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Sawtooth VCO


My latest and greatest VCO implementation based on the Electronotes ENS-76, opt 1 design.
It features standard 1 volt per octave exponential control, linear frequency control (FM), hard and soft sync, simultaneous sawtooth, rectangle, triangle and sine outputs. Pulse width on the rectangle output is variable from 0% to 100% and is voltage controllable (PWM) -5V(0%) to +5V(100%).

Control voltage summer and exponential converter schematic: (Click image for a bigger view)
Adder/Expo Schematic

Voltage References schematic: (Click image for a bigger view)
Voltage References Schematic

Current controlled sawtooth oscillator schematic: (Click image for a bigger view)
CCO Schematic

Wave-shaping circuits schematic: (Click image for a bigger view)
Wave Shapers Schematic

Triangle to sine converter schematic: (Click image for a bigger view)
Tri to Sine Schematic

Schematics created using Ray Wilson's (May he rest in peace) Schematic Publisher. The link to it on Music From Outer Space is no longer available.

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Last updated: Aug 31, 2016