Ripples
User manual
OVERVIEW
Ripples is a voltage-controlled filter. It provides 3 output modes: 2-pole band-pass, 2-pole low-pass and 4-
pole low-pass. The filtering is achieved by a high-quality quad VCA. An OTA in the filter feedback path brings
the resonance under voltage control, and also serves as a soft-limiter to ensure a clean self oscillation.
Finally, a VCA allows the level of the 4-pole low-pass output to be modulated by a CV. This makes Ripples a
good “final stage” module for a subtractive synthesis patch.
The tonal character of the filter is inspired by japanese classics from the 80s.
INSTALLATION
Ripples is designed for Eurorack synthesizer systems and occupies 8 HP of space. It requires a +/- 12V
power supply, consuming 35mA from each supply rail. The red stripe of the ribbon cable must be oriented on
the same side as the “Red stripe” marking on the printed circuit board.
CONTROLS
A. Resonance level. Self-oscillation occurs at about 80% of the course of this potentiometer.
B. Cutoff frequency.
C. Frequency modulation attenuverter. Adjusts the amount and polarity of frequency modulation from the
FM input.
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