The original Russian ICs K140UD12 are used in the sound circuit. We did several updates to adapt the VCF for contemporary modular synth demands, it has independently buffered inputs, extended Cutoff knob, eliminated clicks when switching filter modes and output stage added to eliminate signal inversion. The result is a much punchier bass sound and very smooth controls.

Technical specifications:

Input level - up to 20Vptp

CV input level - -10V - +10V

Filter modes - BP(6dB/oct)/LP(12dB/oct)

Power consumption - +11mA, -11mA

Module width - 10 HP

Module depth - 25mm

More information - Erica Synths