About the Sinulator
The Sinulator is a Eurorack module based on our SineCore Modulator, built in collaboration with West Oakland Music Systems (WOMS). It is an improved version of the SineCore Modulator with +/-1080 degrees of modulation before distortion. There is also an integrated VCA and offset/gain knobs for both the VCA and modulator. The Sinulator can be used as a sine wave shaper, converting either a ramp wave or sawtooth wave into an extremely low distortion sine wave. It can also be used as a wavefolder with up to 6 folds in either polarity, controllable by the VCA CV. Finally, it can be used as an FM modulator with through-zero capability.
How to use the Sinulator
As with all Open Music Labs projects, we encourage tinkering with electronics. The Sinulator has a few patch points that can be used to extend its range.
- Linear output VCA - The final output of the Sinulator can be amplitude modulated with an external CV. This can be done either linearly or exponentially. For linear control, cut the trace between the 2 pads of J2, and apply a 0V to 5V signal to pin2 of J2 (the round pad). if you want 0V to 10V control, add a 36k resistor in series with your input CV. Use an input jack that is normalled to +5V, so that the output enabled when no signal is present.
- Exponential output VCA - For exponential CV control, cut the trace between the 2 pads of J7, and place a 1k resistor between those 2 pads. Next, connect a 47k resistor from pin1 of J7 (the square pad) to your CV input. Finally, cut the trace between the 2 pads of J2 and place a 1M resistor between these 2 pads. This will allow a -5V to +5V signal to set the output from -60dB to full open.
- Wider offset range - the phase offset knob controls the output over +/-180 degrees. To increase this range over the full +/-1080 degrees, and into the distortion region, place a blob of solder on J8 such that both pads are now connected.
C14 moved from ground to negative voltage rail to improve noise immunity on the LM13700 current source.