The voltage controlled oscillator is one of the essential core modules in your modular analogue synth. The M²Synth has a few options for VCOs:

• VCO 101 with sync inputs and sub octave pulse outputs
• VCO 102 is a quad VCO with preset chord intervals between the VCOs
• VCO 103 is a mini version of the 101 without the sync and sub octave features
• Voice 108 has in addition to a VCO, other core functions including a filter, VCA, noise, ADSR etc.

Overview 

This module, the Voice 108 contains all of the essential elements of an analogue synth in a single 'voice' module. It uses toggle switches for patching with additional jack sockets for integrating into your modular synth.

Voice 108 Functions: VCO, LP VCF, VCA, ADSR, LFO, Noise generator, Mixer & Gate Pulse Generator

Voice 108 Patching:

• ADSR gate - internal from repeat gate generator or external source
• VCO frequency modulation from LFO or ADSR
• VCO PWM modulation from LFO or ADSR
• VCF cut-off modulation from LFO or ADSR
• VCF cross modulation from LFO or ADSR
• VCA level from LFO or ADSR

Features

• 1 Volt / Octave CV
• Coarse and fine VCO frequency controls
• PWM control
• CV control of VCO pulse width modulation (PWM)
• Sub-octave square wave output 1 octave below main frequency
• Jacks for VCO Sine, Triangle, Saw and Pulse waveform outputs 

VCF Features:

• 1 Volt / Octave CV
• CV control of VCF cut-off, cross modulation and resonance
• Controls for cut-off, resonance and cross modulation

VCA Features:

• CV control of VCA level
• Initial level control

LFO Features:

• LFO waveforms square, saw, triangle & ramp
• Level and rate controls 

Gate Pulse Generator:

• Gate rate control

Mixer Features:

• Six mixer level controls for VCO pulse, sub-octave, saw, triangle, sine + noise
• Common voice output jack

• Controls for Attack, Decay and Release envelope phases along with the Sustain level
• Time range selection switch x1 / x10
• Gate input for full ADSR output
• Illuminated manual gate button
• LED indicator of gate pulse
• ADSR output level control

 Specification

• Supply voltage +/-12Vdc  (note: this module uses two power supply connectors for load sharing)
• Supply current  J1: +68mA / -68mA, J2: +12/-26mA
• Panel width: 4U
• Waveform levels +/-5V
• Main PCB dimensions 175.26 x 188.51mm
• VCO frequency range without applied CV 20Hz to 13.6kHz
• LFO frequency range 0.037Hz to 17Hz
• Gate frequency range 0.038Hz to 9Hz

Kit contents

Each kit contains

• Main PCB
• Jack socket PCB
• All electronics components, IC sockets and power socket
• Pair of 100mm long Power leads
• Potentiometers, knobs, switches and jack sockets
• Front panel assembly (faceplate and 3mm aluminium back panel)
• Fixings