GMS-302 Dual VCO

Precise stable multiple waveform oscillator

Two full function analog voltage controlled oscillators combined in one 2MU wide panel along with essential support functions provide stable wide range waveforms including sine, triangle, pulse, saw and square waves. In addition, an analog selector followed by a linear control VCA allows selection of one of the oscillator waveforms and scaling of the output amplitude under voltage control.

Each oscillator has a 1 volt per octave control input and an additional frequency control voltage input with attenuator give flexible control over the frequency output in addition to a calibrated range switch for accurate octave scaling.

Both linear and exponential FM modulation inputs are available. The linear input has selectable AC or DC coupling. Both inputs can be scaled with a level control.

The pulse waveform output has a control for pulse width and a voltage control input with attenuverter for pulse width modulation.

The oscillator can be synched to an external waveform. A soft, hard or OFF coupling switch is provided to control the sync behavior.


Technical Specifications

Each Oscillator

Frequency Range
0.1 Hz to 20 KHz

1 Volt/Octave Range
Operation over 10 octaves

Waveform Output Level
+- 5V PP

Freq. Range Switch
Calibrated range switch, LFO, 32', 16', 8', 4', 2'

Waveform Outputs
Sine, triangle, pulse, saw, square (through waveform switch)

Modulation Inputs
1V/octave, linear FM (AC/DC coupling), exponential FM, pulse width modulation

WAVE output VCA gain
1.0 Volt/Volt

Module Power
+15 Volts 130 mA.
-15 Volts 110 mA.
+5 Volts 25 mA.

Module Size
Panel height - 8.75 inches (222 mm)
Panel width - 4.25 inches (108 mm)
Depth (behind panel) 2.125 inches (54 mm)



We produce electronic synthesizer modules in the two most popular formats, MU (Moog compatible 5U) and EU (Eurorack compatible 3U). A wide range of voltage controlled modules including oscillators, amplifiers, mixers, envelope generators, special effects units, wave generators, filters, power systems and cases allow users complete freedom to configure any desired electronic music instrument.


Grove Audio builds microphones, preamplifiers, equalizers, compressors and other professional audio equipment for performance and studio use. We build units in popular formats such as 19 inch rack mount and 500 series 3U modules. We can also produce custom designs on request. Contact us for a consultation.


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Grove Audio has been manufacturing professional recording and modularized electronics for musicians and performers since 1995.