Sinulator
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
Modifications
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.
- 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.
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 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.
Documentation V1
Documentation V1.1
C14 moved from ground to negative voltage rail to improve noise immunity on the LM13700 current source.
