Voltage controlled oscillator design

12 voltage controlled oscillators built into a single panel, with 3 sets of common manual controls controlling the parameters of 4 oscillators each. Each oscillator can be individually controlled by the control voltage inputs.

Common controls where chosen to save as much space as possible enabling all 12 VCOs to fit into a 2U panel. This also allows for manual transposition of 4 oscillators simultaneously, allowing easy adjustment of tones where multiple oscillators separated in frequency by the control voltage inputs, contribute to a single voice.

Inputs for each oscillator are:

• 3x 1V/Oct logarithmic frequency control (CV1, CV2, CV3) 
• Linear frequency control (LIN)
• Hard sync (SYNC)
• Pulse width control for SQR output (PWM)

Ouputs for each oscillator are:

• Square (SQR)
• Ramp (RMP)
• Triangle (TRI)
• Sine (SIN)

Common manual controls for each set of 4 oscillators:

• Coarse frequency adjust
• Fine frequency adjust
• Pulse width 

The oscillator circuit is based on the Music From Outer Space VCO. The only additions to this is the control voltage distributers necessary for the common controls.

Front panel layout: