Sputnik Modular - Variable Waveform Generator [VWG Eurorack Modular VCO Oscillator]

The Sputnik Variable Waveform Generator is a Buchla inspired discrete triangle core oscillator. One major change is the inclusion of a hard sync vs. the typical triangle core soft sync. The module features 5 dedicated audio outputs (sub, pulse, sine, saw and triangle) and various animation controls such as built-in waveshaper, saw animator and drive circuits with attenuation amount inputs. It also has a vco/lfo switch, both linear and exponential FM inputs with attenuators and very good tracking.

Sine:

Slider controls the level of wave-folding. Outputs a standard sine wave when slider is down, full effect when all the way up.

SYM: 98-99% symmetrical wave folding.

ASYM: Increased asymmetrical wave folding as the effect level is increased.

Sine Wave Fold CV:

Positive CV increases the effect.

Negative CV will duck the sine in a very exponential manner when the slider is low. Audio rate ducking produces a pseudo ring modulation effect.

The slider behaves as an offset for CV and an attenuator is provided.

Sawtooth:

Slider controls the position of additional saw waves for an animation

effect.

Double: a double sawtooth wave. Max levels can exceed 16Vpp.

Center Position: no animation, just sawtooth.

Triple: a triple sawtooth wave. Max levels can exceed 19Vpp.

Sawtooth Animate CV:

Slider behaves as an offset; any CV level can be used. CV attenuator

provided.

Triangle:

Slider controls the overdrive. Outputs standard Triangle when the slider

is down, full effect when all the way up.

ODD: typical soft saturation overdrive on top and bottom peaks.

EVEN: an asymmetrical soft saturation overdrive– increases width and

drive of the top side while decreasing the width and overdriving the

lower substantially less, producing more even harmonics.

Triangle Drive CV:

Positive CV increases the effect.

Negative CV will duck the Triangle in a very exponential manner when the

slider is low. Audio rate ducking produces a pseudo ring modulation effect.

The slider behaves as an offset for CV and an attenuator is provided.

Pulse:

Slider controls the pulse width. Center position produces a 50/50 pulse.

EDGE: standard PWM between upper and lower wave cycles. Approximately

10/90% duty cycle with slider.

CENTER: PWM between rising and falling edges of the pulse. Approximately

10/90% duty cycle with slider.

PWM CV:

EDGE: positive CV increases top side duty, Negative CV increases bottom

side duty.

CENTER: positive and Negative CV have same effect on top and bottom side

duty reduction.

Higher CV levels or CV + slider offset can increase/decrease the duty

cycle to 100/0% for a gated VCA effect.

SUB: -1 or -2 octave pulse.

VCO/LFO mode

Linear FM: AC coupled with attenuator.

Exponential FM: DC coupled with attenuator.

V/OCT tracking FM.

Coarse and fine tune controls.

SYNC: Hard Sync, works with any waveform for varied effects.

The Variable Waveform Generator is 18 HP.