SVF12

Maker	Fihdi
Type	12dB per octave voltage controlled state variable filter
Mounting	Mixed
Width	8 HP
License	Proprietary (CC-BY-NC-4.0, noncommercial so not an open licence)
Difficulty	🔥 SMD (0805)

Lowpass, bandpass, notch and highpass outputs with a ping input for damped ringing. A switch flips the core into a tracking sine-cosine quadrature oscillator. Runs internally on plus and minus 9V to steady the V/oct tracking. Three board design: an A-board, a B-board carrying the 1206 chip parts and an F-board front panel. The published gerbers and pick-and-place files let a fab assemble the surface mount side.

Documentation

• Bill of materials (BOM)
• Schematic
• Fabrication files (PCBA-ready)

Links

• Source / files on GitHub
• Maker page

More from Fihdi

UNO Voltage controlled oscillator and LFO with sync, PWM and sub BIPO Dual bipolar VCA and ring modulator with lock and mix DICE Sample and hold, white noise and comparator random source SCULPT ADSR envelope with CV over sustain and release, plus loop mode VCAR Voltage controlled attack release envelope and slew limiter MIDINT 8 channel MIDI to CV, gate and trigger interface with expanders MiniDrumkit Three channel WAV player with analog kick and hi-hat 16 Step Sequencer 16 step CV sequencer with four programmable gate channels

More filter modules

Ripples Mutable Instruments Blades Mutable Instruments Shelves Mutable Instruments V2044 VCF HAGIWO 3320 VCF diysynth Passive Low Pass Gate diysynth Kra Pao Voxmachina SVFs Super Synthesis

This is a third-party open-source design, listed here as a build reference. Specs are researched from public sources; check the source repo and store for the current BOM, panel, and revision before ordering parts. Corrections welcome.

← Back to all builds Resources Suggest a correction or a missing module