life and comfortable operation. The design is made to withstand heavy use in both studio and live settings.

Included in the Box

• Behringer 921A Oscillator Driver module
• Eurorack power cable
• Mounting screws
• User manual

Summary

The Behringer 921A Oscillator Driver is an essential addition for any enthusiast of analog modular synthesizers. Combining legendary sound architecture with modern reliability, it offers complete control over multiple oscillators in your system—taking your sound to the next level and enabling even the most creative ideas to come to life.